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- // 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 "ui/gfx/skbitmap_operations.h"
- #include <stdint.h>
- #include "testing/gtest/include/gtest/gtest.h"
- #include "third_party/skia/include/core/SkBitmap.h"
- #include "third_party/skia/include/core/SkCanvas.h"
- #include "third_party/skia/include/core/SkColorPriv.h"
- #include "third_party/skia/include/core/SkRect.h"
- #include "third_party/skia/include/core/SkRegion.h"
- #include "third_party/skia/include/core/SkUnPreMultiply.h"
- namespace {
- // 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.
- inline 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;
- }
- inline bool MultipliedColorsClose(uint32_t a, uint32_t b) {
- return ColorsClose(SkUnPreMultiply::PMColorToColor(a),
- SkUnPreMultiply::PMColorToColor(b));
- }
- bool BitmapsClose(const SkBitmap& a, const SkBitmap& b) {
- for (int y = 0; y < a.height(); y++) {
- for (int x = 0; x < a.width(); x++) {
- SkColor a_pixel = *a.getAddr32(x, y);
- SkColor b_pixel = *b.getAddr32(x, y);
- if (!ColorsClose(a_pixel, b_pixel))
- return false;
- }
- }
- return true;
- }
- void FillDataToBitmap(int w, int h, SkBitmap* bmp) {
- bmp->allocN32Pixels(w, h);
- unsigned char* src_data =
- reinterpret_cast<unsigned char*>(bmp->getAddr32(0, 0));
- for (int i = 0; i < w * h; i++) {
- const int alpha = i % 256;
- src_data[i * 4 + 0] = static_cast<unsigned char>(alpha);
- src_data[i * 4 + 1] = static_cast<unsigned char>((i + 16) % (alpha + 1));
- src_data[i * 4 + 2] = static_cast<unsigned char>((i + 32) % (alpha + 1));
- src_data[i * 4 + 3] = static_cast<unsigned char>((i + 64) % (alpha + 1));
- }
- }
- // The reference (i.e., old) implementation of |CreateHSLShiftedBitmap()|.
- SkBitmap ReferenceCreateHSLShiftedBitmap(
- const SkBitmap& bitmap,
- color_utils::HSL hsl_shift) {
- SkBitmap shifted;
- shifted.allocN32Pixels(bitmap.width(), bitmap.height());
- shifted.eraseARGB(0, 0, 0, 0);
- // Loop through the pixels of the original bitmap.
- for (int y = 0; y < bitmap.height(); ++y) {
- SkPMColor* pixels = bitmap.getAddr32(0, y);
- SkPMColor* tinted_pixels = shifted.getAddr32(0, y);
- for (int x = 0; x < bitmap.width(); ++x) {
- tinted_pixels[x] = SkPreMultiplyColor(color_utils::HSLShift(
- SkUnPreMultiply::PMColorToColor(pixels[x]), hsl_shift));
- }
- }
- return shifted;
- }
- } // namespace
- // Invert bitmap and verify the each pixel is inverted and the alpha value is
- // not changed.
- TEST(SkBitmapOperationsTest, CreateInvertedBitmap) {
- int src_w = 16, src_h = 16;
- SkBitmap src;
- src.allocN32Pixels(src_w, src_h);
- for (int y = 0; y < src_h; y++) {
- for (int x = 0; x < src_w; x++) {
- int i = y * src_w + x;
- *src.getAddr32(x, y) =
- SkColorSetARGB((255 - i) % 255, i % 255, i * 4 % 255, 0);
- }
- }
- SkBitmap inverted = SkBitmapOperations::CreateInvertedBitmap(src);
- for (int y = 0; y < src_h; y++) {
- for (int x = 0; x < src_w; x++) {
- int i = y * src_w + x;
- EXPECT_EQ(static_cast<unsigned int>((255 - i) % 255),
- SkColorGetA(*inverted.getAddr32(x, y)));
- EXPECT_EQ(static_cast<unsigned int>(255 - (i % 255)),
- SkColorGetR(*inverted.getAddr32(x, y)));
- EXPECT_EQ(static_cast<unsigned int>(255 - (i * 4 % 255)),
- SkColorGetG(*inverted.getAddr32(x, y)));
- EXPECT_EQ(static_cast<unsigned int>(255),
- SkColorGetB(*inverted.getAddr32(x, y)));
- }
- }
- }
- // Blend two bitmaps together at 50% alpha and verify that the result
- // is the middle-blend of the two.
