private static void DrawWrapper(VisualStyleRenderer rnd, IDeviceContext dc, Rectangle bounds, DrawWrapperMethod func)
{
using (SafeGDIHandle primaryHdc = new SafeGDIHandle(dc))
{
// Create a memory DC so we can work offscreen
using (SafeCompatibleDCHandle memoryHdc = new SafeCompatibleDCHandle(primaryHdc))
{
// Create a device-independent bitmap and select it into our DC
BITMAPINFO info = new BITMAPINFO(bounds.Width, -bounds.Height);
using (SafeDCObjectHandle dib = new SafeDCObjectHandle(memoryHdc, GDI.CreateDIBSection(primaryHdc, ref info, 0, 0, IntPtr.Zero, 0)))
{
// Call method
func(memoryHdc);
// Copy to foreground
const int SRCCOPY = 0x00CC0020;
GDI.BitBlt(primaryHdc, bounds.Left, bounds.Top, bounds.Width, bounds.Height, memoryHdc, 0, 0, SRCCOPY);
}
}
}
}
private unsafe GlyphData GdiCreateGlyph(GlyphIndex glyphIndex)
{
// Measure the size
GDI.GLYPHMETRICS glyphMetrics;
GDI.MAT2 matrix = new GDI.MAT2 {
eM11 = 65536, eM12 = 0, eM21 = 0, eM22 = 65536
};
if (GDI.GetGlyphOutline(_gdiHdc, glyphIndex, GDI.GGO.GGO_METRICS | GDI.GGO.GGO_GLYPH_INDEX, out glyphMetrics, 0, IntPtr.Zero, ref matrix) == 0xffffffff)
{
throw new GDI.GDIException("GetGlyphOutline");
}
// Create bitmap
GDI.BITMAPINFO bitmapInfo;
bitmapInfo.biSize = Marshal.SizeOf(typeof(GDI.BITMAPINFO));
bitmapInfo.biWidth = glyphMetrics.width + _marginInTexture * 2;
bitmapInfo.biHeight = glyphMetrics.height + _marginInTexture * 2;
bitmapInfo.biPlanes = 1;
bitmapInfo.biBitCount = 32;
bitmapInfo.biCompression = 0; //BI_RGB
bitmapInfo.biSizeImage = 0;
bitmapInfo.biXPelsPerMeter = 1024;
bitmapInfo.biYPelsPerMeter = 1024;
bitmapInfo.biClrUsed = 0;
bitmapInfo.biClrImportant = 0;
IntPtr bitmapPtr;
IntPtr hbitmap = GDI.CreateDIBSection(_gdiHdc, ref bitmapInfo, GDI.DIB_RGB_COLORS, out bitmapPtr, IntPtr.Zero, 0);
if (hbitmap == IntPtr.Zero)
{
throw new GDI.GDIException("CreateDIBSection");
}
try
{
// Render gylph
IntPtr selectObjectResult = GDI.SelectObject(_gdiHdc, hbitmap);
if (selectObjectResult == IntPtr.Zero || selectObjectResult == new IntPtr(65535))
{
throw new GDI.GDIException("SelectObject");
}
GDI.RECT rect = new GDI.RECT {
Left = 0, Top = 0, Right = bitmapInfo.biWidth, Bottom = bitmapInfo.biHeight
};
if (!GDI.ExtTextOutW(_gdiHdc, _marginInTexture - glyphMetrics.x, _marginInTexture + glyphMetrics.y - _lineAscent, GDI.ETO.ETO_OPAQUE | GDI.ETO.ETO_CLIPPED | GDI.ETO.ETO_GLYPH_INDEX, ref rect, new IntPtr(&glyphIndex), 1, IntPtr.Zero))
{
throw new GDI.GDIException("ExtTextOut");
}
if (!GDI.GdiFlush())
{
throw new GDI.GDIException("GdiFlush");
}
// Convert RGB GDI image to RGBA byte array
// White color is mapped to full transparency
byte[] imageData = new byte[bitmapInfo.biWidth * bitmapInfo.biHeight * ImageC.PixelSize];
fixed(byte *destination2 = imageData)
{
uint *source = (uint *)bitmapPtr;
uint *destination = (uint *)destination2;
int count = bitmapInfo.biWidth * bitmapInfo.biHeight;
for (int i = 0; i < count; ++i)
{
// Optimized version of:
// https://stackoverflow.com/a/40862635
// White text
uint pixel = source[i];
uint r = 255 - (pixel & 0xff);
uint g = 255 - ((pixel >> 8) & 0xff);
uint b = 255 - ((pixel >> 16) & 0xff);
uint a = 255;
uint factor = a == 0 ? 0xff0000 : (0xff0000 / a);
r = Math.Min((r * factor + 0x8000) >> 16, 255);
g = Math.Min((g * factor + 0x8000) >> 16, 255);
b = Math.Min((b * factor + 0x8000) >> 16, 255);
destination[i] = (a << 24) | (b << 16) | (g << 8) | r;
/* // Black text
* uint pixel = source[i];
* uint r = pixel & 0xff;
* uint g = (pixel >> 8) & 0xff;
* uint b = (pixel >> 16) & 0xff;
* uint a = 0xff - Math.Min(r, Math.Min(g, b));
* uint factor = a == 0 ? 0xff0000 : (0xff0000 / a);
* r = (0xff8000 - Math.Min(0xff8000, (255 - r) * factor)) >> 16;
* g = (0xff8000 - Math.Min(0xff8000, (255 - g) * factor)) >> 16;
* b = (0xff8000 - Math.Min(0xff8000, (255 - b) * factor)) >> 16;
* destination[i] = (a << 24) | (b << 16) | (g << 8) | r;
*/
}
}
// TEST
//ImageC.FromByteArray(imageData, bitmapInfo.biWidth, bitmapInfo.biHeight).Save("T:\\Out.png");
// Generate output
return(new GlyphData
{
Image = ImageC.FromByteArray(imageData, bitmapInfo.biWidth, bitmapInfo.biHeight),
Offset = new VectorInt2(glyphMetrics.x - _marginInTexture, glyphMetrics.y + _marginInTexture)
});
}
finally
{
GDI.DeleteObject(hbitmap);
}
}