[scotty1024]

Version 7.

Centered pages.
Working zoom.
Less useless debug messages so its faster.

Code for iRex...

void XMgr::drawImage(SplashBitmap * bmp, 
                     int xSrc , int ySrc , 
                     int xDest, int yDest) 
{
    // Get our source image width and calculate delta frem screen width
    int srcWidth = bmp->getWidth();
    int deltaX = SCREEN_WIDTH - srcWidth;
    if (deltaX < 0) {
      // Source too wide, trim to screen width
      srcWidth = SCREEN_WIDTH;
    }

    // Get our source image height and calculate delta frem screen height
    int srcHeight = bmp->getHeight();
    int deltaY = CLIENT_AREA - (srcHeight + yDest);
    if (deltaY < 0) {
      // Source too tall, trim to screen height
      srcHeight = CLIENT_AREA - yDest;
    }

    // Get src image pointer from SplashBitmap
    char *src = (char*)bmp->getDataPtr();

    // Handle partial bitmap (zoom)
    if (xDest < 0) {
      // Outdent left margin
      src -= xDest;
    }
    if (yDest < 0) {
      // Skip down image
      src -= yDest * bmp->getWidth();;
    }

    // Point to screen memory buffer
    char *dest = screenMem;

    // Fill page header with white
    if (yDest > 0) {
      memset(dest, 0xf0, yDest * SCREEN_WIDTH);
      dest += yDest * SCREEN_WIDTH;
    }

    // Fill left margin
    if (xDest > 0) {
      memset(dest, 0xf0, xDest);
      dest += xDest;
    }

    // Copy rows from image to screen
    for (int i = 0; i < srcHeight; i++) {
      // Copy source line of data
      memcpy(dest, src, srcWidth);
      src += srcWidth;
      dest += srcWidth;

      // Fill right/left margin with white
      if (deltaX > 0) {
        memset(dest, 0xf0, deltaX);
        dest += deltaX;
      } else {
        // Skip extra source line material
        src -= deltaX;
      }
    }

    // Fill bottom of page with white
    if (deltaY > 0) {
      memset(dest, 0xf0, deltaY * SCREEN_WIDTH);
    }
}