Add SkOverdrawColorFilter
Uses the value in the src alpha channel to choose how
to set the dst pixel.
This is a part of a multi-part change to detect and
display gpu overdraw on Android.
CQ_INCLUDE_TRYBOTS=master.client.skia.compile:Build-Ubuntu-GCC-x86_64-Debug-NoGPU-Trybot
BUG:32370375
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=5113
Change-Id: I07040929d8a46bbadd499dccec75eebef0e11d11
Reviewed-on: https://skia-review.googlesource.com/5113
Commit-Queue: Matt Sarett <msarett@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/effects/SkOverdrawColorFilter.cpp b/src/effects/SkOverdrawColorFilter.cpp
new file mode 100644
index 0000000..c3bcd0e
--- /dev/null
+++ b/src/effects/SkOverdrawColorFilter.cpp
@@ -0,0 +1,181 @@
+/*
+ * 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 "SkOverdrawColorFilter.h"
+
+void SkOverdrawColorFilter::filterSpan(const SkPMColor src[], int count, SkPMColor dst[]) const {
+ for (int x = 0; x < count; x++) {
+ uint8_t alpha = SkGetPackedA32(src[x]);
+ if (alpha >= kNumColors) {
+ alpha = kNumColors - 1;
+ }
+
+ dst[x] = fColors[alpha];
+ }
+}
+
+void SkOverdrawColorFilter::toString(SkString* str) const {
+ str->append("SkOverdrawColorFilter (");
+ for (int i = 0; i < kNumColors; i++) {
+ str->appendf("%d: %x\n", i, fColors[i]);
+ }
+ str->append(")");
+}
+
+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
+
+#include "GrFragmentProcessor.h"
+#include "GrInvariantOutput.h"
+#include "glsl/GrGLSLFragmentProcessor.h"
+#include "glsl/GrGLSLFragmentShaderBuilder.h"
+
+class OverdrawFragmentProcessor : public GrFragmentProcessor {
+public:
+ static sk_sp<GrFragmentProcessor> Make(const SkPMColor* colors);
+
+ const char* name() const override { return "Overdraw"; }
+
+private:
+ GrGLSLFragmentProcessor* onCreateGLSLInstance() const override;
+ void onGetGLSLProcessorKey(const GrGLSLCaps&, GrProcessorKeyBuilder*) const override {}
+ bool onIsEqual(const GrFragmentProcessor&) const override;
+ void onComputeInvariantOutput(GrInvariantOutput* inout) const override;
+
+ OverdrawFragmentProcessor(const GrColor4f* colors);
+
+ GrColor4f fColors[SkOverdrawColorFilter::kNumColors];
+
+ typedef GrFragmentProcessor INHERITED;
+};
+
+class GLOverdrawFragmentProcessor : public GrGLSLFragmentProcessor {
+public:
+ GLOverdrawFragmentProcessor(const GrColor4f* colors);
+
+ void emitCode(EmitArgs&) override;
+
+protected:
+ void onSetData(const GrGLSLProgramDataManager&, const GrProcessor&) override {}
+
+private:
+ GrColor4f fColors[SkOverdrawColorFilter::kNumColors];
+
+ typedef GrGLSLFragmentProcessor INHERITED;
+};
+
+sk_sp<GrFragmentProcessor> SkOverdrawColorFilter::asFragmentProcessor(GrContext*,
+ SkColorSpace*) const {
+ return OverdrawFragmentProcessor::Make(fColors);
+}
+
+sk_sp<GrFragmentProcessor> OverdrawFragmentProcessor::Make(const SkPMColor* colors) {
+ GrColor4f grColors[SkOverdrawColorFilter::kNumColors];
+ for (int i = 0; i < SkOverdrawColorFilter::kNumColors; i++) {
+ grColors[i] = GrColor4f::FromGrColor(GrColorPackRGBA(SkGetPackedR32(colors[i]),
