e16/src/text_xft.c

/*
 * Copyright (C) 2006-2021 Kim Woelders
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
 * deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
 * sell copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies of the Software, its documentation and marketing & publicity
 * materials, and acknowledgment shall be given in the documentation, materials
 * and software packages that this Software was used.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */
#include "config.h"

#include <X11/extensions/Xrender.h>
#include <X11/Xft/Xft.h>

#include "tclass.h"
#include "xtypes.h"

/*
 * Xft
 */
__EXPORT__ extern const FontOps FontOps_xft;

typedef struct {
    XftFont        *font;
    Win             win;
    EX_Drawable     draw;
    XftDraw        *xftd;
    XftColor        xftc;
} FontCtxXft;

static int
_xft_Load(TextState *ts, const char *name)
{
    XftFont        *font;
    FontCtxXft     *fdc;

    if (name[0] == '-')
        font = XftFontOpenXlfd(disp, Dpy.screen, name);
    else
        font = XftFontOpenName(disp, Dpy.screen, name);

    if (!font)
        return -1;

#if 0                           /* Debug */
    {
        FT_Face         ftf = XftLockFace(font);

        if (ftf == NULL)
            return -1;
        Eprintf("Font %s family_name=%s style_name=%s\n", name,
                ftf->family_name, ftf->style_name);
        XftUnlockFace(font);
    }
#endif

    fdc = EMALLOC(FontCtxXft, 1);
    if (!fdc)
        return -1;
    fdc->font = font;
    ts->fdc = fdc;
    ts->need_utf8 = 1;
    ts->type = FONT_TYPE_XFT;
    ts->ops = &FontOps_xft;
    return 0;
}

static void
_xft_Unload(TextState *ts)
{
    FontCtxXft     *fdc = (FontCtxXft *) ts->fdc;

    XftFontClose(disp, fdc->font);
}

static void
_xft_TextSize(TextState *ts, const char *text, int len,
              int *width, int *height, int *ascent)
{
    FontCtxXft     *fdc = (FontCtxXft *) ts->fdc;
    XGlyphInfo      gi;

    if (len == 0)
        len = strlen(text);
    XftTextExtentsUtf8(disp, fdc->font, (const XftChar8 *)text, len, &gi);
    *width = gi.xOff;
    *height = fdc->font->height;
    if (*height < fdc->font->ascent + fdc->font->descent)
        *height = fdc->font->ascent + fdc->font->descent;
    *ascent = fdc->font->ascent;
#if 0
    Eprintf("asc/dsc/h=%d/%d/%d x,y=%2d,%d wxh=%dx%d ox,y=%3d,%d: (%d)%s\n",
            fdc->font->ascent, fdc->font->descent, fdc->font->height,
            gi.x, gi.y, gi.width, gi.height, gi.xOff, gi.yOff, len, text);
#endif
}

static void
_xft_TextDraw(TextState *ts, int x, int y, const char *text, int len)
{
    FontCtxXft     *fdc = (FontCtxXft *) ts->fdc;

    XftDrawStringUtf8(fdc->xftd, &(fdc->xftc), fdc->font, x, y,
                      (const XftChar8 *)text, len);
}

__EXPORT__ int
_xft_FdcInit(TextState *ts, Win win, EX_Drawable draw)
{
    FontCtxXft     *fdc = (FontCtxXft *) ts->fdc;

    fdc->win = win;
    fdc->draw = draw;

    fdc->xftd = XftDrawCreate(disp, draw, WinGetVisual(win), WinGetCmap(win));
    if (!fdc->xftd)
        return -1;
    return 0;
}

__EXPORT__ void
_xft_FdcFini(TextState *ts)
{
    FontCtxXft     *fdc = (FontCtxXft *) ts->fdc;

    XftDrawDestroy(fdc->xftd);
}

__EXPORT__ void
_xft_FdcSetDrawable(TextState *ts, unsigned long draw)
{
    FontCtxXft     *fdc = (FontCtxXft *) ts->fdc;

    if (fdc->draw == draw)
        return;
    fdc->draw = draw;
    XftDrawChange(fdc->xftd, draw);
}

__EXPORT__ void
_xft_FdcSetColor(TextState *ts, unsigned int color)
{
    FontCtxXft     *fdc = (FontCtxXft *) ts->fdc;
    XRenderColor    xrc;

    COLOR32_TO_ARGB16(color, xrc.alpha, xrc.red, xrc.green, xrc.blue);

    XftColorAllocValue(disp, WinGetVisual(fdc->win), WinGetCmap(fdc->win),
                       &xrc, &(fdc->xftc));
}

const FontOps   FontOps_xft = {
    _xft_Load, _xft_Unload, _xft_TextSize, TextstateTextFit, _xft_TextDraw,
    _xft_FdcInit, _xft_FdcFini, _xft_FdcSetDrawable, _xft_FdcSetColor
};