/*
  ==============================================================================

   This file is part of the JUCE framework.
   Copyright (c) Raw Material Software Limited

   JUCE is an open source framework subject to commercial or open source
   licensing.

   By downloading, installing, or using the JUCE framework, or combining the
   JUCE framework with any other source code, object code, content or any other
   copyrightable work, you agree to the terms of the JUCE End User Licence
   Agreement, and all incorporated terms including the JUCE Privacy Policy and
   the JUCE Website Terms of Service, as applicable, which will bind you. If you
   do not agree to the terms of these agreements, we will not license the JUCE
   framework to you, and you must discontinue the installation or download
   process and cease use of the JUCE framework.

   JUCE End User Licence Agreement: https://juce.com/legal/juce-8-licence/
   JUCE Privacy Policy: https://juce.com/juce-privacy-policy
   JUCE Website Terms of Service: https://juce.com/juce-website-terms-of-service/

   Or:

   You may also use this code under the terms of the AGPLv3:
   https://www.gnu.org/licenses/agpl-3.0.en.html

   THE JUCE FRAMEWORK IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL
   WARRANTIES, WHETHER EXPRESSED OR IMPLIED, INCLUDING WARRANTY OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, ARE DISCLAIMED.

  ==============================================================================
*/

namespace juce
{
    struct GraphicsFontHelpers
    {
        static auto compareFont (const Font& a, const Font& b) { return Font::compare (a, b); }
    };
}

namespace juce::RenderingHelpers
{

JUCE_BEGIN_IGNORE_WARNINGS_MSVC (4127)

//==============================================================================
/** Holds either a simple integer translation, or an affine transform.

    @tags{Graphics}
*/
class TranslationOrTransform
{
public:
    TranslationOrTransform() = default;
    TranslationOrTransform (Point<int> origin) noexcept  : offset (origin) {}

    TranslationOrTransform (const TranslationOrTransform& other) = default;

    AffineTransform getTransform() const noexcept
    {
        return isOnlyTranslated ? AffineTransform::translation (offset)
                                : complexTransform;
    }

    AffineTransform getTransformWith (const AffineTransform& userTransform) const noexcept
    {
        return isOnlyTranslated ? userTransform.translated (offset)
                                : userTransform.followedBy (complexTransform);
    }

    bool isIdentity() const noexcept
    {
        return isOnlyTranslated && offset.isOrigin();
    }

    void setOrigin (Point<int> delta) noexcept
    {
        if (isOnlyTranslated)
            offset += delta;
        else
            complexTransform = AffineTransform::translation (delta)
                                               .followedBy (complexTransform);
    }

    void addTransform (const AffineTransform& t) noexcept
    {
        if (isOnlyTranslated && t.isOnlyTranslation())
        {
            auto tx = (int) (t.getTranslationX() * 256.0f);
            auto ty = (int) (t.getTranslationY() * 256.0f);

            if (((tx | ty) & 0xf8) == 0)
            {
                offset += Point<int> (tx >> 8, ty >> 8);
                return;
            }
        }

        complexTransform = getTransformWith (t);
        isOnlyTranslated = false;
        isRotated = (! approximatelyEqual (complexTransform.mat01, 0.0f)
                     || ! approximatelyEqual (complexTransform.mat10, 0.0f)
                     || complexTransform.mat00 < 0
                     || complexTransform.mat11 < 0);
    }

    float getPhysicalPixelScaleFactor() const noexcept
    {
        return isOnlyTranslated ? 1.0f : std::sqrt (std::abs (complexTransform.getDeterminant()));
    }

    void moveOriginInDeviceSpace (Point<int> delta) noexcept
    {
        if (isOnlyTranslated)
            offset += delta;
        else
            complexTransform = complexTransform.translated (delta);
    }

    Rectangle<int> translated (Rectangle<int> r) const noexcept
    {
        jassert (isOnlyTranslated);
        return r + offset;
    }

    Rectangle<float> translated (Rectangle<float> r) const noexcept
    {
        jassert (isOnlyTranslated);
        return r + offset.toFloat();
    }

    auto boundsAfterTransform (Rectangle<float> r) const noexcept
    {
        jassert (! isOnlyTranslated);
        return r.transformedBy (complexTransform);
    }

    template <typename RectangleOrPoint>
    auto transformed (RectangleOrPoint r) const noexcept
    {
        jassert (! isOnlyTranslated);
        return r.transformedBy (complexTransform);
    }

    auto boundsAfterTransform (const RectangleList<float>& r) const noexcept
    {
        jassert (! isOnlyTranslated);
        return boundsAfterTransform (r.getBounds());
    }

    auto boundsAfterTransform (Line<float> r) const noexcept
    {
        jassert (! isOnlyTranslated);
        return Line { transformed (r.getStart()), transformed (r.getEnd()) };
    }

    template <typename Type>
    Rectangle<float> deviceSpaceToUserSpace (Rectangle<Type> r) const noexcept
    {
        return isOnlyTranslated ? r.toFloat() - offset.toFloat()
                                : r.toFloat().transformedBy (complexTransform.inverted());
    }

    AffineTransform complexTransform;
    Point<int> offset;
    bool isOnlyTranslated = true, isRotated = false;
};

//==============================================================================
/** Holds a cache of recently-used glyph objects of some type.

    @tags{Graphics}
*/
class GlyphCache  : private DeletedAtShutdown
{
public:
    GlyphCache() = default;

    ~GlyphCache() override
    {
        getSingletonPointer() = nullptr;
    }

    static GlyphCache& getInstance()
    {
        auto& g = getSingletonPointer();

        if (g == nullptr)
            g = new GlyphCache();

        return *g;
    }

    //==============================================================================
    void reset()
    {
        cache.clear();
    }

    const auto& get (const Font& font, const int glyphNumber)
    {
        return cache.get (Key { font, glyphNumber }, [] (const auto& key)
        {
            auto fontHeight = detail::FontRendering::getEffectiveHeight (key.font);
            auto typeface = key.font.getTypefacePtr();
            return typeface->getLayersForGlyph (key.font.getMetricsKind(),
                                                key.glyph,
                                                AffineTransform::scale (fontHeight * key.font.getHorizontalScale(),
                                                                        fontHeight));
        });
    }

private:
    struct Key
    {
        Font font;
        int glyph;

        bool operator< (const Key& other) const
        {
            if (glyph < other.glyph)
                return true;

            if (other.glyph < glyph)
                return false;

            return GraphicsFontHelpers::compareFont (font, other.font);
        }
    };

    LruCache<Key, std::vector<GlyphLayer>> cache;

    static GlyphCache*& getSingletonPointer() noexcept
    {
        static GlyphCache* g = nullptr;
        return g;
    }

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (GlyphCache)
};

//==============================================================================
/** Calculates the alpha values and positions for rendering the edges of a
    non-pixel-aligned rectangle.

    @tags{Graphics}
*/
struct FloatRectangleRasterisingInfo
{
    FloatRectangleRasterisingInfo (Rectangle<float> area)
        : left   (roundToInt (256.0f * area.getX())),
          top    (roundToInt (256.0f * area.getY())),
          right  (roundToInt (256.0f * area.getRight())),
          bottom (roundToInt (256.0f * area.getBottom()))
    {
        if ((top >> 8) == (bottom >> 8))
        {
            topAlpha = bottom - top;
            bottomAlpha = 0;
            totalTop = top >> 8;
            totalBottom = bottom = top = totalTop + 1;
        }
        else
        {
            if ((top & 255) == 0)
            {
                topAlpha = 0;
                top = totalTop = (top >> 8);
            }
            else
            {
                topAlpha = 255 - (top & 255);
                totalTop = (top >> 8);
                top = totalTop + 1;
            }

            bottomAlpha = bottom & 255;
            bottom >>= 8;
            totalBottom = bottom + (bottomAlpha != 0 ? 1 : 0);
        }

        if ((left >> 8) == (right >> 8))
        {
            leftAlpha = right - left;
            rightAlpha = 0;
            totalLeft = (left >> 8);
            totalRight = right = left = totalLeft + 1;
        }
        else
        {
            if ((left & 255) == 0)
            {
                leftAlpha = 0;
                left = totalLeft = (left >> 8);
            }
            else
            {
                leftAlpha = 255 - (left & 255);
                totalLeft = (left >> 8);
                left = totalLeft + 1;
            }

            rightAlpha = right & 255;
            right >>= 8;
            totalRight = right + (rightAlpha != 0 ? 1 : 0);
        }
    }

    template <class Callback>
    void iterate (Callback& callback) const
    {
        if (topAlpha != 0)       callback (totalLeft, totalTop, totalRight - totalLeft, 1, topAlpha);
        if (bottomAlpha != 0)    callback (totalLeft, bottom,   totalRight - totalLeft, 1, bottomAlpha);
        if (leftAlpha != 0)      callback (totalLeft, totalTop, 1, totalBottom - totalTop, leftAlpha);
        if (rightAlpha != 0)     callback (right,     totalTop, 1, totalBottom - totalTop, rightAlpha);

        callback (left, top, right - left, bottom - top, 255);
    }

    inline bool isOnePixelWide() const noexcept            { return right - left == 1 && leftAlpha + rightAlpha == 0; }

    inline int getTopLeftCornerAlpha() const noexcept      { return (topAlpha * leftAlpha) >> 8; }
    inline int getTopRightCornerAlpha() const noexcept     { return (topAlpha * rightAlpha) >> 8; }
    inline int getBottomLeftCornerAlpha() const noexcept   { return (bottomAlpha * leftAlpha) >> 8; }
    inline int getBottomRightCornerAlpha() const noexcept  { return (bottomAlpha * rightAlpha) >> 8; }

    //==============================================================================
    int left, top, right, bottom;  // bounds of the solid central area, excluding anti-aliased edges
    int totalTop, totalLeft, totalBottom, totalRight; // bounds of the total area, including edges
    int topAlpha, leftAlpha, bottomAlpha, rightAlpha; // alpha of each anti-aliased edge
};

// Line::findNearestPointTo will always return a point between the line's start and end, whereas
// this version assumes that the line is infinite.
static Point<float> closestPointOnInfiniteLine (const Line<float>& line, const Point<float>& point)
{
    const Line perpendicularThroughPoint { point, point + line.getPointAlongLine (0.0f, 1.0f) - line.getStart() };
    return line.getIntersection (perpendicularThroughPoint);
}

