public static int GetPixelFormatDepth(GSPixelFormat fmt)
{
switch (fmt)
{
case GSPixelFormat.PSMTC32:
case GSPixelFormat.PSMZ32:
case GSPixelFormat.PSMZ24:
return(32);
case GSPixelFormat.PSMTC24:
return(24);
case GSPixelFormat.PSMTC16:
case GSPixelFormat.PSMTC16S:
case GSPixelFormat.PSMZ16:
case GSPixelFormat.PSMZ16S:
return(16);
case GSPixelFormat.PSMT8:
case GSPixelFormat.PSMT8H:
return(8);
case GSPixelFormat.PSMT4:
case GSPixelFormat.PSMT4HL:
case GSPixelFormat.PSMT4HH:
return(4);
default:
throw new ArgumentException(EXCEPTION_INVALID_PXFORMAT, nameof(fmt));
}
}
public static int GetTexelDataSize(GSPixelFormat fmt, int width, int height)
{
switch (fmt)
{
case GSPixelFormat.PSMTC32:
case GSPixelFormat.PSMTC24:
case GSPixelFormat.PSMZ32:
case GSPixelFormat.PSMZ24:
return((width * height) * 4);
case GSPixelFormat.PSMTC16:
case GSPixelFormat.PSMTC16S:
case GSPixelFormat.PSMZ16:
case GSPixelFormat.PSMZ16S:
return((width * height) * 2);
case GSPixelFormat.PSMT8:
case GSPixelFormat.PSMT8H:
return((width * height) * 1);
case GSPixelFormat.PSMT4:
case GSPixelFormat.PSMT4HL:
case GSPixelFormat.PSMT4HH:
return((width * height) / 2); // 4 bit index only takes up half a texel
default:
throw new ArgumentException(EXCEPTION_INVALID_PXFORMAT, nameof(fmt));
}
}
public static void WritePixelData <T>(GSPixelFormat fmt, BinaryWriter writer, int width, int height, T[] array)
{
if (IsIndexedPixelFormat(fmt))
{
var writePixelIndices = GetWritePixelIndicesDelegate(fmt);
writePixelIndices(writer, width, height, array as byte[]);
}
else
{
var writePixels = GetWritePixelColorDelegate(fmt);
writePixels(writer, width, height, array as Color[]);
}
}
// generic read/write methods
public static T[] ReadPixelData <T>(GSPixelFormat fmt, BinaryReader reader, int width, int height)
{
if (IsIndexedPixelFormat(fmt))
{
var readPixelIndices = GetReadPixelIndicesDelegate(fmt);
return(readPixelIndices(reader, width, height) as T[]);
}
else
{
var readPixels = GetReadPixelColorDelegate(fmt);
return(readPixels(reader, width, height) as T[]);
}
}
// alpha scalers
// helper methods to get info about the pixel format
public static int GetPaletteDimension(GSPixelFormat imageFmt)
{
int paletteWH = 16;
if (imageFmt == GSPixelFormat.PSMT4 ||
imageFmt == GSPixelFormat.PSMT4HH ||
imageFmt == GSPixelFormat.PSMT4HL)
{
paletteWH = 4;
}
return(paletteWH);
}
public static bool IsIndexedPixelFormat(GSPixelFormat fmt)
{
switch (fmt)
{
case GSPixelFormat.PSMT8:
case GSPixelFormat.PSMT4:
case GSPixelFormat.PSMT8H:
case GSPixelFormat.PSMT4HL:
case GSPixelFormat.PSMT4HH:
return(true);
}
return(false);
}
public static int GetIndexedColorCount(GSPixelFormat fmt)
{
switch (fmt)
{
case GSPixelFormat.PSMT8:
case GSPixelFormat.PSMT8H:
return(256);
case GSPixelFormat.PSMT4:
case GSPixelFormat.PSMT4HL:
case GSPixelFormat.PSMT4HH:
return(16);
default:
throw new ArgumentException(EXCEPTION_INVALID_PXFORMAT, nameof(fmt));
}
}
public static WritePixelIndicesDelegate GetWritePixelIndicesDelegate(GSPixelFormat fmt)
{
switch (fmt)
{
case GSPixelFormat.PSMT8:
case GSPixelFormat.PSMT8H:
return(WritePSMT8);
case GSPixelFormat.PSMT4:
case GSPixelFormat.PSMT4HL:
case GSPixelFormat.PSMT4HH:
return(WritePSMT4);
default:
throw new ArgumentException(EXCEPTION_INVALID_PXFORMAT, nameof(fmt));
}
}
public static WritePixelColorDelegate GetWritePixelColorDelegate(GSPixelFormat fmt)
{
switch (fmt)
{
case GSPixelFormat.PSMTC32:
case GSPixelFormat.PSMZ32:
return(WritePSMCT32);
case GSPixelFormat.PSMZ24:
case GSPixelFormat.PSMTC24:
return(WritePSMCT24);
case GSPixelFormat.PSMTC16:
case GSPixelFormat.PSMZ16:
return(WritePSMCT16);
case GSPixelFormat.PSMZ16S:
case GSPixelFormat.PSMTC16S:
return(WritePSMCT16S);
default:
throw new ArgumentException(EXCEPTION_INVALID_PXFORMAT, nameof(fmt));
}
}
