ALERROR rawConvertToDDB (int cxWidth, int cyHeight, RAWPIXEL *pRaw, DWORD dwFlags, HPALETTE hPalette, HBITMAP *rethBitmap)
// rawConvertToDDB
//
// Converts a raw image to a screen compatible bitmap
//
// cxWidth: The width of the raw image array in pixels
// cyHeight: The height of the raw image array in pixels
// pRaw: The actual array of raw image data. The image is a 2-dimensional
// array cxWidth by cyHeight pixels. Each pixel is a 32bit value.
// dwFlags: Unused
// hPalette: Current palette being used by the main window (may be NULL)
//
// rethBitmap: Returns a DDB compatible with the screen
{
ALERROR error;
HBITMAP hDIB;
// Start by converting to a DIB
if (error = rawConvertTo16bitDIB(cxWidth, cyHeight, pRaw, dwFlags, &hDIB))
return error;
// Now convert to a DDB
error = dibConvertToDDB(hDIB, hPalette, rethBitmap);
DeleteObject(hDIB);
if (error)
return error;
return NOERROR;
}
ALERROR JPEGLoadFromMemory (char *pImage, int iSize, DWORD dwFlags, HPALETTE hPalette, HBITMAP *rethBitmap)
// JPEGLoadFromMemory
//
// Load from a memory stream
{
ALERROR error;
IJLERR jerr;
// Initialize library
JPEG_CORE_PROPERTIES jcprops;
jerr = ijlInit(&jcprops);
if (jerr != IJL_OK)
return ERR_FAIL;
// Point to the buffer
jcprops.JPGFile = NULL;
jcprops.JPGBytes = (BYTE *)pImage;
jcprops.JPGSizeBytes = iSize;
// Read parameters
jerr = ijlRead(&jcprops, IJL_JBUFF_READPARAMS);
if (jerr != IJL_OK)
{
ijlFree(&jcprops);
return ERR_FAIL;
}
DWORD width = jcprops.JPGWidth;
DWORD height = jcprops.JPGHeight;
DWORD nchannels = 3; // 24-bits
DWORD dib_line_width = width * nchannels;
DWORD dib_pad_bytes = IJL_DIB_PAD_BYTES(width,nchannels);
// Allocate a dib
HBITMAP hBitmap;
BYTE *p24BitPixel;
if (error = dibCreate24bitDIB(width,
height,
0,
&hBitmap,
&p24BitPixel))
{
ijlFree(&jcprops);
return error;
}
// Setup the library to load into the dib format
jcprops.DIBWidth = width;
jcprops.DIBHeight = -(int)height;
jcprops.DIBChannels = nchannels;
jcprops.DIBColor = IJL_BGR;
jcprops.DIBPadBytes = dib_pad_bytes;
jcprops.DIBBytes = p24BitPixel;
// Setup the color space
switch (jcprops.JPGChannels)
{
case 1:
jcprops.JPGColor = IJL_G;
break;
case 3:
jcprops.JPGColor = IJL_YCBCR;
break;
default:
{
jcprops.DIBColor = (IJL_COLOR)IJL_OTHER;
jcprops.JPGColor = (IJL_COLOR)IJL_OTHER;
}
}
// Load the data in the buffer
jerr = ijlRead(&jcprops, IJL_JBUFF_READWHOLEIMAGE);
if (jerr != IJL_OK)
{
::DeleteObject(hBitmap);
ijlFree(&jcprops);
return ERR_FAIL;
}
// Done
ijlFree(&jcprops);
// If we want a DIB, just return that; otherwise,
// convert to DDB and return that
if (dwFlags & JPEG_LFR_DIB)
*rethBitmap = hBitmap;
else
{
HBITMAP hDDB;
error = dibConvertToDDB(hBitmap, hPalette, &hDDB);
::DeleteObject(hBitmap);
if (error)
return error;
*rethBitmap = hDDB;
}
return NOERROR;
}