//==============================================================================
/** Contains classes for calculating the colour of pixels within various types of gradient. */
namespace GradientPixelIterators
{
    /** Iterates the colour of pixels in a linear gradient */
    struct Linear
    {
        Linear (const ColourGradient& gradient, const AffineTransform& transform,
                const PixelARGB* colours, int numColours)
            : lookupTable (colours),
              numEntries (numColours)
        {
            jassert (numColours >= 0);
            auto p1 = gradient.point1;
            auto p2 = gradient.point2;

            if (! transform.isIdentity())
            {
                auto p3 = Line<float> (p2, p1).getPointAlongLine (0.0f, 100.0f);

                p1.applyTransform (transform);
                p2.applyTransform (transform);
                p3.applyTransform (transform);

                p2 = closestPointOnInfiniteLine ({ p2, p3 }, p1);
            }

            vertical   = std::abs (p1.x - p2.x) < 0.001f;
            horizontal = std::abs (p1.y - p2.y) < 0.001f;

            if (vertical)
            {
                scale = roundToInt ((double) ((int64_t) numEntries << (int) numScaleBits) / (double) (p2.y - p1.y));
                start = roundToInt (p1.y * (float) scale);
            }
            else if (horizontal)
            {
                scale = roundToInt ((double) ((int64_t) numEntries << (int) numScaleBits) / (double) (p2.x - p1.x));
                start = roundToInt (p1.x * (float) scale);
            }
            else
            {
                grad = (p2.y - p1.y) / (double) (p1.x - p2.x);
                yTerm = p1.y - (p1.x / grad);
                scale = roundToInt ((double) ((int64_t) numEntries << (int) numScaleBits) / (yTerm * grad - (p2.y * grad - p2.x)));
                grad *= scale;
            }
        }

        forcedinline void setY (int y) noexcept
        {
            if (vertical)
                linePix = lookupTable[jlimit (0, numEntries, (y * scale - start) >> (int) numScaleBits)];
            else if (! horizontal)
                start = roundToInt ((y - yTerm) * grad);
        }

        inline PixelARGB getPixel (int x) const noexcept
        {
            return vertical ? linePix
                            : lookupTable[jlimit (0, numEntries, (x * scale - start) >> (int) numScaleBits)];
        }

        const PixelARGB* const lookupTable;
        const int numEntries;
        PixelARGB linePix;
        int start, scale;
        double grad, yTerm;
        bool vertical, horizontal;
        enum { numScaleBits = 12 };

        JUCE_DECLARE_NON_COPYABLE (Linear)
    };

    //==============================================================================
    /** Iterates the colour of pixels in a circular radial gradient */
    struct Radial
    {
        Radial (const ColourGradient& gradient, const AffineTransform&,
                const PixelARGB* colours, int numColours)
            : lookupTable (colours),
              numEntries (numColours),
              gx1 (gradient.point1.x),
              gy1 (gradient.point1.y)
        {
            jassert (numColours >= 0);
            auto diff = gradient.point1 - gradient.point2;
            maxDist = diff.x * diff.x + diff.y * diff.y;
            invScale = numEntries / std::sqrt (maxDist);
            jassert (roundToInt (std::sqrt (maxDist) * invScale) <= numEntries);
        }

        forcedinline void setY (int y) noexcept
        {
            dy = y - gy1;
            dy *= dy;
        }

        inline PixelARGB getPixel (int px) const noexcept
        {
            auto x = px - gx1;
            x *= x;
            x += dy;

            return lookupTable[x >= maxDist ? numEntries : roundToInt (std::sqrt (x) * invScale)];
        }

        const PixelARGB* const lookupTable;
        const int numEntries;
        const double gx1, gy1;
        double maxDist, invScale, dy;

        JUCE_DECLARE_NON_COPYABLE (Radial)
    };

    //==============================================================================
    /** Iterates the colour of pixels in a skewed radial gradient */
    struct TransformedRadial   : public Radial
    {
        TransformedRadial (const ColourGradient& gradient, const AffineTransform& transform,
                           const PixelARGB* colours, int numColours)
            : Radial (gradient, transform, colours, numColours),
              inverseTransform (transform.inverted())
        {
            tM10 = inverseTransform.mat10;
            tM00 = inverseTransform.mat00;
        }

        forcedinline void setY (int y) noexcept
        {
            auto floatY = (float) y;
            lineYM01 = inverseTransform.mat01 * floatY + inverseTransform.mat02 - gx1;
            lineYM11 = inverseTransform.mat11 * floatY + inverseTransform.mat12 - gy1;
        }

        inline PixelARGB getPixel (int px) const noexcept
        {
            double x = px;
            auto y = tM10 * x + lineYM11;
            x = tM00 * x + lineYM01;
            x *= x;
            x += y * y;

            if (x >= maxDist)
                return lookupTable[numEntries];

            return lookupTable[jmin (numEntries, roundToInt (std::sqrt (x) * invScale))];
        }

    private:
        double tM10, tM00, lineYM01, lineYM11;
        const AffineTransform inverseTransform;

        JUCE_DECLARE_NON_COPYABLE (TransformedRadial)
    };
}

#define JUCE_PERFORM_PIXEL_OP_LOOP(op) \
{ \
    const int destStride = destData.pixelStride;  \
    do { dest->op; dest = addBytesToPointer (dest, destStride); } while (--width > 0); \
}

//==============================================================================
/** Contains classes for filling edge tables with various fill types. */
namespace EdgeTableFillers
{
    /** Fills an edge-table with a solid colour. */
    template <class PixelType, bool replaceExisting = false>
    struct SolidColour
    {
        SolidColour (const Image::BitmapData& image, PixelARGB colour)
            : destData (image), sourceColour (colour)
        {
            if (sizeof (PixelType) == 3 && (size_t) destData.pixelStride == sizeof (PixelType))
                areRGBComponentsEqual = sourceColour.getRed() == sourceColour.getGreen()
                                            && sourceColour.getGreen() == sourceColour.getBlue();
            else
                areRGBComponentsEqual = false;
        }

        forcedinline void setEdgeTableYPos (int y) noexcept
        {
            linePixels = (PixelType*) destData.getLinePointer (y);
        }

        forcedinline void handleEdgeTablePixel (int x, int alphaLevel) const noexcept
        {
            if (replaceExisting)
                getPixel (x)->set (sourceColour);
            else
                getPixel (x)->blend (sourceColour, (uint32) alphaLevel);
        }

        forcedinline void handleEdgeTablePixelFull (int x) const noexcept
        {
            if (replaceExisting)
                getPixel (x)->set (sourceColour);
            else
                getPixel (x)->blend (sourceColour);
        }

        forcedinline void handleEdgeTableLine (int x, int width, int alphaLevel) const noexcept
        {
            auto p = sourceColour;
            p.multiplyAlpha (alphaLevel);

            auto* dest = getPixel (x);

            if (replaceExisting || p.getAlpha() >= 0xff)
                replaceLine (dest, p, width);
            else
                blendLine (dest, p, width);
        }

        forcedinline void handleEdgeTableLineFull (int x, int width) const noexcept
        {
            auto* dest = getPixel (x);

            if (replaceExisting || sourceColour.getAlpha() >= 0xff)
                replaceLine (dest, sourceColour, width);
            else
                blendLine (dest, sourceColour, width);
        }

        void handleEdgeTableRectangle (int x, int y, int width, int height, int alphaLevel) noexcept
        {
            auto p = sourceColour;
            p.multiplyAlpha (alphaLevel);

            setEdgeTableYPos (y);
            auto* dest = getPixel (x);

            if (replaceExisting || p.getAlpha() >= 0xff)
            {
                while (--height >= 0)
                {
                    replaceLine (dest, p, width);
                    dest = addBytesToPointer (dest, destData.lineStride);
                }
            }
            else
            {
                while (--height >= 0)
                {
                    blendLine (dest, p, width);
                    dest = addBytesToPointer (dest, destData.lineStride);
                }
            }
        }

        void handleEdgeTableRectangleFull (int x, int y, int width, int height) noexcept
        {
            handleEdgeTableRectangle (x, y, width, height, 255);
        }

    private:
        const Image::BitmapData& destData;
        PixelType* linePixels;
        PixelARGB sourceColour;
        bool areRGBComponentsEqual;

        forcedinline PixelType* getPixel (int x) const noexcept
        {
            return addBytesToPointer (linePixels, x * destData.pixelStride);
        }

        inline void blendLine (PixelType* dest, PixelARGB colour, int width) const noexcept
        {
            JUCE_PERFORM_PIXEL_OP_LOOP (blend (colour))
        }

        forcedinline void replaceLine (PixelRGB* dest, PixelARGB colour, int width) const noexcept
        {
            if ((size_t) destData.pixelStride == sizeof (*dest) && areRGBComponentsEqual)
                memset ((void*) dest, colour.getRed(), (size_t) width * 3);   // if all the component values are the same, we can cheat
            else
                JUCE_PERFORM_PIXEL_OP_LOOP (set (colour));
        }

        forcedinline void replaceLine (PixelAlpha* dest, const PixelARGB colour, int width) const noexcept
        {
            if ((size_t) destData.pixelStride == sizeof (*dest))
                memset ((void*) dest, colour.getAlpha(), (size_t) width);
            else
                JUCE_PERFORM_PIXEL_OP_LOOP (setAlpha (colour.getAlpha()))
        }

        forcedinline void replaceLine (PixelARGB* dest, const PixelARGB colour, int width) const noexcept
        {
            JUCE_PERFORM_PIXEL_OP_LOOP (set (colour))
        }

        JUCE_DECLARE_NON_COPYABLE (SolidColour)
    };

    //==============================================================================
    /** Fills an edge-table with a gradient. */
    template <class PixelType, class GradientType>
    struct Gradient  : public GradientType
    {
        Gradient (const Image::BitmapData& dest, const ColourGradient& gradient, const AffineTransform& transform,
                  const PixelARGB* colours, int numColours)
            : GradientType (gradient, transform, colours, numColours - 1),
              destData (dest)
        {
        }

        forcedinline void setEdgeTableYPos (int y) noexcept
        {
            linePixels = (PixelType*) destData.getLinePointer (y);
            GradientType::setY (y);
        }

        forcedinline void handleEdgeTablePixel (int x, int alphaLevel) const noexcept
        {
            getPixel (x)->blend (GradientType::getPixel (x), (uint32) alphaLevel);
        }

        forcedinline void handleEdgeTablePixelFull (int x) const noexcept
        {
            getPixel (x)->blend (GradientType::getPixel (x));
        }

        void handleEdgeTableLine (int x, int width, int alphaLevel) const noexcept
        {
            auto* dest = getPixel (x);

            if (alphaLevel < 0xff)
                JUCE_PERFORM_PIXEL_OP_LOOP (blend (GradientType::getPixel (x++), (uint32) alphaLevel))
            else
                JUCE_PERFORM_PIXEL_OP_LOOP (blend (GradientType::getPixel (x++)))
        }

        void handleEdgeTableLineFull (int x, int width) const noexcept
        {
            auto* dest = getPixel (x);
            JUCE_PERFORM_PIXEL_OP_LOOP (blend (GradientType::getPixel (x++)))
        }

        void handleEdgeTableRectangle (int x, int y, int width, int height, int alphaLevel) noexcept
        {
            while (--height >= 0)
            {
                setEdgeTableYPos (y++);
                handleEdgeTableLine (x, width, alphaLevel);
            }
        }

        void handleEdgeTableRectangleFull (int x, int y, int width, int height) noexcept
        {
            while (--height >= 0)
            {
                setEdgeTableYPos (y++);
                handleEdgeTableLineFull (x, width);
            }
        }

    private:
        const Image::BitmapData& destData;
        PixelType* linePixels;

        forcedinline PixelType* getPixel (int x) const noexcept
        {
            return addBytesToPointer (linePixels, x * destData.pixelStride);
        }

        JUCE_DECLARE_NON_COPYABLE (Gradient)
    };

