75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
/*
|
|
* 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;
|
|
|
|
}
|
|
|