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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 <memory>
- #include <vector>
- #include "third_party/skia/include/core/SkImageInfo.h"
- #include "third_party/skia/include/core/SkPixmap.h"
- #include "third_party/skia/include/encode/SkJpegEncoder.h"
- #include "ui/gfx/codec/codec_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 CODEC_EXPORT JPEGCodec {
- public:
- enum ColorFormat {
- // 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
- };
- // Encodes the given raw 'input' pixmap, which includes a pointer to pixels
- // as well as information describing the pixel 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.
- //
- // downsample: specifies how pixels will be sampled in the encoded JPEG image,
- // can be either k420, k422 or k444.
- // quality: an integer in the range 0-100, where 100 is the highest quality.
- static bool Encode(const SkPixmap& input,
- int quality,
- SkJpegEncoder::Downsample downsample,
- std::vector<unsigned char>* output);
- // Encodes the given raw 'input' pixmap, which includes a pointer to pixels
- // as well as information describing the pixel 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.
- //
- // quality: an integer in the range 0-100, where 100 is the highest quality.
- static bool Encode(const SkPixmap& input,
- int quality,
- std::vector<unsigned char>* output);
- // Encodes the 'input' bitmap. 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.
- //
- // quality: an integer in the range 0-100, where 100 is the highest quality.
- static bool Encode(const SkBitmap& input,
- 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.
- static std::unique_ptr<SkBitmap> Decode(const unsigned char* input,
- size_t input_size);
- };
- } // namespace gfx
- #endif // UI_GFX_CODEC_JPEG_CODEC_H_
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