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/*
* Copyright 2018 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
enum class InputMode {
kIgnore,
kModulateRGBA,
kModulateA,
kLast = kModulateA
};
layout(ctype=GrColor4f) in half4 color;
uniform half4 colorUniform;
layout(ctype=GrColor4f) half4 prevColor;
layout(key) in InputMode mode;
@optimizationFlags {
OptFlags(color, mode)
}
void main() {
@switch (mode) {
case InputMode::kIgnore:
sk_OutColor = colorUniform;
break;
case InputMode::kModulateRGBA:
sk_OutColor = sk_InColor * colorUniform;
break;
case InputMode::kModulateA:
sk_OutColor = sk_InColor.a * colorUniform;
break;
}
}
@setData(pdman) {
// We use the "illegal" color value as an uninit sentinel. With GrColor4f, the "illegal"
// color is *really* illegal (not just unpremultiplied), so this check is simple.
if (prevColor != color) {
pdman.set4fv(colorUniform, 1, color.fRGBA);
prevColor = color;
}
}
@class {
static const int kInputModeCnt = (int) InputMode::kLast + 1;
static OptimizationFlags OptFlags(GrColor4f color, InputMode mode) {
OptimizationFlags flags = kConstantOutputForConstantInput_OptimizationFlag;
if (mode != InputMode::kIgnore) {
flags |= kCompatibleWithCoverageAsAlpha_OptimizationFlag;
}
if (color.isOpaque()) {
flags |= kPreservesOpaqueInput_OptimizationFlag;
}
return flags;
}
GrColor4f constantOutputForConstantInput(GrColor4f input) const override {
switch (fMode) {
case InputMode::kIgnore:
return fColor;
case InputMode::kModulateA:
return fColor.mulByScalar(input.fRGBA[3]);
case InputMode::kModulateRGBA:
return fColor.modulate(input);
}
SK_ABORT("Unexpected mode");
return GrColor4f::TransparentBlack();
}
}
@test(d) {
GrColor4f color;
int colorPicker = d->fRandom->nextULessThan(3);
switch (colorPicker) {
case 0: {
uint32_t a = d->fRandom->nextULessThan(0x100);
uint32_t r = d->fRandom->nextULessThan(a+1);
uint32_t g = d->fRandom->nextULessThan(a+1);
uint32_t b = d->fRandom->nextULessThan(a+1);
color = GrColor4f::FromGrColor(GrColorPackRGBA(r, g, b, a));
break;
}
case 1:
color = GrColor4f::TransparentBlack();
break;
case 2:
uint32_t c = d->fRandom->nextULessThan(0x100);
color = GrColor4f::FromGrColor(c | (c << 8) | (c << 16) | (c << 24));
break;
}
InputMode mode = static_cast<InputMode>(d->fRandom->nextULessThan(kInputModeCnt));
return GrConstColorProcessor::Make(color, mode);
}
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