- TEST(SkBitmapOperationsTest, CreateBlendedBitmap) {
- int src_w = 16, src_h = 16;
- SkBitmap src_a;
- src_a.allocN32Pixels(src_w, src_h);
- SkBitmap src_b;
- src_b.allocN32Pixels(src_w, src_h);
- for (int y = 0, i = 0; y < src_h; y++) {
- for (int x = 0; x < src_w; x++) {
- *src_a.getAddr32(x, y) = SkColorSetARGB(255, 0, i * 2 % 255, i % 255);
- *src_b.getAddr32(x, y) =
- SkColorSetARGB((255 - i) % 255, i % 255, i * 4 % 255, 0);
- i++;
- }
- }
- // Shift to red.
- SkBitmap blended = SkBitmapOperations::CreateBlendedBitmap(
- src_a, src_b, 0.5);
- for (int y = 0; y < src_h; y++) {
- for (int x = 0; x < src_w; x++) {
- int i = y * src_w + x;
- EXPECT_EQ(static_cast<unsigned int>((255 + ((255 - i) % 255)) / 2),
- SkColorGetA(*blended.getAddr32(x, y)));
- EXPECT_EQ(static_cast<unsigned int>(i % 255 / 2),
- SkColorGetR(*blended.getAddr32(x, y)));
- EXPECT_EQ((static_cast<unsigned int>((i * 2) % 255 + (i * 4) % 255) / 2),
- SkColorGetG(*blended.getAddr32(x, y)));
- EXPECT_EQ(static_cast<unsigned int>(i % 255 / 2),
- SkColorGetB(*blended.getAddr32(x, y)));
- }
- }
- }
- // Test our masking functions.
- TEST(SkBitmapOperationsTest, CreateMaskedBitmap) {
- const int src_w = 16, src_h = 16;
- SkBitmap src;
- FillDataToBitmap(src_w, src_h, &src);
- SkBitmap alpha;
- alpha.allocN32Pixels(src_w, src_h);
- for (int y = 0, i = 0; y < src_h; y++) {
- for (int x = 0; x < src_w; x++) {
- *alpha.getAddr32(x, y) = SkPackARGB32(i % 256, 0, 0, 0);
- i++;
- }
- }
- SkBitmap masked = SkBitmapOperations::CreateMaskedBitmap(src, alpha);
- for (int y = 0; y < src_h; y++) {
- for (int x = 0; x < src_w; x++) {
- int alpha_pixel = *alpha.getAddr32(x, y);
- int src_pixel = *src.getAddr32(x, y);
- int masked_pixel = *masked.getAddr32(x, y);
- int scale = SkAlpha255To256(SkGetPackedA32(alpha_pixel));
- int src_a = (src_pixel >> SK_A32_SHIFT) & 0xFF;
- int src_r = (src_pixel >> SK_R32_SHIFT) & 0xFF;
- int src_g = (src_pixel >> SK_G32_SHIFT) & 0xFF;
- int src_b = (src_pixel >> SK_B32_SHIFT) & 0xFF;
- int masked_a = (masked_pixel >> SK_A32_SHIFT) & 0xFF;
- int masked_r = (masked_pixel >> SK_R32_SHIFT) & 0xFF;
- int masked_g = (masked_pixel >> SK_G32_SHIFT) & 0xFF;
- int masked_b = (masked_pixel >> SK_B32_SHIFT) & 0xFF;
- EXPECT_EQ((src_a * scale) >> 8, masked_a);
- EXPECT_EQ((src_r * scale) >> 8, masked_r);
- EXPECT_EQ((src_g * scale) >> 8, masked_g);
- EXPECT_EQ((src_b * scale) >> 8, masked_b);
- }
- }
- }
- // Make sure that when shifting a bitmap without any shift parameters,
- // the end result is close enough to the original (rounding errors
- // notwithstanding).
