| /* |
| * 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 "SkColor.h" |
| #include "SkColorFilter.h" |
| #include "SkColorPriv.h" |
| #include "SkLumaColorFilter.h" |
| #include "SkReadBuffer.h" |
| #include "SkWriteBuffer.h" |
| #include "SkRandom.h" |
| #include "SkXfermode.h" |
| #include "Test.h" |
| |
| static SkColorFilter* reincarnate_colorfilter(SkFlattenable* obj) { |
| SkWriteBuffer 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 SkColorFilter* make_filter() { |
| // pick a filter that cannot compose with itself via newComposed() |
| return SkColorFilter::CreateModeFilter(SK_ColorRED, SkXfermode::kColorBurn_Mode); |
| } |
| |
| 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; |
| SkAutoTUnref<SkColorFilter> parent(make_filter()); |
| for (int i = 2; i < way_too_many; ++i) { |
| SkAutoTUnref<SkColorFilter> filter(make_filter()); |
| parent.reset(SkColorFilter::CreateComposeFilter(parent, 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 ((SkXfermode::Mode)-1) |
| |
| DEF_TEST(ColorFilter, reporter) { |
| SkRandom rand; |
| |
| for (int mode = 0; mode <= SkXfermode::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); |
| |
| SkColorFilter* cf = SkColorFilter::CreateModeFilter(color, |
| (SkXfermode::Mode)mode); |
| |
| // allow for no filter if we're in Dst mode (its a no op) |
| if (SkXfermode::kDst_Mode == mode && nullptr == cf) { |
| continue; |
| } |
| |
| SkAutoUnref aur(cf); |
| REPORTER_ASSERT(reporter, cf); |
| |
| SkColor c = ~color; |
| SkXfermode::Mode m = ILLEGAL_MODE; |
| |
| SkColor expectedColor = color; |
| SkXfermode::Mode expectedMode = (SkXfermode::Mode)mode; |
| |
| // SkDebugf("--- mc [%d %x] ", mode, color); |
| |
| REPORTER_ASSERT(reporter, cf->asColorMode(&c, &m)); |
| // handle special-case folding by the factory |
| if (SkXfermode::kClear_Mode == mode) { |
| if (c != expectedColor) { |
| expectedColor = 0; |
| } |
| if (m != expectedMode) { |
| expectedMode = SkXfermode::kSrc_Mode; |
| } |
| } |
| |
| // SkDebugf("--- got [%d %x] expected [%d %x]\n", m, c, expectedMode, expectedColor); |
| |
| REPORTER_ASSERT(reporter, c == expectedColor); |
| REPORTER_ASSERT(reporter, m == expectedMode); |
| |
| { |
| SkColorFilter* cf2 = reincarnate_colorfilter(cf); |
| SkAutoUnref aur2(cf2); |
| REPORTER_ASSERT(reporter, cf2); |
| |
| SkColor c2 = ~color; |
| SkXfermode::Mode m2 = ILLEGAL_MODE; |
| REPORTER_ASSERT(reporter, cf2->asColorMode(&c2, &m2)); |
| REPORTER_ASSERT(reporter, c2 == expectedColor); |
| REPORTER_ASSERT(reporter, m2 == expectedMode); |
| } |
| } |
| |
| test_composecolorfilter_limit(reporter); |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| DEF_TEST(LumaColorFilter, reporter) { |
| SkPMColor in, out; |
| SkAutoTUnref<SkColorFilter> lf(SkLumaColorFilter::Create()); |
| |
| // Applying luma to white produces black with the same transparency. |
| for (unsigned i = 0; i < 256; ++i) { |
| in = SkPackARGB32(i, i, i, i); |
| lf->filterSpan(&in, 1, &out); |
| REPORTER_ASSERT(reporter, SkGetPackedA32(out) == i); |
| REPORTER_ASSERT(reporter, SkGetPackedR32(out) == 0); |
| REPORTER_ASSERT(reporter, SkGetPackedG32(out) == 0); |
| REPORTER_ASSERT(reporter, SkGetPackedB32(out) == 0); |
| } |
| |
| // Applying luma to black yields transparent black (luminance(black) == 0) |
| for (unsigned i = 0; i < 256; ++i) { |
| in = SkPackARGB32(i, 0, 0, 0); |
