blob: 671c2fbe2b7ae236bb74e0292468c21a9e18f7e7 [file] [log] [blame]
* Copyright 2011 Google Inc.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
#include "include/core/SkAlphaType.h"
#include "include/core/SkBlendMode.h"
#include "include/core/SkCanvas.h"
#include "include/core/SkColor.h"
#include "include/core/SkColorFilter.h"
#include "include/core/SkColorSpace.h"
#include "include/core/SkImageInfo.h"
#include "include/core/SkPaint.h"
#include "include/core/SkPoint.h"
#include "include/core/SkRefCnt.h"
#include "include/core/SkSurface.h"
#include "include/core/SkTileMode.h"
#include "include/core/SkTypes.h"
#include "include/effects/SkColorMatrix.h" // IWYU pragma: keep
#include "include/effects/SkGradientShader.h"
#include "include/gpu/GpuTypes.h"
#include "include/gpu/GrDirectContext.h"
#include "src/base/SkAutoMalloc.h"
#include "src/base/SkRandom.h"
#include "src/core/SkColorFilterBase.h"
#include "src/core/SkColorFilterPriv.h"
#include "src/core/SkReadBuffer.h"
#include "src/core/SkVM.h"
#include "src/core/SkWriteBuffer.h"
#include "tests/CtsEnforcement.h"
#include "tests/Test.h"
#include <cstddef>
#include <utility>
class SkArenaAlloc;
class SkFlattenable;
struct GrContextOptions;
struct SkStageRec;
static sk_sp<SkColorFilter> reincarnate_colorfilter(SkFlattenable* obj) {
SkBinaryWriteBuffer wb;
size_t size = wb.bytesWritten();
SkAutoSMalloc<1024> storage(size);
// make a copy into storage
SkReadBuffer rb(storage.get(), size);
return rb.readColorFilter();
#define ILLEGAL_MODE ((SkBlendMode)-1)
DEF_TEST(ColorFilter, reporter) {
SkRandom rand;
for (int mode = 0; mode < kSkBlendModeCount; mode++) {
SkColor color = rand.nextU();
// ensure we always get a filter, by avoiding the possibility of a
// special case that would return nullptr (if color's alpha is 0 or 0xFF)
color = SkColorSetA(color, 0x7F);
auto cf = SkColorFilters::Blend(color, (SkBlendMode)mode);
// allow for no filter if we're in Dst mode (its a no op)
if (SkBlendMode::kDst == (SkBlendMode)mode && nullptr == cf) {
REPORTER_ASSERT(reporter, cf);
SkColor c = ~color;
SkBlendMode m = ILLEGAL_MODE;
SkColor expectedColor = color;
SkBlendMode expectedMode = (SkBlendMode)mode;
// SkDebugf("--- mc [%d %x] ", mode, color);
REPORTER_ASSERT(reporter, cf->asAColorMode(&c, (SkBlendMode*)&m));
// handle special-case folding by the factory
if (SkBlendMode::kClear == (SkBlendMode)mode) {
if (c != expectedColor) {
expectedColor = 0;
if (m != expectedMode) {
expectedMode = SkBlendMode::kSrc;
// SkDebugf("--- got [%d %x] expected [%d %x]\n", m, c, expectedMode, expectedColor);
REPORTER_ASSERT(reporter, c == expectedColor);
REPORTER_ASSERT(reporter, m == expectedMode);
auto cf2 = reincarnate_colorfilter(cf.get());
REPORTER_ASSERT(reporter, cf2);
SkColor c2 = ~color;
SkBlendMode m2 = ILLEGAL_MODE;
REPORTER_ASSERT(reporter, cf2->asAColorMode(&c2, (SkBlendMode*)&m2));
REPORTER_ASSERT(reporter, c2 == expectedColor);
REPORTER_ASSERT(reporter, m2 == expectedMode);
DEF_TEST(WorkingFormatFilterFlags, r) {
// A matrix with final row 0,0,0,1,0 shouldn't change alpha.
sk_sp<SkColorFilter> cf = SkColorFilters::Matrix({1,0,0,0,0,
REPORTER_ASSERT(r, cf->isAlphaUnchanged());
// No working format change will itself change alpha.
SkAlphaType unpremul = kUnpremul_SkAlphaType;
cf = SkColorFilterPriv::WithWorkingFormat(std::move(cf),
REPORTER_ASSERT(r, cf->isAlphaUnchanged());
// Here's a matrix that definitely does change alpha.
sk_sp<SkColorFilter> cf = SkColorFilters::Matrix({1,0,0,0,0,
REPORTER_ASSERT(r, !cf->isAlphaUnchanged());
SkAlphaType unpremul = kUnpremul_SkAlphaType;
cf = SkColorFilterPriv::WithWorkingFormat(std::move(cf),
REPORTER_ASSERT(r, !cf->isAlphaUnchanged());
struct FailureColorFilter final : public SkColorFilterBase {
skvm::Color onProgram(skvm::Builder*,
skvm::Color c,
const SkColorInfo&,
SkArenaAlloc*) const override {
return {};
bool appendStages(const SkStageRec&, bool) const override { return false; }
// Only created here, should never be flattened / unflattened.
Factory getFactory() const override { return nullptr; }
const char* getTypeName() const override { return "FailureColorFilter"; }
CtsEnforcement::kApiLevel_T) {
SkImageInfo info = SkImageInfo::MakeN32Premul(8, 8);
auto surface = SkSurface::MakeRenderTarget(ctxInfo.directContext(), skgpu::Budgeted::kNo, info);
SkPaint paint;
// Install a non-trivial shader, so the color filter isn't just applied to the paint color:
const SkPoint pts[] = {{0, 0}, {100, 100}};
const SkColor colors[] = {SK_ColorWHITE, SK_ColorBLACK};
paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2, SkTileMode::kClamp));
// Our inner (first) color filter does a "blend" (kSrc) against green, *discarding* the input:
auto inner = SkColorFilters::Blend(SK_ColorGREEN, SkBlendMode::kSrc);
// The outer (second) color filter then fails to generate an FP. There are ways to do this with
// the public API, (eg: image shader with a non-invertible local matrix, wrapped in a runtime
// color filter). That's significant boilerplate, so we use a helpful "always fail" filter:
auto outer = sk_make_sp<FailureColorFilter>();
// At one time, this would trigger a use-after-free / crash, when converting the paint to FPs: