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-rw-r--r--graphics/transparent_surface.cpp6
-rw-r--r--graphics/transparent_surface.h2
2 files changed, 5 insertions, 3 deletions
diff --git a/graphics/transparent_surface.cpp b/graphics/transparent_surface.cpp
index a24f7198aa..eb8d3fe5ce 100644
--- a/graphics/transparent_surface.cpp
+++ b/graphics/transparent_surface.cpp
@@ -719,15 +719,17 @@ void TransparentSurface::applyColorKey(uint8 rKey, uint8 gKey, uint8 bKey, bool
/**
* Sets alpha channel for all pixels to specified value
* @param alpha value of the alpha channel to set
+ * @param skipTransparent if set to true, then do not touch pixels with alpha=0
*/
-void TransparentSurface::setAlpha(uint8 alpha) {
+void TransparentSurface::setAlpha(uint8 alpha, bool skipTransparent) {
assert(format.bytesPerPixel == 4);
for (int i = 0; i < h; i++) {
for (int j = 0; j < w; j++) {
uint32 pix = ((uint32 *)pixels)[i * w + j];
uint8 r, g, b, a;
format.colorToARGB(pix, a, r, g, b);
- a = alpha;
+ if (!skipTransparent || a)
+ a = alpha;
((uint32 *)pixels)[i * w + j] = format.ARGBToColor(a, r, g, b);
}
}
diff --git a/graphics/transparent_surface.h b/graphics/transparent_surface.h
index 0738c90f90..8f4493679b 100644
--- a/graphics/transparent_surface.h
+++ b/graphics/transparent_surface.h
@@ -137,7 +137,7 @@ struct TransparentSurface : public Graphics::Surface {
TSpriteBlendMode blend = BLEND_NORMAL);
void applyColorKey(uint8 r, uint8 g, uint8 b, bool overwriteAlpha = false);
- void setAlpha(uint8 alpha);
+ void setAlpha(uint8 alpha, bool skipTransparent = false);
/**
* @brief Scale function; this returns a transformed version of this surface after rotation and