| lf->filterSpan(&in, 1, &out); |
| REPORTER_ASSERT(reporter, out == SK_ColorTRANSPARENT); |
| } |
| |
| // For general colors, a luma filter generates black with an attenuated alpha channel. |
| for (unsigned i = 1; i < 256; ++i) { |
| in = SkPackARGB32(i, i, i / 2, i / 3); |
| lf->filterSpan(&in, 1, &out); |
| REPORTER_ASSERT(reporter, out != in); |
| REPORTER_ASSERT(reporter, SkGetPackedA32(out) <= i); |
| REPORTER_ASSERT(reporter, SkGetPackedR32(out) == 0); |
| REPORTER_ASSERT(reporter, SkGetPackedG32(out) == 0); |
| REPORTER_ASSERT(reporter, SkGetPackedB32(out) == 0); |
| } |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include "SkColorMatrixFilter.h" |
| |
| static void get_brightness_matrix(float amount, float matrix[20]) { |
| // Spec implementation |
| // (http://dvcs.w3.org/hg/FXTF/raw-file/tip/filters/index.html#brightnessEquivalent) |
| // <feFunc[R|G|B] type="linear" slope="[amount]"> |
| memset(matrix, 0, 20 * sizeof(SkScalar)); |
| matrix[0] = matrix[6] = matrix[12] = amount; |
| matrix[18] = 1.f; |
| } |
| |
| static void get_grayscale_matrix(float amount, float matrix[20]) { |
| // Note, these values are computed to ensure MatrixNeedsClamping is false |
| // for amount in [0..1] |
| matrix[0] = 0.2126f + 0.7874f * amount; |
| matrix[1] = 0.7152f - 0.7152f * amount; |
| matrix[2] = 1.f - (matrix[0] + matrix[1]); |
| matrix[3] = matrix[4] = 0.f; |
| |
| matrix[5] = 0.2126f - 0.2126f * amount; |
| matrix[6] = 0.7152f + 0.2848f * amount; |
| matrix[7] = 1.f - (matrix[5] + matrix[6]); |
| matrix[8] = matrix[9] = 0.f; |
| |
| matrix[10] = 0.2126f - 0.2126f * amount; |
| matrix[11] = 0.7152f - 0.7152f * amount; |
| matrix[12] = 1.f - (matrix[10] + matrix[11]); |
| matrix[13] = matrix[14] = 0.f; |
| |
| matrix[15] = matrix[16] = matrix[17] = matrix[19] = 0.f; |
| matrix[18] = 1.f; |
| } |
| |
| static SkColorFilter* make_cf0() { |
| SkScalar matrix[20]; |
| get_brightness_matrix(0.5f, matrix); |
| return SkColorMatrixFilter::Create(matrix); |
| } |
| static SkColorFilter* make_cf1() { |
| SkScalar matrix[20]; |
| get_grayscale_matrix(1, matrix); |
| return SkColorMatrixFilter::Create(matrix); |
| } |
| static SkColorFilter* make_cf2() { |
| SkColorMatrix m0, m1; |
| get_brightness_matrix(0.5f, m0.fMat); |
| get_grayscale_matrix(1, m1.fMat); |
| m0.preConcat(m1); |
| return SkColorMatrixFilter::Create(m0); |
| } |
| static SkColorFilter* make_cf3() { |
| SkColorMatrix m0, m1; |
| get_brightness_matrix(0.5f, m0.fMat); |
| get_grayscale_matrix(1, m1.fMat); |
| m0.postConcat(m1); |
| return SkColorMatrixFilter::Create(m0); |
| } |
| typedef SkColorFilter* (*CFProc)(); |
| |
| // Test that a colormatrix that "should" preserve opaquness actually does. |
| DEF_TEST(ColorMatrixFilter, reporter) { |
| const CFProc procs[] = { |
| make_cf0, make_cf1, make_cf2, make_cf3, |
| }; |
| |
| for (size_t i = 0; i < SK_ARRAY_COUNT(procs); ++i) { |
| SkAutoTUnref<SkColorFilter> cf(procs[i]()); |
| |
| // generate all possible r,g,b triples |
| for (int r = 0; r < 256; ++r) { |
| for (int g = 0; g < 256; ++g) { |
| SkPMColor storage[256]; |
| for (int b = 0; b < 256; ++b) { |
| storage[b] = SkPackARGB32(0xFF, r, g, b); |
| } |
| cf->filterSpan(storage, 256, storage); |
| for (int b = 0; b < 256; ++b) { |
| REPORTER_ASSERT(reporter, 0xFF == SkGetPackedA32(storage[b])); |
| } |
| } |
| } |
| } |
| } |