| // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include <algorithm> |
| #include <cmath> |
| #include <iomanip> |
| #include <vector> |
| |
| #include "base/compiler_specific.h" |
| #include "base/files/file_util.h" |
| #include "base/numerics/math_constants.h" |
| #include "base/stl_util.h" |
| #include "base/strings/string_util.h" |
| #include "skia/ext/image_operations.h" |
| #include "testing/gtest/include/gtest/gtest.h" |
| #include "third_party/skia/include/core/SkBitmap.h" |
| #include "third_party/skia/include/core/SkColorSpace.h" |
| #include "third_party/skia/include/core/SkImageInfo.h" |
| #include "third_party/skia/include/core/SkRect.h" |
| #include "ui/gfx/codec/png_codec.h" |
| #include "ui/gfx/geometry/size.h" |
| |
| namespace { |
| |
| // Computes the average pixel value for the given range, inclusive. |
| uint32_t AveragePixel(const SkBitmap& bmp, |
| int x_min, int x_max, |
| int y_min, int y_max) { |
| float accum[4] = {0, 0, 0, 0}; |
| int count = 0; |
| for (int y = y_min; y <= y_max; y++) { |
| for (int x = x_min; x <= x_max; x++) { |
| uint32_t cur = *bmp.getAddr32(x, y); |
| accum[0] += SkColorGetB(cur); |
| accum[1] += SkColorGetG(cur); |
| accum[2] += SkColorGetR(cur); |
| accum[3] += SkColorGetA(cur); |
| count++; |
| } |
| } |
| |
| return SkColorSetARGB(static_cast<unsigned char>(accum[3] / count), |
| static_cast<unsigned char>(accum[2] / count), |
| static_cast<unsigned char>(accum[1] / count), |
| static_cast<unsigned char>(accum[0] / count)); |
| } |
| |
| // Computes the average pixel (/color) value for the given colors. |
| SkColor AveragePixel(const SkColor colors[], size_t color_count) { |
| float accum[4] = { 0.0f, 0.0f, 0.0f, 0.0f }; |
| for (size_t i = 0; i < color_count; ++i) { |
| const SkColor cur = colors[i]; |
| accum[0] += static_cast<float>(SkColorGetA(cur)); |
| accum[1] += static_cast<float>(SkColorGetR(cur)); |
| accum[2] += static_cast<float>(SkColorGetG(cur)); |
| accum[3] += static_cast<float>(SkColorGetB(cur)); |
| } |
| const SkColor average_color = |
| SkColorSetARGB(static_cast<uint8_t>(accum[0] / color_count), |
| static_cast<uint8_t>(accum[1] / color_count), |
| static_cast<uint8_t>(accum[2] / color_count), |
| static_cast<uint8_t>(accum[3] / color_count)); |
| return average_color; |
| } |
| |
| void PrintPixel(const SkBitmap& bmp, |
| int x_min, int x_max, |
| int y_min, int y_max) { |
| char str[128]; |
| |
| for (int y = y_min; y <= y_max; ++y) { |
| for (int x = x_min; x <= x_max; ++x) { |
| const uint32_t cur = *bmp.getAddr32(x, y); |
| base::snprintf(str, sizeof(str), "bmp[%d,%d] = %08X", x, y, cur); |
| ADD_FAILURE() << str; |
| } |
| } |
| } |
| |
| // Returns the euclidian distance between two RGBA colors interpreted |
| // as 4-components vectors. |
| // |
| // Notes: |
| // - This is a really poor definition of color distance. Yet it |
| // is "good enough" for our uses here. |
| // - More realistic measures like the various Delta E formulas defined |
| // by CIE are way more complex and themselves require the RGBA to |
| // to transformed into CIELAB (typically via sRGB first). |
| // - The static_cast<int> below are needed to avoid interpreting "negative" |
| // differences as huge positive values. |
| float ColorsEuclidianDistance(const SkColor a, const SkColor b) { |
| int b_int_diff = static_cast<int>(SkColorGetB(a) - SkColorGetB(b)); |
| int g_int_diff = static_cast<int>(SkColorGetG(a) - SkColorGetG(b)); |
| int r_int_diff = static_cast<int>(SkColorGetR(a) - SkColorGetR(b)); |