- TEST(SkBitmapOperationsTest, CreateHSLShiftedBitmapToSame) {
- int src_w = 16, src_h = 16;
- SkBitmap src;
- src.allocN32Pixels(src_w, src_h);
- for (int y = 0, i = 0; y < src_h; y++) {
- for (int x = 0; x < src_w; x++) {
- *src.getAddr32(x, y) = SkPreMultiplyColor(SkColorSetARGB((i + 128) % 255,
- (i + 128) % 255, (i + 64) % 255, (i + 0) % 255));
- i++;
- }
- }
- color_utils::HSL hsl = { -1, -1, -1 };
- SkBitmap shifted = ReferenceCreateHSLShiftedBitmap(src, hsl);
- for (int y = 0; y < src_h; y++) {
- for (int x = 0; x < src_w; x++) {
- SkColor src_pixel = *src.getAddr32(x, y);
- SkColor shifted_pixel = *shifted.getAddr32(x, y);
- EXPECT_TRUE(MultipliedColorsClose(src_pixel, shifted_pixel)) <<
- "source: (a,r,g,b) = (" << SkColorGetA(src_pixel) << "," <<
- SkColorGetR(src_pixel) << "," <<
- SkColorGetG(src_pixel) << "," <<
- SkColorGetB(src_pixel) << "); " <<
- "shifted: (a,r,g,b) = (" << SkColorGetA(shifted_pixel) << "," <<
- SkColorGetR(shifted_pixel) << "," <<
- SkColorGetG(shifted_pixel) << "," <<
- SkColorGetB(shifted_pixel) << ")";
- }
- }
- }
- // Shift a blue bitmap to red.
- TEST(SkBitmapOperationsTest, CreateHSLShiftedBitmapHueOnly) {
- int src_w = 16, src_h = 16;
- SkBitmap src;
- src.allocN32Pixels(src_w, src_h);
- for (int y = 0, i = 0; y < src_h; y++) {
- for (int x = 0; x < src_w; x++) {
- *src.getAddr32(x, y) = SkColorSetARGB(255, 0, 0, i % 255);
- i++;
- }
- }
- // Shift to red.
- color_utils::HSL hsl = { 0, -1, -1 };
- SkBitmap shifted = SkBitmapOperations::CreateHSLShiftedBitmap(src, hsl);
- for (int y = 0, i = 0; y < src_h; y++) {
- for (int x = 0; x < src_w; x++) {
- EXPECT_TRUE(ColorsClose(shifted.getColor(x, y),
- SkColorSetARGB(255, i % 255, 0, 0)));
- i++;
- }
- }
- }
- // Validate HSL shift.
- TEST(SkBitmapOperationsTest, ValidateHSLShift) {
- // Note: 255/51 = 5 (exactly) => 6 including 0!
- const int inc = 51;
- const int dim = 255 / inc + 1;
- SkBitmap src;
- src.allocN32Pixels(dim*dim, dim*dim);
- for (int a = 0, y = 0; a <= 255; a += inc) {
- for (int r = 0; r <= 255; r += inc, y++) {
- for (int g = 0, x = 0; g <= 255; g += inc) {
- for (int b = 0; b <= 255; b+= inc, x++) {
- *src.getAddr32(x, y) =
- SkPreMultiplyColor(SkColorSetARGB(a, r, g, b));
- }
- }
- }
- }
- // Shhhh. The spec says I should set things to -1 for "no change", but
- // actually -0.1 will do. Don't tell anyone I did this.
- for (double h = -0.1; h <= 1.0001; h += 0.1) {
- for (double s = -0.1; s <= 1.0001; s += 0.1) {
- for (double l = -0.1; l <= 1.0001; l += 0.1) {
- color_utils::HSL hsl = { h, s, l };
- SkBitmap ref_shifted = ReferenceCreateHSLShiftedBitmap(src, hsl);
- SkBitmap shifted = SkBitmapOperations::CreateHSLShiftedBitmap(src, hsl);
- EXPECT_TRUE(BitmapsClose(ref_shifted, shifted))
- << "h = " << h << ", s = " << s << ", l = " << l;
- }
- }
- }
- }
- // Test our cropping.
