| /* |
| * 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 "SkRasterPipeline.h" |
| |
| SkRasterPipeline::SkRasterPipeline(SkArenaAlloc* alloc) : fAlloc(alloc) { |
| this->reset(); |
| } |
| void SkRasterPipeline::reset() { |
| fStages = nullptr; |
| fSlotsNeeded = 1; // We always need one extra slot for just_return(). |
| } |
| |
| void SkRasterPipeline::append(StockStage stage, void* ctx) { |
| SkASSERT(stage != from_srgb); |
| this->unchecked_append(stage, ctx); |
| } |
| void SkRasterPipeline::unchecked_append(StockStage stage, void* ctx) { |
| fStages = fAlloc->make<StageList>( StageList{fStages, stage, ctx} ); |
| fSlotsNeeded += ctx ? 2 : 1; |
| } |
| |
| void SkRasterPipeline::extend(const SkRasterPipeline& src) { |
| this->extend(src.fStages); |
| } |
| void SkRasterPipeline::extend(const StageList* stages) { |
| if (!stages) { |
| return; |
| } |
| this->extend(stages->prev); |
| this->unchecked_append(stages->stage, stages->ctx); |
| } |
| |
| void SkRasterPipeline::dump() const { |
| SkDebugf("SkRasterPipeline, (in reverse)\n"); |
| for (auto st = fStages; st; st = st->prev) { |
| const char* name = ""; |
| switch (st->stage) { |
| #define M(x) case x: name = #x; break; |
| SK_RASTER_PIPELINE_STAGES(M) |
| #undef M |
| } |
| SkDebugf("\t%s\n", name); |
| } |
| SkDebugf("\n"); |
| } |
| |
| // It's pretty easy to start with sound premultiplied linear floats, pack those |
| // to sRGB encoded bytes, then read them back to linear floats and find them not |
| // quite premultiplied, with a color channel just a smidge greater than the alpha |
| // channel. This can happen basically any time we have different transfer |
| // functions for alpha and colors... sRGB being the only one we draw into. |
| |
| // This is an annoying problem with no known good solution. So apply the clamp hammer. |
| |
| void SkRasterPipeline::append_from_srgb(SkAlphaType at) { |
| this->unchecked_append(from_srgb, nullptr); |
| if (at == kPremul_SkAlphaType) { |
| this->append(SkRasterPipeline::clamp_a); |
| } |
| } |