| int a_int_diff = static_cast<int>(SkColorGetA(a) - SkColorGetA(b)); |
| |
| float b_float_diff = static_cast<float>(b_int_diff); |
| float g_float_diff = static_cast<float>(g_int_diff); |
| float r_float_diff = static_cast<float>(r_int_diff); |
| float a_float_diff = static_cast<float>(a_int_diff); |
| |
| return sqrtf((b_float_diff * b_float_diff) + (g_float_diff * g_float_diff) + |
| (r_float_diff * r_float_diff) + (a_float_diff * a_float_diff)); |
| } |
| |
| // Returns true if each channel of the given two colors are "close." This is |
| // used for comparing colors where rounding errors may cause off-by-one. |
| bool ColorsClose(uint32_t a, uint32_t b) { |
| return abs(static_cast<int>(SkColorGetB(a) - SkColorGetB(b))) < 2 && |
| abs(static_cast<int>(SkColorGetG(a) - SkColorGetG(b))) < 2 && |
| abs(static_cast<int>(SkColorGetR(a) - SkColorGetR(b))) < 2 && |
| abs(static_cast<int>(SkColorGetA(a) - SkColorGetA(b))) < 2; |
| } |
| |
| void FillDataToBitmap(int w, int h, SkBitmap* bmp) { |
| bmp->allocPixels(SkImageInfo::MakeN32Premul(w, h, SkColorSpace::MakeSRGB())); |
| |
| for (int y = 0; y < h; ++y) { |
| for (int x = 0; x < w; ++x) { |
| const uint8_t component = static_cast<uint8_t>(y * w + x); |
| const SkColor pixel = SkColorSetARGB(component, component, |
| component, component); |
| *bmp->getAddr32(x, y) = pixel; |
| } |
| } |
| } |
| |
| // Draws a checkerboard pattern into the w x h bitmap passed in. |
| // Each rectangle is rect_w in width, rect_h in height. |
| // The colors alternate between color1 and color2, color1 being used |
| // in the rectangle at the top left corner. |
| void DrawCheckerToBitmap(int w, int h, |
| SkColor color1, SkColor color2, |
| int rect_w, int rect_h, |
| SkBitmap* bmp) { |
| ASSERT_GT(rect_w, 0); |
| ASSERT_GT(rect_h, 0); |
| ASSERT_NE(color1, color2); |
| |
| bmp->allocPixels(SkImageInfo::MakeN32Premul(w, h, SkColorSpace::MakeSRGB())); |
| |
| for (int y = 0; y < h; ++y) { |
| bool y_bit = (((y / rect_h) & 0x1) == 0); |
| |
| for (int x = 0; x < w; ++x) { |
| bool x_bit = (((x / rect_w) & 0x1) == 0); |
| |
| bool use_color2 = (x_bit != y_bit); // xor |
| |
| *bmp->getAddr32(x, y) = (use_color2 ? color2 : color1); |
| } |
| } |
| } |
| |
| // DEBUG_BITMAP_GENERATION (0 or 1) controls whether the routines |
| // to save the test bitmaps are present. By default the test just fails |
| // without reading/writing files but it is then convenient to have |
| // a simple way to make the failing tests write out the input/output images |
| // to check them visually. |
| #define DEBUG_BITMAP_GENERATION (0) |
| |
| #if DEBUG_BITMAP_GENERATION |
| void SaveBitmapToPNG(const SkBitmap& bmp, const char* path) { |
| std::vector<unsigned char> png; |
| gfx::PNGCodec::ColorFormat color_format = gfx::PNGCodec::FORMAT_RGBA; |
| if (!gfx::PNGCodec::Encode( |
| reinterpret_cast<const unsigned char*>(bmp.getPixels()), |
| color_format, gfx::Size(bmp.width(), bmp.height()), |
| static_cast<int>(bmp.rowBytes()), |
| false, std::vector<gfx::PNGCodec::Comment>(), &png)) { |
| FAIL() << "Failed to encode image"; |
| } |
| |
| const base::FilePath fpath(path); |
| const int num_written = |
| base::WriteFile(fpath, reinterpret_cast<const char*>(&png[0]), |
| png.size()); |
| if (num_written != static_cast<int>(png.size())) { |
| FAIL() << "Failed to write dest \"" << path << '"'; |
| } |
| } |
| #endif // #if DEBUG_BITMAP_GENERATION |
| |
| void CheckResampleToSame(skia::ImageOperations::ResizeMethod method) { |
