1 #ifndef YuvToJpegEncoder_DEFINED 2 #define YuvToJpegEncoder_DEFINED 3 4 #include "SkTypes.h" 5 #include "SkStream.h" 6 extern "C" { 7 #include "jpeglib.h" 8 #include "jerror.h" 9 } 10 11 class YuvToJpegEncoder { 12 public: 13 /** Create an encoder based on the YUV format. 14 * 15 * @param pixelFormat The yuv pixel format as defined in ui/PixelFormat.h. 16 * @param strides The number of row bytes in each image plane. 17 * @return an encoder based on the pixelFormat. 18 */ 19 static YuvToJpegEncoder* create(int pixelFormat, int* strides); 20 21 YuvToJpegEncoder(int* strides); 22 23 /** Encode YUV data to jpeg, which is output to a stream. 24 * 25 * @param stream The jpeg output stream. 26 * @param inYuv The input yuv data. 27 * @param width Width of the the Yuv data in terms of pixels. 28 * @param height Height of the Yuv data in terms of pixels. 29 * @param offsets The offsets in each image plane with respect to inYuv. 30 * @param jpegQuality Picture quality in [0, 100]. 31 * @return true if successfully compressed the stream. 32 */ 33 bool encode(SkWStream* stream, void* inYuv, int width, 34 int height, int* offsets, int jpegQuality); 35 36 virtual ~YuvToJpegEncoder() {} 37 38 protected: 39 int fNumPlanes; 40 int* fStrides; 41 void setJpegCompressStruct(jpeg_compress_struct* cinfo, int width, 42 int height, int quality); 43 virtual void configSamplingFactors(jpeg_compress_struct* cinfo) = 0; 44 virtual void compress(jpeg_compress_struct* cinfo, 45 uint8_t* yuv, int* offsets) = 0; 46 }; 47 48 class Yuv420SpToJpegEncoder : public YuvToJpegEncoder { 49 public: 50 Yuv420SpToJpegEncoder(int* strides); 51 virtual ~Yuv420SpToJpegEncoder() {} 52 53 private: 54 void configSamplingFactors(jpeg_compress_struct* cinfo); 55 void deinterleaveYuv(uint8_t* yuv, int width, int height, 56 uint8_t*& yPlanar, uint8_t*& uPlanar, uint8_t*& vPlanar); 57 void deinterleave(uint8_t* vuPlanar, uint8_t* uRows, uint8_t* vRows, 58 int rowIndex, int width); 59 void compress(jpeg_compress_struct* cinfo, uint8_t* yuv, int* offsets); 60 }; 61 62 class Yuv422IToJpegEncoder : public YuvToJpegEncoder { 63 public: 64 Yuv422IToJpegEncoder(int* strides); 65 virtual ~Yuv422IToJpegEncoder() {} 66 67 private: 68 void configSamplingFactors(jpeg_compress_struct* cinfo); 69 void compress(jpeg_compress_struct* cinfo, uint8_t* yuv, int* offsets); 70 void deinterleave(uint8_t* yuv, uint8_t* yRows, uint8_t* uRows, 71 uint8_t* vRows, int rowIndex, int width, int height); 72 }; 73 74 #endif 75
