Re: [Devel] Freetype bitmap to Windows DIB?

[Leonard Rosenthol]

At 10:31 PM 3/11/2002 -0500, Ron Olson wrote:
> Unfortuantly, working with the library has exposed a weakness in my
> knowledge of graphics programming under Win32. I'm very familiar with
> the DDB window format, GDI, DCs, etc. DIBs are something I've never
> worked with before, and frankly, I'm stumped.

        No need to worry about DIB's...


> I'm willing to post the laughably pathetic examples of what I've tried
> to do so far, but I'm more hoping for "here's some sample code, now go
> away".

        Here are some snippets from some code that I use to render an 
FT_Glyph into an HBITMAP which is then easily copyable to a DC/DIB, etc.

        Hope it helps...


Leonard
___________________________________
HDC             glyphDC;        // DC to draw glyph into
HBITMAP         glyphBits;      // bitmap
TT_Glyph        glyph;
TT_Raster_Map   ras;

// make the bitmap
RECT            theBounds = { 0, 0, ras.width, ras.rows };
glyphBits = CreateCompatibleBitmap( engine->mDC, ras.width, ras.rows );

// make a DC for the bitmap & stick in it there
glyphDC = CreateCompatibleDC( engine->mDC );
SelectObject( glyphDC, glyphBits );

// clear it white, just in case
HBRUSH  whiteBrush = CreateSolidBrush( RGB( 255, 255, 255 ) );
FillRect( glyphDC, &theBounds, whiteBrush );
DeleteObject( whiteBrush );


// I only want 4 levels of color (not the full 256)
colors[4].red = r;      colors[4].green = g;    colors[4].blue = b;
colors[3].red = (3*r + 0xFF) / 4;
colors[3].green = (3*g + 0xFF) / 4;
colors[3].blue = (3*b + 0xFF) / 4;
colors[2].red = (r + 0xFF) / 2;
colors[2].green = (g + 0xFF) / 2;
colors[2].blue = (b + 0xFF) / 2;
colors[1].red = (r + (3*0xFF)) / 4;
colors[1].green = (g + (3*0xFF)) / 4;
colors[1].blue = (b + (3*0xFF)) / 4;
colors[0].red = colors[0].green = colors[0].blue = 0xFF;

// stuff the glyph pixmap into the image
p = (TT_Byte *)ras.bitmap;
for (yy = 0; yy < ras.rows; ++yy) {
        for (xx = 0; xx < ras.width; ++xx) {
                pix = *p++;
                if (true /* pix > 0 */) {
                        if (pix > 4) {
                                pix = 4;
                        }

                        SetPixelV(glyphDC, xx, yy, RGB(colors[pix].red, 
colors[pix].green, colors[pix].blue));
                }
        }
}

---------------------------------------------------------------------------
Leonard Rosenthol                            <mailto:address@hidden>
Lazerware                                     <http://www.lazerware.com>