guacamole-spice-protocol/src/common/guac_surface.c

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/*
* Copyright (C) 2014 Glyptodon LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "config.h"
#include "guac_surface.h"
#include <cairo/cairo.h>
#include <guacamole/layer.h>
#include <guacamole/protocol.h>
#include <guacamole/socket.h>
#include <stdlib.h>
static int __guac_common_should_combine(guac_common_surface* surface, int x, int y, int w, int h) {
if (surface->dirty) {
int new_pixels, dirty_pixels, update_pixels;
int new_width, new_height;
/* Calculate extents of existing dirty rect */
int dirty_left = surface->dirty_x;
int dirty_top = surface->dirty_y;
int dirty_right = dirty_left + surface->dirty_width;
int dirty_bottom = dirty_top + surface->dirty_height;
/* Calculate missing extents of given new rect */
int right = x + w;
int bottom = y + h;
/* Update minimums */
if (x < dirty_left) dirty_left = x;
if (y < dirty_top) dirty_top = y;
if (right > dirty_right) dirty_right = right;
if (bottom > dirty_bottom) dirty_bottom = bottom;
new_width = dirty_right - dirty_left;
new_height = dirty_bottom - dirty_top;
/* Combine if result is still small */
if (new_width <= 64 && new_height <= 64)
return 1;
new_pixels = new_width*new_height;
dirty_pixels = surface->dirty_width*surface->dirty_height;
update_pixels = w*h;
/* Combine if increase in cost is likely negligible */
if (new_pixels - dirty_pixels <= update_pixels*4) return 1;
if (new_pixels / dirty_pixels <= 2) return 1;
/* Otherwise, do not combine */
return 0;
}
/* Always combine with nothing */
return 1;
}
static void __guac_common_mark_dirty(guac_common_surface* surface, int x, int y, int w, int h) {
/* If already dirty, update existing rect */
if (surface->dirty) {
/* Calculate extents of existing dirty rect */
int dirty_left = surface->dirty_x;
int dirty_top = surface->dirty_y;
int dirty_right = dirty_left + surface->dirty_width;
int dirty_bottom = dirty_top + surface->dirty_height;
/* Calculate missing extents of given new rect */
int right = x + w;
int bottom = y + h;
/* Update minimums */
if (x < dirty_left) dirty_left = x;
if (y < dirty_top) dirty_top = y;
if (right > dirty_right) dirty_right = right;
if (bottom > dirty_bottom) dirty_bottom = bottom;
/* Commit rect */
surface->dirty_x = dirty_left;
surface->dirty_y = dirty_top;
surface->dirty_width = dirty_right - dirty_left;
surface->dirty_height = dirty_bottom - dirty_top;
}
/* Otherwise init dirty rect */
else {
surface->dirty_x = x;
surface->dirty_y = y;
surface->dirty_width = w;
surface->dirty_height = h;
surface->dirty = 1;
}
}
guac_common_surface* guac_common_surface_alloc(guac_socket* socket, const guac_layer* layer, int w, int h) {
/* Init surface */
guac_common_surface* surface = malloc(sizeof(guac_common_surface));
surface->layer = layer;
surface->socket = socket;
surface->width = w;
surface->height = h;
surface->dirty = 0;
/* Create corresponding Cairo surface */
surface->stride = cairo_format_stride_for_width(CAIRO_FORMAT_RGB24, w);
surface->buffer = malloc(surface->stride * h);
surface->surface = cairo_image_surface_create_for_data(surface->buffer, CAIRO_FORMAT_RGB24,
w, h, surface->stride);
guac_protocol_send_size(socket, layer, w, h);
return surface;
}
void guac_common_surface_free(guac_common_surface* surface) {
guac_protocol_send_dispose(surface->socket, surface->layer);
cairo_surface_destroy(surface->surface);
free(surface->buffer);
free(surface);
}
void guac_common_surface_draw(guac_common_surface* surface, int x, int y, cairo_surface_t* src) {
guac_socket* socket = surface->socket;
const guac_layer* layer = surface->layer;
int w = cairo_image_surface_get_width(src);
int h = cairo_image_surface_get_height(src);
/* Flush if not combining */
if (!__guac_common_should_combine(surface, x, y, w, h)) {
guac_protocol_send_log(socket, "Refusing to combine rect (%i, %i) %ix%i", x, y, w, h);
guac_common_surface_flush(surface);
}
/* STUB */
__guac_common_mark_dirty(surface, x, y,
cairo_image_surface_get_width(src),
cairo_image_surface_get_height(src));
guac_protocol_send_png(socket, GUAC_COMP_OVER, layer, x, y, src);
}
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) {
guac_socket* socket = dst->socket;
const guac_layer* src_layer = src->layer;
const guac_layer* dst_layer = dst->layer;
/* Flush if not combining */
if (!__guac_common_should_combine(dst, dx, dy, w, h)) {
guac_protocol_send_log(socket, "Refusing to combine rect (%i, %i) %ix%i", dx, dy, w, h);
guac_common_surface_flush(dst);
}
if (dst->dirty) {
guac_protocol_send_log(socket, "NOTE - would rewrite as PNG instead of sending copy");
__guac_common_mark_dirty(dst, dx, dy, w, h);
}
/* STUB */
guac_common_surface_flush(src);
guac_protocol_send_copy(socket, src_layer, sx, sy, w, h, GUAC_COMP_OVER, dst_layer, dx, dy);
}
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) {
guac_socket* socket = dst->socket;
const guac_layer* src_layer = src->layer;
const guac_layer* dst_layer = dst->layer;
/* Flush if not combining */
if (!__guac_common_should_combine(dst, dx, dy, w, h)) {
guac_protocol_send_log(socket, "Refusing to combine rect (%i, %i) %ix%i", dx, dy, w, h);
guac_common_surface_flush(dst);
}
if (dst->dirty) {
guac_protocol_send_log(socket, "NOTE - would rewrite as PNG instead of sending transfer");
__guac_common_mark_dirty(dst, dx, dy, w, h);
}
/* STUB */
guac_common_surface_flush(src);
guac_protocol_send_transfer(socket, src_layer, sx, sy, w, h, op, dst_layer, dx, dy);
}
void guac_common_surface_rect(guac_common_surface* surface,
int x, int y, int w, int h,
int red, int green, int blue) {
guac_socket* socket = surface->socket;
const guac_layer* layer = surface->layer;
/* Flush if not combining */
if (!__guac_common_should_combine(surface, x, y, w, h)) {
guac_protocol_send_log(socket, "Refusing to combine rect (%i, %i) %ix%i", x, y, w, h);
guac_common_surface_flush(surface);
}
if (surface->dirty) {
guac_protocol_send_log(socket, "NOTE - would rewrite as PNG instead of sending rect+cfill");
__guac_common_mark_dirty(surface, x, y, w, h);
}
/* STUB */
guac_protocol_send_rect(socket, layer, x, y, w, h);
guac_protocol_send_cfill(socket, GUAC_COMP_OVER, layer, red, green, blue, 0xFF);
}
void guac_common_surface_flush(guac_common_surface* surface) {
/* STUB */
if (surface->dirty) {
guac_socket* socket = surface->socket;
guac_protocol_send_log(socket, "Flushing surface %i: (%i, %i) %ix%i",
surface->layer->index,
surface->dirty_x, surface->dirty_y,
surface->dirty_width, surface->dirty_height);
surface->dirty = 0;
}
}