Move src/gfx/ to src/ui/gfx...

gfx/skbitmap_operations_unittest.cc

-// Copyright (c) 2009 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 "gfx/skbitmap_operations.h"
-
-#include "testing/gtest/include/gtest/gtest.h"
-#include "third_party/skia/include/core/SkBitmap.h"
-#include "third_party/skia/include/core/SkColorPriv.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) {
-  SkAutoLockPixels a_lock(a);
-  SkAutoLockPixels b_lock(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->setConfig(SkBitmap::kARGB_8888_Config, w, h);
-  bmp->allocPixels();
-
-  unsigned char* src_data =
-      reinterpret_cast<unsigned char*>(bmp->getAddr32(0, 0));
-  for (int i = 0; i < w * h; i++) {
-    src_data[i * 4 + 0] = static_cast<unsigned char>(i % 255);
-    src_data[i * 4 + 1] = static_cast<unsigned char>(i % 255);
-    src_data[i * 4 + 2] = static_cast<unsigned char>(i % 255);
-    src_data[i * 4 + 3] = static_cast<unsigned char>(i % 255);
-  }
-}
-
-// The reference (i.e., old) implementation of |CreateHSLShiftedBitmap()|.
-SkBitmap ReferenceCreateHSLShiftedBitmap(
-    const SkBitmap& bitmap,
-    color_utils::HSL hsl_shift) {
-  SkBitmap shifted;
-  shifted.setConfig(SkBitmap::kARGB_8888_Config, bitmap.width(),
-                    bitmap.height(), 0);
-  shifted.allocPixels();
-  shifted.eraseARGB(0, 0, 0, 0);
-  shifted.setIsOpaque(false);
-
-  SkAutoLockPixels lock_bitmap(bitmap);
-  SkAutoLockPixels lock_shifted(shifted);
-
-  // 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.setConfig(SkBitmap::kARGB_8888_Config, src_w, src_h);
-  src.allocPixels();
-
-  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);
-  SkAutoLockPixels src_lock(src);
-  SkAutoLockPixels inverted_lock(inverted);
-
-  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.setConfig(SkBitmap::kARGB_8888_Config, src_w, src_h);
-  src_a.allocPixels();
-
-  SkBitmap src_b;
-  src_b.setConfig(SkBitmap::kARGB_8888_Config, src_w, src_h);
-  src_b.allocPixels();
-
-  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);
-  SkAutoLockPixels srca_lock(src_a);
-  SkAutoLockPixels srcb_lock(src_b);
-  SkAutoLockPixels blended_lock(blended);
-
-  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) {
-  int src_w = 16, src_h = 16;
-
-  SkBitmap src;
-  FillDataToBitmap(src_w, src_h, &src);
-
-  // Generate alpha mask
-  SkBitmap alpha;
-  alpha.setConfig(SkBitmap::kARGB_8888_Config, src_w, src_h);
-  alpha.allocPixels();
-  for (int y = 0, i = 0; y < src_h; y++) {
-    for (int x = 0; x < src_w; x++) {
-      *alpha.getAddr32(x, y) = SkColorSetARGB((i + 128) % 255,
-                                              (i + 128) % 255,
-                                              (i + 64) % 255,
-                                              (i + 0) % 255);
-      i++;
-    }
-  }
-
-  SkBitmap masked = SkBitmapOperations::CreateMaskedBitmap(src, alpha);
-
-  SkAutoLockPixels src_lock(src);
-  SkAutoLockPixels alpha_lock(alpha);
-  SkAutoLockPixels masked_lock(masked);
-  for (int y = 0; y < src_h; y++) {
-    for (int x = 0; x < src_w; x++) {
-      // Test that the alpha is equal.
