Merge pull request #87 from glyptodon/webp-lossless
GUAC-1305: Support lossless WebP within encoder.
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commit
602285be35
@ -1340,7 +1340,7 @@ static void __guac_common_surface_flush_to_webp(guac_common_surface* surface) {
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/* Send WebP for rect */
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guac_client_stream_webp(surface->client, socket, GUAC_COMP_OVER, layer,
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surface->dirty_rect.x, surface->dirty_rect.y, rect,
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GUAC_SURFACE_WEBP_IMAGE_QUALITY);
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GUAC_SURFACE_WEBP_IMAGE_QUALITY, 0);
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cairo_surface_destroy(rect);
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surface->realized = 1;
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@ -425,7 +425,7 @@ void guac_client_stream_jpeg(guac_client* client, guac_socket* socket,
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void guac_client_stream_webp(guac_client* client, guac_socket* socket,
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guac_composite_mode mode, const guac_layer* layer, int x, int y,
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cairo_surface_t* surface, int quality) {
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cairo_surface_t* surface, int quality, int lossless) {
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#ifdef ENABLE_WEBP
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/* Allocate new stream for image */
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@ -435,7 +435,7 @@ void guac_client_stream_webp(guac_client* client, guac_socket* socket,
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guac_protocol_send_img(socket, stream, mode, layer, "image/webp", x, y);
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/* Write WebP data */
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guac_webp_write(socket, stream, surface, quality);
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guac_webp_write(socket, stream, surface, quality, lossless);
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/* Terminate stream */
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guac_protocol_send_end(socket, stream);
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@ -166,7 +166,7 @@ static int guac_webp_stream_write(const uint8_t* data, size_t data_size,
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}
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int guac_webp_write(guac_socket* socket, guac_stream* stream,
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cairo_surface_t* surface, int quality) {
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cairo_surface_t* surface, int quality, int lossless) {
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guac_webp_stream_writer writer;
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WebPPicture picture;
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@ -195,7 +195,7 @@ int guac_webp_write(guac_socket* socket, guac_stream* stream,
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return -1;
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/* Add additional tuning */
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config.lossless = 0;
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config.lossless = lossless;
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config.quality = quality;
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config.thread_level = 1; /* Multi threaded */
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config.method = 2; /* Compression method (0=fast/larger, 6=slow/smaller) */
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@ -44,12 +44,18 @@
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* The Cairo surface to write to the given stream and socket as PNG blobs.
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*
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* @param quality
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* The WebP image quality to use.
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* The WebP image quality to use. For lossy images, larger values indicate
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* improving quality at the expense of larger file size. For lossless
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* images, this dictates the quality of compression, with larger values
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* producing smaller files at the expense of speed.
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*
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* @param lossless
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* Zero for a lossy image, non-zero for lossless.
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*
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* @return
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* Zero if the encoding operation is successful, non-zero otherwise.
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*/
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int guac_webp_write(guac_socket* socket, guac_stream* stream,
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cairo_surface_t* surface, int quality);
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cairo_surface_t* surface, int quality, int lossless);
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#endif
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@ -737,12 +737,18 @@ void guac_client_stream_jpeg(guac_client* client, guac_socket* socket,
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* A Cairo surface containing the image data to be streamed.
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*
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* @param quality
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* The WebP image quality, which must be an integer value between 0 and
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* 100 inclusive.
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* The WebP image quality, which must be an integer value between 0 and 100
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* inclusive. For lossy images, larger values indicate improving quality at
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* the expense of larger file size. For lossless images, this dictates the
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* quality of compression, with larger values producing smaller files at
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* the expense of speed.
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*
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* @param lossless
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* Zero to encode a lossy image, non-zero to encode losslessly.
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*/
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void guac_client_stream_webp(guac_client* client, guac_socket* socket,
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guac_composite_mode mode, const guac_layer* layer, int x, int y,
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cairo_surface_t* surface, int quality);
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cairo_surface_t* surface, int quality, int lossless);
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/**
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* Returns whether the given client supports WebP. If the client does not
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