    //==============================================================================
    /** Fills an edge-table with a non-transformed image. */
    template <class DestPixelType, class SrcPixelType, bool repeatPattern>
    struct ImageFill
    {
        ImageFill (const Image::BitmapData& dest, const Image::BitmapData& src, int alpha, int x, int y)
            : destData (dest),
              srcData (src),
              extraAlpha (alpha + 1),
              xOffset (repeatPattern ? negativeAwareModulo (x, src.width)  - src.width  : x),
              yOffset (repeatPattern ? negativeAwareModulo (y, src.height) - src.height : y)
        {
        }

        forcedinline void setEdgeTableYPos (int y) noexcept
        {
            linePixels = (DestPixelType*) destData.getLinePointer (y);
            y -= yOffset;

            if (repeatPattern)
            {
                jassert (y >= 0);
                y %= srcData.height;
            }

            sourceLineStart = (SrcPixelType*) srcData.getLinePointer (y);
        }

        forcedinline void handleEdgeTablePixel (int x, int alphaLevel) const noexcept
        {
            alphaLevel = (alphaLevel * extraAlpha) >> 8;

            getDestPixel (x)->blend (*getSrcPixel (repeatPattern ? ((x - xOffset) % srcData.width) : (x - xOffset)), (uint32) alphaLevel);
        }

        forcedinline void handleEdgeTablePixelFull (int x) const noexcept
        {
            getDestPixel (x)->blend (*getSrcPixel (repeatPattern ? ((x - xOffset) % srcData.width) : (x - xOffset)), (uint32) extraAlpha);
        }

        void handleEdgeTableLine (int x, int width, int alphaLevel) const noexcept
        {
            auto* dest = getDestPixel (x);
            alphaLevel = (alphaLevel * extraAlpha) >> 8;
            x -= xOffset;

            if (repeatPattern)
            {
                if (alphaLevel < 0xfe)
                    JUCE_PERFORM_PIXEL_OP_LOOP (blend (*getSrcPixel (x++ % srcData.width), (uint32) alphaLevel))
                else
                    JUCE_PERFORM_PIXEL_OP_LOOP (blend (*getSrcPixel (x++ % srcData.width)))
            }
            else
            {
                jassert (x >= 0 && x + width <= srcData.width);

                if (alphaLevel < 0xfe)
                    JUCE_PERFORM_PIXEL_OP_LOOP (blend (*getSrcPixel (x++), (uint32) alphaLevel))
                else
                    copyRow (dest, getSrcPixel (x), width);
            }
        }

        void handleEdgeTableLineFull (int x, int width) const noexcept
        {
            auto* dest = getDestPixel (x);
            x -= xOffset;

            if (repeatPattern)
            {
                if (extraAlpha < 0xfe)
                    JUCE_PERFORM_PIXEL_OP_LOOP (blend (*getSrcPixel (x++ % srcData.width), (uint32) extraAlpha))
                else
                    JUCE_PERFORM_PIXEL_OP_LOOP (blend (*getSrcPixel (x++ % srcData.width)))
            }
            else
            {
                jassert (x >= 0 && x + width <= srcData.width);

                if (extraAlpha < 0xfe)
                    JUCE_PERFORM_PIXEL_OP_LOOP (blend (*getSrcPixel (x++), (uint32) extraAlpha))
                else
                    copyRow (dest, getSrcPixel (x), width);
            }
        }

        void handleEdgeTableRectangle (int x, int y, int width, int height, int alphaLevel) noexcept
        {
            while (--height >= 0)
            {
                setEdgeTableYPos (y++);
                handleEdgeTableLine (x, width, alphaLevel);
            }
        }

        void handleEdgeTableRectangleFull (int x, int y, int width, int height) noexcept
        {
            while (--height >= 0)
            {
                setEdgeTableYPos (y++);
                handleEdgeTableLineFull (x, width);
            }
        }

        void clipEdgeTableLine (EdgeTable& et, int x, int y, int width)
        {
            jassert (x - xOffset >= 0 && x + width - xOffset <= srcData.width);
            auto* s = (SrcPixelType*) srcData.getLinePointer (y - yOffset);
            auto* mask = (uint8*) (s + x - xOffset);

            if (sizeof (SrcPixelType) == sizeof (PixelARGB))
                mask += PixelARGB::indexA;

            et.clipLineToMask (x, y, mask, sizeof (SrcPixelType), width);
        }

    private:
        const Image::BitmapData& destData;
        const Image::BitmapData& srcData;
        const int extraAlpha, xOffset, yOffset;
        DestPixelType* linePixels;
        SrcPixelType* sourceLineStart;

        forcedinline DestPixelType* getDestPixel (int x) const noexcept
        {
            return addBytesToPointer (linePixels, x * destData.pixelStride);
        }

        forcedinline SrcPixelType const* getSrcPixel (int x) const noexcept
        {
            return addBytesToPointer (sourceLineStart, x * srcData.pixelStride);
        }

        forcedinline void copyRow (DestPixelType* dest, SrcPixelType const* src, int width) const noexcept
        {
            auto destStride = destData.pixelStride;
            auto srcStride  = srcData.pixelStride;

            if (destStride == srcStride
                 && srcData.pixelFormat  == Image::RGB
                 && destData.pixelFormat == Image::RGB)
            {
                memcpy ((void*) dest, src, (size_t) (width * srcStride));
            }
            else
            {
                do
                {
                    dest->blend (*src);
                    dest = addBytesToPointer (dest, destStride);
                    src  = addBytesToPointer (src, srcStride);
                } while (--width > 0);
            }
        }

        JUCE_DECLARE_NON_COPYABLE (ImageFill)
    };

    //==============================================================================
    /** Fills an edge-table with a transformed image. */
    template <class DestPixelType, class SrcPixelType, bool repeatPattern>
    struct TransformedImageFill
    {
        TransformedImageFill (const Image::BitmapData& dest, const Image::BitmapData& src,
                              const AffineTransform& transform, int alpha, Graphics::ResamplingQuality q)
            : interpolator (transform,
                            q != Graphics::lowResamplingQuality ? 0.5f : 0.0f,
                            q != Graphics::lowResamplingQuality ? -128 : 0),
              destData (dest),
              srcData (src),
              extraAlpha (alpha + 1),
              quality (q),
              maxX (src.width  - 1),
              maxY (src.height - 1)
        {
            scratchBuffer.malloc (scratchSize);
        }

        forcedinline void setEdgeTableYPos (int newY) noexcept
        {
            currentY = newY;
            linePixels = (DestPixelType*) destData.getLinePointer (newY);
        }

        forcedinline void handleEdgeTablePixel (int x, int alphaLevel) noexcept
        {
            SrcPixelType p;
            generate (&p, x, 1);

            getDestPixel (x)->blend (p, (uint32) (alphaLevel * extraAlpha) >> 8);
        }

        forcedinline void handleEdgeTablePixelFull (int x) noexcept
        {
            SrcPixelType p;
            generate (&p, x, 1);

            getDestPixel (x)->blend (p, (uint32) extraAlpha);
        }

        void handleEdgeTableLine (int x, int width, int alphaLevel) noexcept
        {
            if (width > (int) scratchSize)
            {
                scratchSize = (size_t) width;
                scratchBuffer.malloc (scratchSize);
            }

            SrcPixelType* span = scratchBuffer;
            generate (span, x, width);

            auto* dest = getDestPixel (x);
            alphaLevel *= extraAlpha;
            alphaLevel >>= 8;

            if (alphaLevel < 0xfe)
                JUCE_PERFORM_PIXEL_OP_LOOP (blend (*span++, (uint32) alphaLevel))
            else
                JUCE_PERFORM_PIXEL_OP_LOOP (blend (*span++))
        }

        forcedinline void handleEdgeTableLineFull (int x, int width) noexcept
        {
            handleEdgeTableLine (x, width, 255);
        }

        void handleEdgeTableRectangle (int x, int y, int width, int height, int alphaLevel) noexcept
        {
            while (--height >= 0)
            {
                setEdgeTableYPos (y++);
                handleEdgeTableLine (x, width, alphaLevel);
            }
        }

        void handleEdgeTableRectangleFull (int x, int y, int width, int height) noexcept
        {
            while (--height >= 0)
            {
                setEdgeTableYPos (y++);
                handleEdgeTableLineFull (x, width);
            }
        }

        void clipEdgeTableLine (EdgeTable& et, int x, int y, int width)
        {
            if (width > (int) scratchSize)
            {
                scratchSize = (size_t) width;
                scratchBuffer.malloc (scratchSize);
            }

            currentY = y;
            generate (scratchBuffer.get(), x, width);

            et.clipLineToMask (x, y,
                               reinterpret_cast<uint8*> (scratchBuffer.get()) + SrcPixelType::indexA,
                               sizeof (SrcPixelType), width);
        }

    private:
        forcedinline DestPixelType* getDestPixel (int x) const noexcept
        {
            return addBytesToPointer (linePixels, x * destData.pixelStride);
        }

        //==============================================================================
        template <class PixelType>
        void generate (PixelType* dest, int x, int numPixels) noexcept
        {
            this->interpolator.setStartOfLine ((float) x, (float) currentY, numPixels);

            do
            {
                int hiResX, hiResY;
                this->interpolator.next (hiResX, hiResY);

                int loResX = hiResX >> 8;
                int loResY = hiResY >> 8;

                if (repeatPattern)
                {
                    loResX = negativeAwareModulo (loResX, srcData.width);
                    loResY = negativeAwareModulo (loResY, srcData.height);
                }

                if (quality != Graphics::lowResamplingQuality)
                {
                    if (isPositiveAndBelow (loResX, maxX))
                    {
                        if (isPositiveAndBelow (loResY, maxY))
                        {
                            // in the centre of the image
                            render4PixelAverage (dest, this->srcData.getPixelPointer (loResX, loResY),
                                                 hiResX & 255, hiResY & 255);
                            ++dest;
                            continue;
                        }

                        if (! repeatPattern)
                        {
                            // at a top or bottom edge
                            if (loResY < 0)
                                render2PixelAverageX (dest, this->srcData.getPixelPointer (loResX, 0), hiResX & 255);
                            else
                                render2PixelAverageX (dest, this->srcData.getPixelPointer (loResX, maxY), hiResX & 255);

                            ++dest;
                            continue;
                        }
                    }
                    else
                    {
                        if (isPositiveAndBelow (loResY, maxY) && ! repeatPattern)
                        {
                            // at a left or right hand edge
                            if (loResX < 0)
                                render2PixelAverageY (dest, this->srcData.getPixelPointer (0, loResY), hiResY & 255);
                            else
                                render2PixelAverageY (dest, this->srcData.getPixelPointer (maxX, loResY), hiResY & 255);

                            ++dest;
                            continue;
                        }
                    }
                }

                if (! repeatPattern)
                {
                    if (loResX < 0)     loResX = 0;
                    if (loResY < 0)     loResY = 0;
                    if (loResX > maxX)  loResX = maxX;
                    if (loResY > maxY)  loResY = maxY;
                }

                dest->set (*(const PixelType*) this->srcData.getPixelPointer (loResX, loResY));
                ++dest;

            } while (--numPixels > 0);
        }

        //==============================================================================
        void render4PixelAverage (PixelARGB* dest, const uint8* src, int subPixelX, int subPixelY) noexcept
        {
            uint32 c[4] = { 256 * 128, 256 * 128, 256 * 128, 256 * 128 };

            auto weight = (uint32) ((256 - subPixelX) * (256 - subPixelY));
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];
            c[3] += weight * src[3];

            src += this->srcData.pixelStride;

            weight = (uint32) (subPixelX * (256 - subPixelY));
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];
            c[3] += weight * src[3];

            src += this->srcData.lineStride;

            weight = (uint32) (subPixelX * subPixelY);
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];
            c[3] += weight * src[3];

            src -= this->srcData.pixelStride;

            weight = (uint32) ((256 - subPixelX) * subPixelY);
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];
            c[3] += weight * src[3];

            dest->setARGB ((uint8) (c[PixelARGB::indexA] >> 16),
                           (uint8) (c[PixelARGB::indexR] >> 16),
                           (uint8) (c[PixelARGB::indexG] >> 16),
                           (uint8) (c[PixelARGB::indexB] >> 16));
        }

        void render2PixelAverageX (PixelARGB* dest, const uint8* src, uint32 subPixelX) noexcept
        {
            uint32 c[4] = { 128, 128, 128, 128 };

            uint32 weight = 256 - subPixelX;
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];
            c[3] += weight * src[3];

            src += this->srcData.pixelStride;

            weight = subPixelX;
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];
            c[3] += weight * src[3];

            dest->setARGB ((uint8) (c[PixelARGB::indexA] >> 8),
                           (uint8) (c[PixelARGB::indexR] >> 8),
                           (uint8) (c[PixelARGB::indexG] >> 8),
                           (uint8) (c[PixelARGB::indexB] >> 8));
        }

        void render2PixelAverageY (PixelARGB* dest, const uint8* src, uint32 subPixelY) noexcept
        {
            uint32 c[4] = { 128, 128, 128, 128 };

            uint32 weight = 256 - subPixelY;
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];
            c[3] += weight * src[3];

            src += this->srcData.lineStride;

            weight = subPixelY;
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];
            c[3] += weight * src[3];

            dest->setARGB ((uint8) (c[PixelARGB::indexA] >> 8),
                           (uint8) (c[PixelARGB::indexR] >> 8),
                           (uint8) (c[PixelARGB::indexG] >> 8),
                           (uint8) (c[PixelARGB::indexB] >> 8));
        }

