ImageData: limited support for integer pixel formats.

For now this doesn't support conversions (get/set/mapPixel, etc). Just the ability for ImageData to contain integer pixel contents, for example via Canvas:newImageData.

src/common/pixelformat.cpp

@@ -240,11 +240,23 @@ const PixelFormatInfo &getPixelFormatInfo(PixelFormat format)
 	return formatInfo[format];
 }
 
+const char *getPixelFormatName(PixelFormat format)
+{
+	const char *name = "unknown";
+	getConstant(format, name);
+	return name;
+}
+
 bool isPixelFormatCompressed(PixelFormat format)
 {
 	return formatInfo[format].compressed;
 }
 
+bool isPixelFormatColor(PixelFormat format)
+{
+	return formatInfo[format].color;
+}
+
 bool isPixelFormatDepthStencil(PixelFormat format)
 {
 	const PixelFormatInfo &info = formatInfo[format];

src/common/pixelformat.h

@@ -157,11 +157,21 @@ bool getConstant(const char *in, PixelFormat &out);
 
 const PixelFormatInfo &getPixelFormatInfo(PixelFormat format);
 
+/**
+ * Gets the name of the specified pixel format.
+ **/
+const char *getPixelFormatName(PixelFormat format);
+
 /**
  * Gets whether the specified pixel format is a compressed type.
  **/
 bool isPixelFormatCompressed(PixelFormat format);
 
+/**
+ * Gets whether the specified pixel format is a color type.
+ **/
+bool isPixelFormatColor(PixelFormat format);
+
 /**
  * Gets whether the specified pixel format is a depth or stencil type.
  **/