Move more files to toplevel gfx.
TBR=darin
BUG=none
TEST=none
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@42071 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/gfx/skbitmap_operations.cc b/gfx/skbitmap_operations.cc
new file mode 100644
index 0000000..5ce8ebd
--- /dev/null
+++ b/gfx/skbitmap_operations.cc
@@ -0,0 +1,356 @@
+// 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 <algorithm>
+
+#include "base/logging.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/SkUnPreMultiply.h"
+
+// static
+SkBitmap SkBitmapOperations::CreateInvertedBitmap(const SkBitmap& image) {
+ DCHECK(image.config() == SkBitmap::kARGB_8888_Config);
+
+ SkAutoLockPixels lock_image(image);
+
+ SkBitmap inverted;
+ inverted.setConfig(SkBitmap::kARGB_8888_Config, image.width(), image.height(),
+ 0);
+ inverted.allocPixels();
+ inverted.eraseARGB(0, 0, 0, 0);
+
+ for (int y = 0; y < image.height(); ++y) {
+ uint32* image_row = image.getAddr32(0, y);
+ uint32* dst_row = inverted.getAddr32(0, y);
+
+ for (int x = 0; x < image.width(); ++x) {
+ uint32 image_pixel = image_row[x];
+ dst_row[x] = (image_pixel & 0xFF000000) |
+ (0x00FFFFFF - (image_pixel & 0x00FFFFFF));
+ }
+ }
+
+ return inverted;
+}
+
+// static
+SkBitmap SkBitmapOperations::CreateSuperimposedBitmap(const SkBitmap& first,
+ const SkBitmap& second) {
+ DCHECK(first.width() == second.width());
+ DCHECK(first.height() == second.height());
+ DCHECK(first.bytesPerPixel() == second.bytesPerPixel());
+ DCHECK(first.config() == SkBitmap::kARGB_8888_Config);
+
+ SkAutoLockPixels lock_first(first);
+ SkAutoLockPixels lock_second(second);
+
+ SkBitmap superimposed;
+ superimposed.setConfig(SkBitmap::kARGB_8888_Config,
+ first.width(), first.height());
+ superimposed.allocPixels();
+ superimposed.eraseARGB(0, 0, 0, 0);
+
+ SkCanvas canvas(superimposed);
+
+ SkRect rect;
+ rect.fLeft = 0;
+ rect.fTop = 0;
+ rect.fRight = SkIntToScalar(first.width());
+ rect.fBottom = SkIntToScalar(first.height());
+
+ canvas.drawBitmapRect(first, NULL, rect);
+ canvas.drawBitmapRect(second, NULL, rect);
+
+ return superimposed;
+}
+
+// static
+SkBitmap SkBitmapOperations::CreateBlendedBitmap(const SkBitmap& first,
+ const SkBitmap& second,
+ double alpha) {
+ DCHECK((alpha >= 0) && (alpha <= 1));
+ DCHECK(first.width() == second.width());
+ DCHECK(first.height() == second.height());
+ DCHECK(first.bytesPerPixel() == second.bytesPerPixel());
+ DCHECK(first.config() == SkBitmap::kARGB_8888_Config);
+
+ // Optimize for case where we won't need to blend anything.
+ static const double alpha_min = 1.0 / 255;
+ static const double alpha_max = 254.0 / 255;
+ if (alpha < alpha_min)
+ return first;
+ else if (alpha > alpha_max)
+ return second;
+
+ SkAutoLockPixels lock_first(first);
+ SkAutoLockPixels lock_second(second);
+
+ SkBitmap blended;
+ blended.setConfig(SkBitmap::kARGB_8888_Config, first.width(), first.height(),
+ 0);
+ blended.allocPixels();
+ blended.eraseARGB(0, 0, 0, 0);
+
+ double first_alpha = 1 - alpha;
+
+ for (int y = 0; y < first.height(); ++y) {
+ uint32* first_row = first.getAddr32(0, y);
+ uint32* second_row = second.getAddr32(0, y);
+ uint32* dst_row = blended.getAddr32(0, y);
+
+ for (int x = 0; x < first.width(); ++x) {
+ uint32 first_pixel = first_row[x];
+ uint32 second_pixel = second_row[x];
+
+ int a = static_cast<int>((SkColorGetA(first_pixel) * first_alpha) +
+ (SkColorGetA(second_pixel) * alpha));
+ int r = static_cast<int>((SkColorGetR(first_pixel) * first_alpha) +
+ (SkColorGetR(second_pixel) * alpha));
+ int g = static_cast<int>((SkColorGetG(first_pixel) * first_alpha) +
+ (SkColorGetG(second_pixel) * alpha));
+ int b = static_cast<int>((SkColorGetB(first_pixel) * first_alpha) +
