bool willUseFilterColor() const {
SkXfermode::Coeff dstCoeff;
SkXfermode::Coeff srcCoeff;
SkAssertResult(SkXfermode::ModeAsCoeff(fMode, &srcCoeff, &dstCoeff));
if (SkXfermode::kZero_Coeff == srcCoeff) {
return GrBlendCoeffRefsSrc(sk_blend_to_grblend(dstCoeff));
}
return true;
}
void ModeColorFilterEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const {
float inputColor[4];
GrColorToRGBAFloat(inout->color(), inputColor);
float filterColor[4];
GrColorToRGBAFloat(fColor, filterColor);
MaskedColorExpr result =
color_filter_expression(fMode,
MaskedColorExpr(filterColor, kRGBA_GrColorComponentFlags),
MaskedColorExpr(inputColor, inout->validFlags()));
// Check if we will use the input color
SkXfermode::Coeff dstCoeff;
SkXfermode::Coeff srcCoeff;
SkAssertResult(SkXfermode::ModeAsCoeff(fMode, &srcCoeff, &dstCoeff));
GrInvariantOutput::ReadInput readInput = GrInvariantOutput::kWill_ReadInput;
// These could be calculated from the blend equation with template trickery..
if (SkXfermode::kZero_Coeff == dstCoeff &&
!GrBlendCoeffRefsDst(sk_blend_to_grblend(srcCoeff))) {
readInput = GrInvariantOutput::kWillNot_ReadInput;
}
inout->setToOther(result.getValidComponents(), result.getColor(), readInput);
}
bool SkXfermodeImageFilter::filterImageGPU(Proxy* proxy,
const SkBitmap& src,
const SkMatrix& ctm,
SkBitmap* result,
SkIPoint* offset) {
SkBitmap background;
SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, ctm, &background,
&backgroundOffset)) {
return false;
}
GrTexture* backgroundTex = background.getTexture();
SkBitmap foreground;
SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
if (!SkImageFilterUtils::GetInputResultGPU(getInput(1), proxy, src, ctm, &foreground,
&foregroundOffset)) {
return false;
}
GrTexture* foregroundTex = foreground.getTexture();
GrContext* context = foregroundTex->getContext();
GrEffectRef* xferEffect = NULL;
GrTextureDesc desc;
desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
desc.fWidth = src.width();
desc.fHeight = src.height();
desc.fConfig = kSkia8888_GrPixelConfig;
GrAutoScratchTexture ast(context, desc);
SkAutoTUnref<GrTexture> dst(ast.detach());
GrContext::AutoRenderTarget art(context, dst->asRenderTarget());
SkXfermode::Coeff sm, dm;
if (!SkXfermode::AsNewEffectOrCoeff(fMode, &xferEffect, &sm, &dm, backgroundTex)) {
return false;
}
SkMatrix foregroundMatrix = GrEffect::MakeDivByTextureWHMatrix(foregroundTex);
foregroundMatrix.preTranslate(SkIntToScalar(backgroundOffset.fX-foregroundOffset.fX),
SkIntToScalar(backgroundOffset.fY-foregroundOffset.fY));
SkRect srcRect;
src.getBounds(&srcRect);
if (NULL != xferEffect) {
GrPaint paint;
paint.addColorTextureEffect(foregroundTex, foregroundMatrix);
paint.addColorEffect(xferEffect)->unref();
context->drawRect(paint, srcRect);
} else {
GrPaint backgroundPaint;
SkMatrix backgroundMatrix = GrEffect::MakeDivByTextureWHMatrix(backgroundTex);
backgroundPaint.addColorTextureEffect(backgroundTex, backgroundMatrix);
context->drawRect(backgroundPaint, srcRect);
GrPaint foregroundPaint;
foregroundPaint.setBlendFunc(sk_blend_to_grblend(sm), sk_blend_to_grblend(dm));
foregroundPaint.addColorTextureEffect(foregroundTex, foregroundMatrix);
context->drawRect(foregroundPaint, srcRect);
}
offset->fX += backgroundOffset.fX;
offset->fY += backgroundOffset.fY;
return SkImageFilterUtils::WrapTexture(dst, src.width(), src.height(), result);
}
