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

							if(hPngMemory == NULL) {
								hPngMemory = FreeImage_OpenMemory();
							}
							mng_WritePNGStream(jng_width, jng_height, jng_alpha_sample_depth, data, size_in_bytes, hPngMemory);
							// load the PNG
							if(dib_alpha) {
								FreeImage_Unload(dib_alpha);
							}
							dib_alpha = mng_LoadFromMemoryHandle(hPngMemory, flags);
						}
					}
					// stop the parsing
					mEnd = TRUE;
					break;

				case JDAA:
					break;

				case gAMA:
					break;

				case pHYs:
					// unit is pixels per meter
					memcpy(&res_x, &mChunk[0], 4);
					mng_SwapLong(&res_x);
					memcpy(&res_y, &mChunk[4], 4);
					mng_SwapLong(&res_y);
					break;

				case bKGD:
					memcpy(&bk_red, &mChunk[0], 2);
					mng_SwapShort(&bk_red);
					rgbBkColor.rgbRed = (BYTE)bk_red;
					memcpy(&bk_green, &mChunk[2], 2);
					mng_SwapShort(&bk_green);
					rgbBkColor.rgbGreen = (BYTE)bk_green;
					memcpy(&bk_blue, &mChunk[4], 2);
					mng_SwapShort(&bk_blue);
					rgbBkColor.rgbBlue = (BYTE)bk_blue;
					hasBkColor = TRUE;
					break;
				
				case tEXt:
					mng_SetMetadata_tEXt(key_value_pair, mChunk, mLength);
					break;

				case UNKNOWN_CHUNCK:
				default:
					break;


			} // switch( GetChunckType )
		} // while(!mEnd)

		FreeImage_CloseMemory(hJpegMemory);
		FreeImage_CloseMemory(hPngMemory);
		FreeImage_CloseMemory(hIDATMemory);
		free(mChunk);
		free(PLTE_file_chunk);

		// convert to 32-bit if a transparent layer is available
		if(!header_only && dib_alpha) {
			FIBITMAP *dst = FreeImage_ConvertTo32Bits(dib);
			if((FreeImage_GetBPP(dib_alpha) == 8) && (FreeImage_GetImageType(dib_alpha) == FIT_BITMAP)) {
				FreeImage_SetChannel(dst, dib_alpha, FICC_ALPHA);
			} else {
				FIBITMAP *dst_alpha = FreeImage_ConvertTo8Bits(dib_alpha);
				FreeImage_SetChannel(dst, dst_alpha, FICC_ALPHA);
				FreeImage_Unload(dst_alpha);
			}			
			FreeImage_Unload(dib);
			dib = dst;
		}
		FreeImage_Unload(dib_alpha);

		if(dib) {
			// set metadata
			FreeImage_SetDotsPerMeterX(dib, res_x);
			FreeImage_SetDotsPerMeterY(dib, res_y);
			if(hasBkColor) {
				FreeImage_SetBackgroundColor(dib, &rgbBkColor);
			}
			if(key_value_pair.size()) {
				for(tEXtMAP::iterator j = key_value_pair.begin(); j != key_value_pair.end(); j++) {
					std::string key = (*j).first;
					std::string value = (*j).second;
					mng_SetKeyValue(FIMD_COMMENTS, dib, key.c_str(), value.c_str());
				}
			}
		}
			
		return dib;

	} catch(const char *text) {
		FreeImage_CloseMemory(hJpegMemory);
		FreeImage_CloseMemory(hPngMemory);
		FreeImage_CloseMemory(hIDATMemory);
		free(mChunk);
		free(PLTE_file_chunk);
		FreeImage_Unload(dib);
		FreeImage_Unload(dib_alpha);
		if(text) {
			FreeImage_OutputMessageProc(format_id, text);
		}
		return NULL;
	}
}

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

/**
Write a FIBITMAP to a JNG stream
@param format_id ID of the caller
@param io Stream i/o functions
@param dib Image to be saved
@param handle Stream handle
@param flags Saving flags
@return Returns TRUE if successful, returns FALSE otherwise
*/
BOOL 
mng_WriteJNG(int format_id, FreeImageIO *io, FIBITMAP *dib, fi_handle handle, int flags) {