283 lines
16 KiB
C++
283 lines
16 KiB
C++
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/*==============================================================================
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Copyright 2018 by Roland Rabien
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For more information visit www.rabiensoftware.com
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==============================================================================*/
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inline uint8 channelBlendNormal (int A, int) { return ((uint8)(A)); }
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inline uint8 channelBlendLighten (int A, int B) { return ((uint8)((B > A) ? B : A)); }
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inline uint8 channelBlendDarken (int A, int B) { return ((uint8)((B > A) ? A : B)); }
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inline uint8 channelBlendMultiply (int A, int B) { return ((uint8)((A * B) / 255)); }
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inline uint8 channelBlendAverage (int A, int B) { return ((uint8)((A + B) / 2)); }
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inline uint8 channelBlendAdd (int A, int B) { return ((uint8)(jmin (255, (A + B)))); }
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inline uint8 channelBlendSubtract (int A, int B) { return ((uint8)((A + B < 255) ? 0 : (A + B - 255))); }
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inline uint8 channelBlendDifference (int A, int B) { return ((uint8)(std::abs (A - B))); }
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inline uint8 channelBlendNegation (int A, int B) { return ((uint8)(255 - std::abs (255 - A - B))); }
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inline uint8 channelBlendScreen (int A, int B) { return ((uint8)(255 - (((255 - A) * (255 - B)) >> 8))); }
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inline uint8 channelBlendExclusion (int A, int B) { return ((uint8)(A + B - 2 * A * B / 255)); }
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inline uint8 channelBlendOverlay (int A, int B) { return ((uint8)((B < 128) ? (2 * A * B / 255) : (255 - 2 * (255 - A) * (255 - B) / 255))); }
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inline uint8 channelBlendSoftLight (int A, int B) { return ((uint8)((B < 128) ? (2 * ((A >> 1) + 64)) * ((float)B / 255) : (255 - (2 * (255 - ((A >> 1) + 64)) * (float)(255 - B) / 255)))); }
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inline uint8 channelBlendHardLight (int A, int B) { return (channelBlendOverlay (B,A)); }
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inline uint8 channelBlendColorDodge (int A, int B) { return ((uint8)((B == 255) ? B : jmin (255, ((A << 8 ) / (255 - B))))); }
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inline uint8 channelBlendColorBurn (int A, int B) { return ((uint8)((B == 0) ? B : jmax (0, (255 - ((255 - A) << 8 ) / B)))); }
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inline uint8 channelBlendLinearDodge (int A, int B) { return (channelBlendAdd (A, B)); }
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inline uint8 channelBlendLinearBurn (int A, int B) { return (channelBlendSubtract (A, B)); }
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inline uint8 channelBlendLinearLight (int A, int B) { return ((uint8)(B < 128) ? channelBlendLinearBurn (A,(2 * B)) : channelBlendLinearDodge (A, (2 * (B - 128)))); }
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inline uint8 channelBlendVividLight (int A, int B) { return ((uint8)(B < 128) ? channelBlendColorBurn (A,(2 * B)) : channelBlendColorDodge (A, (2 * (B - 128)))); }
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inline uint8 channelBlendPinLight (int A, int B) { return ((uint8)(B < 128) ? channelBlendDarken (A,(2 * B)) : channelBlendLighten (A, (2 * (B - 128)))); }
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inline uint8 channelBlendHardMix (int A, int B) { return ((uint8)((channelBlendVividLight (A, B) < 128) ? 0:255)); }
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inline uint8 channelBlendReflect (int A, int B) { return ((uint8)((B == 255) ? B : jmin (255, (A * A / (255 - B))))); }
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inline uint8 channelBlendGlow (int A, int B) { return (channelBlendReflect (B, A)); }
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inline uint8 channelBlendPhoenix (int A, int B) { return ((uint8)(jmin (A, B) - jmax (A, B) + 255)); }
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inline uint8 channelBlendAlpha (uint8 A, uint8 B, float O)
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{
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return ((uint8)(O * A + (1 - O) * B));
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}
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template <class T, uint8 (*F)(int, int)>
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void applyBlend (Image& dst, const Image& src, float alpha, juce::Point<int> position, ThreadPool* threadPool)
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{
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auto rcLower = Rectangle<int> (0, 0, dst.getWidth(), dst.getHeight());
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auto rcUpper = Rectangle<int> (position.x, position.y, src.getWidth(), src.getHeight());
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auto rcOverlap = rcLower.getIntersection (rcUpper);
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if (rcOverlap.isEmpty())
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return;
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int w = rcOverlap.getWidth();
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int h = rcOverlap.getHeight();
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int cropX = position.x < 0 ? -position.x : 0;
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int cropY = position.y < 0 ? -position.y : 0;
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threadPool = (w >= 256 || h >= 256) ? threadPool : nullptr;
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Image::BitmapData srcData (src, Image::BitmapData::readOnly);
