Don't rescale thumbnails in sRGB

pixman is too slow at this, maybe do it later, and optionally.

fastiv-browser.c

@@ -225,12 +225,14 @@ rescale_thumbnail(cairo_surface_t *thumbnail)
 	struct pixman_f_transform xform_floating;
 	struct pixman_transform xform;
 
-	pixman_image_t *src = pixman_image_create_bits(
-		PIXMAN_a8r8g8b8_sRGB, width, height,
+	// PIXMAN_a8r8g8b8_sRGB can be used for gamma-correct results,
+	// but it's an incredibly slow transformation
+	pixman_format_code_t format = PIXMAN_a8r8g8b8;
+
+	pixman_image_t *src = pixman_image_create_bits(format, width, height,
 		(uint32_t *) cairo_image_surface_get_data(thumbnail),
 		cairo_image_surface_get_stride(thumbnail));
-	pixman_image_t *dest = pixman_image_create_bits(
-		PIXMAN_a8r8g8b8_sRGB,
+	pixman_image_t *dest = pixman_image_create_bits(format,
 		cairo_image_surface_get_width(scaled),
 		cairo_image_surface_get_height(scaled),
 		(uint32_t *) cairo_image_surface_get_data(scaled),

fastiv-view.c

@@ -135,8 +135,10 @@ fastiv_view_draw(GtkWidget *widget, cairo_t *cr)
 	cairo_set_source_surface(
 		cr, self->surface, x / self->scale, y / self->scale);
 
+	cairo_pattern_t *pattern = cairo_get_source(cr);
+	cairo_pattern_set_extend(pattern, CAIRO_EXTEND_PAD);
 	// TODO(p): Prescale it ourselves to an off-screen bitmap, gamma-correctly.
-	cairo_pattern_set_filter(cairo_get_source(cr), CAIRO_FILTER_GOOD);
+	cairo_pattern_set_filter(pattern, CAIRO_FILTER_GOOD);
 
 	cairo_paint(cr);
 	return TRUE;