michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef YUV_STAMPER_H_
michael@0: #define YUV_STAMPER_H_
michael@0: 
michael@0: #include "nptypes.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: class
michael@0: YuvStamper {
michael@0: public:
michael@0:   bool WriteDigits(uint32_t value);
michael@0: 
michael@0:   template<typename T>
michael@0:   static bool Write(uint32_t width, uint32_t height, uint32_t stride,
michael@0:                     unsigned char *pYData, const T& value,
michael@0:                     uint32_t x=0, uint32_t y=0)
michael@0:   {
michael@0:     YuvStamper stamper(pYData, width, height, stride,
michael@0: 		       x, y,
michael@0: 		       (sDigitWidth + sInterDigit) * sPixelSize,
michael@0: 		       (sDigitHeight + sInterLine) * sPixelSize);
michael@0:     return stamper.WriteDigits(value);
michael@0:   }
michael@0: 
michael@0:   static bool Encode(uint32_t width, uint32_t height, uint32_t stride,
michael@0: 		     unsigned char* pYData, unsigned char* pMsg, size_t msg_len,
michael@0: 		     uint32_t x = 0, uint32_t y = 0);
michael@0: 
michael@0:   static bool Decode(uint32_t width, uint32_t height, uint32_t stride,
michael@0: 		     unsigned char* pYData, unsigned char* pMsg, size_t msg_len,
michael@0: 		     uint32_t x = 0, uint32_t y = 0);
michael@0: 
michael@0:  private:
michael@0:   YuvStamper(unsigned char* pYData,
michael@0: 	     uint32_t width, uint32_t height, uint32_t stride,
michael@0: 	     uint32_t x, uint32_t y,
michael@0: 	     unsigned char symbol_width, unsigned char symbol_height);
michael@0: 
michael@0:   bool WriteDigit(unsigned char digit);
michael@0:   void WritePixel(unsigned char* data, uint32_t x, uint32_t y);
michael@0:   uint32_t Capacity();
michael@0:   bool AdvanceCursor();
michael@0:   bool WriteBit(bool one);
michael@0:   bool Write8(unsigned char value);
michael@0:   bool ReadBit(unsigned char &value);
michael@0:   bool Read8(unsigned char &bit);
michael@0: 
michael@0:   const static unsigned char sPixelSize = 3;
michael@0:   const static unsigned char sDigitWidth = 6;
michael@0:   const static unsigned char sDigitHeight = 7;
michael@0:   const static unsigned char sInterDigit = 1;
michael@0:   const static unsigned char sInterLine = 1;
michael@0:   const static uint32_t sBitSize = 4;
michael@0:   const static uint32_t sBitThreshold = 60;
michael@0:   const static unsigned char sYOn = 0x80;
michael@0:   const static unsigned char sYOff = 0;
michael@0:   const static unsigned char sLumaThreshold = 96;
michael@0:   const static unsigned char sLumaMin = 16;
michael@0:   const static unsigned char sLumaMax = 235;
michael@0: 
michael@0:   unsigned char* pYData;
michael@0:   uint32_t mStride;
michael@0:   uint32_t mWidth;
michael@0:   uint32_t mHeight;
michael@0:   unsigned char mSymbolWidth;
michael@0:   unsigned char mSymbolHeight;
michael@0: 
michael@0:   struct Cursor {
michael@0:     Cursor(uint32_t x, uint32_t y):
michael@0:       x(x), y(y) {}
michael@0:     uint32_t x;
michael@0:     uint32_t y;
michael@0:   } mCursor;
michael@0: };
michael@0: 
michael@0: }
michael@0: 
michael@0: #endif
michael@0: