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pixel-buffer: add ability track opaqueness

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Pixel buffers contain ARGB32 data. Add functionality to mark a buffer as
containing only fully opaque pixels. This functionality can be used by
rendering functions to be able to optimize drawing of such buffers.

https://bugs.freedesktop.org/show_bug.cgi?id=87105
This commit is contained in:
Sjoerd Simons 2014-12-08 11:39:39 +01:00 • committed by Ray Strode
parent 4ecd0c2436
commit 00ee03695c
2 changed files with 31 additions and 0 deletions
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27
src/libply-splash-core/ply-pixel-buffer.c
View file

@ -37,6 +37,8 @@
#include <stdlib.h>
#include <unistd.h>
#define ALPHA_MASK 0xff000000
struct _ply_pixel_buffer
{
uint32_t *bytes;
@ -45,6 +47,7 @@ struct _ply_pixel_buffer
ply_list_t *clip_areas;
ply_region_t *updated_areas;
uint32_t is_opaque : 1;
};
static inline void ply_pixel_buffer_blend_value_at_pixel (ply_pixel_buffer_t *buffer,
@ -198,6 +201,14 @@ ply_pixel_buffer_fill_area_with_pixel_value (ply_pixel_buffer_t *buffer,
ply_pixel_buffer_crop_area_to_clip_area (buffer, fill_area, &cropped_area);
/* If we're filling the entire buffer with a fully opaque color,
* then make note of it
*/
if (fill_area == &buffer->area &&
(pixel_value >> 24) == 0xff) {
buffer->is_opaque = true;
}
for (row = cropped_area.y; row < cropped_area.y + cropped_area.height; row++) {
for (column = cropped_area.x; column < cropped_area.x + cropped_area.width; column++) {
ply_pixel_buffer_blend_value_at_pixel (buffer,
@ -244,6 +255,7 @@ ply_pixel_buffer_new (unsigned long width,
buffer->clip_areas = ply_list_new ();
ply_pixel_buffer_push_clip_area (buffer, &buffer->area);
buffer->is_opaque = false;
return buffer;
}
@ -295,6 +307,21 @@ ply_pixel_buffer_get_height (ply_pixel_buffer_t *buffer)
return buffer->area.height;
}
bool
ply_pixel_buffer_is_opaque (ply_pixel_buffer_t *buffer)
{
assert (buffer != NULL);
return buffer->is_opaque;
}
void
ply_pixel_buffer_set_opaque (ply_pixel_buffer_t *buffer,
bool is_opaque)
{
assert (buffer != NULL);
buffer->is_opaque = is_opaque;
}
ply_region_t *
ply_pixel_buffer_get_updated_areas (ply_pixel_buffer_t *buffer)
{

4
src/libply-splash-core/ply-pixel-buffer.h
View file

@ -47,6 +47,10 @@ void ply_pixel_buffer_get_size (ply_pixel_buffer_t *buffer,
unsigned long ply_pixel_buffer_get_width (ply_pixel_buffer_t *buffer);
unsigned long ply_pixel_buffer_get_height (ply_pixel_buffer_t *buffer);
bool ply_pixel_buffer_is_opaque (ply_pixel_buffer_t *buffer);
void ply_pixel_buffer_set_opaque (ply_pixel_buffer_t *buffer,
bool is_opaque);
ply_region_t *ply_pixel_buffer_get_updated_areas (ply_pixel_buffer_t *buffer);
void ply_pixel_buffer_fill_with_color (ply_pixel_buffer_t *buffer,