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GUAC-236: Implement WebP decoding.

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This commit is contained in:
Michael Jumper 2016-02-28 16:43:25 -08:00
parent 960ee263e8
commit 21c568c0b4
1 changed files with 45 additions and 2 deletions
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45
src/guacenc/webp.c
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@ -21,14 +21,57 @@
*/
#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) {
/* STUB */
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;
}