GUAC-236: Implement WebP decoding.
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@ -21,14 +21,57 @@
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*/
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#include "config.h"
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#include "log.h"
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#include "webp.h"
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#include <cairo/cairo.h>
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#include <guacamole/client.h>
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#include <webp/decode.h>
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#include <stdint.h>
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#include <stdlib.h>
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cairo_surface_t* guacenc_webp_decoder(unsigned char* data, int length) {
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/* STUB */
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int width, height;
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/* Validate WebP and pull dimensions */
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if (!WebPGetInfo((uint8_t*) data, length, &width, &height)) {
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guacenc_log(GUAC_LOG_WARNING, "Invalid WebP data");
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return NULL;
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}
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/* Create blank Cairo surface */
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cairo_surface_t* surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
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width, height);
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/* Fill surface with opaque black */
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cairo_t* cairo = cairo_create(surface);
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cairo_set_operator(cairo, CAIRO_OPERATOR_SOURCE);
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cairo_set_source_rgba(cairo, 0.0, 0.0, 0.0, 1.0);
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cairo_paint(cairo);
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cairo_destroy(cairo);
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/* Finish any pending draws */
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cairo_surface_flush(surface);
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/* Pull underlying buffer and its stride */
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int stride = cairo_image_surface_get_stride(surface);
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unsigned char* image = cairo_image_surface_get_data(surface);
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/* Read WebP into surface */
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uint8_t* result = WebPDecodeBGRAInto((uint8_t*) data, length,
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(uint8_t*) image, stride * height, stride);
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/* Verify WebP was successfully decoded */
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if (result == NULL) {
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guacenc_log(GUAC_LOG_WARNING, "Invalid WebP data");
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cairo_surface_destroy(surface);
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return NULL;
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}
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/* WebP was read successfully */
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return surface;
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}
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