Two changes:

* Buffer icons are usually in straight space (since we load from pngs)
so use src_alpha in OpenGL for blending.

* Allow blending for preview icons. This will be useful for the next
commit...

2 files changed, 4 insertions, 2 deletions

diff --git a/source/blender/editors/interface/interface_icons.c b/source/blender/editors/interface/interface_icons.c
index f580bd6b5f2..cbbb6a2a255 100644
--- a/source/blender/editors/interface/interface_icons.c
+++ b/source/blender/editors/interface/interface_icons.c
@@ -1137,7 +1137,7 @@ static void icon_draw_size(float x, float y, int icon_id, float aspect, float al
 #endif
 		if (!iimg->rect) return;  /* something has gone wrong! */
 
-		glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 		icon_draw_rect(x, y, w, h, aspect, iimg->w, iimg->h, iimg->rect, alpha, rgb, is_preview);
 		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
 	}
diff --git a/source/blender/editors/interface/interface_widgets.c b/source/blender/editors/interface/interface_widgets.c
index 4d2bd186f56..30db16e0d82 100644
--- a/source/blender/editors/interface/interface_widgets.c
+++ b/source/blender/editors/interface/interface_widgets.c
@@ -851,7 +851,9 @@ static void widget_draw_icon(const uiBut *but, BIFIconID icon, float alpha, cons
 	float aspect, height;
 	
 	if (but->flag & UI_ICON_PREVIEW) {
+		glEnable(GL_BLEND);
 		widget_draw_preview(icon, alpha, rect);
+		glDisable(GL_BLEND);
 		return;
 	}
 	
@@ -3753,6 +3755,7 @@ void ui_draw_preview_item(uiFontStyle *fstyle, rcti *rect, const char *name, int
 	wt->state(wt, state);
 	wt->draw(&wt->wcol, rect, 0, 0);
 	
+	glEnable(GL_BLEND);
 	widget_draw_preview(iconid, 1.0f, rect);
 	
 	BLF_width_and_height(fstyle->uifont_id, name, BLF_DRAW_STR_DUMMY_MAX, &font_dims[0], &font_dims[1]);
@@ -3775,7 +3778,6 @@ void ui_draw_preview_item(uiFontStyle *fstyle, rcti *rect, const char *name, int
 		bg_rect.xmax = rect->xmax - PREVIEW_PAD;
 
 	glColor4ubv((unsigned char *)wt->wcol_theme->inner_sel);
-	glEnable(GL_BLEND);
 	glRecti(bg_rect.xmin, bg_rect.ymin, bg_rect.xmax, bg_rect.ymax);
 	glDisable(GL_BLEND);