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 #ifndef UI_GFX_IMAGE_IMAGE_UTIL_H_ 6 #define UI_GFX_IMAGE_IMAGE_UTIL_H_ 7 8 #include <vector> 9 10 #include "base/basictypes.h" 11 #include "ui/gfx/gfx_export.h" 12 13 namespace gfx { 14 class Image; 15 class ImageSkia; 16 } 17 18 namespace gfx { 19 20 // Creates an image from the given JPEG-encoded input. If there was an error 21 // creating the image, returns an IsEmpty() Image. 22 GFX_EXPORT Image ImageFrom1xJPEGEncodedData(const unsigned char* input, 23 size_t input_size); 24 25 // Fills the |dst| vector with JPEG-encoded bytes of the 1x representation of 26 // the given image. 27 // Returns true if the image has a 1x representation and the 1x representation 28 // was encoded successfully. 29 // |quality| determines the compression level, 0 == lowest, 100 == highest. 30 // Returns true if the Image was encoded successfully. 31 GFX_EXPORT bool JPEG1xEncodedDataFromImage(const Image& image, 32 int quality, 33 std::vector<unsigned char>* dst); 34 35 // Returns the visible (non-transparent) width of the 1x rep of the given 36 // image. If the image has no transparency, the leading value will be 0 and 37 // the trailing will be the image width. Return values are in the 1x width 38 // pixel units. Margins are given in 0-based column format. So if the image 39 // has only transparent pixels in columns 0, 1, 2, 3, then the leading value 40 // will be 4. Similarly, if there are all transparent pixels in column 41 // width-2, width-1, then the trailing margin value will be width-3. 42 // Returns true if the value is computed from opacity, false if it is a 43 // default value because of null image, missing Rep, etc. 44 // This method is only suitable for fairly small images (i.e. 16x16). 45 // The margins for a completely transparent image will be w/2-1, w/2, but this 46 // will be an expensive operation: it isn't expected that it will be frequently 47 // calculated. 48 GFX_EXPORT bool VisibleMargins(const ImageSkia& image, 49 int* leading, int* trailing); 50 51 } // namespace gfx 52 53 #endif // UI_GFX_IMAGE_IMAGE_UTIL_H_ 54