Use blend_color_solid as suggested by @jkseppan

mdboom · mdboom · commit 83a10258f6bf · 2015-11-02T12:22:08.000-05:00
diff --git a/src/_backend_agg.h b/src/_backend_agg.h
@@ -789,11 +789,8 @@ inline void RendererAgg::draw_text_image(GCAgg &gc, ImageArray &image, int x, in
         }
 
         for (int yi = text.y1; yi < text.y2; ++yi) {
-            for (int xi = text.x1; xi < text.x2; ++xi) {
-                typename ImageArray::value_type pixel = image(
-                        yi - (y - image.dim(0)), xi - x);
-                pixFmt.blend_pixel(xi, yi, gc.color, pixel);
-            }
+            pixFmt.blend_solid_hspan(text.x1, yi, (text.x2 - text.x1), gc.color,
+                                     &image(yi - (y - image.dim(0)), text.x1 - x));
         }
     }
 }

Original file line number	Diff line number	Diff line change
`@@ -789,11 +789,8 @@ inline void RendererAgg::draw_text_image(GCAgg &gc, ImageArray &image, int x, in`
`789`	`789`	`}`
`790`	`790`
`791`	`791`	`for (int yi = text.y1; yi < text.y2; ++yi) {`
`792`		`- for (int xi = text.x1; xi < text.x2; ++xi) {`
`793`		`- typename ImageArray::value_type pixel = image(`
`794`		`- yi - (y - image.dim(0)), xi - x);`
`795`		`- pixFmt.blend_pixel(xi, yi, gc.color, pixel);`
`796`		`- }`
	`792`	`+ pixFmt.blend_solid_hspan(text.x1, yi, (text.x2 - text.x1), gc.color,`
	`793`	`+ &image(yi - (y - image.dim(0)), text.x1 - x));`
`797`	`794`	`}`
`798`	`795`	`}`
`799`	`796`	`}`