source: mainline/uspace/lib/gfxfont/src/font.c@ bc52b5b

/*
 * Copyright (c) 2020 Jiri Svoboda
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libgfxfont
 * @{
 */
/**
 * @file Font
 */

#include <adt/list.h>
#include <assert.h>
#include <byteorder.h>
#include <errno.h>
#include <gfx/bitmap.h>
#include <gfx/font.h>
#include <gfx/glyph.h>
#include <mem.h>
#include <stdlib.h>
#include "../private/font.h"
#include "../private/glyph.h"
#include "../private/tpf_file.h"
#include "../private/typeface.h"

/** Initialize font metrics structure.
 *
 * Font metrics structure must always be initialized using this function
 * first.
 *
 * @param metrics Font metrics structure
 */
void gfx_font_metrics_init(gfx_font_metrics_t *metrics)
{
        memset(metrics, 0, sizeof(gfx_font_metrics_t));
}

/** Initialize font properties structure.
 *
 * Font properties structure must always be initialized using this function
 * first.
 *
 * @param props Font properties structure
 */
void gfx_font_props_init(gfx_font_props_t *props)
{
        memset(props, 0, sizeof(gfx_font_props_t));
}

/** Get font properties.
 *
 * @param finfo Font info
 * @param props Place to store font properties
 */
void gfx_font_get_props(gfx_font_info_t *finfo, gfx_font_props_t *props)
{
        *props = finfo->props;
}

/** Create font with existing font info structure.
 *
 * @param tface Typeface
 * @param finfo Font info
 * @param metrics Font metrics
 * @param rfont Place to store pointer to new font
 *
 * @return EOK on success, EINVAL if parameters are invald,
 *         ENOMEM if insufficient resources, EIO if graphic device connection
 *         was lost
 */
static errno_t gfx_font_create_with_info(gfx_typeface_t *tface,
    gfx_font_info_t *finfo, gfx_font_metrics_t *metrics, gfx_font_t **rfont)
{
        gfx_font_t *font = NULL;
        gfx_bitmap_params_t params;
        errno_t rc;

        font = calloc(1, sizeof(gfx_font_t));
        if (font == NULL) {
                rc = ENOMEM;
                goto error;
        }
        font->typeface = tface;
        font->finfo = finfo;

        font->rect.p0.x = 0;
        font->rect.p0.y = 0;
        font->rect.p1.x = 1;
        font->rect.p1.y = 1;

        rc = gfx_font_set_metrics(font, metrics);
        if (rc != EOK) {
                assert(rc == EINVAL);
                goto error;
        }

        /* Create font bitmap */
        gfx_bitmap_params_init(&params);
        params.rect = font->rect;
        params.flags = bmpf_color_key | bmpf_colorize;
        params.key_color = PIXEL(0, 0, 0, 0);

        rc = gfx_bitmap_create(tface->gc, &params, NULL, &font->bitmap);
        if (rc != EOK)
                goto error;

        font->metrics = *metrics;
        list_initialize(&font->glyphs);
        *rfont = font;
        return EOK;
error:
        if (font != NULL)
                free(font);
        return rc;
}

/** Create font.
 *
 * @param tface Typeface
 * @param props Font properties
 * @param metrics Font metrics
 * @param rfont Place to store pointer to new font
 *
 * @return EOK on success, EINVAL if parameters are invald,
 *         ENOMEM if insufficient resources, EIO if graphic device connection
 *         was lost
 */
errno_t gfx_font_create(gfx_typeface_t *tface, gfx_font_props_t *props,
    gfx_font_metrics_t *metrics, gfx_font_t **rfont)
{
        gfx_font_info_t *finfo = NULL;
        gfx_font_t *font = NULL;
        errno_t rc;

        finfo = calloc(1, sizeof(gfx_font_info_t));
        if (finfo == NULL) {
                rc = ENOMEM;
                goto error;
        }

        finfo->typeface = tface;
        finfo->props = *props;

        rc = gfx_font_create_with_info(tface, finfo, metrics, &font);
        if (rc != EOK)
                goto error;

        finfo->font = font;
        list_append(&finfo->lfonts, &tface->fonts);
        *rfont = font;
        return EOK;
error:
        if (finfo != NULL)
                free(finfo);
        return rc;
}

