2010 lines
60 KiB
C
2010 lines
60 KiB
C
/*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*/
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#include "config.h"
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#include "common/rect.h"
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#include "common/surface.h"
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#include <cairo/cairo.h>
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#include <guacamole/client.h>
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#include <guacamole/layer.h>
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#include <guacamole/protocol.h>
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#include <guacamole/socket.h>
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#include <guacamole/timestamp.h>
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#include <guacamole/user.h>
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#include <pthread.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <string.h>
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/**
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* The width of an update which should be considered negible and thus
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* trivial overhead compared ot the cost of two updates.
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*/
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#define GUAC_SURFACE_NEGLIGIBLE_WIDTH 64
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/**
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* The height of an update which should be considered negible and thus
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* trivial overhead compared ot the cost of two updates.
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*/
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#define GUAC_SURFACE_NEGLIGIBLE_HEIGHT 64
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/**
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* The proportional increase in cost contributed by transfer and processing of
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* image data, compared to processing an equivalent amount of client-side
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* data.
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*/
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#define GUAC_SURFACE_DATA_FACTOR 16
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/**
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* The base cost of every update. Each update should be considered to have
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* this starting cost, plus any additional cost estimated from its
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* content.
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*/
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#define GUAC_SURFACE_BASE_COST 4096
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/**
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* An increase in cost is negligible if it is less than
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* 1/GUAC_SURFACE_NEGLIGIBLE_INCREASE of the old cost.
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*/
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#define GUAC_SURFACE_NEGLIGIBLE_INCREASE 4
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/**
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* If combining an update because it appears to be follow a fill pattern,
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* the combined cost must not exceed
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* GUAC_SURFACE_FILL_PATTERN_FACTOR * (total uncombined cost).
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*/
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#define GUAC_SURFACE_FILL_PATTERN_FACTOR 3
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/* Define cairo_format_stride_for_width() if missing */
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#ifndef HAVE_CAIRO_FORMAT_STRIDE_FOR_WIDTH
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#define cairo_format_stride_for_width(format, width) (width*4)
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#endif
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/**
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* The framerate which, if exceeded, indicates that JPEG is preferred.
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*/
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#define GUAC_COMMON_SURFACE_JPEG_FRAMERATE 3
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/**
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* Minimum JPEG bitmap size (area). If the bitmap is smaller than this threshold,
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* it should be compressed as a PNG image to avoid the JPEG compression tax.
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*/
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#define GUAC_SURFACE_JPEG_MIN_BITMAP_SIZE 4096
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/**
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* The JPEG compression min block size. This defines the optimal rectangle block
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* size factor for JPEG compression. Usually 8x8 would suffice, but use 16 to
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* reduce the occurrence of ringing artifacts further.
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*/
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#define GUAC_SURFACE_JPEG_BLOCK_SIZE 16
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/**
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* The WebP compression min block size. This defines the optimal rectangle block
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* size factor for WebP compression. WebP does utilize variable block size, but
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* ensuring a block size factor reduces any noise on the image edges.
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*/
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#define GUAC_SURFACE_WEBP_BLOCK_SIZE 8
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void guac_common_surface_move(guac_common_surface* surface, int x, int y) {
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pthread_mutex_lock(&surface->_lock);
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surface->x = x;
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surface->y = y;
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surface->location_dirty = 1;
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pthread_mutex_unlock(&surface->_lock);
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}
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void guac_common_surface_stack(guac_common_surface* surface, int z) {
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pthread_mutex_lock(&surface->_lock);
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surface->z = z;
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surface->location_dirty = 1;
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pthread_mutex_unlock(&surface->_lock);
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}
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void guac_common_surface_set_parent(guac_common_surface* surface,
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const guac_layer* parent) {
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pthread_mutex_lock(&surface->_lock);
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surface->parent = parent;
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surface->location_dirty = 1;
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pthread_mutex_unlock(&surface->_lock);
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}
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void guac_common_surface_set_opacity(guac_common_surface* surface,
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int opacity) {
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pthread_mutex_lock(&surface->_lock);
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surface->opacity = opacity;
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surface->opacity_dirty = 1;
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pthread_mutex_unlock(&surface->_lock);
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}
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/**
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* Updates the coordinates of the given rectangle to be within the bounds of
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* the given surface.
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*
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* @param surface The surface to use for clipping.
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* @param rect The rectangle to clip.
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* @param sx The X coordinate of the source rectangle, if any.
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* @param sy The Y coordinate of the source rectangle, if any.
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*/
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static void __guac_common_bound_rect(guac_common_surface* surface,
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guac_common_rect* rect, int* sx, int* sy) {
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guac_common_rect bounds_rect = {
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.x = 0,
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.y = 0,
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.width = surface->width,
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.height = surface->height
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};
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int orig_x = rect->x;
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int orig_y = rect->y;
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guac_common_rect_constrain(rect, &bounds_rect);
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/* Update source X/Y if given */
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if (sx != NULL) *sx += rect->x - orig_x;
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if (sy != NULL) *sy += rect->y - orig_y;
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}
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/**
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* Updates the coordinates of the given rectangle to be within the clipping
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* rectangle of the given surface, which must always be within the bounding
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* rectangle of the given surface.
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*
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* @param surface The surface to use for clipping.
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* @param rect The rectangle to clip.
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* @param sx The X coordinate of the source rectangle, if any.
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* @param sy The Y coordinate of the source rectangle, if any.
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*/
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static void __guac_common_clip_rect(guac_common_surface* surface,
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guac_common_rect* rect, int* sx, int* sy) {
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int orig_x = rect->x;
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int orig_y = rect->y;
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/* Just bound within surface if no clipping rectangle applied */
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if (!surface->clipped) {
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__guac_common_bound_rect(surface, rect, sx, sy);
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return;
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}
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guac_common_rect_constrain(rect, &surface->clip_rect);
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/* Update source X/Y if given */
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if (sx != NULL) *sx += rect->x - orig_x;
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if (sy != NULL) *sy += rect->y - orig_y;
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}
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/**
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* Returns whether a rectangle within the given surface contains only fully
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* opaque pixels.
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*
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* @param surface
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* The surface to check.
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*
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* @param rect
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* The rectangle to check.
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*
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* @return
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* Non-zero if the rectangle contains only fully opaque pixels, zero
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* otherwise.
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*/
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static int __guac_common_surface_is_opaque(guac_common_surface* surface,
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guac_common_rect* rect) {
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int x, y;
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int stride = surface ->stride;
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unsigned char* buffer =
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surface->buffer + (stride * rect->y) + (4 * rect->x);
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/* For each row */
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for (y = 0; y < rect->height; y++) {
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/* Search for a non-opaque pixel */
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uint32_t* current = (uint32_t*) buffer;
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for (x=0; x < rect->width; x++) {
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/* Rectangle is non-opaque if a single non-opaque pixel is found */
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uint32_t color = *(current++);
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if ((color & 0xFF000000) != 0xFF000000)
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return 0;
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}
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/* Next row */
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buffer += stride;
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}
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/* Rectangle is opaque */
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return 1;
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}
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/**
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* Returns whether the given rectangle should be combined into the existing
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* dirty rectangle, to be eventually flushed as image data, or would be best
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* kept independent of the current rectangle.
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*
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* @param surface
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* The surface being updated.
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*
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* @param rect
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* The bounding rectangle of the updating being made to the surface.
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*
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* @param rect_only
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* Non-zero if this update, by its nature, contains only metainformation
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* about the update's bounding rectangle, zero if the update also contains
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* image data.
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*
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* @return
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* Non-zero if the update should be combined with any existing update, zero
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* otherwise.
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*/
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static int __guac_common_should_combine(guac_common_surface* surface, const guac_common_rect* rect, int rect_only) {
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/* Always favor combining updates if surface is currently a purely
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* server-side scratch area */
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if (!surface->realized)
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return 1;
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if (surface->dirty) {
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int combined_cost, dirty_cost, update_cost;
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/* Simulate combination */
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guac_common_rect combined = surface->dirty_rect;
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guac_common_rect_extend(&combined, rect);
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/* Combine if result is still small */
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if (combined.width <= GUAC_SURFACE_NEGLIGIBLE_WIDTH && combined.height <= GUAC_SURFACE_NEGLIGIBLE_HEIGHT)
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return 1;
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/* Estimate costs of the existing update, new update, and both combined */
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combined_cost = GUAC_SURFACE_BASE_COST + combined.width * combined.height;
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dirty_cost = GUAC_SURFACE_BASE_COST + surface->dirty_rect.width * surface->dirty_rect.height;
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update_cost = GUAC_SURFACE_BASE_COST + rect->width * rect->height;
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/* Reduce cost if no image data */
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if (rect_only)
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update_cost /= GUAC_SURFACE_DATA_FACTOR;
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/* Combine if cost estimate shows benefit */
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if (combined_cost <= update_cost + dirty_cost)
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return 1;
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/* Combine if increase in cost is negligible */
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if (combined_cost - dirty_cost <= dirty_cost / GUAC_SURFACE_NEGLIGIBLE_INCREASE)
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return 1;
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if (combined_cost - update_cost <= update_cost / GUAC_SURFACE_NEGLIGIBLE_INCREASE)
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return 1;
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/* Combine if we anticipate further updates, as this update follows a common fill pattern */
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if (rect->x == surface->dirty_rect.x && rect->y == surface->dirty_rect.y + surface->dirty_rect.height) {
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if (combined_cost <= (dirty_cost + update_cost) * GUAC_SURFACE_FILL_PATTERN_FACTOR)
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return 1;
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}
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}
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/* Otherwise, do not combine */
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return 0;
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}
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/**
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* Expands the dirty rect of the given surface to contain the rect described by the given
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* coordinates.
