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pixelcache: check whether cached surface and cairo_t scales match

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This commit is contained in:
Carlos Garnacho 2013-12-11 15:41:08 +01:00
parent 695b979b10
commit 15d7d5b31f
1 changed files with 14 additions and 1 deletions
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15
gtk/gtkpixelcache.c
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@ -396,6 +396,19 @@ blow_cache_cb (gpointer user_data)
return G_SOURCE_REMOVE;
}
static gboolean
context_is_unscaled (cairo_t *cr)
{
cairo_matrix_t matrix;
gdouble x, y;
x = y = 1;
cairo_get_matrix (cr, &matrix);
cairo_matrix_transform_distance (&matrix, &x, &y);
return x == 1 && y == 1;
}
void
_gtk_pixel_cache_draw (GtkPixelCache *cache,
@ -420,7 +433,7 @@ _gtk_pixel_cache_draw (GtkPixelCache *cache,
_gtk_pixel_cache_set_position (cache, view_rect, canvas_rect);
_gtk_pixel_cache_repaint (cache, draw, view_rect, canvas_rect, user_data);
if (cache->surface &&
if (cache->surface && context_is_unscaled (cr) &&
/* Don't use backing surface if rendering elsewhere */
cairo_surface_get_type (cache->surface) == cairo_surface_get_type (cairo_get_target (cr)))
{