1 // Copyright (c) 2012 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. 4 5 #include "ui/gfx/image/image_util.h" 6 7 #include "base/memory/scoped_ptr.h" 8 #include "third_party/skia/include/core/SkBitmap.h" 9 #include "ui/gfx/codec/jpeg_codec.h" 10 #include "ui/gfx/image/image.h" 11 #include "ui/gfx/image/image_skia.h" 12 13 namespace gfx { 14 15 const uint32_t kMinimumVisibleOpacity = 12; 16 17 // The iOS implementations of the JPEG functions are in image_util_ios.mm. 18 #if !defined(OS_IOS) 19 Image ImageFrom1xJPEGEncodedData(const unsigned char* input, 20 size_t input_size) { 21 scoped_ptr<SkBitmap> bitmap(gfx::JPEGCodec::Decode(input, input_size)); 22 if (bitmap.get()) 23 return Image::CreateFrom1xBitmap(*bitmap); 24 25 return Image(); 26 } 27 28 bool JPEG1xEncodedDataFromImage(const Image& image, int quality, 29 std::vector<unsigned char>* dst) { 30 const gfx::ImageSkiaRep& image_skia_rep = 31 image.AsImageSkia().GetRepresentation(1.0f); 32 if (image_skia_rep.scale() != 1.0f) 33 return false; 34 35 const SkBitmap& bitmap = image_skia_rep.sk_bitmap(); 36 SkAutoLockPixels bitmap_lock(bitmap); 37 38 if (!bitmap.readyToDraw()) 39 return false; 40 41 return gfx::JPEGCodec::Encode( 42 reinterpret_cast<unsigned char*>(bitmap.getAddr32(0, 0)), 43 gfx::JPEGCodec::FORMAT_SkBitmap, bitmap.width(), 44 bitmap.height(), 45 static_cast<int>(bitmap.rowBytes()), quality, 46 dst); 47 } 48 #endif // !defined(OS_IOS) 49 50 bool VisibleMargins(const ImageSkia& image, int* leading, int* trailing) { 51 *leading = 0; 52 *trailing = std::max(1, image.width()) - 1; 53 if (!image.HasRepresentation(1.0)) 54 return false; 55 56 const ImageSkiaRep& rep = image.GetRepresentation(1.0); 57 if (rep.is_null()) 58 return false; 59 60 const SkBitmap& bitmap = rep.sk_bitmap(); 61 if (bitmap.isNull() || bitmap.width() == 0) 62 return false; 63 64 if (bitmap.isOpaque()) 65 return true; 66 67 SkAutoLockPixels l(bitmap); 68 int inner_min = bitmap.width(); 69 for (int x = 0; x < bitmap.width(); ++x) { 70 for (int y = 0; y < bitmap.height(); ++y) { 71 if (SkColorGetA(bitmap.getColor(x, y)) > kMinimumVisibleOpacity) { 72 inner_min = x; 73 break; 74 } 75 } 76 if (inner_min < bitmap.width()) 77 break; 78 } 79 80 int inner_max = -1; 81 for (int x = bitmap.width() - 1; x > inner_min; --x) { 82 for (int y = 0; y < bitmap.height(); ++y) { 83 if (SkColorGetA(bitmap.getColor(x, y)) > kMinimumVisibleOpacity) { 84 inner_max = x; 85 break; 86 } 87 } 88 if (inner_max > -1) 89 break; 90 } 91 92 if (inner_min == bitmap.width()) { 93 *leading = bitmap.width()/2; 94 *trailing = bitmap.width()/2 + 1; 95 return true; 96 } 97 98 *leading = inner_min; 99 *trailing = inner_max; 100 return true; 101 } 102 103 } // namespace gfx 104