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*
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* @param surface The surface to mark as dirty.
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* @param rect The rectangle of the update which is dirtying the surface.
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*/
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static void __guac_common_mark_dirty(guac_common_surface* surface, const guac_common_rect* rect) {
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/* Ignore empty rects */
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if (rect->width <= 0 || rect->height <= 0)
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return;
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/* If already dirty, update existing rect */
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if (surface->dirty)
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guac_common_rect_extend(&surface->dirty_rect, rect);
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/* Otherwise init dirty rect */
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else {
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surface->dirty_rect = *rect;
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surface->dirty = 1;
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}
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}
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/**
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* Calculate the current average framerate for a given area on the surface.
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*
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* @param surface
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* The surface on which the framerate will be calculated.
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*
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* @param rect
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* The rect containing the area for which the average framerate will be
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* calculated.
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*
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* @return
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* The average framerate of the given area, in frames per second.
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*/
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static unsigned int __guac_common_surface_calculate_framerate(
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guac_common_surface* surface, const guac_common_rect* rect) {
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int x, y;
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/* Calculate heat map dimensions */
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int heat_width = GUAC_COMMON_SURFACE_HEAT_DIMENSION(surface->width);
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/* Calculate minimum X/Y coordinates intersecting given rect */
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int min_x = rect->x / GUAC_COMMON_SURFACE_HEAT_CELL_SIZE;
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int min_y = rect->y / GUAC_COMMON_SURFACE_HEAT_CELL_SIZE;
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/* Calculate maximum X/Y coordinates intersecting given rect */
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int max_x = min_x + (rect->width - 1) / GUAC_COMMON_SURFACE_HEAT_CELL_SIZE;
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int max_y = min_y + (rect->height - 1) / GUAC_COMMON_SURFACE_HEAT_CELL_SIZE;
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unsigned int sum_framerate = 0;
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unsigned int count = 0;
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/* Get start of buffer at given coordinates */
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const guac_common_surface_heat_cell* heat_row =
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surface->heat_map + min_y * heat_width + min_x;
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/* Iterate over all the heat map cells for the area
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* and calculate the average framerate */
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for (y = min_y; y < max_y; y++) {
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/* Get current row of heat map */
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const guac_common_surface_heat_cell* heat_cell = heat_row;
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/* For each cell in subset of row */
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for (x = min_x; x < max_x; x++) {
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/* Calculate indicies for latest and oldest history entries */
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int oldest_entry = heat_cell->oldest_entry;
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int latest_entry = oldest_entry - 1;
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if (latest_entry < 0)
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latest_entry = GUAC_COMMON_SURFACE_HEAT_CELL_HISTORY_SIZE - 1;
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/* Calculate elapsed time covering entire history for this cell */
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int elapsed_time = heat_cell->history[latest_entry]
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- heat_cell->history[oldest_entry];
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/* Calculate and add framerate */
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if (elapsed_time)
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sum_framerate += GUAC_COMMON_SURFACE_HEAT_CELL_HISTORY_SIZE
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* 1000 / elapsed_time;
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/* Next heat map cell */
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heat_cell++;
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count++;
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}
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/* Next heat map row */
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heat_row += heat_width;
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}
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/* Calculate the average framerate over entire rect */
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if (count)
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return sum_framerate / count;
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return 0;
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}
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/**
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* Guesses whether a rectangle within a particular surface would be better
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* compressed as PNG or using a lossy format like JPEG. Positive values
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* indicate PNG is likely to be superior, while negative values indicate the
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* opposite.
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*
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* @param surface
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* The surface containing the image data to check.
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*
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* @param rect
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* The rect to check within the given surface.
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*
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* @return
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* Positive values if PNG compression is likely to perform better than
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* lossy alternatives, or negative values if PNG is likely to perform
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* worse.
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*/
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static int __guac_common_surface_png_optimality(guac_common_surface* surface,
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const guac_common_rect* rect) {
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int x, y;
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int num_same = 0;
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int num_different = 1;
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/* Get image/buffer metrics */
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int width = rect->width;
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int height = rect->height;
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int stride = surface->stride;
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/* Get buffer from surface */
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unsigned char* buffer = surface->buffer + rect->y * stride + rect->x * 4;
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/* Image must be at least 1x1 */
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if (width < 1 || height < 1)
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return 0;
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/* For each row */
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for (y = 0; y < height; y++) {
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uint32_t* row = (uint32_t*) buffer;
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uint32_t last_pixel = *(row++) | 0xFF000000;
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/* For each pixel in current row */
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for (x = 1; x < width; x++) {
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/* Get next pixel */
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uint32_t current_pixel = *(row++) | 0xFF000000;
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/* Update same/different counts according to pixel value */
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if (current_pixel == last_pixel)
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num_same++;
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else
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num_different++;
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last_pixel = current_pixel;
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}
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/* Advance to next row */
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buffer += stride;
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}
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/* Return rough approximation of optimality for PNG compression */
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return 0x100 * num_same / num_different - 0x400;
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}
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/**
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* Returns whether the given rectangle would be optimally encoded as JPEG
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* rather than PNG.
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*
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* @param surface
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* The surface to be queried.
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*
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* @param rect
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* The rectangle to check.
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*
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* @return
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* Non-zero if the rectangle would be optimally encoded as JPEG, zero
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* otherwise.
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*/
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static int __guac_common_surface_should_use_jpeg(guac_common_surface* surface,
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const guac_common_rect* rect) {
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/* Calculate the average framerate for the given rect */
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int framerate = __guac_common_surface_calculate_framerate(surface, rect);
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int rect_size = rect->width * rect->height;
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/* JPEG is preferred if:
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* - frame rate is high enough
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* - image size is large enough
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* - PNG is not more optimal based on image contents */
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return framerate >= GUAC_COMMON_SURFACE_JPEG_FRAMERATE
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&& rect_size > GUAC_SURFACE_JPEG_MIN_BITMAP_SIZE
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&& __guac_common_surface_png_optimality(surface, rect) < 0;
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}
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/**
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* Returns whether the given rectangle would be optimally encoded as WebP
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* rather than PNG.
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*
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* @param surface
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* The surface to be queried.
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*
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* @param rect
|
|
* The rectangle to check.
|
|
*
|
|
* @return
|
|
* Non-zero if the rectangle would be optimally encoded as WebP, zero
|
|
* otherwise.
|
|
*/
|
|
static int __guac_common_surface_should_use_webp(guac_common_surface* surface,
|
|
const guac_common_rect* rect) {
|
|
|
|
/* Do not use WebP if not supported */
|
|
if (!guac_client_supports_webp(surface->client))
|
|
return 0;
|
|
|
|
/* Calculate the average framerate for the given rect */
|
|
int framerate = __guac_common_surface_calculate_framerate(surface, rect);
|
|
|
|
/* WebP is preferred if:
|
|
* - frame rate is high enough
|
|
* - PNG is not more optimal based on image contents */
|
|
return framerate >= GUAC_COMMON_SURFACE_JPEG_FRAMERATE
|
|
&& __guac_common_surface_png_optimality(surface, rect) < 0;
|
|
|
|
}
|
|
|
|
/**
|
|
* Updates the heat map cells which intersect the given rectangle using the
|
|
* given timestamp. This timestamp, along with timestamps from past updates,
|
|
* is used to calculate the framerate of each heat cell.
|
|
*
|
|
* @param surface
|
|
* The surface containing the heat map cells to be updated.
|
|
*
|
|
* @param rect
|
|
* The rectangle containing the heat map cells to be updated.
|
|
*
|
|
* @param time
|
|
* The timestamp to use when updating the heat map cells which intersect
|
|
* the given rectangle.
