gui_gif_private.h

ucgu最新版本 4.14

/*********************************************************************
*                SEGGER MICROCONTROLLER SYSTEME GmbH                 *
*        Solutions for real time microcontroller applications        *
**********************************************************************
*                                                                    *
*        (c) 1996 - 2007  SEGGER Microcontroller Systeme GmbH        *
*                                                                    *
*        Internet: www.segger.com    Support:  [e-mail]    *
*                                                                    *
**********************************************************************

** emWin V4.14 - Graphical user interface for embedded applications **
emWin is protected by international copyright laws.   Knowledge of the
source code may not be used to write a similar product.  This file may
only be used in accordance with a license and should not be re-
distributed in any way. We appreciate your understanding and fairness.
----------------------------------------------------------------------
File        : GUI_GIF_Private.h
Purpose     : Private header file for GUI_GIF... functions
---------------------------END-OF-HEADER------------------------------
*/

#ifndef GUI_GIF_PRIVATE_H
#define GUI_GIF_PRIVATE_H

#include "GUI_Private.h"

#if GUI_COMPILER_SUPPORTS_FP

/*********************************************************************
*
*       Defines
*
**********************************************************************
*/
#define MAX_NUM_LWZ_BITS 12

/*********************************************************************
*
*       Types
*
**********************************************************************
*/
typedef struct {
  U8    aBuffer[258];                     /* Input buffer for data block */
  short aCode  [(1 << MAX_NUM_LWZ_BITS)]; /* This array stores the LZW codes for the compressed strings */
  U8    aPrefix[(1 << MAX_NUM_LWZ_BITS)]; /* Prefix character of the LZW code. */
  U8    aDecompBuffer[3000];              /* Decompression buffer. The higher the compression, the more bytes are needed in the buffer. */
  U8 *  sp;                               /* Pointer into the decompression buffer */
  int   CurBit;
  int   LastBit;
  int   GetDone;
  int   LastByte;
  int   ReturnClear;
  int   CodeSize;
  int   SetCodeSize;
  int   MaxCode;
  int   MaxCodeSize;
  int   ClearCode;
  int   EndCode;
  int   FirstCode;
  int   OldCode;
} LZW_CONTEXT;

typedef struct {
  int XPos;
  int YPos;
  int XSize;
  int YSize;
  int Flags;
  int NumColors;
} IMAGE_DESCRIPTOR;

/* Default parameter structure for reading data from memory */
typedef struct {
  const U8 * pFileData;
  U32   FileSize;
  U32   Off;
} GUI_GIF_PARAM;

/* Context structure for getting stdio input */
typedef struct {
  unsigned                NumBytesInBuffer; /* Remaining bytes in buffer */
  const U8              * pBuffer;          /* Pointer into buffer for reading data */
  GUI_GIF_GET_DATA_FUNC * fpGetData;        /* Function pointer */
  void                  * pParam;           /* Parameter pointer passed to function */
} GUI_GIF_CONTEXT;

typedef int  DRAW_FROM_DATABLOCK(GUI_GIF_CONTEXT * pContext, IMAGE_DESCRIPTOR * pDescriptor, int x0, int y0, int Transparency, int Disposal, int Num, int Denom);
typedef void CLEAR_UNUSED_PIXELS(int x0, int y0, IMAGE_DESCRIPTOR * pDescriptor, GUI_GIF_IMAGE_INFO * pInfo, int Num, int Denom);

/*********************************************************************
*
*       Private data
*
**********************************************************************
*/
extern       GUI_COLOR GUI_GIF__aColorTable[256];
extern       LZW_CONTEXT GUI_GIF__LZWContext;
extern const int GUI_GIF__aInterlaceOffset[4];
extern const int GUI_GIF__aInterlaceYPos[4];

/*********************************************************************
*
*       Interface
*
**********************************************************************
*/
int  GUI_GIF__ReadData(GUI_GIF_CONTEXT * pContext, unsigned NumBytes, const U8 ** ppData, unsigned StartOfFile);
int  GUI_GIF__GetData (void * p, int NumBytesReq, const U8 ** ppData, unsigned StartOfFile);
int  GUI_GIF__DrawFromFilePointer(GUI_GIF_CONTEXT * pContext, int x0, int y0, int Index, int Num, int Denom, DRAW_FROM_DATABLOCK pfDrawFromDataBlock, CLEAR_UNUSED_PIXELS pfClearUnusedPixels);
void GUI_GIF__InitLZW(int InputCodeSize);
int  GUI_GIF__GetNextByte(GUI_GIF_CONTEXT * pContext);

#endif /* GUI_COMPILER_SUPPORTS_FP */

#endif /* GUI_GIF_PRIVATE_H */