| // Make our source bitmap. |
| const int src_w = 16, src_h = 34; |
| SkBitmap src; |
| FillDataToBitmap(src_w, src_h, &src); |
| |
| // Do a resize of the full bitmap to the same size. The lanczos filter is good |
| // enough that we should get exactly the same image for output. |
| SkBitmap results = skia::ImageOperations::Resize(src, method, src_w, src_h); |
| ASSERT_EQ(src_w, results.width()); |
| ASSERT_EQ(src_h, results.height()); |
| EXPECT_TRUE(results.colorSpace() && results.colorSpace()->isSRGB()); |
| |
| for (int y = 0; y < src_h; y++) { |
| for (int x = 0; x < src_w; x++) { |
| EXPECT_EQ(*src.getAddr32(x, y), *results.getAddr32(x, y)); |
| } |
| } |
| } |
| |
| // Types defined outside of the ResizeShouldAverageColors test to allow |
| // use of the base::size() macro. |
| // |
| // 'max_color_distance_override' is used in a max() call together with |
| // the value of 'max_color_distance' defined in a TestedPixel instance. |
| // Hence a value of 0.0 in 'max_color_distance_override' means |
| // "use the pixel-specific value" and larger values can be used to allow |
| // worse computation errors than provided in a TestedPixel instance. |
| struct TestedResizeMethod { |
| skia::ImageOperations::ResizeMethod method; |
| const char* name; |
| float max_color_distance_override; |
| }; |
| |
| struct TestedPixel { |
| int x; |
| int y; |
| float max_color_distance; |
| const char* name; |
| }; |
| |
| // Helper function used by the test "ResizeShouldAverageColors" below. |
| // Note that ASSERT_EQ does a "return;" on failure, hence we can't have |
| // a "bool" return value to reflect success. Hence "all_pixels_pass" |
| void CheckResizeMethodShouldAverageGrid( |
| const SkBitmap& src, |
| const TestedResizeMethod& tested_method, |
| int dest_w, int dest_h, SkColor average_color, |
| bool* method_passed) { |
| *method_passed = false; |
| |
| const TestedPixel tested_pixels[] = { |
| // Corners |
| { 0, 0, 2.3f, "Top left corner" }, |
| { 0, dest_h - 1, 2.3f, "Bottom left corner" }, |
| { dest_w - 1, 0, 2.3f, "Top right corner" }, |
| { dest_w - 1, dest_h - 1, 2.3f, "Bottom right corner" }, |
| // Middle points of each side |
| { dest_w / 2, 0, 1.0f, "Top middle" }, |
| { dest_w / 2, dest_h - 1, 1.0f, "Bottom middle" }, |
| { 0, dest_h / 2, 1.0f, "Left middle" }, |
| { dest_w - 1, dest_h / 2, 1.0f, "Right middle" }, |
| // Center |
| { dest_w / 2, dest_h / 2, 1.0f, "Center" } |
| }; |
| |
| // Resize the src |
| const skia::ImageOperations::ResizeMethod method = tested_method.method; |
| |
| SkBitmap dest = skia::ImageOperations::Resize(src, method, dest_w, dest_h); |
| ASSERT_EQ(dest_w, dest.width()); |
| ASSERT_EQ(dest_h, dest.height()); |
| EXPECT_TRUE(dest.colorSpace() && dest.colorSpace()->isSRGB()); |
| |
| // Check that pixels match the expected average. |
| float max_observed_distance = 0.0f; |
| bool all_pixels_ok = true; |
| |
| for (size_t pixel_index = 0; pixel_index < base::size(tested_pixels); |
| ++pixel_index) { |
| const TestedPixel& tested_pixel = tested_pixels[pixel_index]; |
| |
| const int x = tested_pixel.x; |
| const int y = tested_pixel.y; |
| const float max_allowed_distance = |
| std::max(tested_pixel.max_color_distance, |
| tested_method.max_color_distance_override); |
| |
| const SkColor actual_color = *dest.getAddr32(x, y); |
| |
| // Check that the pixels away from the border region are very close |
| // to the expected average color |
| float distance = ColorsEuclidianDistance(average_color, actual_color); |