+ (SkColorGetB(second_pixel) * alpha));
+
+ dst_row[x] = SkColorSetARGB(a, r, g, b);
+ }
+ }
+
+ return blended;
+}
+
+// static
+SkBitmap SkBitmapOperations::CreateMaskedBitmap(const SkBitmap& rgb,
+ const SkBitmap& alpha) {
+ DCHECK(rgb.width() == alpha.width());
+ DCHECK(rgb.height() == alpha.height());
+ DCHECK(rgb.bytesPerPixel() == alpha.bytesPerPixel());
+ DCHECK(rgb.config() == SkBitmap::kARGB_8888_Config);
+ DCHECK(alpha.config() == SkBitmap::kARGB_8888_Config);
+
+ SkBitmap masked;
+ masked.setConfig(SkBitmap::kARGB_8888_Config, rgb.width(), rgb.height(), 0);
+ masked.allocPixels();
+ masked.eraseARGB(0, 0, 0, 0);
+
+ SkAutoLockPixels lock_rgb(rgb);
+ SkAutoLockPixels lock_alpha(alpha);
+ SkAutoLockPixels lock_masked(masked);
+
+ for (int y = 0; y < masked.height(); ++y) {
+ uint32* rgb_row = rgb.getAddr32(0, y);
+ uint32* alpha_row = alpha.getAddr32(0, y);
+ uint32* dst_row = masked.getAddr32(0, y);
+
+ for (int x = 0; x < masked.width(); ++x) {
+ SkColor rgb_pixel = SkUnPreMultiply::PMColorToColor(rgb_row[x]);
+ int alpha = SkAlphaMul(SkColorGetA(rgb_pixel), SkColorGetA(alpha_row[x]));
+ dst_row[x] = SkColorSetARGB(alpha,
+ SkAlphaMul(SkColorGetR(rgb_pixel), alpha),
+ SkAlphaMul(SkColorGetG(rgb_pixel), alpha),
+ SkAlphaMul(SkColorGetB(rgb_pixel), alpha));
+ }
+ }
+
+ return masked;
+}
+
+// static
+SkBitmap SkBitmapOperations::CreateButtonBackground(SkColor color,
+ const SkBitmap& image,
+ const SkBitmap& mask) {
+ DCHECK(image.config() == SkBitmap::kARGB_8888_Config);
+ DCHECK(mask.config() == SkBitmap::kARGB_8888_Config);
+
+ SkBitmap background;
+ background.setConfig(
+ SkBitmap::kARGB_8888_Config, mask.width(), mask.height(), 0);
+ background.allocPixels();
+
+ double bg_a = SkColorGetA(color);
+ double bg_r = SkColorGetR(color);
+ double bg_g = SkColorGetG(color);
+ double bg_b = SkColorGetB(color);
+
+ SkAutoLockPixels lock_mask(mask);
+ SkAutoLockPixels lock_image(image);
+ SkAutoLockPixels lock_background(background);
+
+ for (int y = 0; y < mask.height(); ++y) {
+ uint32* dst_row = background.getAddr32(0, y);
+ uint32* image_row = image.getAddr32(0, y % image.height());
+ uint32* mask_row = mask.getAddr32(0, y);
+
+ for (int x = 0; x < mask.width(); ++x) {
+ uint32 image_pixel = image_row[x % image.width()];
+
+ double img_a = SkColorGetA(image_pixel);
+ double img_r = SkColorGetR(image_pixel);
+ double img_g = SkColorGetG(image_pixel);
+ double img_b = SkColorGetB(image_pixel);
+
+ double img_alpha = static_cast<double>(img_a) / 255.0;
+ double img_inv = 1 - img_alpha;
+
+ double mask_a = static_cast<double>(SkColorGetA(mask_row[x])) / 255.0;
+
+ dst_row[x] = SkColorSetARGB(
+ static_cast<int>(std::min(255.0, bg_a + img_a) * mask_a),
+ static_cast<int>(((bg_r * img_inv) + (img_r * img_alpha)) * mask_a),
+ static_cast<int>(((bg_g * img_inv) + (img_g * img_alpha)) * mask_a),
+ static_cast<int>(((bg_b * img_inv) + (img_b * img_alpha)) * mask_a));
+ }
+ }
+
+ return background;
+}
+
+
+// static
+SkBitmap SkBitmapOperations::CreateHSLShiftedBitmap(
+ const SkBitmap& bitmap,
+ color_utils::HSL hsl_shift) {
+ DCHECK(bitmap.empty() == false);
+ DCHECK(bitmap.config() == SkBitmap::kARGB_8888_Config);
+
+ 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;
+}
+
+// static
+SkBitmap SkBitmapOperations::CreateTiledBitmap(const SkBitmap& source,
+ int src_x, int src_y,
+ int dst_w, int dst_h) {
+ DCHECK(source.getConfig() == SkBitmap::kARGB_8888_Config);
+
+ SkBitmap cropped;
+ cropped.setConfig(SkBitmap::kARGB_8888_Config, dst_w, dst_h, 0);
+ cropped.allocPixels();
+ cropped.eraseARGB(0, 0, 0, 0);
+
+ SkAutoLockPixels lock_source(source);
+ SkAutoLockPixels lock_cropped(cropped);
+
+ // Loop through the pixels of the original bitmap.
