Added A8 pixel format

PixelFormat::GetBytesPerPixel() will no longer warn with
less-than-one-byte formats

Former-commit-id: af41f0c2bc7a35c2ee617980878628ff1c8bf868

include/Nazara/Utility/Enums.hpp

@@ -130,6 +130,7 @@ enum nzPixelFormat
 {
 	nzPixelFormat_Undefined = -1,
 
+	nzPixelFormat_A8,              // 1*uint8
 	nzPixelFormat_BGR8,            // 3*uint8
 	nzPixelFormat_BGRA8,           // 4*uint8
 	nzPixelFormat_DXT1,

include/Nazara/Utility/PixelFormat.inl

@@ -168,6 +168,9 @@ inline nzUInt8 NzPixelFormat::GetBitsPerPixel(nzPixelFormat format)
 {
 	switch (format)
 	{
+		case nzPixelFormat_A8:
+			return 8;
+
 		case nzPixelFormat_BGR8:
 			return 24;
 
@@ -287,20 +290,14 @@ inline nzUInt8 NzPixelFormat::GetBitsPerPixel(nzPixelFormat format)
 
 inline nzUInt8 NzPixelFormat::GetBytesPerPixel(nzPixelFormat format)
 {
-	nzUInt8 bytesPerPixel = GetBitsPerPixel(format)/8;
-
-	#if NAZARA_UTILITY_SAFE
-	if (bytesPerPixel == 0)
-		NazaraWarning("This format is either invalid or using less than one byte per pixel");
-	#endif
-
-	return bytesPerPixel;
+	return GetBitsPerPixel(format)/8;
 }
 
 inline nzPixelFormatType NzPixelFormat::GetType(nzPixelFormat format)
 {
 	switch (format)
 	{
+		case nzPixelFormat_A8:
 		case nzPixelFormat_BGR8:
 		case nzPixelFormat_BGRA8:
 		case nzPixelFormat_DXT1:
@@ -372,6 +369,7 @@ inline bool NzPixelFormat::HasAlpha(nzPixelFormat format)
 {
 	switch (format)
 	{
+		case nzPixelFormat_A8:
 		case nzPixelFormat_BGRA8:
 		case nzPixelFormat_DXT3:
 		case nzPixelFormat_DXT5:
@@ -444,6 +442,7 @@ inline bool NzPixelFormat::IsCompressed(nzPixelFormat format)
 		case nzPixelFormat_DXT5:
 			return true;
 
+		case nzPixelFormat_A8:
 		case nzPixelFormat_BGR8:
 		case nzPixelFormat_BGRA8:
 		case nzPixelFormat_L8:
@@ -529,6 +528,9 @@ inline NzString NzPixelFormat::ToString(nzPixelFormat format)
 {
 	switch (format)
 	{
+		case nzPixelFormat_A8:
+			return "A8";
+
 		case nzPixelFormat_BGR8:
 			return "BGR8";