From 7178d09630cb4a28cd32bf58c40c0baa9f8948df Mon Sep 17 00:00:00 2001
From: Vadim Lopatin <coolreader.org@gmail.com>
Date: Wed, 16 Dec 2015 15:40:19 +0300
Subject: [PATCH] fix PNG with palette and transparency - close #118

---
 3rdparty/dimage/png.d | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/3rdparty/dimage/png.d b/3rdparty/dimage/png.d
index d5d90448..c87df734 100644
--- a/3rdparty/dimage/png.d
+++ b/3rdparty/dimage/png.d
@@ -365,7 +365,9 @@ Compound!(SuperImage, string) loadPNG(
     
     ubyte[] buffer = zlibDecoder.buffer;
     version(PNGDebug) writefln("buffer.length = %s", buffer.length);
-    
+
+    bool transparencyPalette;
+
     // create image
     if (hdr.colorType == ColorType.Greyscale)
     {
@@ -397,9 +399,10 @@ Compound!(SuperImage, string) loadPNG(
     }
     else if (hdr.colorType == ColorType.Palette)
     {
-        if (transparency.length > 0)
+        if (transparency.length > 0) {
             img = imgFac.createImage(hdr.width, hdr.height, 4, 8);
-        else
+            transparencyPalette = true;
+        } else
             img = imgFac.createImage(hdr.width, hdr.height, 3, 8);
     }
     else
@@ -549,7 +552,7 @@ Compound!(SuperImage, string) loadPNG(
     }
     else if (hdr.colorType == ColorType.Palette)
     {
-        if (transparency.length > 0) {
+        if (transparencyPalette) {
             for (int i = 0; i < img.length; i++) {
                 img.data[i] = ((cast(uint)buffer[bufindex])<<16) | ((cast(uint)buffer[bufindex + 1])<<8) | ((cast(uint)buffer[bufindex + 2])<<0) | ((cast(uint)buffer[bufindex + 3])<<24);
                 bufindex += 4;