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Comment rationale for render buffer dimensions.

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svn path=/trunk/netsurf/; revision=11699
This commit is contained in:
Michael Drake 2011-02-16 14:35:48 +00:00
parent 082b128106
commit 8912285839
1 changed files with 8 additions and 1 deletions
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9
gtk/thumbnail.c
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@ -63,14 +63,20 @@ bool thumbnail_create(hlcache_handle *content, struct bitmap *bitmap,
assert(content);
assert(bitmap);
/* Get details of final thumbnail image */
/* Get details of required final thumbnail image */
pixbuf = gtk_bitmap_get_primary(bitmap);
width = gdk_pixbuf_get_width(pixbuf);
height = gdk_pixbuf_get_height(pixbuf);
depth = (gdk_screen_get_system_visual(gdk_screen_get_default()))->depth;
/* Calculate size of buffer to render the content into */
/* We get the width from the content width, unless it exceeds 1024,
* in which case we use 1024. This means we never create excessively
* large render buffers for huge contents, which would eat memory and
* cripple performance. */
cwidth = min(content_get_width(content), 1024);
/* The height is set in proportion with the width, according to the
* aspect ratio of the required thumbnail. */
cheight = ((cwidth * height) + (width / 2)) / width;
/* Create buffer to render into */
@ -144,3 +150,4 @@ bool thumbnail_create(hlcache_handle *content, struct bitmap *bitmap,
return true;
}