Function iLoadBitmapInternal

DevIL/src-IL/src/il_bmp.cpp:214–267

Internal function used to load the .bmp.

// Internal function used to load the .bmp.
ILboolean iLoadBitmapInternal()
{
	BMPHEAD		Header;
	OS2_HEAD	Os2Head;
	ILboolean	bBitmap;

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

	iGetBmpHead(&Header);
	if (!iCheckBmp(&Header)) {
		iseek(-(ILint)sizeof(BMPHEAD), IL_SEEK_CUR);
		iGetOS2Head(&Os2Head);
		if (!iCheckOS2(&Os2Head)) {
			ilSetError(IL_INVALID_FILE_HEADER);
			return IL_FALSE;
		}
		else {
			return iGetOS2Bmp(&Os2Head);
		}
	}

	// Don't know what to do if it has more than one plane...
	if (Header.biPlanes != 1) {
		ilSetError(IL_INVALID_FILE_HEADER);
		return IL_FALSE;
	}

	switch (Header.biCompression)
	{
		case 0:	// No compression
		case 3:	// BITFIELDS compression is handled in 16 bit
						// and 32 bit code in ilReadUncompBmp()
			bBitmap = ilReadUncompBmp(&Header);
			break;
		case 1:  //	RLE 8-bit / pixel (BI_RLE8)
			bBitmap = ilReadRLE8Bmp(&Header);
			break;
		case 2:  // RLE 4-bit / pixel (BI_RLE4)
			bBitmap = ilReadRLE4Bmp(&Header);
			break;

		default:
			ilSetError(IL_INVALID_FILE_HEADER);
			return IL_FALSE;
	}

	if (!ilFixImage())
		return IL_FALSE;

	return bBitmap;
}


// Reads an uncompressed .bmp