Added support for alpha blending to true type font drawing.

(cherry picked from mainline commit 89a1dcb59be3e531cc0761c32d1aa70e141d4a12)

1 files changed, 7 insertions, 0 deletions

diff --git a/src/gui/truetypefont.cpp b/src/gui/truetypefont.cpp
index 3986cca5..82a22bc2 100644
--- a/src/gui/truetypefont.cpp
+++ b/src/gui/truetypefont.cpp
@@ -130,6 +130,12 @@ void TrueTypeFont::drawString(gcn::Graphics *graphics,
     }
 
     gcn::Color col = g->getColor();
+    float alpha = 1.0f;
+    if (col.a != 255) alpha = col.a / 255.0f;
+    col.a = 255;
+    /* alpha value is ignored at sting generation so it makes no sense to
+     * cache the same text with different alpha values.
+     */
 
     TextChunk chunk(text, col);
 
@@ -157,6 +163,7 @@ void TrueTypeFont::drawString(gcn::Graphics *graphics,
         cache.front().generate(mFont);
     }
 
+    if (alpha != 1.0f) cache.front().img->setAlpha(alpha);
     g->drawImage(cache.front().img, x, y);
 }