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src/Source/FreeImage/Conversion32.cpp  view on Meta::CPAN

		target[FI_RGBA_ALPHA]	= 0xFF;
		target += 4;
	}
}

void DLL_CALLCONV
FreeImage_ConvertLine16To32_555(BYTE *target, BYTE *source, int width_in_pixels) {
	WORD *bits = (WORD *)source;

	for (int cols = 0; cols < width_in_pixels; cols++) {
		target[FI_RGBA_RED]   = (BYTE)((((bits[cols] & FI16_555_RED_MASK) >> FI16_555_RED_SHIFT) * 0xFF) / 0x1F);
		target[FI_RGBA_GREEN] = (BYTE)((((bits[cols] & FI16_555_GREEN_MASK) >> FI16_555_GREEN_SHIFT) * 0xFF) / 0x1F);
		target[FI_RGBA_BLUE]  = (BYTE)((((bits[cols] & FI16_555_BLUE_MASK) >> FI16_555_BLUE_SHIFT) * 0xFF) / 0x1F);
		target[FI_RGBA_ALPHA] = 0xFF;
		target += 4;
	}
}

void DLL_CALLCONV
FreeImage_ConvertLine16To32_565(BYTE *target, BYTE *source, int width_in_pixels) {
	WORD *bits = (WORD *)source;

	for (int cols = 0; cols < width_in_pixels; cols++) {
		target[FI_RGBA_RED]   = (BYTE)((((bits[cols] & FI16_565_RED_MASK) >> FI16_565_RED_SHIFT) * 0xFF) / 0x1F);
		target[FI_RGBA_GREEN] = (BYTE)((((bits[cols] & FI16_565_GREEN_MASK) >> FI16_565_GREEN_SHIFT) * 0xFF) / 0x3F);
		target[FI_RGBA_BLUE]  = (BYTE)((((bits[cols] & FI16_565_BLUE_MASK) >> FI16_565_BLUE_SHIFT) * 0xFF) / 0x1F);
		target[FI_RGBA_ALPHA] = 0xFF;
		target += 4;
	}
}
/*
void DLL_CALLCONV
FreeImage_ConvertLine24To32(BYTE *target, BYTE *source, int width_in_pixels) {
	for (int cols = 0; cols < width_in_pixels; cols++) {
		*(DWORD *)target = (*(DWORD *) source & FI_RGBA_RGB_MASK) | FI_RGBA_ALPHA_MASK;
		target += 4;
		source += 3;
	}
}
*/
/**
This unoptimized version of the conversion function avoid an undetermined bug with VC++ SP6. 
The bug occurs in release mode only, when the image height is equal to 537 
(try e.g. a size of 432x537 to reproduce the bug with the optimized function).
*/
void DLL_CALLCONV
FreeImage_ConvertLine24To32(BYTE *target, BYTE *source, int width_in_pixels) {
	for (int cols = 0; cols < width_in_pixels; cols++) {
		target[FI_RGBA_RED]   = source[FI_RGBA_RED];
		target[FI_RGBA_GREEN] = source[FI_RGBA_GREEN];
		target[FI_RGBA_BLUE]  = source[FI_RGBA_BLUE];
		target[FI_RGBA_ALPHA] = 0xFF;
		target += 4;
		source += 3;
	}
}

// ----------------------------------------------------------

inline void 
FreeImage_ConvertLine1To32MapTransparency(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette, BYTE *table, int transparent_pixels) {
	for (int cols = 0; cols < width_in_pixels; cols++) {
		int index = (source[cols>>3] & (0x80 >> (cols & 0x07))) != 0 ? 1 : 0;

		target[FI_RGBA_BLUE]	= palette[index].rgbBlue;
		target[FI_RGBA_GREEN]	= palette[index].rgbGreen;
		target[FI_RGBA_RED]		= palette[index].rgbRed;
		target[FI_RGBA_ALPHA] = (index < transparent_pixels) ? table[index] : 255;		
		target += 4;
	}	
}

inline void 
FreeImage_ConvertLine4To32MapTransparency(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette, BYTE *table, int transparent_pixels) {
	BOOL low_nibble = FALSE;
	int x = 0;

