Added sRGB (gamma-correct) support for Images, Canvases, and the main screen.

love.graphics.newImage(path, “srgb”) creates a new Image whose texels are treated as being in the sRGB color space, so they are linearized when drawing/sampling from the image.

love.graphics.newCanvas(w, h, “srgb”) creates a new Canvas whose texels are treated as being in the sRGB color space, so drawing to the Canvas does a linear->sRGB conversion (but blends linearly), and sampling from it (drawing it or using it in a shader) converts from sRGB to linear space.

The "srgb" window flag does the same as Canvases for the main screen.

src/modules/graphics/Texture.cpp

@@ -109,6 +109,16 @@ bool Texture::getConstant(WrapMode in, const char  *&out)
 	return wrapModes.find(in, out);
 }
 
+bool Texture::getConstant(const char *in, Format &out)
+{
+	return formats.find(in, out);
+}
+
+bool Texture::getConstant(Format in, const char *&out)
+{
+	return formats.find(in, out);
+}
+
 StringMap<Texture::FilterMode, Texture::FILTER_MAX_ENUM>::Entry Texture::filterModeEntries[] =
 {
 	{ "linear", Texture::FILTER_LINEAR },
@@ -125,6 +135,15 @@ StringMap<Texture::WrapMode, Texture::WRAP_MAX_ENUM>::Entry Texture::wrapModeEnt
 
 StringMap<Texture::WrapMode, Texture::WRAP_MAX_ENUM> Texture::wrapModes(Texture::wrapModeEntries, sizeof(Texture::wrapModeEntries));
 
+StringMap<Texture::Format, Texture::FORMAT_MAX_ENUM>::Entry Texture::formatEntries[] =
+{
+	{"normal", Texture::FORMAT_NORMAL},
+	{"hdr", Texture::FORMAT_HDR},
+	{"srgb", Texture::FORMAT_SRGB},
+};
+
+StringMap<Texture::Format, Texture::FORMAT_MAX_ENUM> Texture::formats(Texture::formatEntries, sizeof(Texture::formatEntries));
+
 
 } // graphics
 } // love