        //==============================================================================
        void render4PixelAverage (PixelRGB* dest, const uint8* src, uint32 subPixelX, uint32 subPixelY) noexcept
        {
            uint32 c[3] = { 256 * 128, 256 * 128, 256 * 128 };

            uint32 weight = (256 - subPixelX) * (256 - subPixelY);
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];

            src += this->srcData.pixelStride;

            weight = subPixelX * (256 - subPixelY);
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];

            src += this->srcData.lineStride;

            weight = subPixelX * subPixelY;
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];

            src -= this->srcData.pixelStride;

            weight = (256 - subPixelX) * subPixelY;
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];

            dest->setARGB ((uint8) 255,
                           (uint8) (c[PixelRGB::indexR] >> 16),
                           (uint8) (c[PixelRGB::indexG] >> 16),
                           (uint8) (c[PixelRGB::indexB] >> 16));
        }

        void render2PixelAverageX (PixelRGB* dest, const uint8* src, uint32 subPixelX) noexcept
        {
            uint32 c[3] = { 128, 128, 128 };

            const uint32 weight = 256 - subPixelX;
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];

            src += this->srcData.pixelStride;

            c[0] += subPixelX * src[0];
            c[1] += subPixelX * src[1];
            c[2] += subPixelX * src[2];

            dest->setARGB ((uint8) 255,
                           (uint8) (c[PixelRGB::indexR] >> 8),
                           (uint8) (c[PixelRGB::indexG] >> 8),
                           (uint8) (c[PixelRGB::indexB] >> 8));
        }

        void render2PixelAverageY (PixelRGB* dest, const uint8* src, uint32 subPixelY) noexcept
        {
            uint32 c[3] = { 128, 128, 128 };

            const uint32 weight = 256 - subPixelY;
            c[0] += weight * src[0];
            c[1] += weight * src[1];
            c[2] += weight * src[2];

            src += this->srcData.lineStride;

            c[0] += subPixelY * src[0];
            c[1] += subPixelY * src[1];
            c[2] += subPixelY * src[2];

            dest->setARGB ((uint8) 255,
                           (uint8) (c[PixelRGB::indexR] >> 8),
                           (uint8) (c[PixelRGB::indexG] >> 8),
                           (uint8) (c[PixelRGB::indexB] >> 8));
        }

        //==============================================================================
        void render4PixelAverage (PixelAlpha* dest, const uint8* src, uint32 subPixelX, uint32 subPixelY) noexcept
        {
            uint32 c = 256 * 128;
            c += src[0] * ((256 - subPixelX) * (256 - subPixelY));
            src += this->srcData.pixelStride;
            c += src[0] * (subPixelX * (256 - subPixelY));
            src += this->srcData.lineStride;
            c += src[0] * (subPixelX * subPixelY);
            src -= this->srcData.pixelStride;

            c += src[0] * ((256 - subPixelX) * subPixelY);

            *((uint8*) dest) = (uint8) (c >> 16);
        }

        void render2PixelAverageX (PixelAlpha* dest, const uint8* src, uint32 subPixelX) noexcept
        {
            uint32 c = 128;
            c += src[0] * (256 - subPixelX);
            src += this->srcData.pixelStride;
            c += src[0] * subPixelX;
            *((uint8*) dest) = (uint8) (c >> 8);
        }

        void render2PixelAverageY (PixelAlpha* dest, const uint8* src, uint32 subPixelY) noexcept
        {
            uint32 c = 128;
            c += src[0] * (256 - subPixelY);
            src += this->srcData.lineStride;
            c += src[0] * subPixelY;
            *((uint8*) dest) = (uint8) (c >> 8);
        }

        //==============================================================================
        struct TransformedImageSpanInterpolator
        {
            TransformedImageSpanInterpolator (const AffineTransform& transform, float offsetFloat, int offsetInt) noexcept
                : inverseTransform (transform.inverted()),
                  pixelOffset (offsetFloat), pixelOffsetInt (offsetInt)
            {}

            void setStartOfLine (float sx, float sy, int numPixels) noexcept
            {
                jassert (numPixels > 0);

                sx += pixelOffset;
                sy += pixelOffset;
                auto x1 = sx, y1 = sy;
                sx += (float) numPixels;
                inverseTransform.transformPoints (x1, y1, sx, sy);

                xBresenham.set ((int) (x1 * 256.0f), (int) (sx * 256.0f), numPixels, pixelOffsetInt);
                yBresenham.set ((int) (y1 * 256.0f), (int) (sy * 256.0f), numPixels, pixelOffsetInt);
            }

            void next (int& px, int& py) noexcept
            {
                px = xBresenham.n;  xBresenham.stepToNext();
                py = yBresenham.n;  yBresenham.stepToNext();
            }

        private:
            struct BresenhamInterpolator
            {
                BresenhamInterpolator() = default;

                void set (int n1, int n2, int steps, int offsetInt) noexcept
                {
                    numSteps = steps;
                    step = (n2 - n1) / numSteps;
                    remainder = modulo = (n2 - n1) % numSteps;
                    n = n1 + offsetInt;

                    if (modulo <= 0)
                    {
                        modulo += numSteps;
                        remainder += numSteps;
                        --step;
                    }

                    modulo -= numSteps;
                }

                forcedinline void stepToNext() noexcept
                {
                    modulo += remainder;
                    n += step;

                    if (modulo > 0)
                    {
                        modulo -= numSteps;
                        ++n;
                    }
                }

                int n;

            private:
                int numSteps, step, modulo, remainder;
            };

            const AffineTransform inverseTransform;
            BresenhamInterpolator xBresenham, yBresenham;
            const float pixelOffset;
            const int pixelOffsetInt;

            JUCE_DECLARE_NON_COPYABLE (TransformedImageSpanInterpolator)
        };

        //==============================================================================
        TransformedImageSpanInterpolator interpolator;
        const Image::BitmapData& destData;
        const Image::BitmapData& srcData;
        const int extraAlpha;
        const Graphics::ResamplingQuality quality;
        const int maxX, maxY;
        int currentY;
        DestPixelType* linePixels;
        HeapBlock<SrcPixelType> scratchBuffer;
        size_t scratchSize = 2048;

        JUCE_DECLARE_NON_COPYABLE (TransformedImageFill)
    };


    //==============================================================================
    template <class Iterator>
    void renderImageTransformed (Iterator& iter, const Image::BitmapData& destData, const Image::BitmapData& srcData,
                                 int alpha, const AffineTransform& transform, Graphics::ResamplingQuality quality, bool tiledFill)
    {
        switch (destData.pixelFormat)
        {
        case Image::ARGB:
            switch (srcData.pixelFormat)
            {
            case Image::ARGB:
                if (tiledFill)  { TransformedImageFill<PixelARGB, PixelARGB, true>  r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                else            { TransformedImageFill<PixelARGB, PixelARGB, false> r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                break;
            case Image::RGB:
                if (tiledFill)  { TransformedImageFill<PixelARGB, PixelRGB, true>  r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                else            { TransformedImageFill<PixelARGB, PixelRGB, false> r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                break;
            case Image::SingleChannel:
            case Image::UnknownFormat:
            default:
                if (tiledFill)  { TransformedImageFill<PixelARGB, PixelAlpha, true>  r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                else            { TransformedImageFill<PixelARGB, PixelAlpha, false> r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                break;
            }
            break;

        case Image::RGB:
        {
            switch (srcData.pixelFormat)
            {
            case Image::ARGB:
                if (tiledFill)  { TransformedImageFill<PixelRGB, PixelARGB, true>  r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                else            { TransformedImageFill<PixelRGB, PixelARGB, false> r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                break;
            case Image::RGB:
                if (tiledFill)  { TransformedImageFill<PixelRGB, PixelRGB, true>  r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                else            { TransformedImageFill<PixelRGB, PixelRGB, false> r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                break;
            case Image::SingleChannel:
            case Image::UnknownFormat:
            default:
                if (tiledFill)  { TransformedImageFill<PixelRGB, PixelAlpha, true>  r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                else            { TransformedImageFill<PixelRGB, PixelAlpha, false> r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                break;
            }
            break;
        }

        case Image::SingleChannel:
        case Image::UnknownFormat:
        default:
            switch (srcData.pixelFormat)
            {
            case Image::ARGB:
                if (tiledFill)  { TransformedImageFill<PixelAlpha, PixelARGB, true>  r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                else            { TransformedImageFill<PixelAlpha, PixelARGB, false> r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                break;
            case Image::RGB:
                if (tiledFill)  { TransformedImageFill<PixelAlpha, PixelRGB, true>  r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                else            { TransformedImageFill<PixelAlpha, PixelRGB, false> r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                break;
            case Image::SingleChannel:
            case Image::UnknownFormat:
            default:
                if (tiledFill)  { TransformedImageFill<PixelAlpha, PixelAlpha, true>  r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                else            { TransformedImageFill<PixelAlpha, PixelAlpha, false> r (destData, srcData, transform, alpha, quality); iter.iterate (r); }
                break;
            }
            break;
        }
    }

    template <class Iterator>
    void renderImageUntransformed (Iterator& iter, const Image::BitmapData& destData, const Image::BitmapData& srcData, int alpha, int x, int y, bool tiledFill)
    {
        switch (destData.pixelFormat)
        {
        case Image::ARGB:
            switch (srcData.pixelFormat)
            {
            case Image::ARGB:
                if (tiledFill)  { ImageFill<PixelARGB, PixelARGB, true>  r (destData, srcData, alpha, x, y); iter.iterate (r); }
                else            { ImageFill<PixelARGB, PixelARGB, false> r (destData, srcData, alpha, x, y); iter.iterate (r); }
                break;
            case Image::RGB:
                if (tiledFill)  { ImageFill<PixelARGB, PixelRGB, true>  r (destData, srcData, alpha, x, y); iter.iterate (r); }
                else            { ImageFill<PixelARGB, PixelRGB, false> r (destData, srcData, alpha, x, y); iter.iterate (r); }
                break;
            case Image::SingleChannel:
            case Image::UnknownFormat:
            default:
                if (tiledFill)  { ImageFill<PixelARGB, PixelAlpha, true>  r (destData, srcData, alpha, x, y); iter.iterate (r); }
                else            { ImageFill<PixelARGB, PixelAlpha, false> r (destData, srcData, alpha, x, y); iter.iterate (r); }
                break;
            }
            break;