| |
| EXPECT_LE(distance, max_allowed_distance) |
| << "Resizing method: " << tested_method.name |
| << ", pixel tested: " << tested_pixel.name |
| << "(" << x << ", " << y << ")" |
| << std::hex << std::showbase |
| << ", expected (avg) hex: " << average_color |
| << ", actual hex: " << actual_color; |
| |
| if (distance > max_allowed_distance) { |
| all_pixels_ok = false; |
| } |
| if (distance > max_observed_distance) { |
| max_observed_distance = distance; |
| } |
| } |
| |
| if (!all_pixels_ok) { |
| ADD_FAILURE() << "Maximum observed color distance for method " |
| << tested_method.name << ": " << max_observed_distance; |
| |
| #if DEBUG_BITMAP_GENERATION |
| char path[128]; |
| base::snprintf(path, sizeof(path), |
| "/tmp/ResizeShouldAverageColors_%s_dest.png", |
| tested_method.name); |
| SaveBitmapToPNG(dest, path); |
| #endif // #if DEBUG_BITMAP_GENERATION |
| } |
| |
| *method_passed = all_pixels_ok; |
| } |
| |
| |
| } // namespace |
| |
| // Helper tests that saves bitmaps to PNGs in /tmp/ to visually check |
| // that the bitmap generation functions work as expected. |
| // Those tests are not enabled by default as verification is done |
| // manually/visually, however it is convenient to leave the functions |
| // in place. |
| #if 0 && DEBUG_BITMAP_GENERATION |
| TEST(ImageOperations, GenerateGradientBitmap) { |
| // Make our source bitmap. |
| const int src_w = 640, src_h = 480; |
| SkBitmap src; |
| FillDataToBitmap(src_w, src_h, &src); |
| |
| SaveBitmapToPNG(src, "/tmp/gradient_640x480.png"); |
| } |
| |
| TEST(ImageOperations, GenerateGridBitmap) { |
| const int src_w = 640, src_h = 480, src_grid_pitch = 10, src_grid_width = 4; |
| const SkColor grid_color = SK_ColorRED, background_color = SK_ColorBLUE; |
| SkBitmap src; |
| DrawGridToBitmap(src_w, src_h, |
| background_color, grid_color, |
| src_grid_pitch, src_grid_width, |
| &src); |
| |
| SaveBitmapToPNG(src, "/tmp/grid_640x408_10_4_red_blue.png"); |
| } |
| |
| TEST(ImageOperations, GenerateCheckerBitmap) { |
| const int src_w = 640, src_h = 480, rect_w = 10, rect_h = 4; |
| const SkColor color1 = SK_ColorRED, color2 = SK_ColorBLUE; |
| SkBitmap src; |
| DrawCheckerToBitmap(src_w, src_h, color1, color2, rect_w, rect_h, &src); |
| |
| SaveBitmapToPNG(src, "/tmp/checker_640x408_10_4_red_blue.png"); |
| } |
| #endif // #if ... && DEBUG_BITMAP_GENERATION |
| |
| // Makes the bitmap 50% the size as the original using a box filter. This is |
| // an easy operation that we can check the results for manually. |
| TEST(ImageOperations, Halve) { |
| // Make our source bitmap. |
| int src_w = 30, src_h = 38; |
| SkBitmap src; |
| FillDataToBitmap(src_w, src_h, &src); |
| |
| // Do a halving of the full bitmap. |
| SkBitmap actual_results = skia::ImageOperations::Resize( |
| src, skia::ImageOperations::RESIZE_BOX, src_w / 2, src_h / 2); |
| ASSERT_EQ(src_w / 2, actual_results.width()); |
| ASSERT_EQ(src_h / 2, actual_results.height()); |
| EXPECT_TRUE(actual_results.colorSpace() && |
| actual_results.colorSpace()->isSRGB()); |
| |
| // Compute the expected values & compare. |
| for (int y = 0; y < actual_results.height(); y++) { |
| for (int x = 0; x < actual_results.width(); x++) { |
| // Note that those expressions take into account the "half-pixel" |
| // offset that comes into play due to considering the coordinates |
| // of the center of the pixels. So x * 2 is a simplification |
| // of ((x+0.5) * 2 - 1) and (x * 2 + 1) is really (x + 0.5) * 2. |
