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- /*
- * 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/SkBlendMode.h"
- #include "include/core/SkColor.h"
- #include "include/core/SkColorFilter.h"
- #include "include/core/SkRefCnt.h"
- #include "include/core/SkTypes.h"
- #include "include/utils/SkRandom.h"
- #include "src/core/SkAutoMalloc.h"
- #include "src/core/SkReadBuffer.h"
- #include "src/core/SkWriteBuffer.h"
- #include "tests/Test.h"
- class SkFlattenable;
- static sk_sp<SkColorFilter> reincarnate_colorfilter(SkFlattenable* obj) {
- SkBinaryWriteBuffer wb;
- wb.writeFlattenable(obj);
- size_t size = wb.bytesWritten();
- SkAutoSMalloc<1024> storage(size);
- // make a copy into storage
- wb.writeToMemory(storage.get());
- SkReadBuffer rb(storage.get(), size);
- return rb.readColorFilter();
- }
- ///////////////////////////////////////////////////////////////////////////////
- static sk_sp<SkColorFilter> make_filter() {
- // pick a filter that cannot compose with itself via newComposed()
- return SkColorFilters::Blend(SK_ColorRED, SkBlendMode::kColorBurn);
- }
- static void test_composecolorfilter_limit(skiatest::Reporter* reporter) {
- // Test that CreateComposeFilter() has some finite limit (i.e. that the factory can return null)
- const int way_too_many = 100;
- auto parent(make_filter());
- for (int i = 2; i < way_too_many; ++i) {
- auto filter(make_filter());
- parent = parent->makeComposed(filter);
- if (nullptr == parent) {
- REPORTER_ASSERT(reporter, i > 2); // we need to have succeeded at least once!
- return;
- }
- }
- REPORTER_ASSERT(reporter, false); // we never saw a nullptr :(
- }
- #define ILLEGAL_MODE ((SkBlendMode)-1)
- DEF_TEST(ColorFilter, reporter) {
- SkRandom rand;
- for (int mode = 0; mode <= (int)SkBlendMode::kLastMode; 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) {
- continue;
- }
- 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);
- }
- }
- test_composecolorfilter_limit(reporter);
- }
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