- TEST(SkBitmapOperationsTest, CreateCroppedBitmap) {
- int src_w = 16, src_h = 16;
- SkBitmap src;
- FillDataToBitmap(src_w, src_h, &src);
- SkBitmap cropped = SkBitmapOperations::CreateTiledBitmap(src, 4, 4,
- 8, 8);
- ASSERT_EQ(8, cropped.width());
- ASSERT_EQ(8, cropped.height());
- for (int y = 4; y < 12; y++) {
- for (int x = 4; x < 12; x++) {
- EXPECT_EQ(*src.getAddr32(x, y),
- *cropped.getAddr32(x - 4, y - 4));
- }
- }
- }
- // Test whether our cropping correctly wraps across image boundaries.
- TEST(SkBitmapOperationsTest, CreateCroppedBitmapWrapping) {
- int src_w = 16, src_h = 16;
- SkBitmap src;
- FillDataToBitmap(src_w, src_h, &src);
- SkBitmap cropped = SkBitmapOperations::CreateTiledBitmap(
- src, src_w / 2, src_h / 2, src_w, src_h);
- ASSERT_EQ(src_w, cropped.width());
- ASSERT_EQ(src_h, cropped.height());
- for (int y = 0; y < src_h; y++) {
- for (int x = 0; x < src_w; x++) {
- EXPECT_EQ(*src.getAddr32(x, y),
- *cropped.getAddr32((x + src_w / 2) % src_w,
- (y + src_h / 2) % src_h));
- }
- }
- }
- TEST(SkBitmapOperationsTest, DownsampleByTwo) {
- // Use an odd-sized bitmap to make sure the edge cases where there isn't a
- // 2x2 block of pixels is handled correctly.
- // Here's the ARGB example
- //
- // 50% transparent green opaque 50% blue white
- // 80008000 FF000080 FFFFFFFF
- //
- // 50% transparent red opaque 50% gray black
- // 80800000 80808080 FF000000
- //
- // black white 50% gray
- // FF000000 FFFFFFFF FF808080
- //
- // The result of this computation should be:
- // A0404040 FF808080
- // FF808080 FF808080
- SkBitmap input;
- input.allocN32Pixels(3, 3);
- // The color order may be different, but we don't care (the channels are
- // trated the same).
- *input.getAddr32(0, 0) = 0x80008000;
- *input.getAddr32(1, 0) = 0xFF000080;
- *input.getAddr32(2, 0) = 0xFFFFFFFF;
- *input.getAddr32(0, 1) = 0x80800000;
- *input.getAddr32(1, 1) = 0x80808080;
- *input.getAddr32(2, 1) = 0xFF000000;
- *input.getAddr32(0, 2) = 0xFF000000;
- *input.getAddr32(1, 2) = 0xFFFFFFFF;
- *input.getAddr32(2, 2) = 0xFF808080;
- SkBitmap result = SkBitmapOperations::DownsampleByTwo(input);
- EXPECT_EQ(2, result.width());
- EXPECT_EQ(2, result.height());
- // Some of the values are off-by-one due to rounding.
- EXPECT_EQ(0x9f404040, *result.getAddr32(0, 0));
- EXPECT_EQ(0xFF7f7f7f, *result.getAddr32(1, 0));
- EXPECT_EQ(0xFF7f7f7f, *result.getAddr32(0, 1));
- EXPECT_EQ(0xFF808080, *result.getAddr32(1, 1));
- }
- // Test edge cases for DownsampleByTwo.
- TEST(SkBitmapOperationsTest, DownsampleByTwoSmall) {
- SkPMColor reference = 0xFF4080FF;
- // Test a 1x1 bitmap.
- SkBitmap one_by_one;
- one_by_one.allocN32Pixels(1, 1);
- *one_by_one.getAddr32(0, 0) = reference;
- SkBitmap result = SkBitmapOperations::DownsampleByTwo(one_by_one);
- EXPECT_EQ(1, result.width());
- EXPECT_EQ(1, result.height());
- EXPECT_EQ(reference, *result.getAddr32(0, 0));
- // Test an n by 1 bitmap.
