Function processImageOperation

source/core/StarImageProcessing.cpp:376–589

void processImageOperation(ImageOperation const& operation, Image& image, ImageReferenceCallback refCallback) {
  if (image.bytesPerPixel() == 3) {
    // Convert to an image format that has alpha so certain operations function properly
    image = image.convert(image.pixelFormat() == PixelFormat::BGR24 ? PixelFormat::BGRA32 : PixelFormat::RGBA32);
  }
  if (auto op = operation.ptr<HueShiftImageOperation>()) {
    image.forEachPixel([&op](unsigned, unsigned, Vec4B& pixel) {
      if (pixel[3] != 0)
        pixel = Color::hueShiftVec4B(pixel, op->hueShiftAmount);
    });
  } else if (auto op = operation.ptr<SaturationShiftImageOperation>()) {
    processSaturationShift(image, op);
  } else if (auto op = operation.ptr<BrightnessMultiplyImageOperation>()) {
    image.forEachPixel([&op](unsigned, unsigned, Vec4B& pixel) {
      if (pixel[3] != 0) {
        Color color = Color::rgba(pixel);
        color.setValue(clamp(color.value() * op->brightnessMultiply, 0.0f, 1.0f));
        pixel = color.toRgba();
      }
    });
  } else if (auto op = operation.ptr<FadeToColorImageOperation>()) {
    image.forEachPixel([&op](unsigned, unsigned, Vec4B& pixel) {
      pixel[0] = op->rTable[pixel[0]];
      pixel[1] = op->gTable[pixel[1]];
      pixel[2] = op->bTable[pixel[2]];
    });
  } else if (auto op = operation.ptr<ScanLinesImageOperation>()) {
    image.forEachPixel([&op](unsigned, unsigned y, Vec4B& pixel) {
      if (y % 2 == 0) {
        pixel[0] = op->fade1.rTable[pixel[0]];
        pixel[1] = op->fade1.gTable[pixel[1]];
        pixel[2] = op->fade1.bTable[pixel[2]];
      } else {
        pixel[0] = op->fade2.rTable[pixel[0]];
        pixel[1] = op->fade2.gTable[pixel[1]];
        pixel[2] = op->fade2.bTable[pixel[2]];
      }
    });
  } else if (auto op = operation.ptr<SetColorImageOperation>()) {
    image.forEachPixel([&op](unsigned, unsigned, Vec4B& pixel) {
      pixel[0] = op->color[0];
      pixel[1] = op->color[1];
      pixel[2] = op->color[2];
    });
  } else if (auto op = operation.ptr<ColorReplaceImageOperation>()) {
    image.forEachPixel([&op](unsigned, unsigned, Vec4B& pixel) {
      if (auto m = op->colorReplaceMap.maybe(pixel))
        pixel = *m;
    });

  } else if (auto op = operation.ptr<AlphaMaskImageOperation>()) {
    if (op->maskImages.empty())
      return;

    if (!refCallback)
      throw StarException("Missing image ref callback during AlphaMaskImageOperation in ImageProcessor::process");

    List<Image const*> maskImages;