From c450854165a9c26d6ab982b09e23ac6d53496599 Mon Sep 17 00:00:00 2001
From: Eugene Sandulenko
Date: Tue, 1 Jan 2019 13:24:54 +0100
Subject: GRAPHICS: Added setAlpha() method to TransparentSurface

---
 graphics/transparent_surface.cpp | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

(limited to 'graphics/transparent_surface.cpp')

diff --git a/graphics/transparent_surface.cpp b/graphics/transparent_surface.cpp
index b4d73d1078..a24f7198aa 100644
--- a/graphics/transparent_surface.cpp
+++ b/graphics/transparent_surface.cpp
@@ -716,6 +716,23 @@ 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
+ */
+void TransparentSurface::setAlpha(uint8 alpha) {
+	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;
+			((uint32 *)pixels)[i * w + j] = format.ARGBToColor(a, r, g, b);
+		}
+	}
+}
+
 AlphaType TransparentSurface::getAlphaMode() const {
 	return _alphaMode;
 }
-- 
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