C++ LLImageJ2C::copyData方法代码示例

//.........这里部分代码省略.........
	{
		parameters.cp_comment = (char *) "";
	}
	else
	{
		// Awful hacky cast, too lazy to copy right now.
		parameters.cp_comment = (char *) comment_text;
	}

	//
	// Fill in the source image from our raw image
	//
	OPJ_COLOR_SPACE color_space = CLRSPC_SRGB;
	opj_image_cmptparm_t cmptparm[MAX_COMPS];
	opj_image_t * image = NULL;
	S32 numcomps = raw_image.getComponents();
	S32 width = raw_image.getWidth();
	S32 height = raw_image.getHeight();

	memset(&cmptparm[0], 0, MAX_COMPS * sizeof(opj_image_cmptparm_t));
	for(S32 c = 0; c < numcomps; c++) {
		cmptparm[c].prec = 8;
		cmptparm[c].bpp = 8;
		cmptparm[c].sgnd = 0;
		cmptparm[c].dx = parameters.subsampling_dx;
		cmptparm[c].dy = parameters.subsampling_dy;
		cmptparm[c].w = width;
		cmptparm[c].h = height;
	}

	/* create the image */
	image = opj_image_create(numcomps, &cmptparm[0], color_space);

	image->x1 = width;
	image->y1 = height;

	S32 i = 0;
	const U8 *src_datap = raw_image.getData();
	for (S32 y = height - 1; y >= 0; y--)
	{
		for (S32 x = 0; x < width; x++)
		{
			const U8 *pixel = src_datap + (y*width + x) * numcomps;
			for (S32 c = 0; c < numcomps; c++)
			{
				image->comps[c].data[i] = *pixel;
				pixel++;
			}
			i++;
		}
	}



	/* encode the destination image */
	/* ---------------------------- */

	int codestream_length;
	opj_cio_t *cio = NULL;

	/* get a J2K compressor handle */
	opj_cinfo_t* cinfo = opj_create_compress(CODEC_J2K);

	/* catch events using our callbacks and give a local context */
	opj_set_event_mgr((opj_common_ptr)cinfo, &event_mgr, stderr);			

	/* setup the encoder parameters using the current image and using user parameters */
	opj_setup_encoder(cinfo, &parameters, image);

	/* open a byte stream for writing */
	/* allocate memory for all tiles */
	cio = opj_cio_open((opj_common_ptr)cinfo, NULL, 0);

	/* encode the image */
	bool bSuccess = opj_encode(cinfo, cio, image, NULL);
	if (!bSuccess)
	{
		opj_cio_close(cio);
		LL_DEBUGS("Texture") << "Failed to encode image." << LL_ENDL;
		return FALSE;
	}
	codestream_length = cio_tell(cio);

	base.copyData(cio->buffer, codestream_length);
	base.updateData(); // set width, height

	/* close and free the byte stream */
	opj_cio_close(cio);

	/* free remaining compression structures */
	opj_destroy_compress(cinfo);


	/* free user parameters structure */
	if(parameters.cp_matrice) free(parameters.cp_matrice);

	/* free image data */
	opj_image_destroy(image);
	return TRUE;
}

//.........这里部分代码省略.........
		}
		// Note: for small images, we can have (max_bytes < FIRST_PACKET_SIZE), hence the test
		if (layer_bytes[nb_layers-1] < max_bytes)
		{
			// Set the last quality layer so to fit the preset compression ratio
			layer_bytes[nb_layers++] = max_bytes;
		}

		if (reversible)
		{
			// Use 0 for a last quality layer for reversible images so all remaining code blocks will be flushed
			// Hack: KDU encoding for reversible images has a bug for small images that leads to j2c images that 
			// cannot be open or are very blurry. Avoiding that last layer prevents the problem to happen.
			if ((base.getWidth() >= 32) || (base.getHeight() >= 32))
			{
				layer_bytes[nb_layers++] = 0;
			}
			codestream.access_siz()->parse_string("Creversible=yes");
			// *TODO: we should use yuv in reversible mode
			// Don't turn this on now though as it creates problems on decoding for the moment
			//codestream.access_siz()->parse_string("Cycc=no");
		}
		
		std::string layer_string = llformat("Clayers=%d",nb_layers);
		codestream.access_siz()->parse_string(layer_string.c_str());
		
		// Set up data ordering, markers, etc... if precincts or blocks specified
		if ((mBlocksSize != -1) || (mPrecinctsSize != -1))
		{
			if (mPrecinctsSize != -1)
			{
				std::string precincts_string = llformat("Cprecincts={%d,%d}",mPrecinctsSize,mPrecinctsSize);
				codestream.access_siz()->parse_string(precincts_string.c_str());
			}
			if (mBlocksSize != -1)
			{
				std::string blocks_string = llformat("Cblk={%d,%d}",mBlocksSize,mBlocksSize);
				codestream.access_siz()->parse_string(blocks_string.c_str());
			}
			std::string ordering_string = llformat("Corder=LRCP");
			codestream.access_siz()->parse_string(ordering_string.c_str());
			std::string PLT_string = llformat("ORGgen_plt=yes");
			codestream.access_siz()->parse_string(PLT_string.c_str());
			std::string Parts_string = llformat("ORGtparts=R");
			codestream.access_siz()->parse_string(Parts_string.c_str());
		}
		