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Image::BitmapData dstData (dst, Image::BitmapData::readWrite);
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multiThreadedFor<int> (0, h, 1, threadPool, [&] (int y)
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{
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uint8* pSrc = srcData.getLinePointer (cropY + y);
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uint8* pDst = dstData.getLinePointer (rcOverlap.getY() + y);
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pSrc += srcData.pixelStride * cropX;
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pDst += dstData.pixelStride * rcOverlap.getX();
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for (int x = 0; x < w; x++)
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{
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T* ac = (T*)pSrc;
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T* bc = (T*)pDst;
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uint8 ar = ac->getRed();
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uint8 ag = ac->getGreen();
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uint8 ab = ac->getBlue();
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uint8 aa = ac->getAlpha();
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uint8 br = bc->getRed();
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uint8 bg = bc->getGreen();
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uint8 bb = bc->getBlue();
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uint8 ba = bc->getAlpha();
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if (ba == 255)
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{
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float pixelAlpha = alpha * aa / 255.0f;
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br = channelBlendAlpha (F (ar, br), br, pixelAlpha);
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bg = channelBlendAlpha (F (ag, bg), bg, pixelAlpha);
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bb = channelBlendAlpha (F (ab, bb), bb, pixelAlpha);
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}
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else
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{
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float srcAlpha = alpha * aa / 255.0f;
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float dstAlpha = ba / 255.0f;
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float outAlpha = srcAlpha + dstAlpha * (1.0f - srcAlpha);
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if (outAlpha == 0.0)
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{
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br = 0;
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bg = 0;
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bb = 0;
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}
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else
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{
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uint8 r = F (ar, br);
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uint8 g = F (ag, bg);
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uint8 b = F (ab, bb);
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br = uint8 ((r * srcAlpha + br * dstAlpha * (1.0f - srcAlpha)) / outAlpha);
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bg = uint8 ((g * srcAlpha + bg * dstAlpha * (1.0f - srcAlpha)) / outAlpha);
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bb = uint8 ((b * srcAlpha + bb * dstAlpha * (1.0f - srcAlpha)) / outAlpha);
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}
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}
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bc->setARGB (ba, br, bg, bb);
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pSrc += srcData.pixelStride;
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pDst += dstData.pixelStride;
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}
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});
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}
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template <class T>
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void applyBlend (Image& dst, const Image& src, BlendMode mode, float alpha, juce::Point<int> position, ThreadPool* threadPool)
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{
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switch (mode)
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{
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case Normal: applyBlend<T, channelBlendNormal> (dst, src, alpha, position, threadPool); break;
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case Lighten: applyBlend<T, channelBlendLighten> (dst, src, alpha, position, threadPool); break;
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case Darken: applyBlend<T, channelBlendDarken> (dst, src, alpha, position, threadPool); break;
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case Multiply: applyBlend<T, channelBlendMultiply> (dst, src, alpha, position, threadPool); break;
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case Average: applyBlend<T, channelBlendAverage> (dst, src, alpha, position, threadPool); break;
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case Add: applyBlend<T, channelBlendAdd> (dst, src, alpha, position, threadPool); break;
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case Subtract: applyBlend<T, channelBlendSubtract> (dst, src, alpha, position, threadPool); break;
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case Difference: applyBlend<T, channelBlendDifference> (dst, src, alpha, position, threadPool); break;
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case Negation: applyBlend<T, channelBlendNegation> (dst, src, alpha, position, threadPool); break;
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case Screen: applyBlend<T, channelBlendScreen> (dst, src, alpha, position, threadPool); break;
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case Exclusion: applyBlend<T, channelBlendExclusion> (dst, src, alpha, position, threadPool); break;