        case Image::RGB:
            switch (srcData.pixelFormat)
            {
            case Image::ARGB:
                if (tiledFill)  { ImageFill<PixelRGB, PixelARGB, true>  r (destData, srcData, alpha, x, y); iter.iterate (r); }
                else            { ImageFill<PixelRGB, PixelARGB, false> r (destData, srcData, alpha, x, y); iter.iterate (r); }
                break;
            case Image::RGB:
                if (tiledFill)  { ImageFill<PixelRGB, PixelRGB, true>  r (destData, srcData, alpha, x, y); iter.iterate (r); }
                else            { ImageFill<PixelRGB, PixelRGB, false> r (destData, srcData, alpha, x, y); iter.iterate (r); }
                break;
            case Image::SingleChannel:
            case Image::UnknownFormat:
            default:
                if (tiledFill)  { ImageFill<PixelRGB, PixelAlpha, true>  r (destData, srcData, alpha, x, y); iter.iterate (r); }
                else            { ImageFill<PixelRGB, PixelAlpha, false> r (destData, srcData, alpha, x, y); iter.iterate (r); }
                break;
            }
            break;

        case Image::SingleChannel:
        case Image::UnknownFormat:
        default:
            switch (srcData.pixelFormat)
            {
            case Image::ARGB:
                if (tiledFill)  { ImageFill<PixelAlpha, PixelARGB, true>   r (destData, srcData, alpha, x, y); iter.iterate (r); }
                else            { ImageFill<PixelAlpha, PixelARGB, false>  r (destData, srcData, alpha, x, y); iter.iterate (r); }
                break;
            case Image::RGB:
                if (tiledFill)  { ImageFill<PixelAlpha, PixelRGB, true>    r (destData, srcData, alpha, x, y); iter.iterate (r); }
                else            { ImageFill<PixelAlpha, PixelRGB, false>   r (destData, srcData, alpha, x, y); iter.iterate (r); }
                break;
            case Image::SingleChannel:
            case Image::UnknownFormat:
            default:
                if (tiledFill)  { ImageFill<PixelAlpha, PixelAlpha, true>  r (destData, srcData, alpha, x, y); iter.iterate (r); }
                else            { ImageFill<PixelAlpha, PixelAlpha, false> r (destData, srcData, alpha, x, y); iter.iterate (r); }
                break;
            }
            break;
        }
    }

    template <class Iterator, class DestPixelType>
    void renderSolidFill (Iterator& iter, const Image::BitmapData& destData, PixelARGB fillColour, bool replaceContents, DestPixelType*)
    {
        if (replaceContents)
        {
            EdgeTableFillers::SolidColour<DestPixelType, true> r (destData, fillColour);
            iter.iterate (r);
        }
        else
        {
            EdgeTableFillers::SolidColour<DestPixelType, false> r (destData, fillColour);
            iter.iterate (r);
        }
    }

    template <class Iterator, class DestPixelType>
    void renderGradient (Iterator& iter, const Image::BitmapData& destData, const ColourGradient& g, const AffineTransform& transform,
                         const PixelARGB* lookupTable, int numLookupEntries, bool isIdentity, DestPixelType*)
    {
        if (g.isRadial)
        {
            if (isIdentity)
            {
                EdgeTableFillers::Gradient<DestPixelType, GradientPixelIterators::Radial> renderer (destData, g, transform, lookupTable, numLookupEntries);
                iter.iterate (renderer);
            }
            else
            {
                EdgeTableFillers::Gradient<DestPixelType, GradientPixelIterators::TransformedRadial> renderer (destData, g, transform, lookupTable, numLookupEntries);
                iter.iterate (renderer);
            }
        }
        else
        {
            EdgeTableFillers::Gradient<DestPixelType, GradientPixelIterators::Linear> renderer (destData, g, transform, lookupTable, numLookupEntries);
            iter.iterate (renderer);
        }
    }
}

//==============================================================================
namespace ClipRegions
{
    template <typename SavedStateType>
    struct Base  : public SingleThreadedReferenceCountedObject
    {
        Base() = default;
        ~Base() override = default;

        using Ptr = ReferenceCountedObjectPtr<Base>;

        virtual Ptr clone() const = 0;
        virtual Ptr applyClipTo (const Ptr& target) const = 0;

        virtual Ptr clipToRectangle (Rectangle<int>) = 0;
        virtual Ptr clipToRectangleList (const RectangleList<int>&) = 0;
        virtual Ptr excludeClipRectangle (Rectangle<int>) = 0;
        virtual Ptr clipToPath (const Path&, const AffineTransform&) = 0;
        virtual Ptr clipToEdgeTable (const EdgeTable&) = 0;
        virtual Ptr clipToImageAlpha (const Image&, const AffineTransform&, Graphics::ResamplingQuality) = 0;
        virtual void translate (Point<int> delta) = 0;

        virtual bool clipRegionIntersects (Rectangle<int>) const = 0;
        virtual Rectangle<int> getClipBounds() const = 0;

        virtual void fillRectWithColour (SavedStateType&, Rectangle<int>, PixelARGB colour, bool replaceContents) const = 0;
        virtual void fillRectWithColour (SavedStateType&, Rectangle<float>, PixelARGB colour) const = 0;
        virtual void fillAllWithColour (SavedStateType&, PixelARGB colour, bool replaceContents) const = 0;
        virtual void fillAllWithGradient (SavedStateType&, ColourGradient&, const AffineTransform&, bool isIdentity) const = 0;
        virtual void renderImageTransformed (SavedStateType&, const Image&, int alpha, const AffineTransform&, Graphics::ResamplingQuality, bool tiledFill) const = 0;
        virtual void renderImageUntransformed (SavedStateType&, const Image&, int alpha, int x, int y, bool tiledFill) const = 0;
    };

    //==============================================================================
    template <typename SavedStateType>
    struct EdgeTableRegion  : public Base<SavedStateType>
    {
        EdgeTableRegion (const EdgeTable& e)            : edgeTable (e) {}
        EdgeTableRegion (Rectangle<int> r)              : edgeTable (r) {}
        EdgeTableRegion (Rectangle<float> r)            : edgeTable (r) {}
        EdgeTableRegion (const RectangleList<int>& r)   : edgeTable (r) {}
        EdgeTableRegion (const RectangleList<float>& r) : edgeTable (r) {}
        EdgeTableRegion (Rectangle<int> bounds, const Path& p, const AffineTransform& t) : edgeTable (bounds, p, t) {}

        EdgeTableRegion (const EdgeTableRegion& other)  : edgeTable (other.edgeTable) {}
        EdgeTableRegion& operator= (const EdgeTableRegion&) = delete;

        using Ptr = typename Base<SavedStateType>::Ptr;

        Ptr clone() const override                           { return *new EdgeTableRegion (*this); }
        Ptr applyClipTo (const Ptr& target) const override   { return target->clipToEdgeTable (edgeTable); }

        Ptr clipToRectangle (Rectangle<int> r) override
        {
            edgeTable.clipToRectangle (r);
            return edgeTable.isEmpty() ? Ptr() : Ptr (*this);
        }

        Ptr clipToRectangleList (const RectangleList<int>& r) override
        {
            RectangleList<int> inverse (edgeTable.getMaximumBounds());

            if (inverse.subtract (r))
                for (auto& i : inverse)
                    edgeTable.excludeRectangle (i);

            return edgeTable.isEmpty() ? Ptr() : Ptr (*this);
        }

        Ptr excludeClipRectangle (Rectangle<int> r) override
        {
            edgeTable.excludeRectangle (r);
            return edgeTable.isEmpty() ? Ptr() : Ptr (*this);
        }

        Ptr clipToPath (const Path& p, const AffineTransform& transform) override
        {
            EdgeTable et (edgeTable.getMaximumBounds(), p, transform);
            edgeTable.clipToEdgeTable (et);
            return edgeTable.isEmpty() ? Ptr() : Ptr (*this);
        }

        Ptr clipToEdgeTable (const EdgeTable& et) override
        {
            edgeTable.clipToEdgeTable (et);
            return edgeTable.isEmpty() ? Ptr() : Ptr (*this);
        }

        Ptr clipToImageAlpha (const Image& image, const AffineTransform& transform, Graphics::ResamplingQuality quality) override
        {
            const Image::BitmapData srcData (image, Image::BitmapData::readOnly);

            if (transform.isOnlyTranslation())
            {
                // if our translation doesn't involve any distortion, just use a simple blit
                auto tx = (int) (transform.getTranslationX() * 256.0f);
                auto ty = (int) (transform.getTranslationY() * 256.0f);

                if (quality == Graphics::lowResamplingQuality || ((tx | ty) & 224) == 0)
                {
                    auto imageX = ((tx + 128) >> 8);
                    auto imageY = ((ty + 128) >> 8);

                    if (image.getFormat() == Image::ARGB)
                        straightClipImage (srcData, imageX, imageY, (PixelARGB*) nullptr);
                    else
                        straightClipImage (srcData, imageX, imageY, (PixelAlpha*) nullptr);

                    return edgeTable.isEmpty() ? Ptr() : Ptr (*this);
                }
            }

            if (transform.isSingularity())
                return Ptr();

            {
                Path p;
                p.addRectangle (0, 0, (float) srcData.width, (float) srcData.height);
                EdgeTable et2 (edgeTable.getMaximumBounds(), p, transform);
                edgeTable.clipToEdgeTable (et2);
            }

            if (! edgeTable.isEmpty())
            {
                if (image.getFormat() == Image::ARGB)
                    transformedClipImage (srcData, transform, quality, (PixelARGB*) nullptr);
                else
                    transformedClipImage (srcData, transform, quality, (PixelAlpha*) nullptr);
            }

            return edgeTable.isEmpty() ? Ptr() : Ptr (*this);
        }

        void translate (Point<int> delta) override
        {
            edgeTable.translate ((float) delta.x, delta.y);
        }

        bool clipRegionIntersects (Rectangle<int> r) const override
        {
            return edgeTable.getMaximumBounds().intersects (r);
        }

        Rectangle<int> getClipBounds() const override
        {
            return edgeTable.getMaximumBounds();
        }

        void fillRectWithColour (SavedStateType& state, Rectangle<int> area, PixelARGB colour, bool replaceContents) const override
        {
            fillRectWithColourImpl (state, area, colour, replaceContents);
        }

        void fillRectWithColour (SavedStateType& state, Rectangle<float> area, PixelARGB colour) const override
        {
            fillRectWithColourImpl (state, area, colour, false);
        }

        void fillAllWithColour (SavedStateType& state, PixelARGB colour, bool replaceContents) const override
        {
            state.fillWithSolidColour (edgeTable, colour, replaceContents);
        }

        void fillAllWithGradient (SavedStateType& state, ColourGradient& gradient, const AffineTransform& transform, bool isIdentity) const override
        {
            state.fillWithGradient (edgeTable, gradient, transform, isIdentity);
        }

        void renderImageTransformed (SavedStateType& state, const Image& src, int alpha, const AffineTransform& transform, Graphics::ResamplingQuality quality, bool tiledFill) const override
        {
            state.renderImageTransformed (edgeTable, src, alpha, transform, quality, tiledFill);
        }

        void renderImageUntransformed (SavedStateType& state, const Image& src, int alpha, int x, int y, bool tiledFill) const override
        {
            state.renderImageUntransformed (edgeTable, src, alpha, x, y, tiledFill);
        }