/** Create dummy font for printing text in text mode.
 *
 * @param tface Typeface
 * @param rfont Place to store pointer to new font
 *
 * @return EOK on success, EINVAL if parameters are invald,
 *         ENOMEM if insufficient resources, EIO if graphic device connection
 *         was lost
 */
errno_t gfx_font_create_textmode(gfx_typeface_t *tface, gfx_font_t **rfont)
{
        gfx_font_props_t props;
        gfx_font_metrics_t metrics;

        gfx_font_props_init(&props);
        props.size = 1;
        props.flags = gff_text_mode;

        gfx_font_metrics_init(&metrics);
        metrics.ascent = 0;
        metrics.descent = 0;
        metrics.leading = 1;

        return gfx_font_create(tface, &props, &metrics, rfont);
}

/** Open font.
 *
 * @param finfo Font info
 * @param rfont Place to store pointer to open font
 * @return EOK on success or an error code
 */
errno_t gfx_font_open(gfx_font_info_t *finfo, gfx_font_t **rfont)
{
        errno_t rc;

        if (finfo->font == NULL) {
                /* Load absent font from TPF file */
                rc = gfx_font_load(finfo);
                if (rc != EOK)
                        return rc;

                assert(finfo->font != NULL);
                finfo->font->finfo = finfo;
        }

        *rfont = finfo->font;
        return EOK;
}

/** Close font.
 *
 * @param font Font
 */
void gfx_font_close(gfx_font_t *font)
{
        gfx_glyph_t *glyph;

        glyph = gfx_font_first_glyph(font);
        while (glyph != NULL) {
                gfx_glyph_destroy(glyph);
                glyph = gfx_font_first_glyph(font);
        }

        font->finfo->font = NULL;
        free(font);
}

/** Get font metrics.
 *
 * @param font Font
 * @param metrics Place to store metrics
 */
void gfx_font_get_metrics(gfx_font_t *font, gfx_font_metrics_t *metrics)
{
        *metrics = font->metrics;
}

/** Set font metrics.
 *
 * @param font Font
 * @param metrics Place to store metrics
 * @return EOK on success, EINVAL if supplied metrics are invalid
 */
errno_t gfx_font_set_metrics(gfx_font_t *font, gfx_font_metrics_t *metrics)
{
        font->metrics = *metrics;
        return EOK;
}

/** Get first glyph in font.
 *
 * @param font Font
 * @return First glyph or @c NULL if there are none
 */
gfx_glyph_t *gfx_font_first_glyph(gfx_font_t *font)
{
        link_t *link;

        link = list_first(&font->glyphs);
        if (link == NULL)
                return NULL;

        return list_get_instance(link, gfx_glyph_t, lglyphs);
}

/** Get next glyph in font.
 *
 * @param cur Current glyph
 * @return Next glyph in font or @c NULL if @a cur was the last one
 */
gfx_glyph_t *gfx_font_next_glyph(gfx_glyph_t *cur)
{
        link_t *link;

        link = list_next(&cur->lglyphs, &cur->font->glyphs);
        if (link == NULL)
                return NULL;

        return list_get_instance(link, gfx_glyph_t, lglyphs);
}

/** Get last glyph in font.
 *
 * @param font Font
 * @return Last glyph or @c NULL if there are none
 */
gfx_glyph_t *gfx_font_last_glyph(gfx_font_t *font)
{
        link_t *link;

        link = list_last(&font->glyphs);
        if (link == NULL)
                return NULL;

        return list_get_instance(link, gfx_glyph_t, lglyphs);
}

/** Get previous glyph in font.
 *
 * @param cur Current glyph
 * @return Previous glyph in font or @c NULL if @a cur was the last one
 */
gfx_glyph_t *gfx_font_prev_glyph(gfx_glyph_t *cur)
{
        link_t *link;

        link = list_prev(&cur->lglyphs, &cur->font->glyphs);
        if (link == NULL)
                return NULL;

        return list_get_instance(link, gfx_glyph_t, lglyphs);
}

/** Search for glyph that should be set for the beginning of a string.
 *
 * @param font Font
 * @param str String whose beginning we would like to set
 * @param rglyph Place to store glyph that should be set
 * @param rsize Place to store number of bytes to advance in the string
 * @return EOK on success, ENOENT if no matching glyph was found
 */
errno_t gfx_font_search_glyph(gfx_font_t *font, const char *str,
    gfx_glyph_t **rglyph, size_t *rsize)
{
        gfx_glyph_t *glyph;
        size_t msize;

        glyph = gfx_font_first_glyph(font);
        while (glyph != NULL) {
                if (gfx_glyph_matches(glyph, str, &msize)) {
                        *rglyph = glyph;
                        *rsize = msize;
                        return EOK;
                }

                glyph = gfx_font_next_glyph(glyph);
        }

        return ENOENT;
}

/** Replace glyph graphic with empty space of specified width.
 *
 * This is used to resize a glyph in the font bitmap. This changes
 * the bitmap widht might also make the bitmap taller.
 * Dimensions of the glyph are also adjusted according to @a nrect.
 *
 * @param font Font
 * @param glyph Glyph to replace
 * @param nrect Replacement rectangle
 */
errno_t gfx_font_splice_at_glyph(gfx_font_t *font, gfx_glyph_t *glyph,
    gfx_rect_t *nrect)
{
        gfx_glyph_t *g;
        gfx_bitmap_t *nbitmap;
        gfx_bitmap_params_t params;
        gfx_coord_t dwidth;
        gfx_coord_t x0;
        errno_t rc;

