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GtkCssImageSurface: add cache for the last drawn size.

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Keep a copy of the scaled image to speed up rendering multiple times
the image at the same size.
This commit is contained in:
Juan Pablo Ugarte 2017-12-29 15:21:52 -03:00 committed by Juan Pablo Ugarte
parent 8ed4b48b4c
commit 2a8e1745cf
2 changed files with 34 additions and 6 deletions
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37
gtk/gtkcssimagesurface.c
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@ -20,6 +20,7 @@
#include "config.h"
#include "gtkcssimagesurfaceprivate.h"
#include <math.h>
G_DEFINE_TYPE (GtkCssImageSurface, _gtk_css_image_surface, GTK_TYPE_CSS_IMAGE)
@ -51,15 +52,39 @@ gtk_css_image_surface_draw (GtkCssImage *image,
image_width = cairo_image_surface_get_width (surface->surface);
image_height = cairo_image_surface_get_height (surface->surface);
if (image_width == 0 || image_height == 0)
if (image_width == 0 || image_height == 0 || width <= 0 || height <= 0)
return;
/* Update cache image if size is different */
if (surface->cache == NULL ||
ABS (width - surface->width) > 0.001 ||
ABS (height - surface->height) > 0.001)
{
cairo_t *cache;
/* Save original size to preserve precision */
surface->width = width;
surface->height = height;
/* Destroy old cache if any */
g_clear_pointer (&surface->cache, cairo_surface_destroy);
/* Image big enough to contain scaled image with subpixel precision */
surface->cache = cairo_surface_create_similar_image (surface->surface,
CAIRO_FORMAT_ARGB32,
ceil (width),
ceil (height));
cache = cairo_create (surface->cache);
cairo_rectangle (cache, 0, 0, width, height);
cairo_scale (cache, width / image_width, height / image_height);
cairo_set_source_surface (cache, surface->surface, 0, 0);
cairo_fill (cache);
cairo_destroy (cache);
}
cairo_rectangle (cr, 0, 0, width, height);
cairo_scale (cr,
width / image_width,
height / image_height);
cairo_set_source_surface (cr, surface->surface, 0, 0);
cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_PAD);
cairo_set_source_surface (cr, surface->cache ? surface->cache : surface->surface, 0, 0);
cairo_fill (cr);
}

3
gtk/gtkcssimagesurfaceprivate.h
View File

@ -39,6 +39,9 @@ struct _GtkCssImageSurface
GtkCssImage parent;
cairo_surface_t *surface; /* the surface we render - guaranteed to be an image surface */
cairo_surface_t *cache; /* the scaled surface - to avoid scaling every time we need to draw */
double width; /* original cache width */
double height; /* original cache height */
};
struct _GtkCssImageSurfaceClass