|
|
*/
|
|
static void __guac_common_surface_touch_rect(guac_common_surface* surface,
|
|
guac_common_rect* rect, guac_timestamp time) {
|
|
|
|
int x, y;
|
|
|
|
/* Calculate heat map dimensions */
|
|
int heat_width = GUAC_COMMON_SURFACE_HEAT_DIMENSION(surface->width);
|
|
|
|
/* Calculate minimum X/Y coordinates intersecting given rect */
|
|
int min_x = rect->x / GUAC_COMMON_SURFACE_HEAT_CELL_SIZE;
|
|
int min_y = rect->y / GUAC_COMMON_SURFACE_HEAT_CELL_SIZE;
|
|
|
|
/* Calculate maximum X/Y coordinates intersecting given rect */
|
|
int max_x = min_x + (rect->width - 1) / GUAC_COMMON_SURFACE_HEAT_CELL_SIZE;
|
|
int max_y = min_y + (rect->height - 1) / GUAC_COMMON_SURFACE_HEAT_CELL_SIZE;
|
|
|
|
/* Get start of buffer at given coordinates */
|
|
guac_common_surface_heat_cell* heat_row =
|
|
surface->heat_map + min_y * heat_width + min_x;
|
|
|
|
/* Update all heat map cells which intersect with rectangle */
|
|
for (y = min_y; y <= max_y; y++) {
|
|
|
|
/* Get current row of heat map */
|
|
guac_common_surface_heat_cell* heat_cell = heat_row;
|
|
|
|
/* For each cell in subset of row */
|
|
for (x = min_x; x <= max_x; x++) {
|
|
|
|
/* Replace oldest entry with new timestamp */
|
|
heat_cell->history[heat_cell->oldest_entry] = time;
|
|
|
|
/* Update to next oldest entry */
|
|
heat_cell->oldest_entry++;
|
|
if (heat_cell->oldest_entry >=
|
|
GUAC_COMMON_SURFACE_HEAT_CELL_HISTORY_SIZE)
|
|
heat_cell->oldest_entry = 0;
|
|
|
|
/* Advance to next heat map cell */
|
|
heat_cell++;
|
|
|
|
}
|
|
|
|
/* Next heat map row */
|
|
heat_row += heat_width;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Flushes the bitmap update currently described by the dirty rectangle within the
|
|
* given surface to that surface's bitmap queue. There MUST be space within the
|
|
* queue.
|
|
*
|
|
* @param surface The surface to flush.
|
|
*/
|
|
static void __guac_common_surface_flush_to_queue(guac_common_surface* surface) {
|
|
|
|
guac_common_surface_bitmap_rect* rect;
|
|
|
|
/* Do not flush if not dirty */
|
|
if (!surface->dirty)
|
|
return;
|
|
|
|
/* Add new rect to queue */
|
|
rect = &(surface->bitmap_queue[surface->bitmap_queue_length++]);
|
|
rect->rect = surface->dirty_rect;
|
|
rect->flushed = 0;
|
|
|
|
/* Surface now flushed */
|
|
surface->dirty = 0;
|
|
|
|
}
|
|
|
|
/**
|
|
* Flushes the given surface, drawing any pending operations on the remote
|
|
* display. Surface properties are not flushed.
|
|
*
|
|
* @param surface
|
|
* The surface to flush.
|
|
*/
|
|
static void __guac_common_surface_flush(guac_common_surface* surface);
|
|
|
|
/**
|
|
* Schedules a deferred flush of the given surface. This will not immediately
|
|
* flush the surface to the client. Instead, the result of the flush is
|
|
* added to a queue which is reinspected and combined (if possible) with other
|
|
* deferred flushes during the call to guac_common_surface_flush().
|
|
*
|
|
* @param surface The surface to flush.
|
|
*/
|
|
static void __guac_common_surface_flush_deferred(guac_common_surface* surface) {
|
|
|
|
/* Do not flush if not dirty */
|
|
if (!surface->dirty)
|
|
return;
|
|
|
|
/* Flush if queue size has reached maximum (space is reserved for the final
|
|
* dirty rect, as __guac_common_surface_flush() MAY add an additional rect
|
|
* to the queue */
|
|
if (surface->bitmap_queue_length == GUAC_COMMON_SURFACE_QUEUE_SIZE-1)
|
|
__guac_common_surface_flush(surface);
|
|
|
|
/* Append dirty rect to queue */
|
|
__guac_common_surface_flush_to_queue(surface);
|
|
|
|
}
|
|
|
|
/**
|
|
* Transfers a single uint32_t using the given transfer function.
|
|
*
|
|
* @param op The transfer function to use.
|
|
* @param src The source of the uint32_t value.
|
|
* @param dst THe destination which will hold the result of the transfer.
|
|
* @return Non-zero if the destination value was changed, zero otherwise.
|
|
*/
|
|
static int __guac_common_surface_transfer_int(guac_transfer_function op, uint32_t* src, uint32_t* dst) {
|
|
|
|
uint32_t orig = *dst;
|
|
|
|
switch (op) {
|
|
|
|
case GUAC_TRANSFER_BINARY_BLACK:
|
|
*dst = 0xFF000000;
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_WHITE:
|
|
*dst = 0xFFFFFFFF;
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_SRC:
|
|
*dst = *src;
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_DEST:
|
|
/* NOP */
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_NSRC:
|
|
*dst = *src ^ 0x00FFFFFF;
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_NDEST:
|
|
*dst = *dst ^ 0x00FFFFFF;
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_AND:
|
|
*dst = ((*dst) & (0xFF000000 | *src));
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_NAND:
|
|
*dst = ((*dst) & (0xFF000000 | *src)) ^ 0x00FFFFFF;
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_OR:
|
|
*dst = ((*dst) | (0x00FFFFFF & *src));
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_NOR:
|
|
*dst = ((*dst) | (0x00FFFFFF & *src)) ^ 0x00FFFFFF;
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_XOR:
|
|
*dst = ((*dst) ^ (0x00FFFFFF & *src));
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_XNOR:
|
|
*dst = ((*dst) ^ (0x00FFFFFF & *src)) ^ 0x00FFFFFF;
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_NSRC_AND:
|
|
*dst = ((*dst) & (0xFF000000 | (*src ^ 0x00FFFFFF)));
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_NSRC_NAND:
|
|
*dst = ((*dst) & (0xFF000000 | (*src ^ 0x00FFFFFF))) ^ 0x00FFFFFF;
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_NSRC_OR:
|
|
*dst = ((*dst) | (0x00FFFFFF & (*src ^ 0x00FFFFFF)));
|
|
break;
|
|
|
|
case GUAC_TRANSFER_BINARY_NSRC_NOR:
|
|
*dst = ((*dst) | (0x00FFFFFF & (*src ^ 0x00FFFFFF))) ^ 0x00FFFFFF;
|
|
break;
|
|
|
|
}
|
|
|
|
return *dst != orig;
|
|
|
|
}
|
|
|
|
/**
|
|
* Assigns the given value to all pixels within a rectangle of the backing
|
|
* surface of the given destination surface. The color of all pixels within the
|
|
* rectangle, including the alpha component, is entirely replaced.
|
|
*
|
|
* @param dst
|
|
* The destination surface.
|
|
*
|
|
* @param rect
|
|
* The rectangle to draw.
|
|
*
|
|
* @param red
|
|
* The red component of the color value to assign to all pixels within the
|
|
* rectangle.
|
|
*
|
|
* @param green
|
|
* The green component of the color value to assign to all pixels within
|
|
* the rectangle.
|
|
*
|
|
* @param blue
|
|
* The blue component of the color value to assign to all pixels within the
|
|
* rectangle.
|
|
*
|
|
* @param alpha
|
|
* The alpha component of the color value to assign to all pixels within
|
|
* the rectangle.
|
|
*/
|
|
static void __guac_common_surface_set(guac_common_surface* dst,
|
|
guac_common_rect* rect, int red, int green, int blue, int alpha) {
|
|
|
|
int x, y;
|
|
|
|
int dst_stride;
|
|
unsigned char* dst_buffer;
|
|
|
|
uint32_t color = (alpha << 24) | (red << 16) | (green << 8) | blue;
|
|
|
|
int min_x = rect->width - 1;
|
|
int min_y = rect->height - 1;
|
|
int max_x = 0;
|
|
int max_y = 0;
|
|
|
|
dst_stride = dst->stride;
|
|
dst_buffer = dst->buffer + (dst_stride * rect->y) + (4 * rect->x);
|
|
|
|
/* For each row */
|
|
for (y=0; y < rect->height; y++) {
|
|
|
|
uint32_t* dst_current = (uint32_t*) dst_buffer;
|
|
|
|
/* Set row */
|
|
for (x=0; x < rect->width; x++) {
|
|
|
|
uint32_t old_color = *dst_current;
|
|
|
|
if (old_color != color) {
|
|
if (x < min_x) min_x = x;
|
|
if (y < min_y) min_y = y;
|
|
if (x > max_x) max_x = x;
|
|
if (y > max_y) max_y = y;
|
|
*dst_current = color;
|
|
}
|
|
|
|
dst_current++;
|
|
}
|
|
|
|
/* Next row */
|
|
dst_buffer += dst_stride;
|
|
|
|
}
|
|
|
|
/* Restrict destination rect to only updated pixels */
|
|
if (max_x >= min_x && max_y >= min_y) {
|
|
rect->x += min_x;
|
|
rect->y += min_y;
|
|
rect->width = max_x - min_x + 1;
|
|
rect->height = max_y - min_y + 1;
|
|
}
|
|
else {
|
|
rect->width = 0;
|
|
rect->height = 0;
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Applies the Porter-Duff "over" composite operator, blending the two given
|
|
* color components using the given alpha value.
