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

	} catch(int) {
		WebPDataClear(&webp_frame.bitstream);
		return NULL;
	}
}

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

/**
Encode a FIBITMAP to a WebP image
@param hmem Memory output stream, containing on return the encoded image
@param dib The FIBITMAP to encode
@param flags FreeImage save flags
@return Returns TRUE if successfull, returns FALSE otherwise
*/
static BOOL
EncodeImage(FIMEMORY *hmem, FIBITMAP *dib, int flags) {
	WebPPicture picture;	// Input buffer
	WebPConfig config;		// Coding parameters

	BOOL bIsFlipped = FALSE;

	try {
		const unsigned width = FreeImage_GetWidth(dib);
		const unsigned height = FreeImage_GetHeight(dib);
		const unsigned bpp = FreeImage_GetBPP(dib);
		const unsigned pitch = FreeImage_GetPitch(dib);

		// check image type
		FREE_IMAGE_TYPE image_type = FreeImage_GetImageType(dib);

		if( !((image_type == FIT_BITMAP) && ((bpp == 24) || (bpp == 32))) )  {
			throw FI_MSG_ERROR_UNSUPPORTED_FORMAT;
		}

		// check format limits
		if(MAX(width, height) > WEBP_MAX_DIMENSION) {
			FreeImage_OutputMessageProc(s_format_id, "Unsupported image size: width x height = %d x %d", width, height);
			return FALSE;
		}

		// Initialize output I/O
		if(WebPPictureInit(&picture) == 1) {
			picture.writer = WebP_MemoryWriter;
			picture.custom_ptr = hmem;
			picture.width = (int)width;
			picture.height = (int)height;
		} else {
			throw "Couldn't initialize WebPPicture";
		}

		// --- Set encoding parameters ---

		// Initialize encoding parameters to default values
		WebPConfigInit(&config);

		// quality/speed trade-off (0=fast, 6=slower-better)
		config.method = 6;

		if((flags & WEBP_LOSSLESS) == WEBP_LOSSLESS) {
			// lossless encoding
			config.lossless = 1;
			picture.use_argb = 1;
		} else if((flags & 0x7F) > 0) {
			// lossy encoding
			config.lossless = 0;
			// quality is between 1 (smallest file) and 100 (biggest) - default to 75
			config.quality = (float)(flags & 0x7F);
			if(config.quality > 100) {
				config.quality = 100;
			}
		}

		// validate encoding parameters
		if(WebPValidateConfig(&config) == 0) {
			throw "Failed to initialize encoder";
		}

		// --- Perform encoding ---
		
		// Invert dib scanlines
		bIsFlipped = FreeImage_FlipVertical(dib);


		// convert dib buffer to output stream

		const BYTE *bits = FreeImage_GetBits(dib);

#if FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_BGR
		switch(bpp) {
			case 24:
				WebPPictureImportBGR(&picture, bits, pitch);
				break;
			case 32:
				WebPPictureImportBGRA(&picture, bits, pitch);
				break;
		}
#else
		switch(bpp) {
			case 24:
				WebPPictureImportRGB(&picture, bits, pitch);
				break;
			case 32:
				WebPPictureImportRGBA(&picture, bits, pitch);
				break;
		}

#endif // FREEIMAGE_COLORORDER == FREEIMAGE_COLORORDER_BGR

		if(!WebPEncode(&config, &picture)) {
			throw "Failed to encode image";
		}

		WebPPictureFree(&picture);

		if(bIsFlipped) {
			// invert dib scanlines
			FreeImage_FlipVertical(dib);
		}

		return TRUE;

	} catch (const char* text) {

		WebPPictureFree(&picture);