gui: make sure that the alpha channel is initialized

For surfaces with less than four channels we weren't
initializing the alpha channel resulting in an image
that had garbage for alpha.

diff --git a/gui/apisurface.cpp b/gui/apisurface.cpp
index 199cd7d3cdb115c884571fb58005150b644ed094..a872c13b6b2270a27eb68685a289b4827d77057c 100644 (file)
--- a/gui/apisurface.cpp
+++ b/gui/apisurface.cpp
@@ -144,7 +144,7 @@ ApiSurface::qimageFromRawImage(const image::Image *image)
         if (image->channelType == image::TYPE_UNORM8) {
             const unsigned char *src = srcRow;
             for (int x = 0; x < width; ++x) {
-                unsigned char rgba[4];
+                unsigned char rgba[4] = {0, 0, 0, 0xff};
                 for (int c = 0; c < image->channels; ++c) {
                     rgba[c] = *src++;
                 }