|
|
*
|
|
* @param dst
|
|
* The destination color component.
|
|
*
|
|
* @param src
|
|
* The source color component.
|
|
*
|
|
* @param alpha
|
|
* The alpha value which applies to the blending operation.
|
|
*
|
|
* @return
|
|
* The result of applying the Porter-Duff "over" composite operator to the
|
|
* given source and destination components.
|
|
*/
|
|
static int guac_common_surface_blend_component(int dst, int src, int alpha) {
|
|
|
|
int blended = src + dst * (0xFF - alpha);
|
|
|
|
/* Do not exceed maximum component value */
|
|
if (blended > 0xFF)
|
|
return 0xFF;
|
|
|
|
return blended;
|
|
|
|
}
|
|
|
|
/**
|
|
* Applies the Porter-Duff "over" composite operator, blending each component
|
|
* of the two given ARGB colors.
|
|
*
|
|
* @param dst
|
|
* The destination ARGB color.
|
|
*
|
|
* @param src
|
|
* The source ARGB color.
|
|
*
|
|
* @return
|
|
* The result of applying the Porter-Duff "over" composite operator to the
|
|
* given source and destination colors.
|
|
*/
|
|
static uint32_t guac_common_surface_argb_blend(uint32_t dst, uint32_t src) {
|
|
|
|
/* Separate destination ARGB color into its components */
|
|
int dst_a = (dst >> 24) & 0xFF;
|
|
int dst_r = (dst >> 16) & 0xFF;
|
|
int dst_g = (dst >> 8) & 0xFF;
|
|
int dst_b = dst & 0xFF;
|
|
|
|
/* Separate source ARGB color into its components */
|
|
int src_a = (src >> 24) & 0xFF;
|
|
int src_r = (src >> 16) & 0xFF;
|
|
int src_g = (src >> 8) & 0xFF;
|
|
int src_b = src & 0xFF;
|
|
|
|
/* If source is fully opaque (or destination is fully transparent), the
|
|
* blended result is the source */
|
|
if (src_a == 0xFF || dst_a == 0x00)
|
|
return src;
|
|
|
|
/* If source is fully transparent, the blended result is the destination */
|
|
if (src_a == 0x00)
|
|
return dst;
|
|
|
|
/* Otherwise, blend each ARGB component, assuming pre-multiplied alpha */
|
|
int r = guac_common_surface_blend_component(dst_r, src_r, src_a);
|
|
int g = guac_common_surface_blend_component(dst_g, src_g, src_a);
|
|
int b = guac_common_surface_blend_component(dst_b, src_b, src_a);
|
|
int a = guac_common_surface_blend_component(dst_a, src_a, src_a);
|
|
|
|
/* Recombine blended components */
|
|
return (a << 24) | (r << 16) | (g << 8) | b;
|
|
|
|
}
|
|
|
|
/**
|
|
* Copies data from the given buffer to the surface at the given coordinates.
|
|
* The dimensions and location of the destination rectangle will be altered
|
|
* to remove as many unchanged pixels as possible.
|
|
*
|
|
* @param src_buffer The buffer to copy.
|
|
* @param src_stride The number of bytes in each row of the source buffer.
|
|
* @param sx The X coordinate of the source rectangle.
|
|
* @param sy The Y coordinate of the source rectangle.
|
|
* @param dst The destination surface.
|
|
* @param rect The destination rectangle.
|
|
* @param opaque Non-zero if the source surface is opaque (its alpha channel
|
|
* should be ignored), zero otherwise.
|
|
*/
|
|
static void __guac_common_surface_put(unsigned char* src_buffer, int src_stride,
|
|
int* sx, int* sy,
|
|
guac_common_surface* dst, guac_common_rect* rect,
|
|
int opaque) {
|
|
|
|
unsigned char* dst_buffer = dst->buffer;
|
|
int dst_stride = dst->stride;
|
|
|
|
int x, y;
|
|
|
|
int min_x = rect->width;
|
|
int min_y = rect->height;
|
|
int max_x = 0;
|
|
int max_y = 0;
|
|
|
|
int orig_x = rect->x;
|
|
int orig_y = rect->y;
|
|
|
|
src_buffer += src_stride * (*sy) + 4 * (*sx);
|
|
dst_buffer += (dst_stride * rect->y) + (4 * rect->x);
|
|
|
|
/* For each row */
|
|
for (y=0; y < rect->height; y++) {
|
|
|
|
uint32_t* src_current = (uint32_t*) src_buffer;
|
|
uint32_t* dst_current = (uint32_t*) dst_buffer;
|
|
|
|
/* Copy row */
|
|
for (x=0; x < rect->width; x++) {
|
|
|
|
uint32_t color;
|
|
|
|
/* Get source and destination color values */
|
|
uint32_t src_color = *src_current;
|
|
uint32_t dst_color = *dst_current;
|
|
|
|
/* Ignore alpha channel if opaque */
|
|
if (opaque)
|
|
color = src_color | 0xFF000000;
|
|
|
|
/* Otherwise, perform alpha blending operation */
|
|
else
|
|
color = guac_common_surface_argb_blend(dst_color, src_color);
|
|
|
|
/* If the destination color is changing, update rectangle bounds
|
|
* and store the new color */
|
|
if (dst_color != color) {
|
|
if (x < min_x) min_x = x;
|
|
if (y < min_y) min_y = y;
|
|
if (x > max_x) max_x = x;
|
|
if (y > max_y) max_y = y;
|
|
*dst_current = color;
|
|
}
|
|
|
|
/* Advance to next pixel */
|
|
src_current++;
|
|
dst_current++;
|
|
|
|
}
|
|
|
|
/* Next row */
|
|
src_buffer += src_stride;
|
|
dst_buffer += dst_stride;
|
|
|
|
}
|
|
|
|
/* Restrict destination rect to only updated pixels */
|
|
if (max_x >= min_x && max_y >= min_y) {
|
|
rect->x += min_x;
|
|
rect->y += min_y;
|
|
rect->width = max_x - min_x + 1;
|
|
rect->height = max_y - min_y + 1;
|
|
}
|
|
else {
|
|
rect->width = 0;
|
|
rect->height = 0;
|
|
}
|
|
|
|
/* Update source X/Y */
|
|
*sx += rect->x - orig_x;
|
|
*sy += rect->y - orig_y;
|
|
|
|
}
|
|
|
|
/**
|
|
* Fills the given surface with color, using the given buffer as a mask. Color
|
|
* will be added to the given surface iff the corresponding pixel within the
|
|
* buffer is opaque.
|
|
*
|
|
* @param src_buffer The buffer to use as a mask.
|
|
* @param src_stride The number of bytes in each row of the source buffer.
|
|
* @param sx The X coordinate of the source rectangle.
|
|
* @param sy The Y coordinate of the source rectangle.
|
|
* @param dst The destination surface.
|
|
* @param rect The destination rectangle.
|
|
* @param red The red component of the color of the fill.
|
|
* @param green The green component of the color of the fill.
|
|
* @param blue The blue component of the color of the fill.
|
|
*/
|
|
static void __guac_common_surface_fill_mask(unsigned char* src_buffer, int src_stride,
|
|
int sx, int sy,
|
|
guac_common_surface* dst, guac_common_rect* rect,
|
|
int red, int green, int blue) {
|
|
|
|
unsigned char* dst_buffer = dst->buffer;
|
|
int dst_stride = dst->stride;
|
|
|
|
uint32_t color = 0xFF000000 | (red << 16) | (green << 8) | blue;
|
|
int x, y;
|
|
|
|
src_buffer += src_stride*sy + 4*sx;
|
|
dst_buffer += (dst_stride * rect->y) + (4 * rect->x);
|
|
|
|
/* For each row */
|
|
for (y=0; y < rect->height; y++) {
|
|
|
|
uint32_t* src_current = (uint32_t*) src_buffer;
|
|
uint32_t* dst_current = (uint32_t*) dst_buffer;
|
|
|
|
/* Stencil row */
|
|
for (x=0; x < rect->width; x++) {
|
|
|
|
/* Fill with color if opaque */
|
|
if (*src_current & 0xFF000000)
|
|
*dst_current = color;
|
|
|
|
src_current++;
|
|
dst_current++;
|
|
}
|
|
|
|
/* Next row */
|
|
src_buffer += src_stride;
|
|
dst_buffer += dst_stride;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Copies data from the given surface to the given destination surface using
|
|
* the specified transfer function.
|
|
*
|
|
* @param src_buffer The buffer to copy.
|
|
* @param src_stride The number of bytes in each row of the source buffer.
|
|
* @param sx The X coordinate of the source rectangle.
|
|
* @param sy The Y coordinate of the source rectangle.
|
|
* @param op The transfer function to use.
|
|
* @param dst The destination surface.