        EdgeTable edgeTable;

    private:
        template <typename Value>
        void fillRectWithColourImpl (SavedStateType& state, Rectangle<Value> area, PixelARGB colour, bool replace) const
        {
            auto totalClip = edgeTable.getMaximumBounds().template toType<Value>();
            auto clipped = totalClip.getIntersection (area);

            if (clipped.isEmpty())
                return;

            EdgeTableRegion et (clipped);
            et.edgeTable.clipToEdgeTable (edgeTable);
            state.fillWithSolidColour (et.edgeTable, colour, replace);
        }

        template <class SrcPixelType>
        void transformedClipImage (const Image::BitmapData& srcData, const AffineTransform& transform, Graphics::ResamplingQuality quality, const SrcPixelType*)
        {
            EdgeTableFillers::TransformedImageFill<SrcPixelType, SrcPixelType, false> renderer (srcData, srcData, transform, 255, quality);

            for (int y = 0; y < edgeTable.getMaximumBounds().getHeight(); ++y)
                renderer.clipEdgeTableLine (edgeTable, edgeTable.getMaximumBounds().getX(), y + edgeTable.getMaximumBounds().getY(),
                                            edgeTable.getMaximumBounds().getWidth());
        }

        template <class SrcPixelType>
        void straightClipImage (const Image::BitmapData& srcData, int imageX, int imageY, const SrcPixelType*)
        {
            Rectangle<int> r (imageX, imageY, srcData.width, srcData.height);
            edgeTable.clipToRectangle (r);

            EdgeTableFillers::ImageFill<SrcPixelType, SrcPixelType, false> renderer (srcData, srcData, 255, imageX, imageY);

            for (int y = 0; y < r.getHeight(); ++y)
                renderer.clipEdgeTableLine (edgeTable, r.getX(), y + r.getY(), r.getWidth());
        }
    };

    //==============================================================================
    template <typename SavedStateType>
    class RectangleListRegion  : public Base<SavedStateType>
    {
    public:
        RectangleListRegion (Rectangle<int> r) : clip (r) {}
        RectangleListRegion (const RectangleList<int>& r)  : clip (r) {}
        RectangleListRegion (const RectangleListRegion& other) : clip (other.clip) {}

        using Ptr = typename Base<SavedStateType>::Ptr;

        Ptr clone() const override                           { return *new RectangleListRegion (*this); }
        Ptr applyClipTo (const Ptr& target) const override   { return target->clipToRectangleList (clip); }

        Ptr clipToRectangle (Rectangle<int> r) override
        {
            clip.clipTo (r);
            return clip.isEmpty() ? Ptr() : Ptr (*this);
        }

        Ptr clipToRectangleList (const RectangleList<int>& r) override
        {
            clip.clipTo (r);
            return clip.isEmpty() ? Ptr() : Ptr (*this);
        }

        Ptr excludeClipRectangle (Rectangle<int> r) override
        {
            clip.subtract (r);
            return clip.isEmpty() ? Ptr() : Ptr (*this);
        }

        Ptr clipToPath (const Path& p, const AffineTransform& transform) override  { return toEdgeTable()->clipToPath (p, transform); }
        Ptr clipToEdgeTable (const EdgeTable& et) override                         { return toEdgeTable()->clipToEdgeTable (et); }

        Ptr clipToImageAlpha (const Image& image, const AffineTransform& transform, Graphics::ResamplingQuality quality) override
        {
            return toEdgeTable()->clipToImageAlpha (image, transform, quality);
        }

        void translate (Point<int> delta) override                    { clip.offsetAll (delta); }
        bool clipRegionIntersects (Rectangle<int> r) const override   { return clip.intersects (r); }
        Rectangle<int> getClipBounds() const override                 { return clip.getBounds(); }

        void fillRectWithColour (SavedStateType& state, Rectangle<int> area, PixelARGB colour, bool replaceContents) const override
        {
            SubRectangleIterator iter (clip, area);
            state.fillWithSolidColour (iter, colour, replaceContents);
        }

        void fillRectWithColour (SavedStateType& state, Rectangle<float> area, PixelARGB colour) const override
        {
            SubRectangleIteratorFloat iter (clip, area);
            state.fillWithSolidColour (iter, colour, false);
        }

        void fillAllWithColour (SavedStateType& state, PixelARGB colour, bool replaceContents) const override
        {
            state.fillWithSolidColour (*this, colour, replaceContents);
        }

        void fillAllWithGradient (SavedStateType& state, ColourGradient& gradient, const AffineTransform& transform, bool isIdentity) const override
        {
            state.fillWithGradient (*this, gradient, transform, isIdentity);
        }

        void renderImageTransformed (SavedStateType& state, const Image& src, int alpha, const AffineTransform& transform, Graphics::ResamplingQuality quality, bool tiledFill) const override
        {
            state.renderImageTransformed (*this, src, alpha, transform, quality, tiledFill);
        }

        void renderImageUntransformed (SavedStateType& state, const Image& src, int alpha, int x, int y, bool tiledFill) const override
        {
            state.renderImageUntransformed (*this, src, alpha, x, y, tiledFill);
        }

        RectangleList<int> clip;

        //==============================================================================
        template <class Renderer>
        void iterate (Renderer& r) const noexcept
        {
            for (auto& i : clip)
            {
                auto x = i.getX();
                auto w = i.getWidth();
                jassert (w > 0);
                auto bottom = i.getBottom();

                for (int y = i.getY(); y < bottom; ++y)
                {
                    r.setEdgeTableYPos (y);
                    r.handleEdgeTableLineFull (x, w);
                }
            }
        }

    private:
        //==============================================================================
        class SubRectangleIterator
        {
        public:
            SubRectangleIterator (const RectangleList<int>& clipList, Rectangle<int> clipBounds)
                : clip (clipList), area (clipBounds)
            {}

            template <class Renderer>
            void iterate (Renderer& r) const noexcept
            {
                for (auto& i : clip)
                {
                    auto rect = i.getIntersection (area);

                    if (! rect.isEmpty())
                        r.handleEdgeTableRectangleFull (rect.getX(), rect.getY(), rect.getWidth(), rect.getHeight());
                }
            }

        private:
            const RectangleList<int>& clip;
            const Rectangle<int> area;

            JUCE_DECLARE_NON_COPYABLE (SubRectangleIterator)
        };

        //==============================================================================
        class SubRectangleIteratorFloat
        {
        public:
            SubRectangleIteratorFloat (const RectangleList<int>& clipList, Rectangle<float> clipBounds) noexcept
                : clip (clipList), area (clipBounds)
            {
            }

            template <class Renderer>
            void iterate (Renderer& r) const noexcept
            {
                const RenderingHelpers::FloatRectangleRasterisingInfo f (area);

                for (auto& i : clip)
                {
                    auto clipLeft   = i.getX();
                    auto clipRight  = i.getRight();
                    auto clipTop    = i.getY();
                    auto clipBottom = i.getBottom();

                    if (f.totalBottom > clipTop && f.totalTop < clipBottom
                         && f.totalRight > clipLeft && f.totalLeft < clipRight)
                    {
                        if (f.isOnePixelWide())
                        {
                            if (f.topAlpha != 0 && f.totalTop >= clipTop)
                            {
                                r.setEdgeTableYPos (f.totalTop);
                                r.handleEdgeTablePixel (f.left, f.topAlpha);
                            }

                            auto y1 = jmax (clipTop, f.top);
                            auto y2 = jmin (f.bottom, clipBottom);
                            auto h = y2 - y1;

                            if (h > 0)
                                r.handleEdgeTableRectangleFull (f.left, y1, 1, h);

                            if (f.bottomAlpha != 0 && f.bottom < clipBottom)
                            {
                                r.setEdgeTableYPos (f.bottom);
                                r.handleEdgeTablePixel (f.left, f.bottomAlpha);
                            }
                        }
                        else
                        {
                            auto clippedLeft   = jmax (f.left, clipLeft);
                            auto clippedWidth  = jmin (f.right, clipRight) - clippedLeft;
                            bool doLeftAlpha  = f.leftAlpha != 0 && f.totalLeft >= clipLeft;
                            bool doRightAlpha = f.rightAlpha != 0 && f.right < clipRight;

                            if (f.topAlpha != 0 && f.totalTop >= clipTop)
                            {
                                r.setEdgeTableYPos (f.totalTop);

                                if (doLeftAlpha)        r.handleEdgeTablePixel (f.totalLeft, f.getTopLeftCornerAlpha());
                                if (clippedWidth > 0)   r.handleEdgeTableLine (clippedLeft, clippedWidth, f.topAlpha);
                                if (doRightAlpha)       r.handleEdgeTablePixel (f.right, f.getTopRightCornerAlpha());
                            }

                            auto y1 = jmax (clipTop, f.top);
                            auto y2 = jmin (f.bottom, clipBottom);
                            auto h = y2 - y1;

                            if (h > 0)
                            {
                                if (h == 1)
                                {
                                    r.setEdgeTableYPos (y1);

                                    if (doLeftAlpha)        r.handleEdgeTablePixel (f.totalLeft, f.leftAlpha);
                                    if (clippedWidth > 0)   r.handleEdgeTableLineFull (clippedLeft, clippedWidth);
                                    if (doRightAlpha)       r.handleEdgeTablePixel (f.right, f.rightAlpha);
                                }
                                else
                                {
                                    if (doLeftAlpha)        r.handleEdgeTableRectangle (f.totalLeft, y1, 1, h, f.leftAlpha);
                                    if (clippedWidth > 0)   r.handleEdgeTableRectangleFull (clippedLeft, y1, clippedWidth, h);
                                    if (doRightAlpha)       r.handleEdgeTableRectangle (f.right, y1, 1, h, f.rightAlpha);
                                }
                            }

                            if (f.bottomAlpha != 0 && f.bottom < clipBottom)
                            {
                                r.setEdgeTableYPos (f.bottom);

                                if (doLeftAlpha)        r.handleEdgeTablePixel (f.totalLeft, f.getBottomLeftCornerAlpha());
                                if (clippedWidth > 0)   r.handleEdgeTableLine (clippedLeft, clippedWidth, f.bottomAlpha);
                                if (doRightAlpha)       r.handleEdgeTablePixel (f.right, f.getBottomRightCornerAlpha());
                            }
                        }
                    }
                }
            }

        private:
            const RectangleList<int>& clip;
            Rectangle<float> area;

            JUCE_DECLARE_NON_COPYABLE (SubRectangleIteratorFloat)
        };

        Ptr toEdgeTable() const   { return *new EdgeTableRegion<SavedStateType> (clip); }

        RectangleListRegion& operator= (const RectangleListRegion&) = delete;
    };
}

//==============================================================================
template <class SavedStateType>
class SavedStateBase
{
public:
    using BaseRegionType           = typename ClipRegions::Base<SavedStateType>;
    using EdgeTableRegionType      = typename ClipRegions::EdgeTableRegion<SavedStateType>;
    using RectangleListRegionType  = typename ClipRegions::RectangleListRegion<SavedStateType>;

    SavedStateBase (Rectangle<int> initialClip)
        : clip (new RectangleListRegionType (initialClip)),
          interpolationQuality (Graphics::mediumResamplingQuality), transparencyLayerAlpha (1.0f)
    {
    }

    SavedStateBase (const RectangleList<int>& clipList, Point<int> origin)
        : clip (new RectangleListRegionType (clipList)), transform (origin),
          interpolationQuality (Graphics::mediumResamplingQuality), transparencyLayerAlpha (1.0f)
    {
    }

    SavedStateBase (const SavedStateBase& other)
        : clip (other.clip), transform (other.transform), fillType (other.fillType),
          interpolationQuality (other.interpolationQuality),
          transparencyLayerAlpha (other.transparencyLayerAlpha)
    {
    }

