From 267c03d478d9c83ef8c37999f3abb1cd822881ff Mon Sep 17 00:00:00 2001 From: "sail@chromium.org" Date: Wed, 2 Feb 2011 23:03:07 +0000 Subject: Move src/gfx/ to src/ui/gfx To reduce the size of this change I've left stub header files in src/gfx/. Once all includes have been updated I'll delete the stub files. BUG=71063 TEST=Still doing test builds. Review URL: http://codereview.chromium.org/6246027 git-svn-id: svn://svn.chromium.org/chrome/trunk/src@73530 0039d316-1c4b-4281-b951-d872f2087c98 --- ui/gfx/codec/png_codec.h | 105 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 105 insertions(+) create mode 100644 ui/gfx/codec/png_codec.h (limited to 'ui/gfx/codec/png_codec.h') diff --git a/ui/gfx/codec/png_codec.h b/ui/gfx/codec/png_codec.h new file mode 100644 index 0000000..73453fe --- /dev/null +++ b/ui/gfx/codec/png_codec.h @@ -0,0 +1,105 @@ +// 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 UI_GFX_CODEC_PNG_CODEC_H_ +#define UI_GFX_CODEC_PNG_CODEC_H_ +#pragma once + +#include + +#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* 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* 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* output, + int* w, int* h); + + // Decodes the PNG data directly into the passed in SkBitmap. This is + // significantly faster than the vector 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& bgra, int width, int height); + + private: + DISALLOW_COPY_AND_ASSIGN(PNGCodec); +}; + +} // namespace gfx + +#endif // UI_GFX_CODEC_PNG_CODEC_H_ -- cgit v1.1