- SkBitmap one_by_n;
- one_by_n.allocN32Pixels(300, 1);
- result = SkBitmapOperations::DownsampleByTwo(one_by_n);
- EXPECT_EQ(300, result.width());
- EXPECT_EQ(1, result.height());
- // Test a 1 by n bitmap.
- SkBitmap n_by_one;
- n_by_one.allocN32Pixels(1, 300);
- result = SkBitmapOperations::DownsampleByTwo(n_by_one);
- EXPECT_EQ(1, result.width());
- EXPECT_EQ(300, result.height());
- // Test an empty bitmap
- SkBitmap empty;
- result = SkBitmapOperations::DownsampleByTwo(empty);
- EXPECT_TRUE(result.isNull());
- EXPECT_EQ(0, result.width());
- EXPECT_EQ(0, result.height());
- }
- // Here we assume DownsampleByTwo works correctly (it's tested above) and
- // just make sure that the wrapper function does the right thing.
- TEST(SkBitmapOperationsTest, DownsampleByTwoUntilSize) {
- // First make sure a "too small" bitmap doesn't get modified at all.
- SkBitmap too_small;
- too_small.allocN32Pixels(10, 10);
- SkBitmap result = SkBitmapOperations::DownsampleByTwoUntilSize(
- too_small, 16, 16);
- EXPECT_EQ(10, result.width());
- EXPECT_EQ(10, result.height());
- // Now make sure giving it a 0x0 target returns something reasonable.
- result = SkBitmapOperations::DownsampleByTwoUntilSize(too_small, 0, 0);
- EXPECT_EQ(1, result.width());
- EXPECT_EQ(1, result.height());
- // Test multiple steps of downsampling.
- SkBitmap large;
- large.allocN32Pixels(100, 43);
- result = SkBitmapOperations::DownsampleByTwoUntilSize(large, 6, 6);
- // The result should be divided in half 100x43 -> 50x22 -> 25x11
- EXPECT_EQ(25, result.width());
- EXPECT_EQ(11, result.height());
- }
- TEST(SkBitmapOperationsTest, UnPreMultiply) {
- SkBitmap input;
- input.allocN32Pixels(2, 2);
- EXPECT_EQ(input.alphaType(), kPremul_SkAlphaType);
- // Set PMColors into the bitmap
- *input.getAddr32(0, 0) = SkPackARGB32NoCheck(0x80, 0x00, 0x00, 0x00);
- *input.getAddr32(1, 0) = SkPackARGB32NoCheck(0x80, 0x80, 0x80, 0x80);
- *input.getAddr32(0, 1) = SkPackARGB32NoCheck(0xFF, 0x00, 0xCC, 0x88);
- *input.getAddr32(1, 1) = SkPackARGB32NoCheck(0x00, 0x00, 0xCC, 0x88);
- SkBitmap result = SkBitmapOperations::UnPreMultiply(input);
- EXPECT_EQ(result.alphaType(), kUnpremul_SkAlphaType);
- EXPECT_EQ(2, result.width());
- EXPECT_EQ(2, result.height());
- EXPECT_NE(result.getPixels(), input.getPixels());
- EXPECT_EQ(0x80000000, *result.getAddr32(0, 0));
- EXPECT_EQ(0x80FFFFFF, *result.getAddr32(1, 0));
- EXPECT_EQ(0xFF00CC88, *result.getAddr32(0, 1));
- EXPECT_EQ(0x00000000u, *result.getAddr32(1, 1)); // "Division by zero".