|
|
* @param rect The destination rectangle.
|
|
*/
|
|
static void __guac_common_surface_transfer(guac_common_surface* src, int* sx, int* sy,
|
|
guac_transfer_function op,
|
|
guac_common_surface* dst, guac_common_rect* rect) {
|
|
|
|
unsigned char* src_buffer = src->buffer;
|
|
unsigned char* dst_buffer = dst->buffer;
|
|
|
|
int x, y;
|
|
int src_stride, dst_stride;
|
|
int step = 1;
|
|
|
|
int min_x = rect->width - 1;
|
|
int min_y = rect->height - 1;
|
|
int max_x = 0;
|
|
int max_y = 0;
|
|
|
|
int orig_x = rect->x;
|
|
int orig_y = rect->y;
|
|
|
|
/* Copy forwards only if destination is in a different surface or is before source */
|
|
if (src != dst || rect->y < *sy || (rect->y == *sy && rect->x < *sx)) {
|
|
src_buffer += src->stride * (*sy) + 4 * (*sx);
|
|
dst_buffer += (dst->stride * rect->y) + (4 * rect->x);
|
|
src_stride = src->stride;
|
|
dst_stride = dst->stride;
|
|
step = 1;
|
|
}
|
|
|
|
/* Otherwise, copy backwards */
|
|
else {
|
|
src_buffer += src->stride * (*sy + rect->height - 1) + 4 * (*sx + rect->width - 1);
|
|
dst_buffer += dst->stride * (rect->y + rect->height - 1) + 4 * (rect->x + rect->width - 1);
|
|
src_stride = -src->stride;
|
|
dst_stride = -dst->stride;
|
|
step = -1;
|
|
}
|
|
|
|
/* For each row */
|
|
for (y=0; y < rect->height; y++) {
|
|
|
|
uint32_t* src_current = (uint32_t*) src_buffer;
|
|
uint32_t* dst_current = (uint32_t*) dst_buffer;
|
|
|
|
/* Transfer each pixel in row */
|
|
for (x=0; x < rect->width; x++) {
|
|
|
|
if (__guac_common_surface_transfer_int(op, src_current, dst_current)) {
|
|
if (x < min_x) min_x = x;
|
|
if (y < min_y) min_y = y;
|
|
if (x > max_x) max_x = x;
|
|
if (y > max_y) max_y = y;
|
|
}
|
|
|
|
src_current += step;
|
|
dst_current += step;
|
|
}
|
|
|
|
/* Next row */
|
|
src_buffer += src_stride;
|
|
dst_buffer += dst_stride;
|
|
|
|
}
|
|
|
|
/* Translate X coordinate space of moving backwards */
|
|
if (step < 0) {
|
|
int old_max_x = max_x;
|
|
max_x = rect->width - 1 - min_x;
|
|
min_x = rect->width - 1 - old_max_x;
|
|
}
|
|
|
|
/* Translate Y coordinate space of moving backwards */
|
|
if (dst_stride < 0) {
|
|
int old_max_y = max_y;
|
|
max_y = rect->height - 1 - min_y;
|
|
min_y = rect->height - 1 - old_max_y;
|
|
}
|
|
|
|
/* Restrict destination rect to only updated pixels */
|
|
if (max_x >= min_x && max_y >= min_y) {
|
|
rect->x += min_x;
|
|
rect->y += min_y;
|
|
rect->width = max_x - min_x + 1;
|
|
rect->height = max_y - min_y + 1;
|
|
}
|
|
else {
|
|
rect->width = 0;
|
|
rect->height = 0;
|
|
}
|
|
|
|
/* Update source X/Y */
|
|
*sx += rect->x - orig_x;
|
|
*sy += rect->y - orig_y;
|
|
|
|
}
|
|
|
|
guac_common_surface* guac_common_surface_alloc(guac_client* client,
|
|
guac_socket* socket, const guac_layer* layer, int w, int h) {
|
|
|
|
/* Calculate heat map dimensions */
|
|
int heat_width = GUAC_COMMON_SURFACE_HEAT_DIMENSION(w);
|
|
int heat_height = GUAC_COMMON_SURFACE_HEAT_DIMENSION(h);
|
|
|
|
/* Init surface */
|
|
guac_common_surface* surface = calloc(1, sizeof(guac_common_surface));
|
|
surface->client = client;
|
|
surface->socket = socket;
|
|
surface->layer = layer;
|
|
surface->parent = GUAC_DEFAULT_LAYER;
|
|
surface->opacity = 0xFF;
|
|
surface->width = w;
|
|
surface->height = h;
|
|
|
|
pthread_mutex_init(&surface->_lock, NULL);
|
|
|
|
/* Create corresponding Cairo surface */
|
|
surface->stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, w);
|
|
surface->buffer = calloc(h, surface->stride);
|
|
|
|
/* Create corresponding heat map */
|
|
surface->heat_map = calloc(heat_width * heat_height,
|
|
sizeof(guac_common_surface_heat_cell));
|
|
|
|
/* Reset clipping rect */
|
|
guac_common_surface_reset_clip(surface);
|
|
|
|
/* Layers must initially exist */
|
|
if (layer->index >= 0) {
|
|
guac_protocol_send_size(socket, layer, w, h);
|
|
surface->realized = 1;
|
|
}
|
|
|
|
/* Defer creation of buffers */
|
|
else
|
|
surface->realized = 0;
|
|
|
|
return surface;
|
|
}
|
|
|
|
void guac_common_surface_free(guac_common_surface* surface) {
|
|
|
|
/* Only dispose of surface if it exists */
|
|
if (surface->realized)
|
|
guac_protocol_send_dispose(surface->socket, surface->layer);
|
|
|
|
pthread_mutex_destroy(&surface->_lock);
|
|
|
|
free(surface->heat_map);
|
|
free(surface->buffer);
|
|
free(surface);
|
|
|
|
}
|
|
|
|
void guac_common_surface_resize(guac_common_surface* surface, int w, int h) {
|
|
|
|
pthread_mutex_lock(&surface->_lock);
|
|
|
|
/* Ignore if resize will have no effect */
|
|
if (w == surface->width && h == surface->height)
|
|
goto complete;
|
|
|
|
guac_socket* socket = surface->socket;
|
|
const guac_layer* layer = surface->layer;
|
|
|
|
unsigned char* old_buffer;
|
|
int old_stride;
|
|
guac_common_rect old_rect;
|
|
|
|
int sx = 0;
|
|
int sy = 0;
|
|
|
|
/* Calculate heat map dimensions */
|
|
int heat_width = GUAC_COMMON_SURFACE_HEAT_DIMENSION(w);
|
|
int heat_height = GUAC_COMMON_SURFACE_HEAT_DIMENSION(h);
|
|
|
|
/* Copy old surface data */
|
|
old_buffer = surface->buffer;
|
|
old_stride = surface->stride;
|
|
guac_common_rect_init(&old_rect, 0, 0, surface->width, surface->height);
|
|
|
|
/* Re-initialize at new size */
|
|
surface->width = w;
|
|
surface->height = h;
|
|
surface->stride = cairo_format_stride_for_width(CAIRO_FORMAT_ARGB32, w);
|
|
surface->buffer = calloc(h, surface->stride);
|
|
__guac_common_bound_rect(surface, &surface->clip_rect, NULL, NULL);
|
|
|
|
/* Copy relevant old data */
|
|
__guac_common_bound_rect(surface, &old_rect, NULL, NULL);
|
|
__guac_common_surface_put(old_buffer, old_stride, &sx, &sy, surface, &old_rect, 1);
|
|
|
|
/* Free old data */
|
|
free(old_buffer);
|
|
|
|
/* Allocate completely new heat map (can safely discard old stats) */
|
|
free(surface->heat_map);
|
|
surface->heat_map = calloc(heat_width * heat_height,
|
|
sizeof(guac_common_surface_heat_cell));
|
|
|
|
/* Resize dirty rect to fit new surface dimensions */
|
|
if (surface->dirty) {
|
|
__guac_common_bound_rect(surface, &surface->dirty_rect, NULL, NULL);
|
|
if (surface->dirty_rect.width <= 0 || surface->dirty_rect.height <= 0)
|
|
surface->dirty = 0;
|
|
}
|
|
|
|
/* Update Guacamole layer */
|
|
if (surface->realized)
|
|
guac_protocol_send_size(socket, layer, w, h);
|
|
|
|
complete:
|
|
pthread_mutex_unlock(&surface->_lock);
|
|
|
|
}
|
|
|
|
void guac_common_surface_draw(guac_common_surface* surface, int x, int y, cairo_surface_t* src) {
|
|
|
|
pthread_mutex_lock(&surface->_lock);
|
|
|
|
unsigned char* buffer = cairo_image_surface_get_data(src);
|
|
cairo_format_t format = cairo_image_surface_get_format(src);
|
|
int stride = cairo_image_surface_get_stride(src);
|
|
int w = cairo_image_surface_get_width(src);
|
|
int h = cairo_image_surface_get_height(src);
|
|
|
|
int sx = 0;
|
|
int sy = 0;
|
|
|
|
guac_common_rect rect;
|
|
guac_common_rect_init(&rect, x, y, w, h);
|
|
|
|
/* Clip operation */
|
|
__guac_common_clip_rect(surface, &rect, &sx, &sy);
|
|
if (rect.width <= 0 || rect.height <= 0)
|
|
goto complete;
|
|
|
|
/* Update backing surface */
|
|
__guac_common_surface_put(buffer, stride, &sx, &sy, surface, &rect, format != CAIRO_FORMAT_ARGB32);
|
|
if (rect.width <= 0 || rect.height <= 0)
|
|
goto complete;
|
|
|
|
/* Update the heat map for the update rectangle. */
|
|
guac_timestamp time = guac_timestamp_current();
|
|
__guac_common_surface_touch_rect(surface, &rect, time);
|
|
|
|
/* Flush if not combining */
|
|
if (!__guac_common_should_combine(surface, &rect, 0))
|
|
__guac_common_surface_flush_deferred(surface);
|
|
|
|
/* Always defer draws */
|
|
__guac_common_mark_dirty(surface, &rect);
|
|
|
|
complete:
|
|
pthread_mutex_unlock(&surface->_lock);
|
|
|
|
}
|
|
|
|
void guac_common_surface_paint(guac_common_surface* surface, int x, int y,
