Function LoadPixelData

Dependencies/FreeImage/Source/FreeImage/PluginBMP.cpp:150–196

Load uncompressed image pixels for 1-, 4-, 8-, 16-, 24- and 32-bit dib @param io FreeImage IO @param handle FreeImage IO handle @param dib Image to be loaded @param height Image height @param pitch Image pitch @param bit_count Image bit-depth (1-, 4-, 8-, 16-, 24- or 32-bit) @return Returns TRUE if successful, returns FALSE otherwise */

@return Returns TRUE if successful, returns FALSE otherwise
*/
static BOOL 
LoadPixelData(FreeImageIO *io, fi_handle handle, FIBITMAP *dib, int height, unsigned pitch, unsigned bit_count) {
	unsigned count = 0;

	// Load pixel data
	// NB: height can be < 0 for BMP data
	if (height > 0) {
		count = io->read_proc((void *)FreeImage_GetBits(dib), height * pitch, 1, handle);
		if(count != 1) {
			return FALSE;
		}
	} else {
		int positiveHeight = abs(height);
		for (int c = 0; c < positiveHeight; ++c) {
			count = io->read_proc((void *)FreeImage_GetScanLine(dib, positiveHeight - c - 1), pitch, 1, handle);
			if(count != 1) {
				return FALSE;
			}
		}
	}

	// swap as needed
#ifdef FREEIMAGE_BIGENDIAN
	if (bit_count == 16) {
		for(unsigned y = 0; y < FreeImage_GetHeight(dib); y++) {
			WORD *pixel = (WORD *)FreeImage_GetScanLine(dib, y);
			for(unsigned x = 0; x < FreeImage_GetWidth(dib); x++) {
				SwapShort(pixel);
				pixel++;
			}
		}
	}
#endif
#if FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_RGB
	if (bit_count == 24 || bit_count == 32) {
		for(unsigned y = 0; y < FreeImage_GetHeight(dib); y++) {
			BYTE *pixel = FreeImage_GetScanLine(dib, y);
			for(unsigned x = 0; x < FreeImage_GetWidth(dib); x++) {
				INPLACESWAP(pixel[0], pixel[2]);
				pixel += (bit_count >> 3);
			}
		}
	}
#endif

	return TRUE;
}

/**
Load image pixels for 4-bit RLE compressed dib