    SavedStateType& getThis() noexcept  { return *static_cast<SavedStateType*> (this); }

    bool clipToRectangle (Rectangle<int> r)
    {
        if (clip != nullptr)
        {
            if (transform.isOnlyTranslated)
            {
                cloneClipIfMultiplyReferenced();
                clip = clip->clipToRectangle (transform.translated (r));
            }
            else if (! transform.isRotated)
            {
                cloneClipIfMultiplyReferenced();
                clip = clip->clipToRectangle (transform.transformed (r));
            }
            else
            {
                Path p;
                p.addRectangle (r);
                clipToPath (p, {});
            }
        }

        return clip != nullptr;
    }

    bool clipToRectangleList (const RectangleList<int>& r)
    {
        if (clip != nullptr)
        {
            if (transform.isOnlyTranslated)
            {
                cloneClipIfMultiplyReferenced();

                if (transform.isIdentity())
                {
                    clip = clip->clipToRectangleList (r);
                }
                else
                {
                    RectangleList<int> offsetList (r);
                    offsetList.offsetAll (transform.offset);
                    clip = clip->clipToRectangleList (offsetList);
                }
            }
            else
            {
                clipToPath (r.toPath(), {});
            }
        }

        return clip != nullptr;
    }

    bool excludeClipRectangle (Rectangle<int> r)
    {
        if (clip != nullptr)
        {
            cloneClipIfMultiplyReferenced();

            if (transform.isOnlyTranslated)
            {
                clip = clip->excludeClipRectangle (transform.translated (r.toFloat()).getLargestIntegerWithin());
            }
            else if (! transform.isRotated)
            {
                clip = clip->excludeClipRectangle (transform.boundsAfterTransform (r.toFloat()).getLargestIntegerWithin());
            }
            else
            {
                Path p;
                p.addRectangle (r.toFloat());
                p.applyTransform (transform.complexTransform);
                p.addRectangle (clip->getClipBounds().toFloat());
                p.setUsingNonZeroWinding (false);
                clip = clip->clipToPath (p, {});
            }
        }

        return clip != nullptr;
    }

    void clipToPath (const Path& p, const AffineTransform& t)
    {
        if (clip != nullptr)
        {
            cloneClipIfMultiplyReferenced();
            clip = clip->clipToPath (p, transform.getTransformWith (t));
        }
    }

    void clipToImageAlpha (const Image& sourceImage, const AffineTransform& t)
    {
        if (clip != nullptr)
        {
            if (sourceImage.hasAlphaChannel())
            {
                cloneClipIfMultiplyReferenced();
                clip = clip->clipToImageAlpha (sourceImage, transform.getTransformWith (t), interpolationQuality);
            }
            else
            {
                Path p;
                p.addRectangle (sourceImage.getBounds());
                clipToPath (p, t);
            }
        }
    }

    bool clipRegionIntersects (Rectangle<int> r) const
    {
        if (clip != nullptr)
        {
            if (transform.isOnlyTranslated)
                return clip->clipRegionIntersects (transform.translated (r));

            return getClipBounds().intersects (r);
        }

        return false;
    }

    Rectangle<int> getClipBounds() const
    {
        return clip != nullptr ? transform.deviceSpaceToUserSpace (clip->getClipBounds()).getSmallestIntegerContainer()
                               : Rectangle<int>();
    }

    void setFillType (const FillType& newFill)
    {
        fillType = newFill;
    }

    void fillTargetRect (Rectangle<int> r, bool replaceContents)
    {
        if (fillType.isColour())
        {
            clip->fillRectWithColour (getThis(), r, fillType.colour.getPixelARGB(), replaceContents);
        }
        else
        {
            auto clipped = clip->getClipBounds().getIntersection (r);

            if (! clipped.isEmpty())
                fillShape (*new RectangleListRegionType (clipped), false);
        }
    }

    void fillTargetRect (Rectangle<float> r)
    {
        if (fillType.isColour())
        {
            clip->fillRectWithColour (getThis(), r, fillType.colour.getPixelARGB());
        }
        else
        {
            auto clipped = clip->getClipBounds().toFloat().getIntersection (r);

            if (! clipped.isEmpty())
                fillShape (*new EdgeTableRegionType (clipped), false);
        }
    }

    template <typename CoordType>
    void fillRectAsPath (Rectangle<CoordType> r)
    {
        Path p;
        p.addRectangle (r);
        fillPath (p, {});
    }

    void fillRect (Rectangle<int> r, bool replaceContents)
    {
        if (r.isEmpty())
            return;

        if (clip != nullptr)
        {
            if (transform.isOnlyTranslated)
            {
                fillTargetRect (transform.translated (r), replaceContents);
            }
            else if (! transform.isRotated)
            {
                if (replaceContents)
                    fillTargetRect (transform.boundsAfterTransform (r.toFloat()).toNearestInt(), true);
                else
                    fillTargetRect (transform.boundsAfterTransform (r.toFloat()));
            }
            else
            {
                jassert (! replaceContents); // not implemented
                fillRectAsPath (r);
            }
        }
    }

    void fillRect (Rectangle<float> r)
    {
        if (r.isEmpty())
            return;

        if (clip != nullptr)
        {
            if (transform.isOnlyTranslated)
                fillTargetRect (transform.translated (r));
            else if (! transform.isRotated)
                fillTargetRect (transform.boundsAfterTransform (r));
            else
                fillRectAsPath (r);
        }
    }

    void fillRectList (const RectangleList<float>& list)
    {
        if (clip != nullptr)
        {
            if (list.getNumRectangles() == 1)
                return fillRect (*list.begin());

            if (transform.isIdentity())
            {
                fillShape (*new EdgeTableRegionType (list), false);
            }
            else if (! transform.isRotated)
            {
                RectangleList<float> transformed (list);

                if (transform.isOnlyTranslated)
                    transformed.offsetAll (transform.offset.toFloat());
                else
                    transformed.transformAll (transform.getTransform());

                fillShape (*new EdgeTableRegionType (transformed), false);
            }
            else
            {
                fillPath (list.toPath(), {});
            }
        }
    }

    void fillPath (const Path& path, const AffineTransform& t)
    {
        if (clip != nullptr)
        {
            auto trans = transform.getTransformWith (t);
            auto clipRect = clip->getClipBounds();

            if (path.getBoundsTransformed (trans).getSmallestIntegerContainer().intersects (clipRect))
                fillShape (*new EdgeTableRegionType (clipRect, path, trans), false);
        }
    }

    void fillEdgeTable (const EdgeTable& edgeTable, float x, int y)
    {
        if (clip != nullptr)
        {
            auto* edgeTableClip = new EdgeTableRegionType (edgeTable);
            edgeTableClip->edgeTable.translate (x, y);

            fillShape (*edgeTableClip, false);
        }
    }

    void drawLine (Line<float> line)
    {
        Path p;
        p.addLineSegment (line, 1.0f);
        fillPath (p, {});
    }

    void drawImage (const Image& sourceImage, const AffineTransform& trans)
    {
        if (clip != nullptr && ! fillType.colour.isTransparent())
            renderImage (sourceImage, trans, {});
    }

    static bool isOnlyTranslationAllowingError (const AffineTransform& t, float tolerance) noexcept
    {
        return std::abs (t.mat01) < tolerance
            && std::abs (t.mat10) < tolerance
            && std::abs (t.mat00 - 1.0f) < tolerance
            && std::abs (t.mat11 - 1.0f) < tolerance;
    }

    void renderImage (const Image& sourceImage, const AffineTransform& trans, const BaseRegionType* tiledFillClipRegion)
    {
        auto t = transform.getTransformWith (trans);
        auto alpha = fillType.colour.getAlpha();

        if (isOnlyTranslationAllowingError (t, 0.002f))
        {
            // if our translation doesn't involve any distortion, just use a simple blit
            auto tx = (int) (t.getTranslationX() * 256.0f);
            auto ty = (int) (t.getTranslationY() * 256.0f);

            if (interpolationQuality == Graphics::lowResamplingQuality || ((tx | ty) & 224) == 0)
            {
                tx = ((tx + 128) >> 8);
                ty = ((ty + 128) >> 8);

                if (tiledFillClipRegion != nullptr)
                {
                    tiledFillClipRegion->renderImageUntransformed (getThis(), sourceImage, alpha, tx, ty, true);
                }
                else
                {
                    Rectangle<int> area (tx, ty, sourceImage.getWidth(), sourceImage.getHeight());
                    area = area.getIntersection (getThis().getMaximumBounds());

                    if (! area.isEmpty())
                        if (auto c = clip->applyClipTo (*new EdgeTableRegionType (area)))
                            c->renderImageUntransformed (getThis(), sourceImage, alpha, tx, ty, false);
                }

                return;
            }
        }

        if (! t.isSingularity())
        {
            if (tiledFillClipRegion != nullptr)
            {
                tiledFillClipRegion->renderImageTransformed (getThis(), sourceImage, alpha,
                                                             t, interpolationQuality, true);
            }
            else
            {
                Path p;
                p.addRectangle (sourceImage.getBounds());

                if (auto c = clip->clone()->clipToPath (p, t))
                    c->renderImageTransformed (getThis(), sourceImage, alpha,
                                               t, interpolationQuality, false);
            }
        }
    }

    void fillShape (typename BaseRegionType::Ptr shapeToFill, bool replaceContents)
    {
        jassert (clip != nullptr);
        shapeToFill = clip->applyClipTo (shapeToFill);

        if (shapeToFill != nullptr)
        {
            if (fillType.isGradient())
            {
                jassert (! replaceContents); // that option is just for solid colours

                auto g2 = *(fillType.gradient);
                g2.multiplyOpacity (fillType.getOpacity());
                auto t = transform.getTransformWith (fillType.transform).translated (-0.5f, -0.5f);

                bool isIdentity = t.isOnlyTranslation();

                if (isIdentity)
                {
                    // if our translation doesn't involve any distortion, we can speed it up
                    g2.point1.applyTransform (t);
                    g2.point2.applyTransform (t);
                    t = {};
                }

                shapeToFill->fillAllWithGradient (getThis(), g2, t, isIdentity);
            }
            else if (fillType.isTiledImage())
            {
                renderImage (fillType.image, fillType.transform, shapeToFill.get());
            }
            else
            {
                shapeToFill->fillAllWithColour (getThis(), fillType.colour.getPixelARGB(), replaceContents);
            }
        }
    }

    void cloneClipIfMultiplyReferenced()
    {
        if (clip->getReferenceCount() > 1)
            clip = clip->clone();
    }

    typename BaseRegionType::Ptr clip;
    RenderingHelpers::TranslationOrTransform transform;
    FillType fillType;
    Graphics::ResamplingQuality interpolationQuality;
    float transparencyLayerAlpha;
};

//==============================================================================
class SoftwareRendererSavedState  : public SavedStateBase<SoftwareRendererSavedState>
{
    using BaseClass = SavedStateBase<SoftwareRendererSavedState>;

public:
    SoftwareRendererSavedState (const Image& im, Rectangle<int> clipBounds)
        : BaseClass (clipBounds), image (im)
    {
    }

    SoftwareRendererSavedState (const Image& im, const RectangleList<int>& clipList, Point<int> origin)
        : BaseClass (clipList, origin), image (im)
    {
    }

