| // 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/image/image_util.h" |
| |
| #include "base/memory/scoped_ptr.h" |
| #include "third_party/skia/include/core/SkBitmap.h" |
| #include "ui/gfx/codec/jpeg_codec.h" |
| #include "ui/gfx/image/image.h" |
| #include "ui/gfx/image/image_skia.h" |
| |
| namespace gfx { |
| |
| const uint32_t kMinimumVisibleOpacity = 12; |
| |
| // The iOS implementations of the JPEG functions are in image_util_ios.mm. |
| #if !defined(OS_IOS) |
| Image ImageFrom1xJPEGEncodedData(const unsigned char* input, |
| size_t input_size) { |
| scoped_ptr<SkBitmap> bitmap(gfx::JPEGCodec::Decode(input, input_size)); |
| if (bitmap.get()) |
| return Image::CreateFrom1xBitmap(*bitmap); |
| |
| return Image(); |
| } |
| |
| bool JPEG1xEncodedDataFromImage(const Image& image, int quality, |
| std::vector<unsigned char>* dst) { |
| const gfx::ImageSkiaRep& image_skia_rep = |
| image.AsImageSkia().GetRepresentation(1.0f); |
| if (image_skia_rep.scale() != 1.0f) |
| return false; |
| |
| const SkBitmap& bitmap = image_skia_rep.sk_bitmap(); |
| SkAutoLockPixels bitmap_lock(bitmap); |
| |
| if (!bitmap.readyToDraw()) |
| return false; |
| |
| return gfx::JPEGCodec::Encode( |
| reinterpret_cast<unsigned char*>(bitmap.getAddr32(0, 0)), |
| gfx::JPEGCodec::FORMAT_SkBitmap, bitmap.width(), |
| bitmap.height(), |
| static_cast<int>(bitmap.rowBytes()), quality, |
| dst); |
| } |
| #endif // !defined(OS_IOS) |
| |
| bool VisibleMargins(const ImageSkia& image, int* leading, int* trailing) { |
| *leading = 0; |
| *trailing = std::max(1, image.width()) - 1; |
| if (!image.HasRepresentation(1.0)) |
| return false; |
| |
| const ImageSkiaRep& rep = image.GetRepresentation(1.0); |
| if (rep.is_null()) |
| return false; |
| |
| const SkBitmap& bitmap = rep.sk_bitmap(); |
| if (bitmap.isNull() || bitmap.width() == 0) |
| return false; |
| |
| if (bitmap.isOpaque()) |
| return true; |
| |
| SkAutoLockPixels l(bitmap); |
| int inner_min = bitmap.width(); |
| for (int x = 0; x < bitmap.width(); ++x) { |
| for (int y = 0; y < bitmap.height(); ++y) { |
| if (SkColorGetA(bitmap.getColor(x, y)) > kMinimumVisibleOpacity) { |
| inner_min = x; |
| break; |
| } |
| } |
| if (inner_min < bitmap.width()) |
| break; |
| } |
| |
| int inner_max = -1; |
| for (int x = bitmap.width() - 1; x > inner_min; --x) { |
| for (int y = 0; y < bitmap.height(); ++y) { |
| if (SkColorGetA(bitmap.getColor(x, y)) > kMinimumVisibleOpacity) { |
| inner_max = x; |
| break; |
| } |
| } |
| if (inner_max > -1) |
| break; |
| } |
| |
| if (inner_min == bitmap.width()) { |
| *leading = bitmap.width()/2; |
| *trailing = bitmap.width()/2 + 1; |
| return true; |
| } |
| |
| *leading = inner_min; |
| *trailing = inner_max; |
| return true; |
| } |
| |
| } // namespace gfx |