        /* Change of width of glyph */
        dwidth = (nrect->p1.x - nrect->p0.x) -
            (glyph->rect.p1.x - glyph->rect.p0.x);

        /* Create new font bitmap, wider by dwidth pixels */
        gfx_bitmap_params_init(&params);
        params.rect = font->rect;
        params.rect.p1.x += dwidth;
        if (nrect->p1.y - nrect->p0.y > params.rect.p1.y)
                params.rect.p1.y = nrect->p1.y - nrect->p0.y;
        params.flags = bmpf_color_key | bmpf_colorize;
        params.key_color = PIXEL(0, 0, 0, 0);

        rc = gfx_bitmap_create(font->typeface->gc, &params, NULL, &nbitmap);
        if (rc != EOK)
                goto error;

        /*
         * In x0 we compute the left margin of @a glyph. We start with
         * zero and then, if there are any preceding glyphs, we set it
         * to the right margin of the last one.
         */
        x0 = 0;

        /* Transfer glyphs before @a glyph */
        g = gfx_font_first_glyph(font);
        while (g != glyph) {
                assert(g != NULL);

                rc = gfx_glyph_transfer(g, 0, nbitmap, &params.rect);
                if (rc != EOK)
                        goto error;

                /* Left margin of the next glyph */
                x0 = g->rect.p1.x;

                g = gfx_font_next_glyph(g);
        }

        /* Skip @a glyph */
        g = gfx_font_next_glyph(g);

        /* Transfer glyphs after glyph */
        while (g != NULL) {
                rc = gfx_glyph_transfer(g, dwidth, nbitmap, &params.rect);
                if (rc != EOK)
                        goto error;

                /* Update glyph coordinates */
                g->rect.p0.x += dwidth;
                g->rect.p1.x += dwidth;
                g->origin.x += dwidth;

                g = gfx_font_next_glyph(g);
        }

        /* Place glyph rectangle inside the newly created space */
        glyph->origin.x = x0 - nrect->p0.x;
        glyph->origin.y = 0 - nrect->p0.y;
        gfx_rect_translate(&glyph->origin, nrect, &glyph->rect);

        /* Update font bitmap */
        gfx_bitmap_destroy(font->bitmap);
        font->bitmap = nbitmap;
        font->rect = params.rect;

        return EOK;
error:
        if (nbitmap != NULL)
                gfx_bitmap_destroy(nbitmap);
        return rc;
}

/** Load font properties from RIFF TPF file.
 *
 * @param parent Parent chunk
 * @param props Font properties
 * @return EOK on success or an error code
 */
static errno_t gfx_font_props_load(riff_rchunk_t *parent,
    gfx_font_props_t *props)
{
        errno_t rc;
        riff_rchunk_t propsck;
        tpf_font_props_t tprops;
        size_t nread;

        rc = riff_rchunk_match(parent, CKID_fprp, &propsck);
        if (rc != EOK)
                return rc;

        rc = riff_read(&propsck, (void *) &tprops, sizeof(tprops), &nread);
        if (rc != EOK || nread != sizeof(tprops))
                return EIO;

        rc = riff_rchunk_end(&propsck);
        if (rc != EOK)
                return rc;

        props->size = uint16_t_le2host(tprops.size);
        props->flags = uint16_t_le2host(tprops.flags);

        return EOK;
}

/** Save font properties to RIFF TPF file.
 *
 * @param props Font properties
 * @param riffw RIFF writer
 * @return EOK on success or an error code
 */
static errno_t gfx_font_props_save(gfx_font_props_t *props, riffw_t *riffw)
{
        errno_t rc;
        riff_wchunk_t propsck;
        tpf_font_props_t tprops;

        tprops.size = host2uint16_t_le(props->size);
        tprops.flags = host2uint16_t_le(props->flags);

        rc = riff_wchunk_start(riffw, CKID_fprp, &propsck);
        if (rc != EOK)
                return rc;

        rc = riff_write(riffw, (void *) &tprops, sizeof(tprops));
        if (rc != EOK)
                return rc;

        rc = riff_wchunk_end(riffw, &propsck);
        if (rc != EOK)
                return rc;