		// Set the number of wavelets subresolutions (aka levels) 
		if (mLevels != 0)
		{
			std::string levels_string = llformat("Clevels=%d",mLevels);
			codestream.access_siz()->parse_string(levels_string.c_str());
		}
		
		// Complete the encode settings
		codestream.access_siz()->finalize_all();
		codestream.change_appearance(transpose,vflip,hflip);

		// Now we are ready for sample data processing
		kdc_flow_control *tile = new kdc_flow_control(&mem_in,codestream);
		bool done = false;
		while (!done)
		{ 
			// Process line by line
			if (tile->advance_components())
			{
				tile->process_components();
			}
			else
			{
				done = true;
			}
		}

		// Produce the compressed output
		codestream.flush(layer_bytes,nb_layers);

		// Cleanup
		delete tile;
		codestream.destroy();

		// Now that we're done encoding, create the new data buffer for the compressed
		// image and stick it there.
		base.copyData(output_buffer, output_size);
		base.updateData(); // set width, height
		delete[] output_buffer;
	}
	catch(const char* msg)
	{
		base.setLastError(ll_safe_string(msg));
		return FALSE;
	}
	catch( ... )
	{
		base.setLastError( "Unknown J2C error" );
		return FALSE;
	}

	return TRUE;
}

//.........这里部分代码省略.........
		comment_metadata=llformat("a=%s&%s&h=%u&w=%u",gAgentID.asString().c_str(),timestr.c_str(),(U32)raw_image.getHeight(),(U32)raw_image.getWidth());
		parameters.cp_comment = (char *) comment_metadata.c_str();
	}
	else
	{
		// Awful hacky cast, too lazy to copy right now.
		parameters.cp_comment = (char *) comment_text;
	}

	//
	// Fill in the source image from our raw image
	//
	OPJ_COLOR_SPACE color_space = CLRSPC_SRGB;
	opj_image_cmptparm_t cmptparm[MAX_COMPS];
	opj_image_t * image = NULL;
	S32 numcomps = llmin((S32)raw_image.getComponents(),(S32)MAX_COMPS); //Clamp avoid overrunning buffer -Shyotl
	S32 width = raw_image.getWidth();
	S32 height = raw_image.getHeight();

	memset(&cmptparm[0], 0, MAX_COMPS * sizeof(opj_image_cmptparm_t));
	for(S32 c = 0; c < numcomps; c++) {
		cmptparm[c].prec = 8;
		cmptparm[c].bpp = 8;
		cmptparm[c].sgnd = 0;
		cmptparm[c].dx = parameters.subsampling_dx;
		cmptparm[c].dy = parameters.subsampling_dy;
		cmptparm[c].w = width;
		cmptparm[c].h = height;
	}

	/* create the image */
	image = opj_image_create(numcomps, &cmptparm[0], color_space);

	image->x1 = width;
	image->y1 = height;

	S32 i = 0;
	const U8 *src_datap = raw_image.getData();
	for (S32 y = height - 1; y >= 0; y--)
	{
		for (S32 x = 0; x < width; x++)
		{
			const U8 *pixel = src_datap + (y*width + x) * numcomps;
			for (S32 c = 0; c < numcomps; c++)
			{
				image->comps[c].data[i] = *pixel;
				pixel++;
			}
			i++;
		}
	}



	/* encode the destination image */
	/* ---------------------------- */

	int codestream_length;
	opj_cio_t *cio = NULL;

	/* get a J2K compressor handle */
	opj_cinfo_t* cinfo = opj_create_compress(CODEC_J2K);

	/* catch events using our callbacks and give a local context */
	opj_set_event_mgr((opj_common_ptr)cinfo, &event_mgr, stderr);			

	/* setup the encoder parameters using the current image and using user parameters */
	opj_setup_encoder(cinfo, &parameters, image);

	/* open a byte stream for writing */
	/* allocate memory for all tiles */
	cio = opj_cio_open((opj_common_ptr)cinfo, NULL, 0);

	/* encode the image */
	bool bSuccess = opj_encode(cinfo, cio, image, NULL);
	if (!bSuccess)
	{
		opj_cio_close(cio);
		llinfos << "Failed to encode image." << llendl;
		return FALSE;
	}
	codestream_length = cio_tell(cio);

	base.copyData(cio->buffer, codestream_length);
	base.updateData(); // set width, height

	/* close and free the byte stream */
	opj_cio_close(cio);

	/* free remaining compression structures */
	opj_destroy_compress(cinfo);


	/* free user parameters structure */
	if(parameters.cp_matrice) free(parameters.cp_matrice);

	/* free image data */
	opj_image_destroy(image);
	return TRUE;
}