+ for (int y = 0; y < dst_h; ++y) {
+ int y_pix = (src_y + y) % source.height();
+ while (y_pix < 0)
+ y_pix += source.height();
+
+ uint32* source_row = source.getAddr32(0, y_pix);
+ uint32* dst_row = cropped.getAddr32(0, y);
+
+ for (int x = 0; x < dst_w; ++x) {
+ int x_pix = (src_x + x) % source.width();
+ while (x_pix < 0)
+ x_pix += source.width();
+
+ dst_row[x] = source_row[x_pix];
+ }
+ }
+
+ return cropped;
+}
+
+// static
+SkBitmap SkBitmapOperations::DownsampleByTwoUntilSize(const SkBitmap& bitmap,
+ int min_w, int min_h) {
+ if ((bitmap.width() <= min_w) || (bitmap.height() <= min_h) ||
+ (min_w < 0) || (min_h < 0))
+ return bitmap;
+
+ // Since bitmaps are refcounted, this copy will be fast.
+ SkBitmap current = bitmap;
+ while ((current.width() >= min_w * 2) && (current.height() >= min_h * 2) &&
+ (current.width() > 1) && (current.height() > 1))
+ current = DownsampleByTwo(current);
+ return current;
+}
+
+// static
+SkBitmap SkBitmapOperations::DownsampleByTwo(const SkBitmap& bitmap) {
+ // Handle the nop case.
+ if ((bitmap.width() <= 1) || (bitmap.height() <= 1))
+ return bitmap;
+
+ SkBitmap result;
+ result.setConfig(SkBitmap::kARGB_8888_Config,
+ (bitmap.width() + 1) / 2, (bitmap.height() + 1) / 2);
+ result.allocPixels();
+
+ SkAutoLockPixels lock(bitmap);
+ for (int dest_y = 0; dest_y < result.height(); ++dest_y) {
+ for (int dest_x = 0; dest_x < result.width(); ++dest_x) {
+ // This code is based on downsampleby2_proc32 in SkBitmap.cpp. It is very
+ // clever in that it does two channels at once: alpha and green ("ag")
+ // and red and blue ("rb"). Each channel gets averaged across 4 pixels
+ // to get the result.
+ int src_x = dest_x << 1;
+ int src_y = dest_y << 1;
+ const SkPMColor* cur_src = bitmap.getAddr32(src_x, src_y);
+ SkPMColor tmp, ag, rb;
+
+ // Top left pixel of the 2x2 block.
+ tmp = *cur_src;
+ ag = (tmp >> 8) & 0xFF00FF;
+ rb = tmp & 0xFF00FF;
+ if (src_x < (bitmap.width() - 1))
+ ++cur_src;
+
+ // Top right pixel of the 2x2 block.
+ tmp = *cur_src;
+ ag += (tmp >> 8) & 0xFF00FF;
+ rb += tmp & 0xFF00FF;
+ if (src_y < (bitmap.height() - 1))
+ cur_src = bitmap.getAddr32(src_x, src_y + 1);
+ else
+ cur_src = bitmap.getAddr32(src_x, src_y); // Move back to the first.
+
+ // Bottom left pixel of the 2x2 block.
+ tmp = *cur_src;
+ ag += (tmp >> 8) & 0xFF00FF;
+ rb += tmp & 0xFF00FF;
+ if (src_x < (bitmap.width() - 1))
+ ++cur_src;
+
+ // Bottom right pixel of the 2x2 block.
+ tmp = *cur_src;
+ ag += (tmp >> 8) & 0xFF00FF;
+ rb += tmp & 0xFF00FF;
+
+ // Put the channels back together, dividing each by 4 to get the average.
+ // |ag| has the alpha and green channels shifted right by 8 bits from
+ // there they should end up, so shifting left by 6 gives them in the
+ // correct position divided by 4.
+ *result.getAddr32(dest_x, dest_y) =
+ ((rb >> 2) & 0xFF00FF) | ((ag << 6) & 0xFF00FF00);
+ }
+ }
+
+ return result;
+}
+
