www.pudn.com > uC-GUI-V3-98.zip > 2DGL_DrawJPEGScaled.c

/* 
********************************************************************************************************* 
*                                             uC/GUI V3.98 
*                        Universal graphic software for embedded applications 
* 
*                       (c) Copyright 2002, Micrium Inc., Weston, FL 
*                       (c) Copyright 2002, SEGGER Microcontroller Systeme GmbH 
* 
*              µC/GUI 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 redistributed 
*              in any way. We appreciate your understanding and fairness. 
* 
---------------------------------------------------------------------- 
File        : 2DGL_DrawJPEGScaled.c 
Purpose     : Example for drawing scaled JPG files without loading 
              them into memory 
---------------------------------------------------------------------- 
*/ 
 
#include  
#include  
 
#include "GUI.h" 
#include "EDIT.h" 
 
/********************************************************************* 
* 
*       Static data 
* 
********************************************************************** 
*/ 
static char _acBuffer[0x200]; 
 
/********************************************************************* 
* 
*       Static code 
* 
********************************************************************** 
*/ 
/********************************************************************* 
* 
*       _GetData 
* 
* Purpose: 
*   This routine is called by GUI_JPEG_DrawEx(). The routine is responsible 
*   for setting the data pointer to a valid data location with at least 
*   one valid byte. 
* 
* Parameters: 
*   p           - Pointer to application defined data. 
*   NumBytesReq - Number of bytes requested. 
*   ppData      - Pointer to data pointer. This pointer should be set to 
*                 a valid location. 
*   StartOfFile - If this flag is 1, the data pointer should be set to the 
*                 beginning of the data stream. 
* 
* Return value: 
*   Number of data bytes available. 
*/ 
static int _GetData(void * p, int NumBytesReq, const U8 ** ppData, unsigned StartOfFile) { 
  DWORD NumBytesRead; 
  HANDLE * phFile; 
  phFile = (HANDLE *)p; 
  if (StartOfFile) { 
    SetFilePointer(*phFile, 0, 0, FILE_BEGIN); 
  } 
  if (NumBytesReq > sizeof(_acBuffer)) { 
    NumBytesReq = sizeof(_acBuffer); 
  } 
  ReadFile(*phFile, _acBuffer, NumBytesReq, &NumBytesRead, NULL); 
  *ppData = _acBuffer; 
  return NumBytesRead; 
} 
 
/********************************************************************* 
* 
*       _DrawJPEG 
*/ 
static void _DrawJPEG(const char * sFilename) { 
  int XPos, YPos, XSize, YSize, nx, ny, n; 
  HANDLE hFile; 
  GUI_JPEG_INFO Info; 
  hFile = CreateFile(sFilename, GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0); 
  GUI_JPEG_GetInfoEx(_GetData, &hFile, &Info); 
  GUI_ClearRect(0, 60, 319, 239); 
  nx = 320000 / Info.XSize; 
  ny = 180000 / Info.YSize; 
  if (nx < ny) { 
    n = nx; 
  } else { 
    n = ny; 
  } 
  XSize = Info.XSize * n / 1000; 
  YSize = Info.YSize * n / 1000; 
  XPos = (320 - XSize) / 2; 
  YPos = (180 - YSize) / 2 + 60; 
  if (n > 1000) { 
    int temp=0; 
  } 
  GUI_JPEG_DrawScaledEx(_GetData, &hFile, XPos, YPos, n, 1000); 
  GUI_Delay(1000); 
  CloseHandle(hFile); 
} 
 
/******************************************************************* 
* 
*       _GetPath 
* 
* Returns the path from where the JPEGs should be searched 
*/ 
static void _GetPath(char * pPath, unsigned MaxSize) { 
  WM_HWIN hWin; 
  unsigned Len; 
  if (!strlen(pPath)) { 
    GetWindowsDirectory(pPath, MaxSize); 
    strcat(pPath, "\\Web\\Wallpaper\\"); 
  } 
  GUI_SetFont(&GUI_Font10_ASCII); 
  GUI_DispStringHCenterAt("Please enter the path from where the JPEGs should be searched:", 160, 60); 
  hWin = EDIT_Create(10, 80, 300, 20, 0, MaxSize, 0); 
  EDIT_SetText(hWin, pPath); 
  WM_SetFocus(hWin); 
  while (GUI_GetKey() != GUI_KEY_ENTER) { 
    GUI_Delay(100); 
  } 
  EDIT_GetText(hWin, pPath, MaxSize); 
  WM_DeleteWindow(hWin); 
  Len = strlen(pPath); 
  if (*(pPath + Len - 1) != '\\') { 
    if (Len < MaxSize) { 
      strcat(pPath, "\\"); 
    } 
  } 
  GUI_ClearRect(0, 60, 319, 239); 
} 
 
/******************************************************************* 
* 
*       _DrawJPEGS 
* 
* Iterates over all JPEG files of a directory 
*/ 
static void _DrawJPEGS(void) { 
  static char acPath[_MAX_PATH]; 
  char acMask[_MAX_PATH]; 
  char acFile[_MAX_PATH]; 
  WIN32_FIND_DATA Context; 
  HANDLE hFind; 
  GUI_SetBkColor(GUI_BLACK); 
  GUI_Clear(); 
  GUI_SetColor(GUI_WHITE); 
  GUI_SetFont(&GUI_Font24_ASCII); 
  GUI_DispStringHCenterAt("Drawing scaled JPEGs - Sample", 160, 5); 
  _GetPath(acPath, sizeof(acPath)); 
  GUI_SetFont(&GUI_Font8x16); 
  sprintf(acMask, "%s*.jp*", acPath); 
  hFind = FindFirstFile(acMask, &Context); 
  if (hFind != INVALID_HANDLE_VALUE) { 
    do { 
      sprintf(acFile, "%s%s", acPath, Context.cFileName); 
      GUI_DispStringAtCEOL(acFile, 5, 40); 
      _DrawJPEG(acFile); 
    } while (FindNextFile(hFind, &Context)); 
  } else { 
    GUI_DispStringHCenterAt("No JPEG files found!", 160, 60); 
    GUI_Delay(2000); 
  } 
} 
 
/********************************************************************* 
* 
*       Public code 
* 
********************************************************************** 
*/ 
/********************************************************************* 
* 
*       MainTask 
*/ 
void MainTask(void) { 
  GUI_Init(); 
  while(1) { 
    _DrawJPEGS(); 
  } 
} 
 
/*************************** End of file ****************************/