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flesh out blendmodes through Screen

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Cq-Include-Trybots: skia.primary:Test-Debian9-Clang-GCE-CPU-AVX2-x86_64-Debug-All-SK_USE_SKVM_BLITTER
Change-Id: I7a573d8991a41020bfaf72fe1fe231ee1da92535
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/253196
Commit-Queue: Mike Reed <reed@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
This commit is contained in:
Mike Reed 2019-11-07 11:53:38 -05:00 committed by Skia Commit-Bot
parent 9c990faa58
commit 4edb719f1b
2 changed files with 76 additions and 10 deletions
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84
src/core/SkVMBlitter.cpp
View File

@ -550,22 +550,28 @@ namespace {
} // namespace
bool skvm::BlendModeSupported(SkBlendMode mode) {
switch (mode) {
default: break;
case SkBlendMode::kSrc:
case SkBlendMode::kSrcOver: return true;
}
return false;
return mode <= SkBlendMode::kScreen;
}
skvm::Color skvm::BlendModeProgram(skvm::Builder* p, SkBlendMode mode, const skvm::Color& src,
const skvm::Color& dst) {
skvm::Color skvm::BlendModeProgram(skvm::Builder* p, SkBlendMode mode, skvm::Color src,
skvm::Color dst) {
auto mma_d255 = [p](skvm::I32 a, skvm::I32 b, skvm::I32 c, skvm::I32 d) {
return p->div255(p->add(p->mul(a, b), p->mul(c, d)));
};
skvm::Color res;
switch (mode) {
default: SkASSERT(false);
case SkBlendMode::kSrc: res = src; break;
case SkBlendMode::kClear: {
auto zero = p->splat(0);
res = {zero, zero, zero, zero};
} break;
case SkBlendMode::kSrc: res = src; break;
case SkBlendMode::kDst: res = dst; break;
case SkBlendMode::kDstOver: std::swap(src, dst); // fall-through
case SkBlendMode::kSrcOver: {
auto invA = p->sub(p->splat(255), src.a);
res.r = p->add(src.r, p->scale_unorm8(dst.r, invA));
@ -573,6 +579,66 @@ skvm::Color skvm::BlendModeProgram(skvm::Builder* p, SkBlendMode mode, const skv
res.b = p->add(src.b, p->scale_unorm8(dst.b, invA));
res.a = p->add(src.a, p->scale_unorm8(dst.a, invA));
} break;
case SkBlendMode::kDstIn: std::swap(src, dst); // fall-through
case SkBlendMode::kSrcIn: {
res.r = p->scale_unorm8(src.r, dst.a);
res.g = p->scale_unorm8(src.g, dst.a);
res.b = p->scale_unorm8(src.b, dst.a);
res.a = p->scale_unorm8(src.a, dst.a);
} break;
case SkBlendMode::kDstOut: std::swap(src, dst); // fall-through
case SkBlendMode::kSrcOut: {
auto invA = p->sub(p->splat(255), dst.a);
res.r = p->scale_unorm8(src.r, invA);
res.g = p->scale_unorm8(src.g, invA);
res.b = p->scale_unorm8(src.b, invA);
res.a = p->scale_unorm8(src.a, invA);
} break;
case SkBlendMode::kDstATop: std::swap(src, dst); // fall-through
case SkBlendMode::kSrcATop: {
auto invsa = p->sub(p->splat(255), src.a);
res.r = mma_d255(src.r, dst.a, dst.r, invsa);
res.g = mma_d255(src.g, dst.a, dst.g, invsa);
res.b = mma_d255(src.b, dst.a, dst.b, invsa);
res.a = mma_d255(src.a, dst.a, dst.a, invsa);
} break;
case SkBlendMode::kXor: {
auto invsa = p->sub(p->splat(255), src.a);
auto invda = p->sub(p->splat(255), dst.a);
res.r = mma_d255(src.r, invda, dst.r, invsa);
res.g = mma_d255(src.g, invda, dst.g, invsa);
res.b = mma_d255(src.b, invda, dst.b, invsa);
res.a = mma_d255(src.a, invda, dst.a, invsa);
} break;
case SkBlendMode::kPlus: {
auto max = p->splat(255);
res.r = p->min(p->add(src.r, dst.r), max);
res.g = p->min(p->add(src.g, dst.g), max);
res.b = p->min(p->add(src.b, dst.b), max);
res.a = p->min(p->add(src.a, dst.a), max);
} break;
case SkBlendMode::kModulate: {
res.r = p->scale_unorm8(src.r, dst.r);
res.g = p->scale_unorm8(src.g, dst.g);
res.b = p->scale_unorm8(src.b, dst.b);
res.a = p->scale_unorm8(src.a, dst.a);
} break;
case SkBlendMode::kScreen: {
auto add_sub = [p](skvm::I32 a, skvm::I32 b, skvm::I32 c) {
return p->sub(p->add(a, b), c);
};
res.r = add_sub(src.r, dst.r, p->scale_unorm8(src.r, dst.r));
res.g = add_sub(src.g, dst.g, p->scale_unorm8(src.g, dst.g));
res.b = add_sub(src.b, dst.b, p->scale_unorm8(src.b, dst.b));
res.a = add_sub(src.a, dst.a, p->scale_unorm8(src.a, dst.a));
} break;
}
return res;
}

2
src/core/SkVMBlitter.h
View File

@ -15,7 +15,7 @@ namespace skvm {
struct Color { skvm::I32 r,g,b,a; };
bool BlendModeSupported(SkBlendMode);
Color BlendModeProgram(Builder*, SkBlendMode, const Color& src, const Color& dst);
Color BlendModeProgram(Builder*, SkBlendMode, Color src, Color dst);
}
#endif