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Fix rendering of theme parts on Windows XP

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It seems XP doesn't handle drawing non-alpha theme parts
on alpha destinations. We fix this by using alpha bitmaps only when
needed.

However this means any non-drawn area by the theme part is now draw
black, so we must take more care to only draw where the theme part draws,
so we find the theme part size when available.
This commit is contained in:
Alexander Larsson
2012-03-09 16:37:11 +01:00
parent 114b45c7eb
commit f4a68dff88
3 changed files with 58 additions and 13 deletions
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12
gtk/gtkcssimagewin32.c
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@ -33,21 +33,23 @@ gtk_css_image_win32_draw (GtkCssImage *image,
{
GtkCssImageWin32 *wimage = GTK_CSS_IMAGE_WIN32 (image);
cairo_surface_t *surface;
int dx, dy;
surface = _gtk_win32_theme_part_create_surface (wimage->theme, wimage->part, wimage->state, wimage->margins,
width, height);
width, height, &dx, &dy);
if (wimage->state2 >= 0)
{
cairo_surface_t *surface2;
cairo_t *cr;
int dx2, dy2;
surface2 = _gtk_win32_theme_part_create_surface (wimage->theme, wimage->part2, wimage->state2, wimage->margins,
width, height);
width, height, &dx2, &dy2);
cr = cairo_create (surface);
cairo_set_source_surface (cr, surface2, 0, 0);
cairo_set_source_surface (cr, surface2, dx2 - dx, dy2-dy);
cairo_paint_with_alpha (cr, wimage->over_alpha);
cairo_destroy (cr);
@ -55,8 +57,8 @@ gtk_css_image_win32_draw (GtkCssImage *image,
cairo_surface_destroy (surface2);
}
cairo_set_source_surface (cr, surface, 0, 0);
cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_PAD);
cairo_set_source_surface (cr, surface, dx, dy);
cairo_pattern_set_extend (cairo_get_source (cr), CAIRO_EXTEND_NONE);
cairo_rectangle (cr, 0, 0, width, height);
cairo_fill (cr);