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

				BYTE reverse[256];
				BYTE *target = (BYTE *)malloc(cinfo.image_width);
				if (target == NULL) {
					throw FI_MSG_ERROR_MEMORY;
				}

				for(i = 0; i < 256; i++) {
					reverse[i] = (BYTE)(255 - i);
				}

				while(cinfo.next_scanline < cinfo.image_height) {
					BYTE *source = FreeImage_GetScanLine(dib, FreeImage_GetHeight(dib) - cinfo.next_scanline - 1);
					for(i = 0; i < cinfo.image_width; i++) {
						target[i] = reverse[ source[i] ];
					}
					jpeg_write_scanlines(&cinfo, &target, 1);
				}

				free(target);
			}

			// Step 8: Finish compression 

			jpeg_finish_compress(&cinfo);

			// Step 9: release JPEG compression object 

			jpeg_destroy_compress(&cinfo);

			return TRUE;

		} catch (const char *text) {
			if(text) {
				FreeImage_OutputMessageProc(s_format_id, text);
			}
			return FALSE;
		} 
	}

	return FALSE;
}

// ==========================================================
//   Init
// ==========================================================

void DLL_CALLCONV
InitJPEG(Plugin *plugin, int format_id) {
	s_format_id = format_id;

	plugin->format_proc = Format;
	plugin->description_proc = Description;
	plugin->extension_proc = Extension;
	plugin->regexpr_proc = RegExpr;
	plugin->open_proc = NULL;
	plugin->close_proc = NULL;
	plugin->pagecount_proc = NULL;
	plugin->pagecapability_proc = NULL;
	plugin->load_proc = Load;
	plugin->save_proc = Save;
	plugin->validate_proc = Validate;
	plugin->mime_proc = MimeType;
	plugin->supports_export_bpp_proc = SupportsExportDepth;
	plugin->supports_export_type_proc = SupportsExportType;
	plugin->supports_icc_profiles_proc = SupportsICCProfiles;
	plugin->supports_no_pixels_proc = SupportsNoPixels;
}