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Diffstat (limited to 'app/gfx/codec/png_codec.h')
| -rw-r--r-- | app/gfx/codec/png_codec.h | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/app/gfx/codec/png_codec.h b/app/gfx/codec/png_codec.h deleted file mode 100644 index 6460701..0000000 --- a/app/gfx/codec/png_codec.h +++ /dev/null @@ -1,104 +0,0 @@ -// Copyright (c) 2006-2008 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 APP_GFX_CODEC_PNG_CODEC_H_ -#define APP_GFX_CODEC_PNG_CODEC_H_ - -#include <vector> - -#include "base/basictypes.h" - -class SkBitmap; - -namespace gfx { - -// Interface for encoding and decoding PNG data. This is a wrapper around -// libpng, which has an inconvenient interface for callers. This is currently -// designed for use in tests only (where we control the files), so the handling -// isn't as robust as would be required for a browser (see Decode() for more). -// WebKit has its own more complicated PNG decoder which handles, among other -// things, partially downloaded data. -class PNGCodec { - public: - enum ColorFormat { - // 3 bytes per pixel (packed), in RGB order regardless of endianness. - // This is the native JPEG format. - FORMAT_RGB, - - // 4 bytes per pixel, in RGBA order in memory regardless of endianness. - FORMAT_RGBA, - - // 4 bytes per pixel, in BGRA order in memory regardless of endianness. - // This is the default Windows DIB order. - FORMAT_BGRA, - - // 4 bytes per pixel, in pre-multiplied kARGB_8888_Config format. For use - // with directly writing to a skia bitmap. - FORMAT_SkBitmap - }; - - // Encodes the given raw 'input' data, with each pixel being represented as - // given in 'format'. The encoded PNG data will be written into the supplied - // vector and true will be returned on success. On failure (false), the - // contents of the output buffer are undefined. - // - // When writing alpha values, the input colors are assumed to be post - // multiplied. - // - // w, h: dimensions of the image - // row_byte_width: the width in bytes of each row. This may be greater than - // w * bytes_per_pixel if there is extra padding at the end of each row - // (often, each row is padded to the next machine word). - // discard_transparency: when true, and when the input data format includes - // alpha values, these alpha values will be discarded and only RGB will be - // written to the resulting file. Otherwise, alpha values in the input - // will be preserved. - static bool Encode(const unsigned char* input, ColorFormat format, - int w, int h, int row_byte_width, - bool discard_transparency, - std::vector<unsigned char>* output); - - // Call PNGCodec::Encode on the supplied SkBitmap |input|, which is assumed - // to be BGRA, 32 bits per pixel. The params |discard_transparency| and - // |output| are passed directly to Encode; refer to Encode for more - // information. During the call, an SkAutoLockPixels lock is held on |input|. - static bool EncodeBGRASkBitmap(const SkBitmap& input, - bool discard_transparency, - std::vector<unsigned char>* output); - - // Decodes the PNG data contained in input of length input_size. The - // decoded data will be placed in *output with the dimensions in *w and *h - // on success (returns true). This data will be written in the 'format' - // format. On failure, the values of these output variables are undefined. - // - // This function may not support all PNG types, and it hasn't been tested - // with a large number of images, so assume a new format may not work. It's - // really designed to be able to read in something written by Encode() above. - static bool Decode(const unsigned char* input, size_t input_size, - ColorFormat format, std::vector<unsigned char>* output, - int* w, int* h); - - // Decodes the PNG data directly into the passed in SkBitmap. This is - // significantly faster than the vector<unsigned char> version of Decode() - // above when dealing with PNG files that are >500K, which a lot of theme - // images are. (There are a lot of themes that have a NTP image of about ~1 - // megabyte, and those require a 7-10 megabyte side buffer.) - // - // Returns true if data is non-null and can be decoded as a png, false - // otherwise. - static bool Decode(const unsigned char* input, size_t input_size, - SkBitmap* bitmap); - - // Create a SkBitmap from a decoded BGRA DIB. The caller owns the returned - // SkBitmap. - static SkBitmap* CreateSkBitmapFromBGRAFormat( - std::vector<unsigned char>& bgra, int width, int height); - - private: - DISALLOW_COPY_AND_ASSIGN(PNGCodec); -}; - -} // namespace gfx - -#endif // APP_GFX_CODEC_PNG_CODEC_H_ |