    SoftwareRendererSavedState (const SoftwareRendererSavedState& other) = default;

    std::unique_ptr<SoftwareRendererSavedState> beginTransparencyLayer (float opacity)
    {
        auto s = std::make_unique<SoftwareRendererSavedState> (*this);

        if (clip != nullptr)
        {
            auto layerBounds = clip->getClipBounds();

            const auto imageType = image.getPixelData()->createLowLevelContext()
                                                       ->getPreferredImageTypeForTemporaryImages();

            s->image = Image (Image::ARGB,
                              layerBounds.getWidth(),
                              layerBounds.getHeight(),
                              true,
                              *imageType);

            s->transparencyLayerAlpha = opacity;
            s->transform.moveOriginInDeviceSpace (-layerBounds.getPosition());
            s->cloneClipIfMultiplyReferenced();
            s->clip->translate (-layerBounds.getPosition());
        }

        return s;
    }

    void endTransparencyLayer (SoftwareRendererSavedState& finishedLayerState)
    {
        if (clip != nullptr)
        {
            auto layerBounds = clip->getClipBounds();

            auto g = image.createLowLevelContext();
            g->setOpacity (finishedLayerState.transparencyLayerAlpha);
            g->drawImage (finishedLayerState.image, AffineTransform::translation (layerBounds.getPosition()));
        }
    }

    static void clearGlyphCache()
    {
        GlyphCache::getInstance().reset();
    }

    //==============================================================================
    Rectangle<int> getMaximumBounds() const     { return image.getBounds(); }

    //==============================================================================
    template <typename IteratorType>
    void renderImageTransformed (IteratorType& iter, const Image& src, int alpha, const AffineTransform& trans, Graphics::ResamplingQuality quality, bool tiledFill) const
    {
        Image::BitmapData destData (image, Image::BitmapData::readWrite);
        const Image::BitmapData srcData (src, Image::BitmapData::readOnly);
        EdgeTableFillers::renderImageTransformed (iter, destData, srcData, alpha, trans, quality, tiledFill);
    }

    template <typename IteratorType>
    void renderImageUntransformed (IteratorType& iter, const Image& src, int alpha, int x, int y, bool tiledFill) const
    {
        Image::BitmapData destData (image, Image::BitmapData::readWrite);
        const Image::BitmapData srcData (src, Image::BitmapData::readOnly);
        EdgeTableFillers::renderImageUntransformed (iter, destData, srcData, alpha, x, y, tiledFill);
    }

    template <typename IteratorType>
    void fillWithSolidColour (IteratorType& iter, PixelARGB colour, bool replaceContents) const
    {
        Image::BitmapData destData (image, Image::BitmapData::readWrite);

        switch (destData.pixelFormat)
        {
            case Image::ARGB:   EdgeTableFillers::renderSolidFill (iter, destData, colour, replaceContents, (PixelARGB*) nullptr); break;
            case Image::RGB:    EdgeTableFillers::renderSolidFill (iter, destData, colour, replaceContents, (PixelRGB*) nullptr); break;
            case Image::SingleChannel:
            case Image::UnknownFormat:
            default:            EdgeTableFillers::renderSolidFill (iter, destData, colour, replaceContents, (PixelAlpha*) nullptr); break;
        }
    }

    template <typename IteratorType>
    void fillWithGradient (IteratorType& iter, ColourGradient& gradient, const AffineTransform& trans, bool isIdentity) const
    {
        HeapBlock<PixelARGB> lookupTable;
        auto numLookupEntries = gradient.createLookupTable (trans, lookupTable);
        jassert (numLookupEntries > 0);

        Image::BitmapData destData (image, Image::BitmapData::readWrite);

        switch (destData.pixelFormat)
        {
            case Image::ARGB:   EdgeTableFillers::renderGradient (iter, destData, gradient, trans, lookupTable, numLookupEntries, isIdentity, (PixelARGB*) nullptr); break;
            case Image::RGB:    EdgeTableFillers::renderGradient (iter, destData, gradient, trans, lookupTable, numLookupEntries, isIdentity, (PixelRGB*) nullptr); break;
            case Image::SingleChannel:
            case Image::UnknownFormat:
            default:            EdgeTableFillers::renderGradient (iter, destData, gradient, trans, lookupTable, numLookupEntries, isIdentity, (PixelAlpha*) nullptr); break;
        }
    }

    //==============================================================================
    Image image;
    Font font { FontOptions{} };

private:
    SoftwareRendererSavedState& operator= (const SoftwareRendererSavedState&) = delete;
};

//==============================================================================
template <class StateObjectType>
class SavedStateStack
{
public:
    SavedStateStack (StateObjectType* initialState) noexcept
        : currentState (initialState)
    {}

    SavedStateStack() = default;

    void initialise (StateObjectType* state)
    {
        currentState.reset (state);
    }

    inline StateObjectType* operator->() const noexcept     { return currentState.get(); }
    inline StateObjectType& operator*()  const noexcept     { return *currentState; }

    void save()
    {
        stack.add (new StateObjectType (*currentState));
    }

    void restore()
    {
        if (auto* top = stack.getLast())
        {
            currentState.reset (top);
            stack.removeLast (1, false);
        }
        else
        {
            jassertfalse; // trying to pop with an empty stack!
        }
    }

    void beginTransparencyLayer (float opacity)
    {
        save();
        currentState = currentState->beginTransparencyLayer (opacity);
    }

    void endTransparencyLayer()
    {
        auto finishedTransparencyLayer = std::move (currentState);
        restore();
        currentState->endTransparencyLayer (*finishedTransparencyLayer);
    }

private:
    std::unique_ptr<StateObjectType> currentState;
    OwnedArray<StateObjectType> stack;

    JUCE_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR (SavedStateStack)
};

//==============================================================================
template <class SavedStateType>
class StackBasedLowLevelGraphicsContext  : public LowLevelGraphicsContext
{
public:
    explicit StackBasedLowLevelGraphicsContext (uint64_t frameIn)
        : frame (frameIn)
    {
    }

    bool isVectorDevice()                                              const override { return false; }
    Rectangle<int> getClipBounds()                                     const override { return stack->getClipBounds(); }
    bool isClipEmpty()                                                 const override { return stack->clip == nullptr; }

    void setOrigin (Point<int> o)                                            override { stack->transform.setOrigin (o); }
    void addTransform (const AffineTransform& t)                             override { stack->transform.addTransform (t); }
    float getPhysicalPixelScaleFactor() const                                override { return stack->transform.getPhysicalPixelScaleFactor(); }
    bool clipRegionIntersects (const Rectangle<int>& r)                      override { return stack->clipRegionIntersects (r); }
    bool clipToRectangle (const Rectangle<int>& r)                           override { return stack->clipToRectangle (r); }
    bool clipToRectangleList (const RectangleList<int>& r)                   override { return stack->clipToRectangleList (r); }
    void excludeClipRectangle (const Rectangle<int>& r)                      override { stack->excludeClipRectangle (r); }
    void clipToPath (const Path& path, const AffineTransform& t)             override { stack->clipToPath (path, t); }
    void clipToImageAlpha (const Image& im, const AffineTransform& t)        override { stack->clipToImageAlpha (im, t); }
    void saveState()                                                         override { stack.save(); }
    void restoreState()                                                      override { stack.restore(); }
    void beginTransparencyLayer (float opacity)                              override { stack.beginTransparencyLayer (opacity); }
    void endTransparencyLayer()                                              override { stack.endTransparencyLayer(); }
    void setFill (const FillType& fillType)                                  override { stack->setFillType (fillType); }
    void setOpacity (float newOpacity)                                       override { stack->fillType.setOpacity (newOpacity); }
    void setInterpolationQuality (Graphics::ResamplingQuality quality)       override { stack->interpolationQuality = quality; }
    void fillRect (const Rectangle<int>& r, bool replace)                    override { stack->fillRect (r, replace); }
    void fillRect (const Rectangle<float>& r)                                override { stack->fillRect (r); }
    void fillRectList (const RectangleList<float>& list)                     override { stack->fillRectList (list); }
    void fillPath (const Path& path, const AffineTransform& t)               override { stack->fillPath (path, t); }
    void drawImage (const Image& im, const AffineTransform& t)               override { stack->drawImage (im, t); }
    void drawLine (const Line<float>& line)                                  override { stack->drawLine (line); }
    void setFont (const Font& newFont)                                       override { stack->font = newFont; }
    const Font& getFont()                                                    override { return stack->font; }
    uint64_t getFrameId()                                              const override { return frame; }

    void drawGlyphs (Span<const uint16_t> glyphs,
                     Span<const Point<float>> positions,
                     const AffineTransform& t) override
    {
        jassert (glyphs.size() == positions.size());

        for (const auto [index, glyph] : enumerate (glyphs))
            drawGlyph (glyph, AffineTransform::translation (positions[(size_t) index]).followedBy (t));
    }

protected:
    void drawGlyph (uint16_t i, const AffineTransform& t)
    {
        if (stack->clip == nullptr)
            return;

        const auto [layers, drawPosition] = [&]
        {
            if (t.isOnlyTranslation() && ! stack->transform.isRotated)
            {
                auto& cache = RenderingHelpers::GlyphCache::getInstance();
                const Point pos (t.getTranslationX(), t.getTranslationY());

                if (this->stack->transform.isOnlyTranslated)
                {
                    const auto drawPos = pos + stack->transform.offset.toFloat();
                    return std::tuple (cache.get (stack->font, i), drawPos);
                }

                auto f = stack->font;
                f.setHeight (f.getHeight() * stack->transform.complexTransform.mat11);

                auto xScale = stack->transform.complexTransform.mat00 / stack->transform.complexTransform.mat11;

                if (std::abs (xScale - 1.0f) > 0.01f)
                    f.setHorizontalScale (xScale);

                const auto drawPos = stack->transform.transformed (pos);
                return std::tuple (cache.get (f, i), drawPos);
            }

            const auto fontHeight = detail::FontRendering::getEffectiveHeight (stack->font);
            const auto fontTransform = AffineTransform::scale (fontHeight * stack->font.getHorizontalScale(),
                                                               fontHeight).followedBy (t);
            const auto fullTransform = stack->transform.getTransformWith (fontTransform);
            return std::tuple (stack->font.getTypefacePtr()->getLayersForGlyph (stack->font.getMetricsKind(), i, fullTransform), Point<float>{});
        }();

        const auto initialFill = stack->fillType;
        const ScopeGuard scope { [&] { this->stack->setFillType (initialFill); } };

        for (const auto& layer : layers)
        {
            if (auto* colourLayer = std::get_if<ColourLayer> (&layer.layer))
            {
                if (auto fill = colourLayer->colour)
                    stack->setFillType (*fill);

                stack->fillEdgeTable (colourLayer->clip, drawPosition.x, roundToInt (drawPosition.y));
            }
            else if (auto* imageLayer = std::get_if<ImageLayer> (&layer.layer))
            {
                // The position arguments to fillEdgeTable are in physical screen-space,
                // and do not take the current context transform into account.
                // However, drawImage *does* apply the context transform internally.
                // We apply the inverse context transform here so that after the
                // real context transform is applied, the image will be painted at the
                // physical position specified by drawPosition.
                const auto imageTransform = imageLayer->transform.translated (drawPosition)
                                                                 .followedBy (stack->transform.getTransform().inverted());
                stack->drawImage (imageLayer->image, imageTransform);
            }
        }
    }

    explicit StackBasedLowLevelGraphicsContext (SavedStateType* initialState) : stack (initialState) {}
    StackBasedLowLevelGraphicsContext() = default;

    RenderingHelpers::SavedStateStack<SavedStateType> stack;
    uint64_t frame = 0;
};

JUCE_END_IGNORE_WARNINGS_MSVC

} // namespace juce::RenderingHelpers
