| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "SkArenaAlloc.h" |
| #include "SkOverdrawColorFilter.h" |
| #include "SkPM4f.h" |
| #include "SkRasterPipeline.h" |
| #include "SkReadBuffer.h" |
| #include "../jumper/SkJumper.h" |
| |
| #if SK_SUPPORT_GPU |
| #include "effects/GrSkSLFP.h" |
| |
| GR_FP_SRC_STRING SKSL_OVERDRAW_SRC = R"( |
| layout(ctype=SkPMColor) in uniform half4 color0; |
| layout(ctype=SkPMColor) in uniform half4 color1; |
| layout(ctype=SkPMColor) in uniform half4 color2; |
| layout(ctype=SkPMColor) in uniform half4 color3; |
| layout(ctype=SkPMColor) in uniform half4 color4; |
| layout(ctype=SkPMColor) in uniform half4 color5; |
| |
| void main(int x, int y, inout half4 color) { |
| half alpha = 255.0 * color.a; |
| if (alpha < 0.5) { |
| color = color0; |
| } else if (alpha < 1.5) { |
| color = color1; |
| } else if (alpha < 2.5) { |
| color = color2; |
| } else if (alpha < 3.5) { |
| color = color3; |
| } else if (alpha < 4.5) { |
| color = color4; |
| } else { |
| color = color5; |
| } |
| } |
| )"; |
| #endif |
| |
| void SkOverdrawColorFilter::onAppendStages(SkRasterPipeline* p, |
| SkColorSpace* dstCS, |
| SkArenaAlloc* alloc, |
| bool shader_is_opaque) const { |
| struct Ctx : public SkJumper_CallbackCtx { |
| const SkPMColor* colors; |
| }; |
| // TODO: do we care about transforming to dstCS? |
| auto ctx = alloc->make<Ctx>(); |
| ctx->colors = fColors; |
| ctx->fn = [](SkJumper_CallbackCtx* arg, int active_pixels) { |
| auto ctx = (Ctx*)arg; |
| auto pixels = (SkPM4f*)ctx->rgba; |
| for (int i = 0; i < active_pixels; i++) { |
| uint8_t alpha = (int)(pixels[i].a() * 255); |
| if (alpha >= kNumColors) { |
| alpha = kNumColors - 1; |
| } |
| pixels[i] = SkPM4f::FromPMColor(ctx->colors[alpha]); |
| } |
| }; |
| p->append(SkRasterPipeline::callback, ctx); |
| } |
| |
| void SkOverdrawColorFilter::flatten(SkWriteBuffer& buffer) const { |
| buffer.writeByteArray(fColors, kNumColors * sizeof(SkPMColor)); |
| } |
| |
| sk_sp<SkFlattenable> SkOverdrawColorFilter::CreateProc(SkReadBuffer& buffer) { |
| SkPMColor colors[kNumColors]; |
| size_t size = buffer.getArrayCount(); |
| if (!buffer.validate(size == sizeof(colors))) { |
| return nullptr; |
| } |
| if (!buffer.readByteArray(colors, sizeof(colors))) { |
| return nullptr; |
| } |
| |
| return SkOverdrawColorFilter::Make(colors); |
| } |
| |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkOverdrawColorFilter) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkOverdrawColorFilter) |
| SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END |
| #if SK_SUPPORT_GPU |
| |
| std::unique_ptr<GrFragmentProcessor> SkOverdrawColorFilter::asFragmentProcessor( |
| GrContext* context, const GrColorSpaceInfo&) const { |
| static int overdrawIndex = GrSkSLFP::NewIndex(); |
| return GrSkSLFP::Make(context, overdrawIndex, "Overdraw", SKSL_OVERDRAW_SRC, fColors, |
| sizeof(fColors)); |
| } |
| |
| #endif |