Add chrome to the repository.

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@15 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 84 insertions, 0 deletions

diff --git a/chrome/common/jpeg_codec.h b/chrome/common/jpeg_codec.h
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+// Copyright 2008, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//    * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//    * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//    * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#ifndef CHROME_COMMON_JPEG_CODEC_H__
+#define CHROME_COMMON_JPEG_CODEC_H__
+
+#include <vector>
+
+class SkBitmap;
+
+// 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 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
+  };
+
+  // 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);
+};
+
+#endif  // CHROME_COMMON_JPEG_CODEC_H__