1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
5 #include "components/favicon_base/favicon_util.h"
12 #include "base/trace_event/trace_event.h"
13 #include "build/build_config.h"
14 #include "components/favicon_base/favicon_types.h"
15 #include "components/favicon_base/select_favicon_frames.h"
16 #include "skia/ext/image_operations.h"
17 #include "third_party/skia/include/core/SkBitmap.h"
18 #include "third_party/skia/include/core/SkCanvas.h"
19 #include "ui/base/layout.h"
20 #include "ui/gfx/codec/png_codec.h"
21 #include "ui/gfx/favicon_size.h"
22 #include "ui/gfx/geometry/size.h"
23 #include "ui/gfx/image/image_png_rep.h"
24 #include "ui/gfx/image/image_skia.h"
26 #if defined(OS_MACOSX) && !defined(OS_IOS)
27 #include "base/mac/mac_util.h"
28 #endif // defined(OS_MACOSX) && !defined(OS_IOS)
30 namespace favicon_base {
33 // Creates image reps of DIP size |favicon_size| for the subset of
34 // |favicon_scales| for which the image reps can be created without resizing
35 // or decoding the bitmap data.
36 std::vector<gfx::ImagePNGRep> SelectFaviconFramesFromPNGsWithoutResizing(
37 const std::vector<favicon_base::FaviconRawBitmapResult>& png_data,
38 const std::vector<float>& favicon_scales,
40 TRACE_EVENT0("browser",
41 "FaviconUtil::SelectFaviconFramesFromPNGsWithoutResizing");
42 std::vector<gfx::ImagePNGRep> png_reps;
46 // A |favicon_size| of 0 indicates that the largest frame is desired.
47 if (favicon_size == 0) {
49 scoped_refptr<base::RefCountedMemory> best_candidate;
50 for (size_t i = 0; i < png_data.size(); ++i) {
51 int area = png_data[i].pixel_size.GetArea();
52 if (area > maximum_area) {
54 best_candidate = png_data[i].bitmap_data;
57 png_reps.push_back(gfx::ImagePNGRep(best_candidate, 1.0f));
61 // Build a map which will be used to determine the scale used to
62 // create a bitmap with given pixel size.
63 std::map<int, float> desired_pixel_sizes;
64 for (size_t i = 0; i < favicon_scales.size(); ++i) {
66 static_cast<int>(std::ceil(favicon_size * favicon_scales[i]));
67 desired_pixel_sizes[pixel_size] = favicon_scales[i];
70 for (size_t i = 0; i < png_data.size(); ++i) {
71 if (!png_data[i].is_valid())
74 const gfx::Size& pixel_size = png_data[i].pixel_size;
75 if (pixel_size.width() != pixel_size.height())
78 auto it = desired_pixel_sizes.find(pixel_size.width());
79 if (it == desired_pixel_sizes.end())
82 png_reps.push_back(gfx::ImagePNGRep(png_data[i].bitmap_data, it->second));
88 // Returns a resampled bitmap of |desired_size| x |desired_size| by resampling
89 // the best bitmap out of |input_bitmaps|.
90 // ResizeBitmapByDownsamplingIfPossible() is similar to SelectFaviconFrames()
91 // but it operates on bitmaps which have already been resampled via
92 // SelectFaviconFrames().