|
|
cairo_surface_t* src, int red, int green, int blue) {
|
|
|
|
pthread_mutex_lock(&surface->_lock);
|
|
|
|
unsigned char* buffer = cairo_image_surface_get_data(src);
|
|
int stride = cairo_image_surface_get_stride(src);
|
|
int w = cairo_image_surface_get_width(src);
|
|
int h = cairo_image_surface_get_height(src);
|
|
|
|
int sx = 0;
|
|
int sy = 0;
|
|
|
|
guac_common_rect rect;
|
|
guac_common_rect_init(&rect, x, y, w, h);
|
|
|
|
/* Clip operation */
|
|
__guac_common_clip_rect(surface, &rect, &sx, &sy);
|
|
if (rect.width <= 0 || rect.height <= 0)
|
|
goto complete;
|
|
|
|
/* Update backing surface */
|
|
__guac_common_surface_fill_mask(buffer, stride, sx, sy, surface, &rect, red, green, blue);
|
|
|
|
/* Flush if not combining */
|
|
if (!__guac_common_should_combine(surface, &rect, 0))
|
|
__guac_common_surface_flush_deferred(surface);
|
|
|
|
/* Always defer draws */
|
|
__guac_common_mark_dirty(surface, &rect);
|
|
|
|
complete:
|
|
pthread_mutex_unlock(&surface->_lock);
|
|
|
|
}
|
|
|
|
void guac_common_surface_copy(guac_common_surface* src, int sx, int sy,
|
|
int w, int h, guac_common_surface* dst, int dx, int dy) {
|
|
|
|
/* Lock both surfaces */
|
|
pthread_mutex_lock(&dst->_lock);
|
|
if (src != dst)
|
|
pthread_mutex_lock(&src->_lock);
|
|
|
|
guac_socket* socket = dst->socket;
|
|
const guac_layer* src_layer = src->layer;
|
|
const guac_layer* dst_layer = dst->layer;
|
|
|
|
guac_common_rect srect;
|
|
guac_common_rect_init(&srect, sx, sy, w, h);
|
|
|
|
/* Clip operation source rect to bounds */
|
|
__guac_common_bound_rect(src, &srect, &dx, &dy);
|
|
if (srect.width <= 0 || srect.height <= 0)
|
|
goto complete;
|
|
|
|
guac_common_rect drect;
|
|
guac_common_rect_init(&drect, dx, dy,
|
|
srect.width, srect.height);
|
|
|
|
/* Clip operation destination rect */
|
|
__guac_common_clip_rect(dst, &drect, &srect.x, &srect.y);
|
|
if (drect.width <= 0 || drect.height <= 0)
|
|
goto complete;
|
|
|
|
/* NOTE: Being the last rectangle to be adjusted, only the width/height of
|
|
* drect is now correct! */
|
|
|
|
/* Update backing surface first only if drect cannot intersect srect */
|
|
if (src != dst) {
|
|
__guac_common_surface_transfer(src, &srect.x, &srect.y,
|
|
GUAC_TRANSFER_BINARY_SRC, dst, &drect);
|
|
if (drect.width <= 0 || drect.height <= 0)
|
|
goto complete;
|
|
}
|
|
|
|
/* Defer if combining */
|
|
if (__guac_common_should_combine(dst, &drect, 1))
|
|
__guac_common_mark_dirty(dst, &drect);
|
|
|
|
/* Otherwise, flush and draw immediately */
|
|
else {
|
|
__guac_common_surface_flush(dst);
|
|
__guac_common_surface_flush(src);
|
|
guac_protocol_send_copy(socket, src_layer, srect.x, srect.y,
|
|
drect.width, drect.height, GUAC_COMP_OVER, dst_layer,
|
|
drect.x, drect.y);
|
|
dst->realized = 1;
|
|
}
|
|
|
|
/* Update backing surface last if drect can intersect srect */
|
|
if (src == dst)
|
|
__guac_common_surface_transfer(src, &srect.x, &srect.y,
|
|
GUAC_TRANSFER_BINARY_SRC, dst, &drect);
|
|
|
|
complete:
|
|
|
|
/* Unlock both surfaces */
|
|
pthread_mutex_unlock(&dst->_lock);
|
|
if (src != dst)
|
|
pthread_mutex_unlock(&src->_lock);
|
|
|
|
}
|
|
|
|
void guac_common_surface_transfer(guac_common_surface* src, int sx, int sy, int w, int h,
|
|
guac_transfer_function op, guac_common_surface* dst, int dx, int dy) {
|
|
|
|
/* Lock both surfaces */
|
|
pthread_mutex_lock(&dst->_lock);
|
|
if (src != dst)
|
|
pthread_mutex_lock(&src->_lock);
|
|
|
|
guac_socket* socket = dst->socket;
|
|
const guac_layer* src_layer = src->layer;
|
|
const guac_layer* dst_layer = dst->layer;
|
|
|
|
guac_common_rect srect;
|
|
guac_common_rect_init(&srect, sx, sy, w, h);
|
|
|
|
/* Clip operation source rect to bounds */
|
|
__guac_common_bound_rect(src, &srect, &dx, &dy);
|
|
if (srect.width <= 0 || srect.height <= 0)
|
|
goto complete;
|
|
|
|
guac_common_rect drect;
|
|
guac_common_rect_init(&drect, dx, dy,
|
|
srect.width, srect.height);
|
|
|
|
/* Clip operation destination rect */
|
|
__guac_common_clip_rect(dst, &drect, &srect.x, &srect.y);
|
|
if (drect.width <= 0 || drect.height <= 0)
|
|
goto complete;
|
|
|
|
/* NOTE: Being the last rectangle to be adjusted, only the width/height of
|
|
* drect is now correct! */
|
|
|
|
/* Update backing surface first only if drect cannot intersect srect */
|
|
if (src != dst) {
|
|
__guac_common_surface_transfer(src, &srect.x, &srect.y, op, dst, &drect);
|
|
if (drect.width <= 0 || drect.height <= 0)
|
|
goto complete;
|
|
}
|
|
|
|
/* Defer if combining */
|
|
if (__guac_common_should_combine(dst, &drect, 1))
|
|
__guac_common_mark_dirty(dst, &drect);
|
|
|
|
/* Otherwise, flush and draw immediately */
|
|
else {
|
|
__guac_common_surface_flush(dst);
|
|
__guac_common_surface_flush(src);
|
|
guac_protocol_send_transfer(socket, src_layer, srect.x, srect.y,
|
|
drect.width, drect.height, op, dst_layer, drect.x, drect.y);
|
|
dst->realized = 1;
|
|
}
|
|
|
|
/* Update backing surface last if drect can intersect srect */
|
|
if (src == dst)
|
|
__guac_common_surface_transfer(src, &srect.x, &srect.y, op, dst, &drect);
|
|
|
|
complete:
|
|
|
|
/* Unlock both surfaces */
|
|
pthread_mutex_unlock(&dst->_lock);
|
|
if (src != dst)
|
|
pthread_mutex_unlock(&src->_lock);
|
|
|
|
}
|
|
|
|
void guac_common_surface_set(guac_common_surface* surface,
|
|
int x, int y, int w, int h, int red, int green, int blue, int alpha) {
|
|
|
|
pthread_mutex_lock(&surface->_lock);
|
|
|
|
guac_socket* socket = surface->socket;
|
|
const guac_layer* layer = surface->layer;
|
|
|
|
guac_common_rect rect;
|
|
guac_common_rect_init(&rect, x, y, w, h);
|
|
|
|
/* Clip operation */
|
|
__guac_common_clip_rect(surface, &rect, NULL, NULL);
|
|
if (rect.width <= 0 || rect.height <= 0)
|
|
goto complete;
|
|
|
|
/* Update backing surface */
|
|
__guac_common_surface_set(surface, &rect, red, green, blue, alpha);
|
|
if (rect.width <= 0 || rect.height <= 0)
|
|
goto complete;
|
|
|
|
/* Handle as normal draw if non-opaque */
|
|
if (alpha != 0xFF) {
|
|
|
|
/* Flush if not combining */
|
|
if (!__guac_common_should_combine(surface, &rect, 0))
|
|
__guac_common_surface_flush_deferred(surface);
|
|
|
|
/* Always defer draws */
|
|
__guac_common_mark_dirty(surface, &rect);
|
|
|
|
}
|
|
|
|
/* Defer if combining */
|
|
else if (__guac_common_should_combine(surface, &rect, 1))
|
|
__guac_common_mark_dirty(surface, &rect);
|
|
|
|
/* Otherwise, flush and draw immediately */
|
|
else {
|
|
__guac_common_surface_flush(surface);
|
|
guac_protocol_send_rect(socket, layer, rect.x, rect.y, rect.width, rect.height);
|
|
guac_protocol_send_cfill(socket, GUAC_COMP_OVER, layer, red, green, blue, alpha);
|
|
surface->realized = 1;
|
|
}
|
|
|
|
complete:
|
|
pthread_mutex_unlock(&surface->_lock);
|
|
|
|
}
|
|
|
|
void guac_common_surface_clip(guac_common_surface* surface, int x, int y, int w, int h) {
|
|
|
|
pthread_mutex_lock(&surface->_lock);
|
|
|
|
guac_common_rect clip;
|
|
|
|
/* Init clipping rectangle if clipping not already applied */
|
|
if (!surface->clipped) {
|
|
guac_common_rect_init(&surface->clip_rect, 0, 0, surface->width, surface->height);
|
|
surface->clipped = 1;
|
|
}
|
|
|
|
guac_common_rect_init(&clip, x, y, w, h);
|
|
guac_common_rect_constrain(&surface->clip_rect, &clip);
|
|
|
|
pthread_mutex_unlock(&surface->_lock);
|
|
|
|
}
|
|
|
|
void guac_common_surface_reset_clip(guac_common_surface* surface) {
|
|
pthread_mutex_lock(&surface->_lock);
|
|
surface->clipped = 0;
|
|
pthread_mutex_unlock(&surface->_lock);
|
|
}
|
|
|
|
/**
|
|
* Flushes the bitmap update currently described by the dirty rectangle within
|
|
* the given surface directly via an "img" instruction as PNG data. The
|
|
* resulting instructions will be sent over the socket associated with the
|
|
* given surface.
