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clutter/stage-cogl: Add function to scale and clamp fractional values to pixels

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Compute pixels rectangles using various clutter utility functions that take
care of the subpixel compensation.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/3
This commit is contained in:
Marco Trevisan (Treviño) 2019-03-01 03:49:33 +01:00
parent 3d89b47757
commit cbd3ad8585
1 changed files with 54 additions and 32 deletions
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86
clutter/clutter/cogl/clutter-stage-cogl.c
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@ -575,6 +575,18 @@ is_buffer_age_enabled (void)
cogl_clutter_winsys_has_feature (COGL_WINSYS_FEATURE_BUFFER_AGE);
}
static void
scale_and_clamp_rect (const ClutterRect *rect,
float scale,
cairo_rectangle_int_t *dest)
{
ClutterRect tmp = *rect;
clutter_rect_scale (&tmp, scale, scale);
_clutter_util_rectangle_int_extents (&tmp, dest);
}
static gboolean
clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
ClutterStageView *view)
@ -638,21 +650,22 @@ clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
* frames when starting up... */
cogl_onscreen_get_frame_counter (COGL_ONSCREEN (fb)) > 3)
{
ClutterRect rect;
may_use_clipped_redraw = TRUE;
if (fb_scale != floorf (fb_scale))
subpixel_compensation = ceilf (fb_scale);
_clutter_util_rect_from_rectangle (&redraw_clip, &rect);
clutter_rect_offset (&rect, -view_rect.x, -view_rect.y);
scale_and_clamp_rect (&rect, fb_scale, &fb_clip_region);
fb_clip_region = (cairo_rectangle_int_t) {
.x = (floorf ((redraw_clip.x - view_rect.x) * fb_scale) -
subpixel_compensation),
.y = (floorf ((redraw_clip.y - view_rect.y) * fb_scale) -
subpixel_compensation),
.width = (ceilf (redraw_clip.width * fb_scale) +
(2 * subpixel_compensation)),
.height = (ceilf (redraw_clip.height * fb_scale) +
(2 * subpixel_compensation))
};
if (fb_scale != floorf (fb_scale))
{
subpixel_compensation = ceilf (fb_scale);
fb_clip_region.x -= subpixel_compensation;
fb_clip_region.y -= subpixel_compensation;
fb_clip_region.width += 2 * subpixel_compensation;
fb_clip_region.height += 2 * subpixel_compensation;
}
}
else
{
@ -680,6 +693,7 @@ clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
if (valid_buffer_age (view_cogl, age))
{
ClutterRect rect;
cairo_rectangle_int_t damage_region;
*current_fb_damage = fb_clip_region;
@ -695,12 +709,12 @@ clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
}
/* Update the bounding redraw clip state with the extra damage. */
damage_region = (cairo_rectangle_int_t) {
.x = view_rect.x + floorf (fb_clip_region.x / fb_scale),
.y = view_rect.y + floorf (fb_clip_region.y / fb_scale),
.width = ceilf (fb_clip_region.width / fb_scale),
.height = ceilf (fb_clip_region.height / fb_scale)
};
_clutter_util_rect_from_rectangle (&fb_clip_region, &rect);
scale_and_clamp_rect (&rect, 1.0f / fb_scale, &damage_region);
_clutter_util_rectangle_offset (&damage_region,
view_rect.x,
view_rect.y,
&damage_region);
_clutter_util_rectangle_union (&stage_cogl->bounding_redraw_clip,
&damage_region,
&stage_cogl->bounding_redraw_clip);
@ -739,7 +753,9 @@ clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
}
else if (use_clipped_redraw)
{
ClutterRect rect;
cairo_rectangle_int_t scissor_rect;
cairo_rectangle_int_t paint_rect;
calculate_scissor_region (&fb_clip_region,
subpixel_compensation,
@ -760,13 +776,15 @@ clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
scissor_rect.y,
scissor_rect.width,
scissor_rect.height);
paint_stage (stage_cogl, view,
&(cairo_rectangle_int_t) {
.x = view_rect.x + floorf ((fb_clip_region.x - 0) / fb_scale),
.y = view_rect.y + floorf ((fb_clip_region.y - 0) / fb_scale),
.width = ceilf ((fb_clip_region.width + 0) / fb_scale),
.height = ceilf ((fb_clip_region.height + 0) / fb_scale)
});
_clutter_util_rect_from_rectangle (&fb_clip_region, &rect);
scale_and_clamp_rect (&rect, 1.0f / fb_scale, &paint_rect);
_clutter_util_rectangle_offset (&paint_rect,
view_rect.x,
view_rect.y,
&paint_rect);
paint_stage (stage_cogl, view, &paint_rect);
cogl_framebuffer_pop_clip (fb);
stage_cogl->using_clipped_redraw = FALSE;
@ -781,7 +799,9 @@ clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
may_use_clipped_redraw &&
!clip_region_empty)
{
ClutterRect rect;
cairo_rectangle_int_t scissor_rect;
cairo_rectangle_int_t paint_rect;
calculate_scissor_region (&fb_clip_region,
subpixel_compensation,
@ -793,13 +813,15 @@ clutter_stage_cogl_redraw_view (ClutterStageWindow *stage_window,
scissor_rect.y,
scissor_rect.width,
scissor_rect.height);
paint_stage (stage_cogl, view,
&(cairo_rectangle_int_t) {
.x = view_rect.x + floorf (fb_clip_region.x / fb_scale),
.y = view_rect.y + floorf (fb_clip_region.y / fb_scale),
.width = ceilf (fb_clip_region.width / fb_scale),
.height = ceilf (fb_clip_region.height / fb_scale)
});
_clutter_util_rect_from_rectangle (&fb_clip_region, &rect);
scale_and_clamp_rect (&rect, 1.0f / fb_scale, &paint_rect);
_clutter_util_rectangle_offset (&paint_rect,
view_rect.x,
view_rect.y,
&paint_rect);
paint_stage (stage_cogl, view, &paint_rect);
cogl_framebuffer_pop_clip (fb);
}
else