| // 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. |
| |
| #ifndef UI_GFX_IMAGE_IMAGE_UTIL_H_ |
| #define UI_GFX_IMAGE_IMAGE_UTIL_H_ |
| |
| #include <vector> |
| |
| #include "base/basictypes.h" |
| #include "ui/gfx/gfx_export.h" |
| |
| namespace gfx { |
| class Image; |
| class ImageSkia; |
| } |
| |
| namespace gfx { |
| |
| // Creates an image from the given JPEG-encoded input. If there was an error |
| // creating the image, returns an IsEmpty() Image. |
| GFX_EXPORT Image ImageFrom1xJPEGEncodedData(const unsigned char* input, |
| size_t input_size); |
| |
| // Fills the |dst| vector with JPEG-encoded bytes of the 1x representation of |
| // the given image. |
| // Returns true if the image has a 1x representation and the 1x representation |
| // was encoded successfully. |
| // |quality| determines the compression level, 0 == lowest, 100 == highest. |
| // Returns true if the Image was encoded successfully. |
| GFX_EXPORT bool JPEG1xEncodedDataFromImage(const Image& image, |
| int quality, |
| std::vector<unsigned char>* dst); |
| |
| // Returns the visible (non-transparent) width of the 1x rep of the given |
| // image. If the image has no transparency, the leading value will be 0 and |
| // the trailing will be the image width. Return values are in the 1x width |
| // pixel units. Margins are given in 0-based column format. So if the image |
| // has only transparent pixels in columns 0, 1, 2, 3, then the leading value |
| // will be 4. Similarly, if there are all transparent pixels in column |
| // width-2, width-1, then the trailing margin value will be width-3. |
| // Returns true if the value is computed from opacity, false if it is a |
| // default value because of null image, missing Rep, etc. |
| // This method is only suitable for fairly small images (i.e. 16x16). |
| // The margins for a completely transparent image will be w/2-1, w/2, but this |
| // will be an expensive operation: it isn't expected that it will be frequently |
| // calculated. |
| GFX_EXPORT bool VisibleMargins(const ImageSkia& image, |
| int* leading, int* trailing); |
| |
| } // namespace gfx |
| |
| #endif // UI_GFX_IMAGE_IMAGE_UTIL_H_ |