+ SkGetPackedG32(colors[i]),
+ SkGetPackedB32(colors[i]),
+ SkGetPackedA32(colors[i])));
+ }
+
+ return sk_sp<OverdrawFragmentProcessor>(new OverdrawFragmentProcessor(grColors));
+}
+
+OverdrawFragmentProcessor::OverdrawFragmentProcessor(const GrColor4f* colors) {
+ this->initClassID<OverdrawFragmentProcessor>();
+ memcpy(fColors, colors, SkOverdrawColorFilter::kNumColors * sizeof(GrColor4f));
+}
+
+GrGLSLFragmentProcessor* OverdrawFragmentProcessor::onCreateGLSLInstance() const {
+ return new GLOverdrawFragmentProcessor(fColors);
+}
+
+bool OverdrawFragmentProcessor::onIsEqual(const GrFragmentProcessor& other) const {
+ const OverdrawFragmentProcessor& that = other.cast<OverdrawFragmentProcessor>();
+ return 0 == memcmp(fColors, that.fColors,
+ sizeof(GrColor4f) * SkOverdrawColorFilter::kNumColors);
+}
+
+void OverdrawFragmentProcessor::onComputeInvariantOutput(GrInvariantOutput* inout) const {
+ inout->invalidateComponents(kRGBA_GrColorComponentFlags, GrInvariantOutput::kWill_ReadInput);
+}
+
+GLOverdrawFragmentProcessor::GLOverdrawFragmentProcessor(const GrColor4f* colors) {
+ memcpy(fColors, colors, SkOverdrawColorFilter::kNumColors * sizeof(GrColor4f));
+}
+
+void GLOverdrawFragmentProcessor::emitCode(EmitArgs& args) {
+ GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;
+ if (nullptr == args.fInputColor) {
+ fragBuilder->codeAppendf("%s.rgba = vec4(%f, %f, %f, %f);", args.fOutputColor,
+ fColors[5].fRGBA[0],
+ fColors[5].fRGBA[1],
+ fColors[5].fRGBA[2],
+ fColors[5].fRGBA[3]);
+ } else {
+ fragBuilder->codeAppendf("float alpha = 255.0 * %s.a;", args.fInputColor);
+ fragBuilder->codeAppendf("if (alpha < 0.5) {");
+ fragBuilder->codeAppendf(" %s.rgba = vec4(%f, %f, %f, %f);", args.fOutputColor,
+ fColors[0].fRGBA[0],
+ fColors[0].fRGBA[1],
+ fColors[0].fRGBA[2],
+ fColors[0].fRGBA[3]);
+ fragBuilder->codeAppendf("} else if (alpha < 1.5) {");
+ fragBuilder->codeAppendf(" %s.rgba = vec4(%f, %f, %f, %f);", args.fOutputColor,
+ fColors[1].fRGBA[0],
+ fColors[1].fRGBA[1],
+ fColors[1].fRGBA[2],
+ fColors[1].fRGBA[3]);
+ fragBuilder->codeAppendf("} else if (alpha < 2.5) {");
+ fragBuilder->codeAppendf(" %s.rgba = vec4(%f, %f, %f, %f);", args.fOutputColor,
+ fColors[2].fRGBA[0],
+ fColors[2].fRGBA[1],
+ fColors[2].fRGBA[2],
+ fColors[2].fRGBA[3]);
+ fragBuilder->codeAppendf("} else if (alpha < 3.5) {");
+ fragBuilder->codeAppendf(" %s.rgba = vec4(%f, %f, %f, %f);", args.fOutputColor,
+ fColors[3].fRGBA[0],
+ fColors[3].fRGBA[1],
+ fColors[3].fRGBA[2],
+ fColors[3].fRGBA[3]);
+ fragBuilder->codeAppendf("} else if (alpha < 4.5) {");
+ fragBuilder->codeAppendf(" %s.rgba = vec4(%f, %f, %f, %f);", args.fOutputColor,
+ fColors[4].fRGBA[0],
+ fColors[4].fRGBA[1],
+ fColors[4].fRGBA[2],
+ fColors[4].fRGBA[3]);
+ fragBuilder->codeAppendf("} else {");
+ fragBuilder->codeAppendf(" %s.rgba = vec4(%f, %f, %f, %f);", args.fOutputColor,
+ fColors[5].fRGBA[0],
+ fColors[5].fRGBA[1],
+ fColors[5].fRGBA[2],
+ fColors[5].fRGBA[3]);
+ fragBuilder->codeAppendf("}");
+ }
+}
+
+#endif