/// <summary>
/// Loads letter iamge from win32 font.
/// </summary>
/// <param name="cache">should the iamge be cached in tga, xml files.</param>
/// <returns>loader letter information.</returns>
protected internal override LetterInfo Load(bool cache)
{
LetterInfo result = null;
#if WINDOWS
IntPtr bitmapHandle = IntPtr.Zero;
byte[] textureData = null;
try
{
if (null == PlatformWindows.SelectFont(this.font.fontRenderingDisplayContext, this.font.fontHandle))
{
throw new Exception();
}
TextMetric tm = new TextMetric();
if (false == PlatformWindows.GetTextMetrics(this.font.fontRenderingDisplayContext, out tm))
{
throw new Exception();
}
if (PlatformWindows.GDI_ERROR == PlatformWindows.SetTextAlign(this.font.fontRenderingDisplayContext, PlatformWindows.TA_LEFT | PlatformWindows.TA_TOP | PlatformWindows.TA_UPDATECP))
{
throw new Exception();
}
ABC[] abc = new ABC[1];
if (false == PlatformWindows.GetCharABCWidths(this.font.fontRenderingDisplayContext, (uint)this.character, (uint)this.character, abc))
{
throw new Exception();
}
this.offsetX = abc[0].abcA;
this.width = (int)(abc[0].abcB + abc[0].abcC);
BitmapInfo header = new BitmapInfo();
header.bmiHeader.biSize = Marshal.SizeOf(header);
GlyphMetrics metrics = new GlyphMetrics();
MAT2 identity = new MAT2();
identity.eM12.value = 0;
identity.eM21.value = 0;
identity.eM11.value = 1;
identity.eM22.value = 1;
if (PlatformWindows.GDI_ERROR == PlatformWindows.GetGlyphOutline(this.font.fontRenderingDisplayContext, this.character, PlatformWindows.GGO_METRICS, out metrics, 0, IntPtr.Zero, ref identity))
{
throw new Exception();
}
header.bmiHeader.biWidth = metrics.gmBlackBoxX;
header.bmiHeader.biHeight = -1 * metrics.gmBlackBoxY;
header.bmiHeader.biPlanes = 1;
header.bmiHeader.biBitCount = 32;
header.bmiHeader.biCompression = 0;// BI_RGB;
byte[] bitmapData = null;
IntPtr bitmapDataPointer = IntPtr.Zero;
bitmapHandle = PlatformWindows.CreateDIBSection(this.font.fontRenderingDisplayContext, ref header, /*DIB_RGB_COLORS*/0, out bitmapDataPointer, IntPtr.Zero, 0);
if (IntPtr.Zero == bitmapHandle)
{
int err = Marshal.GetLastWin32Error();
throw new Exception();
}
if (null == PlatformWindows.SelectObject(this.font.fontRenderingDisplayContext, bitmapHandle))
{
throw new Exception();
}
if (PlatformWindows.CLR_INVALID == PlatformWindows.SetBkColor(this.font.fontRenderingDisplayContext, new RGB(new byte[] { 0, 0, 0 }).ToInt32()))
{
throw new Exception();
}
if (PlatformWindows.CLR_INVALID == PlatformWindows.SetTextColor(this.font.fontRenderingDisplayContext, new RGB(new byte[] { 0xff, 0xff, 0xff }).ToInt32()))
{
throw new Exception();
}
if (0 == PlatformWindows.SetBkMode(this.font.fontRenderingDisplayContext, PlatformWindows.OPAQUE))
{
throw new Exception();
}
if (false == PlatformWindows.MoveToEx(this.font.fontRenderingDisplayContext, 0 - abc[0].abcA, -1 * (tm.tmAscent - metrics.gmptGlyphOrigin.y), IntPtr.Zero))
{
throw new Exception();
}
this.offsetY = tm.tmAscent - metrics.gmptGlyphOrigin.y - tm.tmDescent - 1;
String str = "" + this.character;
RECT rect = new RECT();
if (false == PlatformWindows.ExtTextOut(this.font.fontRenderingDisplayContext, 0, 0, (uint)0, ref rect, str, 1, null))
{
throw new Exception();
}
if (0 == PlatformWindows.SetBkMode(this.font.fontRenderingDisplayContext, PlatformWindows.TRANSPARENT))
{
throw new Exception();
}
int bitmapWidth = header.bmiHeader.biWidth;
int bitmapHeight = -header.bmiHeader.biHeight;
int textureWidth = RoundToPowerOf2(bitmapWidth);
int textureHeight = RoundToPowerOf2(bitmapHeight);
bitmapData = new byte[bitmapWidth * bitmapHeight * 4];
Marshal.Copy(bitmapDataPointer, bitmapData, 0, bitmapWidth * bitmapHeight * 4);
textureData = new byte[4 * textureWidth * textureHeight];
for (int j = 0; j < textureHeight; j++)
{
for (int i = 0; i < textureWidth; i++)
{
textureData[4 * (i + j * textureWidth) + 0] = 0xff;
textureData[4 * (i + j * textureWidth) + 1] = 0xff;
textureData[4 * (i + j * textureWidth) + 2] = 0xff;
textureData[4 * (i + j * textureWidth) + 3] = (byte)((i >= bitmapWidth || j >= bitmapHeight) ? 0 : bitmapData[(i + bitmapWidth * j) * 4 + 2]);
}
}
if (true == cache)
{
result = new LetterInfo();
result.width = bitmapWidth;
result.height = bitmapHeight;
result.bytes = textureData;
result.textureWidth = textureWidth;
result.textureHeight = textureHeight;
}
else
{
this.image = this.engine.CreateImage("Letter [" + this.character + "]", textureWidth, textureHeight, textureData);
// this.internalImage = true;
}
this.textureWidth = textureWidth;
this.textureHeight = textureHeight;
}
catch (Exception)
{
this.engine.DeleteImage(ref this.image);
}
if (null != bitmapHandle)
{
PlatformWindows.DeleteObject(bitmapHandle);
}
this.loaded = true;
#endif
return result;
}
internal static extern bool GetTextMetrics(IntPtr hdc, out TextMetric lptm);
internal static extern bool GetTextMetrics(IntPtr hdc, out TextMetric lptm);