75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
#ifndef YuvToJpegEncoder_DEFINED
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#define YuvToJpegEncoder_DEFINED
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#include "SkTypes.h"
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#include "SkStream.h"
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extern "C" {
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#include "jpeglib.h"
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#include "jerror.h"
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}
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class YuvToJpegEncoder {
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public:
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/** Create an encoder based on the YUV format.
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*
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* @param pixelFormat The yuv pixel format as defined in ui/PixelFormat.h.
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* @param strides The number of row bytes in each image plane.
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* @return an encoder based on the pixelFormat.
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*/
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static YuvToJpegEncoder* create(int pixelFormat, int* strides);
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YuvToJpegEncoder(int* strides);
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/** Encode YUV data to jpeg, which is output to a stream.
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*
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* @param stream The jpeg output stream.
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* @param inYuv The input yuv data.
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* @param width Width of the the Yuv data in terms of pixels.
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* @param height Height of the Yuv data in terms of pixels.
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* @param offsets The offsets in each image plane with respect to inYuv.
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* @param jpegQuality Picture quality in [0, 100].
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* @return true if successfully compressed the stream.
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*/
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bool encode(SkWStream* stream, void* inYuv, int width,
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int height, int* offsets, int jpegQuality);
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virtual ~YuvToJpegEncoder() {}
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protected:
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int fNumPlanes;
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int* fStrides;
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void setJpegCompressStruct(jpeg_compress_struct* cinfo, int width,
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int height, int quality);
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virtual void configSamplingFactors(jpeg_compress_struct* cinfo) = 0;
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virtual void compress(jpeg_compress_struct* cinfo,
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uint8_t* yuv, int* offsets) = 0;
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};
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class Yuv420SpToJpegEncoder : public YuvToJpegEncoder {
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public:
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Yuv420SpToJpegEncoder(int* strides);
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virtual ~Yuv420SpToJpegEncoder() {}
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private:
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void configSamplingFactors(jpeg_compress_struct* cinfo);
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void deinterleaveYuv(uint8_t* yuv, int width, int height,
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uint8_t*& yPlanar, uint8_t*& uPlanar, uint8_t*& vPlanar);
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void deinterleave(uint8_t* vuPlanar, uint8_t* uRows, uint8_t* vRows,
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int rowIndex, int width);
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void compress(jpeg_compress_struct* cinfo, uint8_t* yuv, int* offsets);
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};
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class Yuv422IToJpegEncoder : public YuvToJpegEncoder {
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public:
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Yuv422IToJpegEncoder(int* strides);
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virtual ~Yuv422IToJpegEncoder() {}
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private:
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void configSamplingFactors(jpeg_compress_struct* cinfo);
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void compress(jpeg_compress_struct* cinfo, uint8_t* yuv, int* offsets);
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void deinterleave(uint8_t* yuv, uint8_t* yRows, uint8_t* uRows,
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uint8_t* vRows, int rowIndex, int width, int height);
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};
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#endif
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