| int first_x = x * 2; |
| int last_x = std::min(src_w - 1, x * 2 + 1); |
| |
| int first_y = y * 2; |
| int last_y = std::min(src_h - 1, y * 2 + 1); |
| |
| const uint32_t expected_color = AveragePixel(src, |
| first_x, last_x, |
| first_y, last_y); |
| const uint32_t actual_color = *actual_results.getAddr32(x, y); |
| const bool close = ColorsClose(expected_color, actual_color); |
| EXPECT_TRUE(close); |
| if (!close) { |
| char str[128]; |
| base::snprintf(str, sizeof(str), |
| "exp[%d,%d] = %08X, actual[%d,%d] = %08X", |
| x, y, expected_color, x, y, actual_color); |
| ADD_FAILURE() << str; |
| PrintPixel(src, first_x, last_x, first_y, last_y); |
| } |
| } |
| } |
| } |
| |
| TEST(ImageOperations, HalveSubset) { |
| // Make our source bitmap. |
| int src_w = 16, src_h = 34; |
| SkBitmap src; |
| FillDataToBitmap(src_w, src_h, &src); |
| |
| // Do a halving of the full bitmap. |
| SkBitmap full_results = skia::ImageOperations::Resize( |
| src, skia::ImageOperations::RESIZE_BOX, src_w / 2, src_h / 2); |
| ASSERT_EQ(src_w / 2, full_results.width()); |
| ASSERT_EQ(src_h / 2, full_results.height()); |
| EXPECT_TRUE(full_results.colorSpace() && full_results.colorSpace()->isSRGB()); |
| |
| // Now do a halving of a a subset, recall the destination subset is in the |
| // destination coordinate system (max = half of the original image size). |
| SkIRect subset_rect = { 2, 3, 3, 6 }; |
| SkBitmap subset_results = skia::ImageOperations::Resize( |
| src, skia::ImageOperations::RESIZE_BOX, |
| src_w / 2, src_h / 2, subset_rect); |
| ASSERT_EQ(subset_rect.width(), subset_results.width()); |
| ASSERT_EQ(subset_rect.height(), subset_results.height()); |
| EXPECT_TRUE(subset_results.colorSpace() && |
| subset_results.colorSpace()->isSRGB()); |
| |
| // The computed subset and the corresponding subset of the original image |
| // should be the same. |
| for (int y = 0; y < subset_rect.height(); y++) { |
| for (int x = 0; x < subset_rect.width(); x++) { |
| ASSERT_EQ( |
| *full_results.getAddr32(x + subset_rect.fLeft, y + subset_rect.fTop), |
| *subset_results.getAddr32(x, y)); |
| } |
| } |
| } |
| |
| TEST(ImageOperations, InvalidParams) { |
| // Make our source bitmap. |
| SkBitmap src; |
| src.allocPixels(SkImageInfo::MakeA8(16, 34)); |
| |
| // Scale it, don't die. |
| SkBitmap full_results = skia::ImageOperations::Resize( |
| src, skia::ImageOperations::RESIZE_BOX, 10, 20); |
| } |
| |
| // Resamples an image to the same image, it should give the same result. |
| TEST(ImageOperations, ResampleToSameHamming1) { |
| CheckResampleToSame(skia::ImageOperations::RESIZE_HAMMING1); |
| } |
| |
| TEST(ImageOperations, ResampleToSameLanczos3) { |
| CheckResampleToSame(skia::ImageOperations::RESIZE_LANCZOS3); |
| } |
| |
| // Check that all Good/Better/Best, Box, Lanczos2 and Lanczos3 generate purple |
| // when resizing a 4x8 red/blue checker pattern by 1/16x1/16. |
| TEST(ImageOperations, ResizeShouldAverageColors) { |
| // Make our source bitmap. |
| const int src_w = 640, src_h = 480, checker_rect_w = 4, checker_rect_h = 8; |
| const SkColor checker_color1 = SK_ColorRED, checker_color2 = SK_ColorBLUE; |
| |
| const int dest_w = src_w / (4 * checker_rect_w); |
| const int dest_h = src_h / (2 * checker_rect_h); |
| |
| // Compute the expected (average) color |
| const SkColor colors[] = { checker_color1, checker_color2 }; |
| const SkColor average_color = AveragePixel(colors, base::size(colors)); |
| |
| static const TestedResizeMethod tested_methods[] = { |