93 SkBitmap ResizeBitmapByDownsamplingIfPossible(
94 const std::vector<SkBitmap>& input_bitmaps,
96 DCHECK(!input_bitmaps.empty());
97 DCHECK_NE(0, desired_size);
100 for (size_t i = 0; i < input_bitmaps.size(); ++i) {
101 const SkBitmap& input_bitmap = input_bitmaps[i];
102 if (input_bitmap.width() == desired_size &&
103 input_bitmap.height() == desired_size) {
105 } else if (best_bitmap.isNull()) {
106 best_bitmap = input_bitmap;
107 } else if (input_bitmap.width() >= best_bitmap.width() &&
108 input_bitmap.height() >= best_bitmap.height()) {
109 if (best_bitmap.width() < desired_size ||
110 best_bitmap.height() < desired_size) {
111 best_bitmap = input_bitmap;
114 if (input_bitmap.width() >= desired_size &&
115 input_bitmap.height() >= desired_size) {
116 best_bitmap = input_bitmap;
121 if (desired_size % best_bitmap.width() == 0 &&
122 desired_size % best_bitmap.height() == 0) {
123 // Use nearest neighbour resampling if upsampling by an integer. This
124 // makes the result look similar to the result of SelectFaviconFrames().
126 bitmap.allocN32Pixels(desired_size, desired_size);
127 if (!best_bitmap.isOpaque())
128 bitmap.eraseARGB(0, 0, 0, 0);
130 SkCanvas canvas(bitmap);
131 canvas.drawBitmapRect(best_bitmap,
132 SkRect::MakeIWH(desired_size, desired_size), nullptr);
135 return skia::ImageOperations::Resize(best_bitmap,
136 skia::ImageOperations::RESIZE_LANCZOS3,
143 std::vector<float> GetFaviconScales() {
144 const float kScale1x = 1.0f;
145 std::vector<ui::ScaleFactor> resource_scale_factors =
146 ui::GetSupportedScaleFactors();
148 // TODO(ios): 1.0f should not be necessary on iOS retina devices. However
149 // the sync service only supports syncing 100p favicons. Until sync supports
150 // other scales 100p is needed in the list of scales to retrieve and
151 // store the favicons in both 100p for sync and 200p for display. cr/160503.
152 std::vector<float> favicon_scales(1, kScale1x);
153 for (size_t i = 0; i < resource_scale_factors.size(); ++i) {
154 if (resource_scale_factors[i] != ui::SCALE_FACTOR_100P)
155 favicon_scales.push_back(
156 ui::GetScaleForScaleFactor(resource_scale_factors[i]));
158 return favicon_scales;
161 void SetFaviconColorSpace(gfx::Image* image) {
162 #if defined(OS_MACOSX) && !defined(OS_IOS)
163 image->SetSourceColorSpace(base::mac::GetSystemColorSpace());
164 #endif // defined(OS_MACOSX) && !defined(OS_IOS)
167 gfx::Image SelectFaviconFramesFromPNGs(
168 const std::vector<favicon_base::FaviconRawBitmapResult>& png_data,
169 const std::vector<float>& favicon_scales,
171 TRACE_EVENT0("browser", "FaviconUtil::SelectFaviconFramesFromPNGs");
173 // Create image reps for as many scales as possible without resizing
174 // the bitmap data or decoding it. FaviconHandler stores already resized
175 // favicons into history so no additional resizing should be needed in the
177 // Creating the gfx::Image from |png_data| without resizing or decoding if
178 // possible is important because:
179 // - Sync does a byte-to-byte comparison of gfx::Image::As1xPNGBytes() to
180 // the data it put into the database in order to determine whether any
181 // updates should be pushed to sync.
182 // - The decoding occurs on the UI thread and the decoding can be a
183 // significant performance hit if a user has many bookmarks.
184 // TODO(pkotwicz): Move the decoding off the UI thread.
185 std::vector<gfx::ImagePNGRep> png_reps =
186 SelectFaviconFramesFromPNGsWithoutResizing(
187 png_data, favicon_scales, favicon_size);
189 // SelectFaviconFramesFromPNGsWithoutResizing() should have selected the
190 // largest favicon if |favicon_size| == 0.
