Function iSaveBitmapInternal

DevIL/src-IL/src/il_bmp.cpp:897–1045

Internal function used to save the .bmp.

// Internal function used to save the .bmp.
ILboolean iSaveBitmapInternal()
{
	//int compress_rle8 = ilGetInteger(IL_BMP_RLE);
	int compress_rle8 = IL_FALSE; // disabled BMP RLE compression. broken
	ILuint	FileSize, i, PadSize, Padding = 0;
	ILimage	*TempImage = NULL;
	ILpal	*TempPal;
	ILubyte	*TempData;

	if (iCurImage == NULL) {
		ilSetError(IL_ILLEGAL_OPERATION);
		return IL_FALSE;
	}

	iputc('B');  // Comprises the
	iputc('M');  //  "signature"
	
	SaveLittleUInt(0);  // Will come back and change later in this function (filesize)
	SaveLittleUInt(0);  // Reserved

	if (compress_rle8 == IL_TRUE)
	{
		TempImage = iConvertImage(iCurImage, IL_COLOR_INDEX, IL_UNSIGNED_BYTE);
		if (TempImage == NULL)
			return IL_FALSE;
		TempPal = iConvertPal(&TempImage->Pal, IL_PAL_BGR32);
		if (TempPal == NULL)
		{
			ilCloseImage(TempImage);
			return IL_FALSE;
		}
	}

	// If the current image has a palette, take care of it
	TempPal = &iCurImage->Pal;
	if( iCurImage->Pal.PalSize && iCurImage->Pal.Palette && iCurImage->Pal.PalType != IL_PAL_NONE ) {
		// If the palette in .bmp format, write it directly
		if (iCurImage->Pal.PalType == IL_PAL_BGR32) {
			TempPal = &iCurImage->Pal;
		} else {
			TempPal = iConvertPal(&iCurImage->Pal, IL_PAL_BGR32);
			if (TempPal == NULL) {
				return IL_FALSE;
			}
		}
	}

	SaveLittleUInt(54 + TempPal->PalSize);  // Offset of the data
	
	//Changed 20040923: moved this block above writing of
	//BITMAPINFOHEADER, so that the written header refers to
	//TempImage instead of the original image
	
	// @TODO LUMINANCE converted to BGR insteaf of beign saved to luminance
	if (iCurImage->Format != IL_BGR && iCurImage->Format != IL_BGRA && iCurImage->Format != IL_COLOUR_INDEX) {
		if (iCurImage->Format == IL_RGBA) {
			TempImage = iConvertImage(iCurImage, IL_BGRA, IL_UNSIGNED_BYTE);
		} else {