| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #include "config.h" |
| #include "log.h" |
| #include "webp.h" |
| |
| #include <cairo/cairo.h> |
| #include <guacamole/client.h> |
| #include <webp/decode.h> |
| |
| #include <stdint.h> |
| #include <stdlib.h> |
| |
| cairo_surface_t* guacenc_webp_decoder(unsigned char* data, int length) { |
| |
| int width, height; |
| |
| /* Validate WebP and pull dimensions */ |
| if (!WebPGetInfo((uint8_t*) data, length, &width, &height)) { |
| guacenc_log(GUAC_LOG_WARNING, "Invalid WebP data"); |
| return NULL; |
| } |
| |
| /* Create blank Cairo surface */ |
| cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, |
| width, height); |
| |
| /* Fill surface with opaque black */ |
| cairo_t* cairo = cairo_create(surface); |
| cairo_set_operator(cairo, CAIRO_OPERATOR_SOURCE); |
| cairo_set_source_rgba(cairo, 0.0, 0.0, 0.0, 1.0); |
| cairo_paint(cairo); |
| cairo_destroy(cairo); |
| |
| /* Finish any pending draws */ |
| cairo_surface_flush(surface); |
| |
| /* Pull underlying buffer and its stride */ |
| int stride = cairo_image_surface_get_stride(surface); |
| unsigned char* image = cairo_image_surface_get_data(surface); |
| |
| /* Read WebP into surface */ |
| uint8_t* result = WebPDecodeBGRAInto((uint8_t*) data, length, |
| (uint8_t*) image, stride * height, stride); |
| |
| /* Verify WebP was successfully decoded */ |
| if (result == NULL) { |
| guacenc_log(GUAC_LOG_WARNING, "Invalid WebP data"); |
| cairo_surface_destroy(surface); |
| return NULL; |
| } |
| |
| /* WebP was read successfully */ |
| return surface; |
| |
| } |
| |