191 if (favicon_size == 0)
192 return gfx::Image(png_reps);
194 std::vector<float> favicon_scales_to_generate = favicon_scales;
195 for (size_t i = 0; i < png_reps.size(); ++i) {
196 auto iter = std::find(favicon_scales_to_generate.begin(),
197 favicon_scales_to_generate.end(), png_reps[i].scale);
198 if (iter != favicon_scales_to_generate.end())
199 favicon_scales_to_generate.erase(iter);
202 if (favicon_scales_to_generate.empty())
203 return gfx::Image(png_reps);
205 std::vector<SkBitmap> bitmaps;
206 for (size_t i = 0; i < png_data.size(); ++i) {
207 if (!png_data[i].is_valid())
211 if (gfx::PNGCodec::Decode(png_data[i].bitmap_data->front(),
212 png_data[i].bitmap_data->size(),
214 bitmaps.push_back(bitmap);
221 gfx::ImageSkia resized_image_skia;
222 for (size_t i = 0; i < favicon_scales_to_generate.size(); ++i) {
223 float scale = favicon_scales_to_generate[i];
224 int desired_size_in_pixel =
225 static_cast<int>(std::ceil(favicon_size * scale));
227 ResizeBitmapByDownsamplingIfPossible(bitmaps, desired_size_in_pixel);
228 resized_image_skia.AddRepresentation(gfx::ImageSkiaRep(bitmap, scale));
231 if (png_reps.empty())
232 return gfx::Image(resized_image_skia);
234 std::vector<gfx::ImageSkiaRep> resized_image_skia_reps =
235 resized_image_skia.image_reps();
236 for (size_t i = 0; i < resized_image_skia_reps.size(); ++i) {
237 scoped_refptr<base::RefCountedBytes> png_bytes(new base::RefCountedBytes());
238 if (gfx::PNGCodec::EncodeBGRASkBitmap(
239 resized_image_skia_reps[i].GetBitmap(), false,
240 &png_bytes->data())) {
242 gfx::ImagePNGRep(png_bytes, resized_image_skia_reps[i].scale()));
246 return gfx::Image(png_reps);
249 favicon_base::FaviconRawBitmapResult ResizeFaviconBitmapResult(
250 const std::vector<favicon_base::FaviconRawBitmapResult>&
251 favicon_bitmap_results,
252 int desired_size_in_pixel) {
253 TRACE_EVENT0("browser", "FaviconUtil::ResizeFaviconBitmapResult");
255 if (favicon_bitmap_results.empty() || !favicon_bitmap_results[0].is_valid())
256 return favicon_base::FaviconRawBitmapResult();
258 favicon_base::FaviconRawBitmapResult bitmap_result =
259 favicon_bitmap_results[0];
261 // If the desired size is 0, SelectFaviconFrames() will return the largest
262 // bitmap without doing any resizing. As |favicon_bitmap_results| has bitmap
263 // data for a single bitmap, return it and avoid an unnecessary decode.
264 if (desired_size_in_pixel == 0)
265 return bitmap_result;
267 // If history bitmap is already desired pixel size, return early.
268 if (bitmap_result.pixel_size.width() == desired_size_in_pixel &&
269 bitmap_result.pixel_size.height() == desired_size_in_pixel)
270 return bitmap_result;
272 // Convert raw bytes to SkBitmap, resize via SelectFaviconFrames(), then
274 std::vector<float> desired_favicon_scales;
275 desired_favicon_scales.push_back(1.0f);
277 gfx::Image resized_image = favicon_base::SelectFaviconFramesFromPNGs(
278 favicon_bitmap_results, desired_favicon_scales, desired_size_in_pixel);
280 std::vector<unsigned char> resized_bitmap_data;
281 if (!gfx::PNGCodec::EncodeBGRASkBitmap(resized_image.AsBitmap(), false,
282 &resized_bitmap_data)) {
283 return favicon_base::FaviconRawBitmapResult();
286 bitmap_result.bitmap_data = base::RefCountedBytes::TakeVector(
287 &resized_bitmap_data);
288 bitmap_result.pixel_size =
289 gfx::Size(desired_size_in_pixel, desired_size_in_pixel);
291 return bitmap_result;
294 } // namespace favicon_base