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rendernode: Add diffing for affine transforms

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This will be needed most importantly for inverted textures,
like in GLArea.
This commit is contained in:
Benjamin Otte
2023-04-28 04:28:23 +02:00
parent 11aaa29a69
commit 3198330188
1 changed files with 32 additions and 1 deletions
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33
gsk/gskrendernodeimpl.c
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@@ -32,6 +32,7 @@
#include "gdk/gdktextureprivate.h"
#include "gdk/gdkmemoryformatprivate.h"
#include "gdk/gdkprivate.h"
#include "gdk/gdkrectangleprivate.h"
#include <cairo.h>
#ifdef CAIRO_HAS_SVG_SURFACE
@@ -74,6 +75,25 @@ _graphene_rect_init_from_clip_extents (graphene_rect_t *rect,
graphene_rect_init (rect, x1c, y1c, x2c - x1c, y2c - y1c);
}
static void
region_union_region_affine (cairo_region_t *region,
const cairo_region_t *sub,
float scale_x,
float scale_y,
float offset_x,
float offset_y)
{
cairo_rectangle_int_t rect;
int i;
for (i = 0; i < cairo_region_num_rectangles (sub); i++)
{
cairo_region_get_rectangle (sub, i, &rect);
gdk_rectangle_transform_affine (&rect, scale_x, scale_y, offset_x, offset_y, &rect);
cairo_region_union_rectangle (region, &rect);
}
}
/* {{{ GSK_COLOR_NODE */
/**
@@ -3354,11 +3374,22 @@ gsk_transform_node_diff (GskRenderNode *node1,
}
break;
case GSK_TRANSFORM_CATEGORY_2D_AFFINE:
{
cairo_region_t *sub;
float scale_x, scale_y, dx, dy;
gsk_transform_to_affine (self1->transform, &scale_x, &scale_y, &dx, &dy);
sub = cairo_region_create ();
gsk_render_node_diff (self1->child, self2->child, sub);
region_union_region_affine (region, sub, scale_x, scale_y, dx, dy);
cairo_region_destroy (sub);
}
break;
case GSK_TRANSFORM_CATEGORY_UNKNOWN:
case GSK_TRANSFORM_CATEGORY_ANY:
case GSK_TRANSFORM_CATEGORY_3D:
case GSK_TRANSFORM_CATEGORY_2D:
case GSK_TRANSFORM_CATEGORY_2D_AFFINE:
default:
gsk_render_node_diff_impossible (node1, node2, region);
break;