158 lines
4.8 KiB
C
158 lines
4.8 KiB
C
/*
|
|
* Licensed to the Apache Software Foundation (ASF) under one
|
|
* or more contributor license agreements. See the NOTICE file
|
|
* distributed with this work for additional information
|
|
* regarding copyright ownership. The ASF licenses this file
|
|
* to you under the Apache License, Version 2.0 (the
|
|
* "License"); you may not use this file except in compliance
|
|
* with the License. You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing,
|
|
* software distributed under the License is distributed on an
|
|
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
|
|
* KIND, either express or implied. See the License for the
|
|
* specific language governing permissions and limitations
|
|
* under the License.
|
|
*/
|
|
|
|
#include "config.h"
|
|
#include "display.h"
|
|
#include "layer.h"
|
|
|
|
#include <cairo/cairo.h>
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
/**
|
|
* The Guacamole video encoder display related to the current qsort()
|
|
* operation. As qsort() does not provide a means of passing arbitrary data to
|
|
* the comparitor, this value must be set prior to invoking qsort() with
|
|
* guacenc_display_layer_comparator.
|
|
*/
|
|
guacenc_display* __qsort_display;
|
|
|
|
/**
|
|
* Comparator which orders layer pointers such that (1) NULL pointers are last,
|
|
* (2) layers with the same parent_index are adjacent, and (3) layers with the
|
|
* same parent_index are ordered by Z.
|
|
*
|
|
* @see qsort()
|
|
*/
|
|
static int guacenc_display_layer_comparator(const void* a, const void* b) {
|
|
|
|
guacenc_layer* layer_a = *((guacenc_layer**) a);
|
|
guacenc_layer* layer_b = *((guacenc_layer**) b);
|
|
|
|
/* If a is NULL, sort it to bottom */
|
|
if (layer_a == NULL) {
|
|
|
|
/* ... unless b is also NULL, in which case they are equal */
|
|
if (layer_b == NULL)
|
|
return 0;
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* If b is NULL (and a is not NULL), sort it to bottom */
|
|
if (layer_b == NULL)
|
|
return -1;
|
|
|
|
/* Order such that the deepest layers are first */
|
|
int a_depth = guacenc_display_get_depth(__qsort_display, layer_a);
|
|
int b_depth = guacenc_display_get_depth(__qsort_display, layer_b);
|
|
if (b_depth != a_depth)
|
|
return b_depth - a_depth;
|
|
|
|
/* Order such that sibling layers are adjacent */
|
|
if (layer_b->parent_index != layer_a->parent_index)
|
|
return layer_b->parent_index - layer_a->parent_index;
|
|
|
|
/* Order sibling layers according to descending Z */
|
|
return layer_b->z - layer_a->z;
|
|
|
|
}
|
|
|
|
int guacenc_display_flatten(guacenc_display* display) {
|
|
|
|
int i;
|
|
guacenc_layer* render_order[GUACENC_DISPLAY_MAX_LAYERS];
|
|
|
|
/* Copy list of layers within display */
|
|
memcpy(render_order, display->layers, sizeof(render_order));
|
|
|
|
/* Sort layers by depth, parent, and Z */
|
|
__qsort_display = display;
|
|
qsort(render_order, GUACENC_DISPLAY_MAX_LAYERS, sizeof(guacenc_layer*),
|
|
guacenc_display_layer_comparator);
|
|
|
|
/* Reset layer frame buffers */
|
|
for (i = 0; i < GUACENC_DISPLAY_MAX_LAYERS; i++) {
|
|
|
|
/* Pull current layer, ignoring unallocated layers */
|
|
guacenc_layer* layer = render_order[i];
|
|
if (layer == NULL)
|
|
continue;
|
|
|
|
/* Get source buffer and destination frame buffer */
|
|
guacenc_buffer* buffer = layer->buffer;
|
|
guacenc_buffer* frame = layer->frame;
|
|
|
|
/* Reset frame contents */
|
|
guacenc_buffer_copy(frame, buffer);
|
|
|
|
}
|
|
|
|
/* Render each layer, in order */
|
|
for (i = 0; i < GUACENC_DISPLAY_MAX_LAYERS; i++) {
|
|
|
|
/* Pull current layer, ignoring unallocated layers */
|
|
guacenc_layer* layer = render_order[i];
|
|
if (layer == NULL)
|
|
continue;
|
|
|
|
/* Skip fully-transparent layers */
|
|
if (layer->opacity == 0)
|
|
continue;
|
|
|
|
/* Ignore layers without a parent */
|
|
int parent_index = layer->parent_index;
|
|
if (parent_index == GUACENC_LAYER_NO_PARENT)
|
|
continue;
|
|
|
|
/* Retrieve parent layer, ignoring layers with invalid parents */
|
|
guacenc_layer* parent = guacenc_display_get_layer(display, parent_index);
|
|
if (parent == NULL)
|
|
continue;
|
|
|
|
/* Get source and destination frame buffer */
|
|
guacenc_buffer* src = layer->frame;
|
|
guacenc_buffer* dst = parent->frame;
|
|
|
|
/* Ignore layers with empty buffers */
|
|
cairo_surface_t* surface = src->surface;
|
|
if (surface == NULL)
|
|
continue;
|
|
|
|
/* Ignore if parent has no pixels */
|
|
cairo_t* cairo = dst->cairo;
|
|
if (cairo == NULL)
|
|
continue;
|
|
|
|
/* Render buffer to layer */
|
|
cairo_reset_clip(cairo);
|
|
cairo_rectangle(cairo, layer->x, layer->y, src->width, src->height);
|
|
cairo_clip(cairo);
|
|
|
|
cairo_set_source_surface(cairo, surface, layer->x, layer->y);
|
|
cairo_paint_with_alpha(cairo, layer->opacity / 255.0);
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|