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case Overlay: applyBlend<T, channelBlendOverlay> (dst, src, alpha, position, threadPool); break;
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case SoftLight: applyBlend<T, channelBlendSoftLight> (dst, src, alpha, position, threadPool); break;
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case HardLight: applyBlend<T, channelBlendHardLight> (dst, src, alpha, position, threadPool); break;
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case ColorDodge: applyBlend<T, channelBlendColorDodge> (dst, src, alpha, position, threadPool); break;
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case ColorBurn: applyBlend<T, channelBlendColorBurn> (dst, src, alpha, position, threadPool); break;
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case LinearDodge: applyBlend<T, channelBlendLinearDodge> (dst, src, alpha, position, threadPool); break;
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case LinearBurn: applyBlend<T, channelBlendLinearBurn> (dst, src, alpha, position, threadPool); break;
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case LinearLight: applyBlend<T, channelBlendLinearLight> (dst, src, alpha, position, threadPool); break;
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case VividLight: applyBlend<T, channelBlendVividLight> (dst, src, alpha, position, threadPool); break;
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case PinLight: applyBlend<T, channelBlendPinLight> (dst, src, alpha, position, threadPool); break;
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case HardMix: applyBlend<T, channelBlendHardMix> (dst, src, alpha, position, threadPool); break;
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case Reflect: applyBlend<T, channelBlendReflect> (dst, src, alpha, position, threadPool); break;
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case Glow: applyBlend<T, channelBlendGlow> (dst, src, alpha, position, threadPool); break;
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case Phoenix: applyBlend<T, channelBlendPhoenix> (dst, src, alpha, position, threadPool); break;
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}
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}
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void applyBlend (Image& dst, const Image& src, BlendMode mode, float alpha, juce::Point<int> position, ThreadPool* threadPool)
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{
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if (src.getFormat() != dst.getFormat())
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{
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Image copy = src.createCopy();
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copy = copy.convertedToFormat (dst.getFormat());
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if (src.getFormat() == Image::ARGB) applyBlend<PixelARGB> (dst, copy, mode, alpha, position, threadPool);
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else if (src.getFormat() == Image::RGB) applyBlend<PixelRGB> (dst, copy, mode, alpha, position, threadPool);
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else jassertfalse;
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}
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else
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{
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if (src.getFormat() == Image::ARGB) applyBlend<PixelARGB> (dst, src, mode, alpha, position, threadPool);
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else if (src.getFormat() == Image::RGB) applyBlend<PixelRGB> (dst, src, mode, alpha, position, threadPool);
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else jassertfalse;
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}
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}
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template <class T, uint8 (*F)(int, int)>
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void applyBlend (Image& dst, Colour c, ThreadPool* threadPool)
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{
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int w = dst.getWidth();
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int h = dst.getHeight();
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threadPool = (w >= 256 || h >= 256) ? threadPool : nullptr;
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Image::BitmapData dstData (dst, Image::BitmapData::readWrite);
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uint8 ar = c.getRed();
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uint8 ag = c.getGreen();
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uint8 ab = c.getBlue();
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uint8 aa = c.getAlpha();
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multiThreadedFor<int> (0, h, 1, threadPool, [&] (int y)
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{
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uint8* pDst = dstData.getLinePointer (y);
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for (int x = 0; x < w; x++)
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{
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T* bc = (T*)pDst;
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uint8 br = bc->getRed();
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uint8 bg = bc->getGreen();
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uint8 bb = bc->getBlue();
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uint8 ba = bc->getAlpha();
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if (ba == 255)
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{
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float pixelAlpha = aa / 255.0f;
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br = channelBlendAlpha (F (ar, br), br, pixelAlpha);
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bg = channelBlendAlpha (F (ag, bg), bg, pixelAlpha);
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bb = channelBlendAlpha (F (ab, bb), bb, pixelAlpha);
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}
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else
