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authorAndrei Karas <akaras@inbox.ru>2016-09-23 22:01:44 +0300
committerAndrei Karas <akaras@inbox.ru>2016-09-23 22:01:44 +0300
commit3c404128c4669a1f4f190e20a89553677717fc50 (patch)
tree2db4e5031089c800c4e00fd6244e578f44a7c910 /src/utils/sdlpixel.h
parent89b267d6d73bbc59f7c313b8a22b97fbb27f99a8 (diff)
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Add missing comments into defines.
Diffstat (limited to 'src/utils/sdlpixel.h')
-rw-r--r--src/utils/sdlpixel.h16
1 files changed, 12 insertions, 4 deletions
diff --git a/src/utils/sdlpixel.h b/src/utils/sdlpixel.h
index 66f4c2862..231959c80 100644
--- a/src/utils/sdlpixel.h
+++ b/src/utils/sdlpixel.h
@@ -68,6 +68,10 @@
#include <SDL.h>
+#ifndef SDL_BYTEORDER
+#error missing SDL_endian.h
+#endif // SDL_BYTEORDER
+
/**
* Puts a pixel on an SDL_Surface.
*
@@ -107,11 +111,13 @@ inline void SDLputPixel(SDL_Surface* surface, int x, int y,
p[0] = CAST_U8((pixel >> 16) & 0xff);
p[1] = CAST_U8((pixel >> 8) & 0xff);
p[2] = CAST_U8((pixel) & 0xff);
-#else
+#else // SDL_BYTEORDER == SDL_BIG_ENDIAN
+
p[0] = CAST_U8((pixel) & 0xff);
p[1] = CAST_U8((pixel >> 8) & 0xff);
p[2] = CAST_U8((pixel >> 16) & 0xff);
-#endif
+#endif // SDL_BYTEORDER == SDL_BIG_ENDIAN
+
break;
case 4:
@@ -218,14 +224,16 @@ inline void SDLputPixelAlpha(SDL_Surface* surface, int x, int y,
+ color.g * color.a) >> 8);
p[0] = CAST_U8((p[0] * (255 - color.a)
+ color.r * color.a) >> 8);
-#else
+#else // SDL_BYTEORDER == SDL_BIG_ENDIAN
+
p[0] = CAST_U8((p[0] * (255 - color.a)
+ color.b * color.a) >> 8);
p[1] = CAST_U8((p[1] * (255 - color.a)
+ color.g * color.a) >> 8);
p[2] = CAST_U8((p[2] * (255 - color.a)
+ color.r * color.a) >> 8);
-#endif
+#endif // SDL_BYTEORDER == SDL_BIG_ENDIAN
+
break;
case 4: