X-Git-Url: http://git.tdb.fi/?p=libs%2Fgl.git;a=blobdiff_plain;f=source%2Fcore%2Fpixelformat.cpp;h=6e7621882fef8eae4e595cd07e004a34b8e567bf;hp=81379ef07062831a85fed2ee8fa1f925f34b450a;hb=HEAD;hpb=160e9eea29bd10034733d59507fa1bcca36be401

diff --git a/source/core/pixelformat.cpp b/source/core/pixelformat.cpp
index 81379ef0..6e762188 100644
--- a/source/core/pixelformat.cpp
+++ b/source/core/pixelformat.cpp
@@ -98,6 +98,46 @@ PixelComponents components_from_graphics(Graphics::PixelFormat pf)
 	}
 }
 
+PixelComponents swizzle_components(PixelComponents comp, ComponentSwizzle swiz)
+{
+	if(swiz==NO_SWIZZLE)
+		return comp;
+	else if(comp==RED && swiz==R_TO_LUMINANCE)
+		return LUMINANCE;
+	else if(comp==RG && swiz==RG_TO_LUMINANCE_ALPHA)
+		return LUMINANCE_ALPHA;
+	else if(comp==RGB && swiz==RGB_TO_BGR)
+		return BGR;
+	else if(comp==RGBA && swiz==RGB_TO_BGR)
+		return BGRA;
+	else if(comp==RGBA && swiz==RGBA_TO_RGB)
+		return RGB;
+	else if(comp==BGRA && swiz==RGBA_TO_RGB)
+		return BGR;
+	else
+		throw invalid_argument("swizzle_components");
+}
+
+PixelComponents unswizzle_components(PixelComponents comp, ComponentSwizzle swiz)
+{
+	if(swiz==NO_SWIZZLE)
+		return comp;
+	else if(comp==LUMINANCE && swiz==R_TO_LUMINANCE)
+		return RED;
+	else if(comp==LUMINANCE_ALPHA && swiz==RG_TO_LUMINANCE_ALPHA)
+		return RG;
+	else if(comp==BGR && swiz==RGB_TO_BGR)
+		return RGB;
+	else if(comp==BGRA && swiz==RGB_TO_BGR)
+		return RGBA;
+	else if(comp==RGB && swiz==RGBA_TO_RGB)
+		return RGBA;
+	else if(comp==BGR && swiz==RGBA_TO_RGB)
+		return BGRA;
+	else
+		throw invalid_argument("swizzle_components");
+}
+
 PixelFormat pixelformat_from_image(const Graphics::Image &image, bool srgb)
 {
 	PixelComponents comp = components_from_graphics(image.get_format());