-      SkColor src_pixel = SkUnPreMultiply::PMColorToColor(*src.getAddr32(x, y));
-      SkColor alpha_pixel =
-          SkUnPreMultiply::PMColorToColor(*alpha.getAddr32(x, y));
-      SkColor masked_pixel = *masked.getAddr32(x, y);
-
-      int alpha_value = SkAlphaMul(SkColorGetA(src_pixel),
-                                   SkColorGetA(alpha_pixel));
-      SkColor expected_pixel = SkColorSetARGB(
-          alpha_value,
-          SkAlphaMul(SkColorGetR(src_pixel), alpha_value),
-          SkAlphaMul(SkColorGetG(src_pixel), alpha_value),
-          SkAlphaMul(SkColorGetB(src_pixel), alpha_value));
-
-      EXPECT_TRUE(ColorsClose(expected_pixel, masked_pixel));
-    }
-  }
-}
-
-// 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.setConfig(SkBitmap::kARGB_8888_Config, src_w, src_h);
-  src.allocPixels();
-
-  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);
-
-  SkAutoLockPixels src_lock(src);
-  SkAutoLockPixels shifted_lock(shifted);
-
-  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.setConfig(SkBitmap::kARGB_8888_Config, src_w, src_h);
-  src.allocPixels();
-
-  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);
-
-  SkAutoLockPixels src_lock(src);
-  SkAutoLockPixels shifted_lock(shifted);
-
-  for (int y = 0, i = 0; y < src_h; y++) {
-    for (int x = 0; x < src_w; x++) {
-      EXPECT_TRUE(ColorsClose(*shifted.getAddr32(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.setConfig(SkBitmap::kARGB_8888_Config, dim*dim, dim*dim);
-  src.allocPixels();
-
-  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());
-
-  SkAutoLockPixels src_lock(src);
-  SkAutoLockPixels cropped_lock(cropped);
-  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());
-
-  SkAutoLockPixels src_lock(src);
-  SkAutoLockPixels cropped_lock(cropped);
-  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.setConfig(SkBitmap::kARGB_8888_Config, 3, 3);
-  input.allocPixels();
-
-  // 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.
-  SkAutoLockPixels lock(result);
-  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.setConfig(SkBitmap::kARGB_8888_Config, 1, 1);
-  one_by_one.allocPixels();
-  *one_by_one.getAddr32(0, 0) = reference;
-  SkBitmap result = SkBitmapOperations::DownsampleByTwo(one_by_one);
-  SkAutoLockPixels lock1(result);
-  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.setConfig(SkBitmap::kARGB_8888_Config, 300, 1);
-  one_by_n.allocPixels();
-  result = SkBitmapOperations::DownsampleByTwo(one_by_n);
-  SkAutoLockPixels lock2(result);
-  EXPECT_EQ(300, result.width());
-  EXPECT_EQ(1, result.height());
-
-  // Test a 1 by n bitmap.
-  SkBitmap n_by_one;
-  n_by_one.setConfig(SkBitmap::kARGB_8888_Config, 1, 300);
-  n_by_one.allocPixels();
-  result = SkBitmapOperations::DownsampleByTwo(n_by_one);
-  SkAutoLockPixels lock3(result);
-  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.setConfig(SkBitmap::kARGB_8888_Config, 10, 10);
-  too_small.allocPixels();
-  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.setConfig(SkBitmap::kARGB_8888_Config, 100, 43);
-  large.allocPixels();
-  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.setConfig(SkBitmap::kARGB_8888_Config, 2, 2);
-  input.allocPixels();
-
-  *input.getAddr32(0, 0) = 0x80000000;
-  *input.getAddr32(1, 0) = 0x80808080;
-  *input.getAddr32(0, 1) = 0xFF00CC88;
-  *input.getAddr32(1, 1) = 0x0000CC88;
-
-  SkBitmap result = SkBitmapOperations::UnPreMultiply(input);
-  EXPECT_EQ(2, result.width());
-  EXPECT_EQ(2, result.height());
-
-  SkAutoLockPixels lock(result);
-  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, CreateTransposedBtmap) {
-  SkBitmap input;
-  input.setConfig(SkBitmap::kARGB_8888_Config, 2, 3);
-  input.allocPixels();
-
-  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::CreateTransposedBtmap(input);
-  EXPECT_EQ(3, result.width());
-  EXPECT_EQ(2, result.height());
-
-  SkAutoLockPixels lock(result);
-  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));
-    }
-  }
-}