|
|
*
|
|
* @param surface
|
|
* The surface to flush.
|
|
*
|
|
* @param opaque
|
|
* Whether the rectangle being flushed contains only fully-opaque pixels.
|
|
*/
|
|
static void __guac_common_surface_flush_to_png(guac_common_surface* surface,
|
|
int opaque) {
|
|
|
|
if (surface->dirty) {
|
|
|
|
guac_socket* socket = surface->socket;
|
|
const guac_layer* layer = surface->layer;
|
|
|
|
/* Get Cairo surface for specified rect */
|
|
unsigned char* buffer = surface->buffer
|
|
+ surface->dirty_rect.y * surface->stride
|
|
+ surface->dirty_rect.x * 4;
|
|
|
|
cairo_surface_t* rect;
|
|
|
|
/* Use RGB24 if the image is fully opaque */
|
|
if (opaque)
|
|
rect = cairo_image_surface_create_for_data(buffer,
|
|
CAIRO_FORMAT_RGB24, surface->dirty_rect.width,
|
|
surface->dirty_rect.height, surface->stride);
|
|
|
|
/* Otherwise ARGB32 is needed */
|
|
else {
|
|
|
|
rect = cairo_image_surface_create_for_data(buffer,
|
|
CAIRO_FORMAT_ARGB32, surface->dirty_rect.width,
|
|
surface->dirty_rect.height, surface->stride);
|
|
|
|
/* Clear destination rect first */
|
|
guac_protocol_send_rect(socket, layer,
|
|
surface->dirty_rect.x, surface->dirty_rect.y,
|
|
surface->dirty_rect.width, surface->dirty_rect.height);
|
|
guac_protocol_send_cfill(socket, GUAC_COMP_ROUT, layer,
|
|
0x00, 0x00, 0x00, 0xFF);
|
|
|
|
}
|
|
|
|
/* Send PNG for rect */
|
|
guac_client_stream_png(surface->client, socket, GUAC_COMP_OVER,
|
|
layer, surface->dirty_rect.x, surface->dirty_rect.y, rect);
|
|
|
|
cairo_surface_destroy(rect);
|
|
surface->realized = 1;
|
|
|
|
/* Surface is no longer dirty */
|
|
surface->dirty = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Returns an appropriate quality between 0 and 100 for lossy encoding
|
|
* depending on the current processing lag calculated for the given client.
|
|
*
|
|
* @param client
|
|
* The client for which the lossy quality is being calculated.
|
|
*
|
|
* @return
|
|
* A value between 0 and 100 inclusive which seems appropriate for the
|
|
* client based on lag measurements.
|
|
*/
|
|
static int guac_common_surface_suggest_quality(guac_client* client) {
|
|
|
|
int lag = guac_client_get_processing_lag(client);
|
|
|
|
/* Scale quality linearly from 90 to 30 as lag varies from 20ms to 80ms */
|
|
int quality = 90 - (lag - 20);
|
|
|
|
/* Do not exceed 90 for quality */
|
|
if (quality > 90)
|
|
return 90;
|
|
|
|
/* Do not go below 30 for quality */
|
|
if (quality < 30)
|
|
return 30;
|
|
|
|
return quality;
|
|
|
|
}
|
|
|
|
/**
|
|
* Flushes the bitmap update currently described by the dirty rectangle within
|
|
* the given surface directly via an "img" instruction as JPEG data. The
|
|
* resulting instructions will be sent over the socket associated with the
|
|
* given surface.
|
|
*
|
|
* @param surface
|
|
* The surface to flush.
|
|
*/
|
|
static void __guac_common_surface_flush_to_jpeg(guac_common_surface* surface) {
|
|
|
|
if (surface->dirty) {
|
|
|
|
guac_socket* socket = surface->socket;
|
|
const guac_layer* layer = surface->layer;
|
|
|
|
guac_common_rect max;
|
|
guac_common_rect_init(&max, 0, 0, surface->width, surface->height);
|
|
|
|
/* Expand the dirty rect size to fit in a grid with cells equal to the
|
|
* minimum JPEG block size */
|
|
guac_common_rect_expand_to_grid(GUAC_SURFACE_JPEG_BLOCK_SIZE,
|
|
&surface->dirty_rect, &max);
|
|
|
|
/* Get Cairo surface for specified rect */
|
|
unsigned char* buffer = surface->buffer
|
|
+ surface->dirty_rect.y * surface->stride
|
|
+ surface->dirty_rect.x * 4;
|
|
|
|
cairo_surface_t* rect = cairo_image_surface_create_for_data(buffer,
|
|
CAIRO_FORMAT_RGB24, surface->dirty_rect.width,
|
|
surface->dirty_rect.height, surface->stride);
|
|
|
|
/* Send JPEG for rect */
|
|
guac_client_stream_jpeg(surface->client, socket, GUAC_COMP_OVER, layer,
|
|
surface->dirty_rect.x, surface->dirty_rect.y, rect,
|
|
guac_common_surface_suggest_quality(surface->client));
|
|
|
|
cairo_surface_destroy(rect);
|
|
surface->realized = 1;
|
|
|
|
/* Surface is no longer dirty */
|
|
surface->dirty = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Flushes the bitmap update currently described by the dirty rectangle within
|
|
* the given surface directly via an "img" instruction as WebP data. The
|
|
* resulting instructions will be sent over the socket associated with the
|
|
* given surface.
|
|
*
|
|
* @param surface
|
|
* The surface to flush.
|
|
*
|
|
* @param opaque
|
|
* Whether the rectangle being flushed contains only fully-opaque pixels.
