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Avoid large amount of scaling for pages at low zoom level

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This commit is contained in:
Lingzhu Xiang 2014-10-28 03:46:20 -04:00
parent b0c068f3cb
commit 757f3d8257
1 changed files with 5 additions and 3 deletions
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8
page-widget.c
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@ -580,7 +580,7 @@ zathura_page_widget_redraw_canvas(ZathuraPage* pageview)
}
/* high enough but not causing noticable delay in scaling */
#define THUMBNAIL_MAX_SIZE (8*1024*1024)
#define THUMBNAIL_MAX_SIZE (4*1024*1024)
/* smaller than max to be replaced by actual renders */
#define THUMBNAIL_INITIAL_SIZE (THUMBNAIL_MAX_SIZE/4)
/* small enough to make bilinear downscaling fast */
@ -594,14 +594,16 @@ surface_small_enough(cairo_surface_t* surface, cairo_surface_t* old)
const unsigned int width = cairo_image_surface_get_width(surface);
const unsigned int height = cairo_image_surface_get_height(surface);
if (width * height > THUMBNAIL_MAX_SIZE) {
const size_t new_size = width * height;
if (new_size > THUMBNAIL_MAX_SIZE) {
return false;
}
if (old != NULL) {
const unsigned int width_old = cairo_image_surface_get_width(old);
const unsigned int height_old = cairo_image_surface_get_height(old);
if (width * height < width_old * height_old) {
const size_t old_size = width_old * height_old;
if (new_size < old_size && new_size >= old_size * THUMBNAIL_MAX_SCALE * THUMBNAIL_MAX_SCALE) {
return false;
}
}