	for (int cols = 0 ; cols < width_in_pixels ; ++cols) {
		if (low_nibble) {
			target[FI_RGBA_BLUE]	= palette[LOWNIBBLE(source[x])].rgbBlue;
			target[FI_RGBA_GREEN]	= palette[LOWNIBBLE(source[x])].rgbGreen;
			target[FI_RGBA_RED]		= palette[LOWNIBBLE(source[x])].rgbRed;
			target[FI_RGBA_ALPHA]	= (LOWNIBBLE(source[x]) < transparent_pixels) ? table[LOWNIBBLE(source[x])] : 255;

			x++;
		} else {
			target[FI_RGBA_BLUE]	= palette[HINIBBLE(source[x]) >> 4].rgbBlue;
			target[FI_RGBA_GREEN]	= palette[HINIBBLE(source[x]) >> 4].rgbGreen;
			target[FI_RGBA_RED]		= palette[HINIBBLE(source[x]) >> 4].rgbRed;
			target[FI_RGBA_ALPHA]	= (HINIBBLE(source[x] >> 4) < transparent_pixels) ? table[HINIBBLE(source[x]) >> 4] : 255;
		}

		low_nibble = !low_nibble;
				
		target += 4;
	}
}

inline void 
FreeImage_ConvertLine8To32MapTransparency(BYTE *target, BYTE *source, int width_in_pixels, RGBQUAD *palette, BYTE *table, int transparent_pixels) {
	for (int cols = 0; cols < width_in_pixels; cols++) {
		target[FI_RGBA_BLUE]	= palette[source[cols]].rgbBlue;
		target[FI_RGBA_GREEN]	= palette[source[cols]].rgbGreen;
		target[FI_RGBA_RED]		= palette[source[cols]].rgbRed;
		target[FI_RGBA_ALPHA] = (source[cols] < transparent_pixels) ? table[source[cols]] : 255;
		target += 4;		
	}
}

// ----------------------------------------------------------

FIBITMAP * DLL_CALLCONV
FreeImage_ConvertTo32Bits(FIBITMAP *dib) {
	if(!FreeImage_HasPixels(dib)) return NULL;

	const int bpp = FreeImage_GetBPP(dib);
	const FREE_IMAGE_TYPE image_type = FreeImage_GetImageType(dib);
	
	if((image_type != FIT_BITMAP) && (image_type != FIT_RGB16) && (image_type != FIT_RGBA16)) {
		return NULL;
	}
	
	const int width = FreeImage_GetWidth(dib);
	const int height = FreeImage_GetHeight(dib);

	if(image_type == FIT_BITMAP) {

		if(bpp == 32) {
			return FreeImage_Clone(dib);
		}

		FIBITMAP *new_dib = FreeImage_Allocate(width, height, 32, FI_RGBA_RED_MASK, FI_RGBA_GREEN_MASK, FI_RGBA_BLUE_MASK);
		if(new_dib == NULL) {
			return NULL;
		}

		// copy metadata from src to dst
		FreeImage_CloneMetadata(new_dib, dib);

		BOOL bIsTransparent = FreeImage_IsTransparent(dib);

		switch(bpp) {
			case 1:
			{
				if(bIsTransparent) {
					for (int rows = 0; rows < height; rows++) {
						FreeImage_ConvertLine1To32MapTransparency(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib), FreeImage_GetTransparencyTable(dib), FreeImage_GetTransparencyCount(dib));
					}
				} else {
					for (int rows = 0; rows < height; rows++) {
						FreeImage_ConvertLine1To32(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib));
					}					
				}

				return new_dib;
			}

			case 4:
			{
				if(bIsTransparent) {
					for (int rows = 0; rows < height; rows++) {
						FreeImage_ConvertLine4To32MapTransparency(FreeImage_GetScanLine(new_dib, rows), FreeImage_GetScanLine(dib, rows), width, FreeImage_GetPalette(dib), FreeImage_GetTransparencyTable(dib), FreeImage_GetTransparencyCount(dib));
					}
				} else {
					for (int rows = 0; rows < height; rows++) {