First Last wrote:
> Hi, I try to use freetype with xlib, I , I need to pass a char type
> array (RGBA/pixel) to a xlib function.
>
> from freetype I got :
>
> face->glyph->bitmap.pixel_mode = 2
> so if I understood corectly in face->glyph->bitmap.buffer datas are stored in
> gray level.
> face->glyph->bitmap.rows=16
> face->glyph->bitmap.width=8
> face->glyph->bitmap.pitch=8
>
> so I guess, length of face->glyph->bitmap.buffer =
> 1(gray lvl)*16(width)*8(rows)=128 unsigned chars, right ?
Right answer, wrong reasoning; width should be replaced by pitch. The
two values may differ if there is padding between lines.
> then I create an array of char for xlib from face->glyph->bitmap.buffer
>
> for(i=0;i<128;i++){
> Xdata[4*i] = face->glyph->bitmap.buffer[i];
> Xdata[4*i+1] = face->glyph->bitmap.buffer[i];
> Xdata[4*i+2] = face->glyph->bitmap.buffer[i];
> Xdata[4*i+3] = 255;
> }
> and I try to create a XImage :
> ximage = XCreateImage(display, DefaultVisual(display,0), 24, ZPixmap, 0,
>
> &Xdata[0], 8/*rows*/, 16/*width*/,
> 32/*RGBA*/, 8/*pitch??*/);
The last argument (bytes_per_line) should be 32 (8 pixels wide at 4
bytes per pixel).
--
Glynn Clements <gl...@gclements.plus.com>
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