|
|
*/
|
|
static void __guac_common_surface_flush_to_webp(guac_common_surface* surface,
|
|
int opaque) {
|
|
|
|
if (surface->dirty) {
|
|
|
|
guac_socket* socket = surface->socket;
|
|
const guac_layer* layer = surface->layer;
|
|
|
|
guac_common_rect max;
|
|
guac_common_rect_init(&max, 0, 0, surface->width, surface->height);
|
|
|
|
/* Expand the dirty rect size to fit in a grid with cells equal to the
|
|
* minimum WebP block size */
|
|
guac_common_rect_expand_to_grid(GUAC_SURFACE_WEBP_BLOCK_SIZE,
|
|
&surface->dirty_rect, &max);
|
|
|
|
/* Get Cairo surface for specified rect */
|
|
unsigned char* buffer = surface->buffer
|
|
+ surface->dirty_rect.y * surface->stride
|
|
+ surface->dirty_rect.x * 4;
|
|
|
|
cairo_surface_t* rect;
|
|
|
|
/* Use RGB24 if the image is fully opaque */
|
|
if (opaque)
|
|
rect = cairo_image_surface_create_for_data(buffer,
|
|
CAIRO_FORMAT_RGB24, surface->dirty_rect.width,
|
|
surface->dirty_rect.height, surface->stride);
|
|
|
|
/* Otherwise ARGB32 is needed */
|
|
else
|
|
rect = cairo_image_surface_create_for_data(buffer,
|
|
CAIRO_FORMAT_ARGB32, surface->dirty_rect.width,
|
|
surface->dirty_rect.height, surface->stride);
|
|
|
|
/* Send WebP for rect */
|
|
guac_client_stream_webp(surface->client, socket, GUAC_COMP_OVER, layer,
|
|
surface->dirty_rect.x, surface->dirty_rect.y, rect,
|
|
guac_common_surface_suggest_quality(surface->client), 0);
|
|
|
|
cairo_surface_destroy(rect);
|
|
surface->realized = 1;
|
|
|
|
/* Surface is no longer dirty */
|
|
surface->dirty = 0;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
/**
|
|
* Comparator for instances of guac_common_surface_bitmap_rect, the elements
|
|
* which make up a surface's bitmap buffer.
|
|
*
|
|
* @see qsort
|
|
*/
|
|
static int __guac_common_surface_bitmap_rect_compare(const void* a, const void* b) {
|
|
|
|
guac_common_surface_bitmap_rect* ra = (guac_common_surface_bitmap_rect*) a;
|
|
guac_common_surface_bitmap_rect* rb = (guac_common_surface_bitmap_rect*) b;
|
|
|
|
/* Order roughly top to bottom, left to right */
|
|
if (ra->rect.y != rb->rect.y) return ra->rect.y - rb->rect.y;
|
|
if (ra->rect.x != rb->rect.x) return ra->rect.x - rb->rect.x;
|
|
|
|
/* Wider updates should come first (more likely to intersect later) */
|
|
if (ra->rect.width != rb->rect.width) return rb->rect.width - ra->rect.width;
|
|
|
|
/* Shorter updates should come first (less likely to increase cost) */
|
|
return ra->rect.height - rb->rect.height;
|
|
|
|
}
|
|
|
|
/**
|
|
* Flushes only the properties of the given surface, such as layer location or
|
|
* opacity. Image state is not flushed. If the surface represents a buffer or
|
|
* the default layer, this function has no effect.
|
|
*
|
|
* @param surface
|
|
* The surface to flush.
|
|
*/
|
|
static void __guac_common_surface_flush_properties(
|
|
guac_common_surface* surface) {
|
|
|
|
guac_socket* socket = surface->socket;
|
|
|
|
/* Only applicable to non-default visible layers */
|
|
if (surface->layer->index <= 0)
|
|
return;
|
|
|
|
/* Flush opacity */
|
|
if (surface->opacity_dirty) {
|
|
guac_protocol_send_shade(socket, surface->layer, surface->opacity);
|
|
surface->opacity_dirty = 0;
|
|
}
|
|
|
|
/* Flush location and hierarchy */
|
|
if (surface->location_dirty) {
|
|
guac_protocol_send_move(socket, surface->layer,
|
|
surface->parent, surface->x, surface->y, surface->z);
|
|
surface->location_dirty = 0;
|
|
}
|
|
|
|
}
|
|
|
|
static void __guac_common_surface_flush(guac_common_surface* surface) {
|
|
|
|
/* Flush final dirty rectangle to queue. */
|
|
__guac_common_surface_flush_to_queue(surface);
|
|
|
|
guac_common_surface_bitmap_rect* current = surface->bitmap_queue;
|
|
int i, j;
|
|
int original_queue_length;
|
|
int flushed = 0;
|
|
|
|
original_queue_length = surface->bitmap_queue_length;
|
|
|
|
/* Sort updates to make combination less costly */
|
|
qsort(surface->bitmap_queue, surface->bitmap_queue_length, sizeof(guac_common_surface_bitmap_rect),
|
|
__guac_common_surface_bitmap_rect_compare);
|
|
|
|
/* Flush all rects in queue */
|
|
for (i=0; i < surface->bitmap_queue_length; i++) {
|
|
|
|
/* Get next unflushed candidate */
|
|
guac_common_surface_bitmap_rect* candidate = current;
|
|
if (!candidate->flushed) {
|
|
|
|
int combined = 0;
|
|
|
|
/* Build up rect as much as possible */
|
|
for (j=i; j < surface->bitmap_queue_length; j++) {
|
|
|
|
if (!candidate->flushed) {
|
|
|
|
/* Clip candidate within current bounds */
|
|
__guac_common_bound_rect(surface, &candidate->rect, NULL, NULL);
|
|
if (candidate->rect.width <= 0 || candidate->rect.height <= 0)
|
|
candidate->flushed = 1;
|
|
|
|
/* Combine if reasonable */
|
|
else if (__guac_common_should_combine(surface, &candidate->rect, 0) || !surface->dirty) {
|
|
__guac_common_mark_dirty(surface, &candidate->rect);
|
|
candidate->flushed = 1;
|
|
combined++;
|
|
}
|
|
|
|
}
|
|
|
|
candidate++;
|
|
|
|
}
|
|
|
|
/* Re-add to queue if there's room and this update was modified or we expect others might be */
|
|
if ((combined > 1 || i < original_queue_length)
|
|
&& surface->bitmap_queue_length < GUAC_COMMON_SURFACE_QUEUE_SIZE)
|
|
__guac_common_surface_flush_to_queue(surface);
|
|
|
|
/* Flush as bitmap otherwise */
|
|
else if (surface->dirty) {
|
|
|
|
flushed++;
|
|
|
|
int opaque = __guac_common_surface_is_opaque(surface,
|
|
&surface->dirty_rect);
|
|
|
|
/* Prefer WebP when reasonable */
|
|
if (__guac_common_surface_should_use_webp(surface,
|
|
&surface->dirty_rect))
|
|
__guac_common_surface_flush_to_webp(surface, opaque);
|
|
|
|
/* If not WebP, JPEG is the next best (lossy) choice */
|
|
else if (opaque && __guac_common_surface_should_use_jpeg(
|
|
surface, &surface->dirty_rect))
|
|
__guac_common_surface_flush_to_jpeg(surface);
|
|
|
|
/* Use PNG if no lossy formats are appropriate */
|
|
else
|
|
__guac_common_surface_flush_to_png(surface, opaque);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
current++;
|
|
|
|
}
|
|
|
|
/* Flush complete */
|
|
surface->bitmap_queue_length = 0;
|
|
|
|
}
|
|
|
|
void guac_common_surface_flush(guac_common_surface* surface) {
|
|
|
|
pthread_mutex_lock(&surface->_lock);
|
|
|
|
/* Flush any applicable layer properties */
|
|
__guac_common_surface_flush_properties(surface);
|
|
|
|
/* Flush surface contents */
|
|
__guac_common_surface_flush(surface);
|
|
|
|
pthread_mutex_unlock(&surface->_lock);
|
|
|
|
}
|
|
|
|
void guac_common_surface_dup(guac_common_surface* surface, guac_user* user,
|
|
guac_socket* socket) {
|
|
|
|
pthread_mutex_lock(&surface->_lock);
|
|
|
|
/* Do nothing if not realized */
|
|
if (!surface->realized)
|
|
goto complete;
|
|
|
|
/* Synchronize layer-specific properties if applicable */
|
|
if (surface->layer->index > 0) {
|
|
|
|
/* Synchronize opacity */
|
|
guac_protocol_send_shade(socket, surface->layer, surface->opacity);
|
|
|
|
/* Synchronize location and hierarchy */
|
|
guac_protocol_send_move(socket, surface->layer,
|
|
surface->parent, surface->x, surface->y, surface->z);
|
|
|
|
}
|
|
|
|
/* Sync size to new socket */
|
|
guac_protocol_send_size(socket, surface->layer,
|
|
surface->width, surface->height);
|
|
|
|
/* Send contents of layer, if non-empty */
|
|
if (surface->width > 0 && surface->height > 0) {
|
|
|
|
/* Get entire surface */
|
|
cairo_surface_t* rect = cairo_image_surface_create_for_data(
|
|
surface->buffer, CAIRO_FORMAT_ARGB32,
|
|
surface->width, surface->height, surface->stride);
|
|
|
|
/* Send PNG for rect */
|
|
guac_user_stream_png(user, socket, GUAC_COMP_OVER, surface->layer,
|
|
0, 0, rect);
|
|
cairo_surface_destroy(rect);
|
|
|
|
}
|
|
|
|
complete:
|
|
pthread_mutex_unlock(&surface->_lock);
|
|
|
|
}
|
|
|