- }
- TEST(SkBitmapOperationsTest, UnPreMultiplyOpaque) {
- SkBitmap input;
- input.allocN32Pixels(2, 2, true);
- EXPECT_EQ(input.alphaType(), kOpaque_SkAlphaType);
- SkBitmap result = SkBitmapOperations::UnPreMultiply(input);
- EXPECT_EQ(result.alphaType(), kOpaque_SkAlphaType);
- EXPECT_EQ(result.getPixels(), input.getPixels());
- }
- TEST(SkBitmapOperationsTest, UnPreMultiplyAlreadyUnPreMultiplied) {
- SkBitmap input;
- input.allocN32Pixels(2, 2);
- input.setAlphaType(kUnpremul_SkAlphaType);
- EXPECT_EQ(input.alphaType(), kUnpremul_SkAlphaType);
- SkBitmap result = SkBitmapOperations::UnPreMultiply(input);
- EXPECT_EQ(result.alphaType(), kUnpremul_SkAlphaType);
- EXPECT_EQ(result.getPixels(), input.getPixels());
- }
- TEST(SkBitmapOperationsTest, CreateTransposedBitmap) {
- SkBitmap input;
- input.allocN32Pixels(2, 3);
- for (int x = 0; x < input.width(); ++x) {
- for (int y = 0; y < input.height(); ++y) {
- *input.getAddr32(x, y) = x * input.width() + y;
- }
- }
- SkBitmap result = SkBitmapOperations::CreateTransposedBitmap(input);
- EXPECT_EQ(3, result.width());
- EXPECT_EQ(2, result.height());
- for (int x = 0; x < input.width(); ++x) {
- for (int y = 0; y < input.height(); ++y) {
- EXPECT_EQ(*input.getAddr32(x, y), *result.getAddr32(y, x));
- }
- }
- }
- void DrawRectWithColor(SkCanvas* canvas,
- int left,
- int top,
- int right,
- int bottom,
- SkColor color) {
- SkPaint paint;
- paint.setColor(color);
- paint.setBlendMode(SkBlendMode::kSrc);
- canvas->drawRect(
- SkRect::MakeLTRB(SkIntToScalar(left), SkIntToScalar(top),
- SkIntToScalar(right), SkIntToScalar(bottom)),
- paint);
- }
- // Check that Rotate provides the desired results
- TEST(SkBitmapOperationsTest, RotateImage) {
- const int src_w = 6, src_h = 4;
- SkBitmap src;
- // Create a simple 4 color bitmap:
- // RRRBBB
- // RRRBBB
- // GGGYYY
- // GGGYYY
- src.allocN32Pixels(src_w, src_h);
- SkCanvas canvas(src, SkSurfaceProps{});
- src.eraseARGB(0, 0, 0, 0);
- // This region is a semi-transparent red to test non-opaque pixels.
- DrawRectWithColor(&canvas, 0, 0, src_w / 2, src_h / 2, 0x1FFF0000);
- DrawRectWithColor(&canvas, src_w / 2, 0, src_w, src_h / 2, SK_ColorBLUE);
- DrawRectWithColor(&canvas, 0, src_h / 2, src_w / 2, src_h, SK_ColorGREEN);
- DrawRectWithColor(&canvas, src_w / 2, src_h / 2, src_w, src_h,
- SK_ColorYELLOW);
- SkBitmap rotate90, rotate180, rotate270;
- rotate90 = SkBitmapOperations::Rotate(src,
- SkBitmapOperations::ROTATION_90_CW);
- rotate180 = SkBitmapOperations::Rotate(src,
- SkBitmapOperations::ROTATION_180_CW);
- rotate270 = SkBitmapOperations::Rotate(src,
- SkBitmapOperations::ROTATION_270_CW);
- ASSERT_EQ(rotate90.width(), src.height());
- ASSERT_EQ(rotate90.height(), src.width());
- ASSERT_EQ(rotate180.width(), src.width());
- ASSERT_EQ(rotate180.height(), src.height());
- ASSERT_EQ(rotate270.width(), src.height());
- ASSERT_EQ(rotate270.height(), src.width());
- for (int x=0; x < src_w; ++x) {
- for (int y=0; y < src_h; ++y) {
- ASSERT_EQ(*src.getAddr32(x,y), *rotate90.getAddr32(src_h - (y+1),x));
- ASSERT_EQ(*src.getAddr32(x,y), *rotate270.getAddr32(y, src_w - (x+1)));
- ASSERT_EQ(*src.getAddr32(x,y),
- *rotate180.getAddr32(src_w - (x+1), src_h - (y+1)));
- }
- }
- }
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