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 13namespace gfx { 14class Image; 15class ImageSkia; 16} 17 18namespace 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. 22GFX_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. 31GFX_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. 48GFX_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