X-Git-Url: https://git.sesse.net/?p=movit;a=blobdiff_plain;f=flat_input.h;h=87a0d5e8ce8f3b0a6134366ddf548395497e96f6;hp=8b5a3ce4c07d004368063634014b9c88087cd3fc;hb=207384d5c7b8ce40e57decb0160c91da70d54ee6;hpb=38fca90c6ffde05e3459c7021e823cef0b3b27ac

diff --git a/flat_input.h b/flat_input.h
index 8b5a3ce..87a0d5e 100644
--- a/flat_input.h
+++ b/flat_input.h
@@ -1,6 +1,8 @@
 #ifndef _FLAT_INPUT_H
 #define _FLAT_INPUT_H 1
 
+#include <assert.h>
+
 #include "input.h"
 #include "init.h"
 
@@ -24,6 +26,22 @@ public:
 		        (image_format.gamma_curve == GAMMA_LINEAR ||
 		         image_format.gamma_curve == GAMMA_sRGB));
 	}
+	virtual AlphaHandling alpha_handling() const {
+		switch (pixel_format) {
+		case FORMAT_RGBA_PREMULTIPLIED_ALPHA:
+		case FORMAT_BGRA_PREMULTIPLIED_ALPHA:
+			return INPUT_AND_OUTPUT_ALPHA_PREMULTIPLIED;
+		case FORMAT_RGBA_POSTMULTIPLIED_ALPHA:
+		case FORMAT_BGRA_POSTMULTIPLIED_ALPHA:
+			return OUTPUT_ALPHA_POSTMULTIPLIED;
+		case FORMAT_RGB:
+		case FORMAT_BGR:
+		case FORMAT_GRAYSCALE:
+			return OUTPUT_BLANK_ALPHA;
+		default:
+			assert(false);
+		}
+	}
 
 	std::string output_fragment_shader();