public void CreateIndexed()
{
// from: http://developer.apple.com/library/ios/#documentation/GraphicsImaging/Reference/CGColorSpace/Reference/reference.html
// m is the number of color components in the base color space
nint m = 3; // RGB
const int lastIndex = 2;
// An array of m*(lastIndex+1) bytes
byte[] table = new byte [3 * (lastIndex + 1)] {
1, 2, 3, 4, 5, 6, 255, 255, 255
};
using (var base_cs = CGColorSpace.CreateDeviceRGB())
using (var cs = CGColorSpace.CreateIndexed(base_cs, lastIndex, table)) {
Assert.That(cs.Components, Is.EqualTo((nint)1), "1");
Assert.That(cs.Model, Is.EqualTo(CGColorSpaceModel.Indexed), "Indexed");
var bcs = cs.GetBaseColorSpace();
Assert.That(bcs.Components, Is.EqualTo(m), "Components");
Assert.That(base_cs.Model, Is.EqualTo(bcs.Model), "GetBaseColorSpace");
var new_table = cs.GetColorTable();
Assert.That(table, Is.EqualTo(new_table), "GetColorTable");
if (TestRuntime.CheckXcodeVersion(5, 0))
{
Assert.Null(cs.GetICCProfile(), "GetICCProfile");
}
if (TestRuntime.CheckXcodeVersion(8, 0))
{
Assert.Null(cs.Name, "Name");
Assert.False(cs.IsWideGamutRgb, "IsWideGamutRgb");
Assert.False(cs.SupportsOutput, "SupportsOutput");
Assert.Null(cs.GetIccData(), "GetIccData");
}
}
}
public static CALayer CreateLayerFromPalettedData(byte[] data, byte[] palette, ushort width, ushort height)
{
CALayer layer = CALayer.Create();
layer.Bounds = new RectangleF(0, 0, width, height);
layer.Contents = new CGImage(width, height, 8, 8, width,
CGColorSpace.CreateIndexed(CGColorSpace.CreateDeviceRGB(), 255, palette),
CGImageAlphaInfo.None,
new CGDataProvider(data, 0, data.Length), null, false, CGColorRenderingIntent.Default);
return(layer);
}
public Bitmap(int width, int height, PixelFormat format)
{
imageTransform = new CGAffineTransform(1, 0, 0, -1, 0, height);
int bitsPerComponent, bytesPerRow;
CGColorSpace colorSpace;
CGBitmapFlags bitmapInfo;
bool premultiplied = false;
int bitsPerPixel = 0;
pixelFormat = format;
// Don't forget to set the Image width and height for size.
imageSize.Width = width;
imageSize.Height = height;
switch (format)
{
case PixelFormat.Format32bppPArgb:
case PixelFormat.DontCare:
premultiplied = true;
colorSpace = CGColorSpace.CreateDeviceRGB();
bitsPerComponent = 8;
bitsPerPixel = 32;
bitmapInfo = CGBitmapFlags.PremultipliedLast;
break;
case PixelFormat.Format32bppArgb:
colorSpace = CGColorSpace.CreateDeviceRGB();
bitsPerComponent = 8;
bitsPerPixel = 32;
bitmapInfo = CGBitmapFlags.PremultipliedLast;
break;
case PixelFormat.Format32bppRgb:
colorSpace = CGColorSpace.CreateDeviceRGB();
bitsPerComponent = 8;
bitsPerPixel = 32;
bitmapInfo = CGBitmapFlags.NoneSkipLast;
break;
case PixelFormat.Format24bppRgb:
colorSpace = CGColorSpace.CreateDeviceRGB();
bitsPerComponent = 8;
bitsPerPixel = 24;
bitmapInfo = CGBitmapFlags.None;
break;
case PixelFormat.Format8bppIndexed:
// FIXME: Default palette
colorSpace = CGColorSpace.CreateIndexed(CGColorSpace.CreateDeviceRGB(), 255, new byte[3 * 256]);
bitsPerComponent = 8;
bitsPerPixel = 8;
bitmapInfo = CGBitmapFlags.None;
palette = new ColorPalette(0, new Color[256]);
break;
case PixelFormat.Format4bppIndexed:
// FIXME: Default palette
colorSpace = CGColorSpace.CreateIndexed(CGColorSpace.CreateDeviceRGB(), 15, new byte[3 * 16]);
bitsPerComponent = 4;
bitsPerPixel = 4;
bitmapInfo = CGBitmapFlags.None;
palette = new ColorPalette(0, new Color[16]);
break;
case PixelFormat.Format1bppIndexed:
// FIXME: Default palette
colorSpace = CGColorSpace.CreateIndexed(CGColorSpace.CreateDeviceRGB(), 1, new byte[3 * 2]);
bitsPerComponent = 1;
bitsPerPixel = 1;
bitmapInfo = CGBitmapFlags.None;
palette = new ColorPalette(0, new Color[2] {
Color.Black, Color.White
});
break;
default:
throw new Exception("Format not supported: " + format);
}
bytesPerRow = (int)(((long)width * bitsPerPixel + 7) / 8);
int size = bytesPerRow * height;
bitmapBlock = Marshal.AllocHGlobal(size);
unsafe {
byte *b = (byte *)bitmapBlock;
for (int i = 0; i < size; i++)
{
b [i] = 0;
}
}
dataProvider = new CGDataProvider(bitmapBlock, size, true);
NativeCGImage = new CGImage(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, colorSpace, bitmapInfo, dataProvider, null, false, CGColorRenderingIntent.Default);
dpiWidth = dpiHeight = ConversionHelpers.MS_DPI;
physicalDimension.Width = width;
physicalDimension.Height = height;
// The physical size may be off on certain implementations. For instance the dpiWidth and dpiHeight
// are read using integers in core graphics but in windows it is a float.
// For example:
// coregraphics dpiWidth = 24 as integer
// windows dpiWidth = 24.999935 as float
// this gives a few pixels difference when calculating the physical size.
// 256 * 96 / 24 = 1024
// 256 * 96 / 24.999935 = 983.04
//
// https://bugzilla.xamarin.com/show_bug.cgi?id=14365
// PR: https://github.com/mono/maccore/pull/57
//
physicalSize = new SizeF(physicalDimension.Width, physicalDimension.Height);
physicalSize.Width *= ConversionHelpers.MS_DPI / dpiWidth;
physicalSize.Height *= ConversionHelpers.MS_DPI / dpiHeight;
rawFormat = ImageFormat.MemoryBmp;
pixelFormat = format;
if (premultiplied)
{
} // make compiler happy
}