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{
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float srcAlpha = aa / 255.0f;
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float dstAlpha = ba / 255.0f;
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float outAlpha = srcAlpha + dstAlpha * (1.0f - srcAlpha);
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if (outAlpha == 0.0)
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{
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br = 0;
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bg = 0;
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bb = 0;
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}
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else
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{
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uint8 r = F (ar, br);
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uint8 g = F (ag, bg);
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uint8 b = F (ab, bb);
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br = uint8 ((r * srcAlpha + br * dstAlpha * (1.0f - srcAlpha)) / outAlpha);
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bg = uint8 ((g * srcAlpha + bg * dstAlpha * (1.0f - srcAlpha)) / outAlpha);
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bb = uint8 ((b * srcAlpha + bb * dstAlpha * (1.0f - srcAlpha)) / outAlpha);
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}
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}
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bc->setARGB (ba, br, bg, bb);
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pDst += dstData.pixelStride;
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}
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});
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}
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template <class T>
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void applyBlend (Image& dst, BlendMode mode, Colour c, ThreadPool* threadPool)
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{
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switch (mode)
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{
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case Normal: applyBlend<T, channelBlendNormal> (dst, c, threadPool); break;
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case Lighten: applyBlend<T, channelBlendLighten> (dst, c, threadPool); break;
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case Darken: applyBlend<T, channelBlendDarken> (dst, c, threadPool); break;
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case Multiply: applyBlend<T, channelBlendMultiply> (dst, c, threadPool); break;
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case Average: applyBlend<T, channelBlendAverage> (dst, c, threadPool); break;
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case Add: applyBlend<T, channelBlendAdd> (dst, c, threadPool); break;
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case Subtract: applyBlend<T, channelBlendSubtract> (dst, c, threadPool); break;
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case Difference: applyBlend<T, channelBlendDifference> (dst, c, threadPool); break;
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case Negation: applyBlend<T, channelBlendNegation> (dst, c, threadPool); break;
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case Screen: applyBlend<T, channelBlendScreen> (dst, c, threadPool); break;
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case Exclusion: applyBlend<T, channelBlendExclusion> (dst, c, threadPool); break;
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case Overlay: applyBlend<T, channelBlendOverlay> (dst, c, threadPool); break;
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case SoftLight: applyBlend<T, channelBlendSoftLight> (dst, c, threadPool); break;
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case HardLight: applyBlend<T, channelBlendHardLight> (dst, c, threadPool); break;
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case ColorDodge: applyBlend<T, channelBlendColorDodge> (dst, c, threadPool); break;
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case ColorBurn: applyBlend<T, channelBlendColorBurn> (dst, c, threadPool); break;
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case LinearDodge: applyBlend<T, channelBlendLinearDodge> (dst, c, threadPool); break;
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case LinearBurn: applyBlend<T, channelBlendLinearBurn> (dst, c, threadPool); break;
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case LinearLight: applyBlend<T, channelBlendLinearLight> (dst, c, threadPool); break;
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case VividLight: applyBlend<T, channelBlendVividLight> (dst, c, threadPool); break;
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case PinLight: applyBlend<T, channelBlendPinLight> (dst, c, threadPool); break;
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case HardMix: applyBlend<T, channelBlendHardMix> (dst, c, threadPool); break;
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case Reflect: applyBlend<T, channelBlendReflect> (dst, c, threadPool); break;
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case Glow: applyBlend<T, channelBlendGlow> (dst, c, threadPool); break;
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case Phoenix: applyBlend<T, channelBlendPhoenix> (dst, c, threadPool); break;
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}
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}
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void applyBlend (Image& dst, BlendMode mode, Colour c, ThreadPool* threadPool)
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{
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if (dst.getFormat() == Image::ARGB) applyBlend<PixelARGB> (dst, mode, c, threadPool);
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else if (dst.getFormat() == Image::RGB) applyBlend<PixelRGB> (dst, mode, c, threadPool);
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else jassertfalse;
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}
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