Esempio n. 1
0
/*******************************************************************
*
*       _ShowJPG
*
* Shows the contents of a JPEG file
*/
static void _ShowJPG(const char * sFilename) {
  int XSize, YSize, XPos, YPos;
  GUI_JPEG_INFO Info;
  DWORD NumBytesRead;
  HANDLE hFile = CreateFile(sFilename, GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
  DWORD FileSize = GetFileSize(hFile, NULL);
  char * pFile = malloc(FileSize);
  ReadFile(hFile, pFile, FileSize, &NumBytesRead, NULL);
  CloseHandle(hFile);
  GUI_ClearRect(0, 60, 319, 239);
  GUI_JPEG_GetInfo(pFile, FileSize, &Info);
  XSize = Info.XSize;
  YSize = Info.YSize;
  XPos = (XSize > 320) ?  0 : 160 - (XSize / 2);
  YPos = (YSize > 180) ? 60 : 150 - (YSize / 2);
  if (!GUI_JPEG_Draw(pFile, FileSize, XPos, YPos)) {
    GUI_Delay(2000);
  }
  free(pFile);
}
/*********************************************************************
*
*       _DrawJPEGs
*
* Function description
*   Draws the given JPEG image.
*/
static void _DrawJPEGs(const char * sFileName) {
  static int      i;
  const char      acError[] = "There is possibly not enough memory to display this JPEG image.\n\nPlease assign more memory to emWin in GUIConf.c.";
  GUI_JPEG_INFO   Info;
  GUI_RECT        Rect;
  HANDLE          hFile;
  DWORD           NumBytesRead;
  DWORD           FileSize;
  char          * pFile;
  int             xSize,  ySize;
  int             xPos,   yPos;
  int             r;

  xSize = LCD_GetXSize();
  ySize = LCD_GetYSize();
  //
  // Display file name.
  //
  Rect.x0 = BORDER_SIZE;
  Rect.y0 = TITLE_HEIGHT;
  Rect.x1 = xSize - BORDER_SIZE - 1;
  Rect.y1 = YPOS_IMAGE - 1;
  GUI_ClearRectEx(&Rect);
  GUI_SetTextMode(GUI_TM_NORMAL);
  GUI_SetFont(&GUI_Font8x16);
  GUI_DispStringInRectWrap(sFileName, &Rect, GUI_TA_HCENTER | GUI_TA_VCENTER, GUI_WRAPMODE_CHAR);
  //
  // Clear the area in which the JPEG files are displayed.
  //
  Rect.x0 = BORDER_SIZE;
  Rect.y0 = YPOS_IMAGE;
  Rect.x1 = xSize - BORDER_SIZE - 1;
  Rect.y1 = ySize - BORDER_SIZE - 1;
  GUI_ClearRectEx(&Rect);
  //
  // Load image.
  //
  hFile    = CreateFile(sFileName, GENERIC_READ, 0, 0, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
  FileSize = GetFileSize(hFile, NULL);
  pFile    = malloc(FileSize);
  ReadFile(hFile, pFile, FileSize, &NumBytesRead, NULL);
  CloseHandle(hFile);
  //
  // Check if the current JPEG image fits on the screen.
  //
  GUI_JPEG_GetInfo(pFile, FileSize, &Info);
  xSize -= BORDER_SIZE * 2 + 1;
  ySize -= YPOS_IMAGE + BORDER_SIZE + 1;
  //
  // Display the image centered.
  //
  xPos = BORDER_SIZE + (xSize - Info.XSize) / 2;
  yPos = YPOS_IMAGE  + (ySize - Info.YSize) / 2;
  GUI_SetClipRect(&Rect);
  r = GUI_JPEG_Draw(pFile, FileSize, xPos, yPos);
  GUI_SetClipRect(NULL);
  if (r) {
    //
    // The image could not be displayed successfully. Show an error message.
    //
    GUI_DispStringInRectWrap(acError, &Rect, GUI_TA_HCENTER | GUI_TA_VCENTER, GUI_WRAPMODE_WORD);
  } else {
    GUI_Delay(2000);
    if ((Info.XSize > xSize) || (Info.YSize > ySize)) {
      //
      // Inform the user about the possibility of scaling JPEG images.
      //
      if (i == 0) {
        GUI_ClearRectEx(&Rect);
        GUI_DispStringInRectWrap("JPEG images can be scaled as it is shown in 2DGL_JPEG_DrawScaled.c.",  &Rect, GUI_TA_BOTTOM | GUI_TA_HCENTER, GUI_WRAPMODE_WORD);
        GUI_Delay(3000);
      }
      i++;
      if (i == NUM_IMAGES_UNTIL_HINT) {
        i = 0;
      }
    }
  }
  free(pFile);
}