| { skia::ImageOperations::RESIZE_GOOD, "GOOD", 0.0f }, |
| { skia::ImageOperations::RESIZE_BETTER, "BETTER", 0.0f }, |
| { skia::ImageOperations::RESIZE_BEST, "BEST", 0.0f }, |
| { skia::ImageOperations::RESIZE_BOX, "BOX", 0.0f }, |
| { skia::ImageOperations::RESIZE_HAMMING1, "HAMMING1", 0.0f }, |
| { skia::ImageOperations::RESIZE_LANCZOS3, "LANCZOS3", 0.0f }, |
| }; |
| |
| // Create our source bitmap. |
| SkBitmap src; |
| DrawCheckerToBitmap(src_w, src_h, |
| checker_color1, checker_color2, |
| checker_rect_w, checker_rect_h, |
| &src); |
| |
| // For each method, downscale by 16 in each dimension, |
| // and check each tested pixel against the expected average color. |
| bool all_methods_ok = true; |
| |
| for (size_t method_index = 0; method_index < base::size(tested_methods); |
| ++method_index) { |
| bool pass = true; |
| CheckResizeMethodShouldAverageGrid(src, |
| tested_methods[method_index], |
| dest_w, dest_h, average_color, |
| &pass); |
| if (!pass) { |
| all_methods_ok = false; |
| } |
| } |
| |
| if (!all_methods_ok) { |
| #if DEBUG_BITMAP_GENERATION |
| SaveBitmapToPNG(src, "/tmp/ResizeShouldAverageColors_src.png"); |
| #endif // #if DEBUG_BITMAP_GENERATION |
| } |
| } |
| |
| static double sinc(double x) { |
| if (x == 0.0) return 1.0; |
| x *= base::kPiDouble; |
| return sin(x) / x; |
| } |
| |
| static double lanczos3(double offset) { |
| if (fabs(offset) >= 3) return 0.0; |
| return sinc(offset) * sinc(offset / 3.0); |
| } |
| |
| TEST(ImageOperations, ScaleUp) { |
| const int src_w = 3; |
| const int src_h = 3; |
| const int dst_w = 9; |
| const int dst_h = 9; |
| SkBitmap src; |
| src.allocPixels( |
| SkImageInfo::MakeN32Premul(src_w, src_h, SkColorSpace::MakeSRGB())); |
| |
| for (int src_y = 0; src_y < src_h; ++src_y) { |
| for (int src_x = 0; src_x < src_w; ++src_x) { |
| *src.getAddr32(src_x, src_y) = |
| SkColorSetARGB(255, 10 + src_x * 100, 10 + src_y * 100, 0); |
| } |
| } |
| |
| SkBitmap dst = skia::ImageOperations::Resize( |
| src, |
| skia::ImageOperations::RESIZE_LANCZOS3, |
| dst_w, dst_h); |
| EXPECT_TRUE(dst.colorSpace() && dst.colorSpace()->isSRGB()); |
| for (int dst_y = 0; dst_y < dst_h; ++dst_y) { |
| for (int dst_x = 0; dst_x < dst_w; ++dst_x) { |
| float dst_x_in_src = (dst_x + 0.5) * src_w / dst_w; |
| float dst_y_in_src = (dst_y + 0.5) * src_h / dst_h; |
| float a = 0.0f; |
| float r = 0.0f; |
| float g = 0.0f; |
| float b = 0.0f; |
| float sum = 0.0f; |
| for (int src_y = 0; src_y < src_h; ++src_y) { |
| for (int src_x = 0; src_x < src_w; ++src_x) { |
| double coeff = |
| lanczos3(src_x + 0.5 - dst_x_in_src) * |
| lanczos3(src_y + 0.5 - dst_y_in_src); |
| sum += coeff; |
| SkColor tmp = *src.getAddr32(src_x, src_y); |
| a += coeff * SkColorGetA(tmp); |
| r += coeff * SkColorGetR(tmp); |
| g += coeff * SkColorGetG(tmp); |
| b += coeff * SkColorGetB(tmp); |
| } |
| } |
| a /= sum; |
| r /= sum; |
| g /= sum; |
| b /= sum; |
| if (a < 0.0f) a = 0.0f; |
| if (r < 0.0f) r = 0.0f; |
| if (g < 0.0f) g = 0.0f; |
| if (b < 0.0f) b = 0.0f; |
| if (a > 255.0f) a = 255.0f; |
| if (r > 255.0f) r = 255.0f; |
| if (g > 255.0f) g = 255.0f; |
| if (b > 255.0f) b = 255.0f; |
| SkColor dst_color = *dst.getAddr32(dst_x, dst_y); |
| EXPECT_LE(fabs(SkColorGetA(dst_color) - a), 1.5f); |
| EXPECT_LE(fabs(SkColorGetR(dst_color) - r), 1.5f); |
| EXPECT_LE(fabs(SkColorGetG(dst_color) - g), 1.5f); |
| EXPECT_LE(fabs(SkColorGetB(dst_color) - b), 1.5f); |
| if (HasFailure()) { |
| return; |
| } |
| } |
| } |
| } |