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+// Copyright (c) 2011 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_JPEG_CODEC_H_
+#define UI_GFX_CODEC_JPEG_CODEC_H_
+
+#include <stddef.h>
+#include <vector>
+
+#include "ui/base/ui_export.h"
+
+class SkBitmap;
+
+namespace gfx {
+
+// Interface for encoding/decoding JPEG data. This is a wrapper around libjpeg,
+// which has an inconvenient interface for callers. This is only used for UI
+// elements, WebKit has its own more complicated JPEG decoder which handles,
+// among other things, partially downloaded data.
+class UI_EXPORT JPEGCodec {
+ 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 mem regardless of endianness.
+ FORMAT_RGBA,
+
+ // 4 bytes per pixel, in BGRA order in mem regardless of endianness.
+ // This is the default Windows DIB order.
+ FORMAT_BGRA,
+
+ // 4 bytes per pixel, it can be either RGBA or BGRA. It depends on the bit
+ // order in kARGB_8888_Config skia bitmap.
+ FORMAT_SkBitmap
+ };
+
+ enum LibraryVariant {
+ SYSTEM_LIBJPEG = 0,
+ LIBJPEG_TURBO,
+ IJG_LIBJPEG,
+ };
+
+ // This method helps identify at run time which library chromium is using.
+ static LibraryVariant JpegLibraryVariant();
+
+ // Encodes the given raw 'input' data, with each pixel being represented as
+ // given in 'format'. The encoded JPEG 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.
+ //
+ // 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).
+ // quality: an integer in the range 0-100, where 100 is the highest quality.
+ static bool Encode(const unsigned char* input, ColorFormat format,
+ int w, int h, int row_byte_width,
+ int quality, std::vector<unsigned char>* output);
+
+ // Decodes the JPEG 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 is undefined.
+ static bool Decode(const unsigned char* input, size_t input_size,
+ ColorFormat format, std::vector<unsigned char>* output,
+ int* w, int* h);
+
+ // Decodes the JPEG data contained in input of length input_size. If
+ // successful, a SkBitmap is created and returned. It is up to the caller
+ // to delete the returned bitmap.
+ static SkBitmap* Decode(const unsigned char* input, size_t input_size);
+};
+
+} // namespace gfx
+
+#endif // UI_GFX_CODEC_JPEG_CODEC_H_