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GUAC-675: Narrow update rect to contain only different pixels.

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This commit is contained in:
Michael Jumper 2014-05-11 00:33:59 -07:00
parent 442a520150
commit a9ba417891
1 changed files with 46 additions and 12 deletions
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58
src/common/guac_surface.c
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@ -414,22 +414,25 @@ static void __guac_common_surface_rect(guac_common_surface* dst, int dx, int dy,
/**
* 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 w The width of the source rectangle.
* @param h The height of the source rectangle.
* @param dst The destination surface.
* @param dx The destination X coordinate.
* @param dy The destination Y coordinate.
* @param w The width of the destination rectangle (same as width of source rect).
* @param h The height of the destination rectangle (same as height of source rect).
* @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, int w, int h,
guac_common_surface* dst, int dx, int dy,
int sx, int sy,
guac_common_surface* dst,
int* dx, int* dy, int* w, int* h,
int opaque) {
unsigned char* dst_buffer = dst->buffer;
@ -437,20 +440,36 @@ static void __guac_common_surface_put(unsigned char* src_buffer, int src_stride,
int x, y;
int min_x = *w - 1;
int min_y = *h - 1;
int max_x = 0;
int max_y = 0;
src_buffer += src_stride*sy + 4*sx;
dst_buffer += dst_stride*dy + 4*dx;
dst_buffer += dst_stride*(*dy) + 4*(*dx);
/* For each row */
for (y=0; y<h; y++) {
for (y=0; y<*h; y++) {
uint32_t* src_current = (uint32_t*) src_buffer;
uint32_t* dst_current = (uint32_t*) dst_buffer;
/* Copy row */
for (x=0; x<w; x++) {
for (x=0; x<*w; x++) {
if (opaque || (*src_current & 0xFF000000))
*dst_current = *src_current | 0xFF000000;
if (opaque || (*src_current & 0xFF000000)) {
uint32_t new_color = *src_current | 0xFF000000;
uint32_t old_color = *dst_current;
if (old_color != new_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 = new_color;
}
}
src_current++;
dst_current++;
@ -462,6 +481,17 @@ static void __guac_common_surface_put(unsigned char* src_buffer, int src_stride,
}
if (max_x >= min_x && max_y >= min_y) {
*dx += min_x;
*dy += min_y;
*w = max_x - min_x + 1;
*h = max_y - min_y + 1;
}
else {
*w = 0;
*h = 0;
}
}
/**
@ -655,10 +685,12 @@ void guac_common_surface_resize(guac_common_surface* surface, int w, int h) {
guac_common_surface_reset_clip(surface);
/* Init with old data */
int x = 0;
int y = 0;
if (old_width > w) old_width = w;
if (old_height > h) old_height = h;
__guac_common_surface_put(old_buffer, old_stride, 0, 0, old_width, old_height,
surface, 0, 0, 1);
__guac_common_surface_put(old_buffer, old_stride, 0, 0,
surface, &x, &y, &old_width, &old_height, 1);
/* Free old data */
free(old_buffer);
@ -712,7 +744,9 @@ void guac_common_surface_draw(guac_common_surface* surface, int x, int y, cairo_
return;
/* Update backing surface */
__guac_common_surface_put(buffer, stride, sx, sy, w, h, surface, x, y, format != CAIRO_FORMAT_ARGB32);
__guac_common_surface_put(buffer, stride, sx, sy, surface, &x, &y, &w, &h, format != CAIRO_FORMAT_ARGB32);
if (w <= 0 || h <= 0)
return;
/* Flush if not combining */
if (!__guac_common_should_combine(surface, x, y, w, h, 0))