        return EOK;
}

/** Load font metrics from RIFF TPF file.
 *
 * @param parent Parent chunk
 * @param metrics Font metrics
 * @return EOK on success or an error code
 */
static errno_t gfx_font_metrics_load(riff_rchunk_t *parent,
    gfx_font_metrics_t *metrics)
{
        errno_t rc;
        riff_rchunk_t mtrck;
        tpf_font_metrics_t tmetrics;
        size_t nread;

        rc = riff_rchunk_match(parent, CKID_fmtr, &mtrck);
        if (rc != EOK)
                return rc;

        rc = riff_read(&mtrck, (void *) &tmetrics, sizeof(tmetrics), &nread);
        if (rc != EOK || nread != sizeof(tmetrics))
                return EIO;

        rc = riff_rchunk_end(&mtrck);
        if (rc != EOK)
                return rc;

        metrics->ascent = uint16_t_le2host(tmetrics.ascent);
        metrics->descent = uint16_t_le2host(tmetrics.descent);
        metrics->leading = uint16_t_le2host(tmetrics.leading);
        return EOK;
}

/** Save font metrics to RIFF TPF file.
 *
 * @param metrics Font metrics
 * @param riffw RIFF writer
 * @return EOK on success or an error code
 */
static errno_t gfx_font_metrics_save(gfx_font_metrics_t *metrics,
    riffw_t *riffw)
{
        errno_t rc;
        tpf_font_metrics_t tmetrics;
        riff_wchunk_t mtrck;

        tmetrics.ascent = host2uint16_t_le(metrics->ascent);
        tmetrics.descent = host2uint16_t_le(metrics->descent);
        tmetrics.leading = host2uint16_t_le(metrics->leading);

        rc = riff_wchunk_start(riffw, CKID_fmtr, &mtrck);
        if (rc != EOK)
                return rc;

        rc = riff_write(riffw, (void *) &tmetrics, sizeof(tmetrics));
        if (rc != EOK)
                return rc;

        rc = riff_wchunk_end(riffw, &mtrck);
        if (rc != EOK)
                return rc;

        return EOK;
}

/** Bit pack font bitmap into 1 bits/pixel format.
 *
 * @param width Bitmap width
 * @param height Bitmap height
 * @param pixels Bitmap pixels
 * @param rdata Place to store pointer to packed data
 * @param rsize Place to store size of packed data
 * @return EOK on sucess, ENOMEM if out of memory
 */
errno_t gfx_font_bitmap_pack(gfx_coord_t width, gfx_coord_t height,
    uint32_t *pixels, void **rdata, size_t *rsize)
{
        void *data;
        size_t size;
        size_t bytes_line;
        gfx_coord_t x, y;
        uint8_t b;
        uint8_t *dp;
        uint32_t *sp;
        uint32_t pix;

        bytes_line = (width + 7) / 8;
        size = height * bytes_line;

        data = malloc(size);
        if (data == NULL)
                return ENOMEM;

        sp = pixels;
        dp = data;
        for (y = 0; y < height; y++) {
                b = 0;
                for (x = 0; x < width; x++) {
                        pix = *sp++;
                        b = (b << 1) | (pix & 1);
                        /* Write eight bits */
                        if ((x & 7) == 7) {
                                *dp++ = b;
                                b = 0;
                        }
                }

                /* Write remaining bits */
                if ((x & 7) != 0) {
                        b = b << (8 - (x & 7));
                        *dp++ = b;
                }
        }

        *rdata = data;
        *rsize = size;
        return EOK;
}

/** Unpack font bitmap from 1 bits/pixel format.
 *
 * @param width Bitmap width
 * @param height Bitmap height
 * @param data Packed data
 * @param dsize Size of packed data
 * @param pixels Bitmap pixels
 * @return EOK on success, EINVAL if data size is invalid
 */
errno_t gfx_font_bitmap_unpack(gfx_coord_t width, gfx_coord_t height,
    void *data, size_t dsize, uint32_t *pixels)
{
        size_t size;
        size_t bytes_line;
        gfx_coord_t x, y;
        uint8_t b;
        uint8_t *sp;
        uint32_t *dp;

        bytes_line = (width + 7) / 8;
        size = height * bytes_line;

        if (dsize != size)
                return EINVAL;

        sp = data;
        dp = pixels;
        for (y = 0; y < height; y++) {
                b = 0;
                for (x = 0; x < width; x++) {
                        if ((x & 7) == 0)
                                b = *sp++;
                        *dp++ = (b >> 7) ? PIXEL(255, 255, 255, 255) :
                            PIXEL(0, 0, 0, 0);
                        b = b << 1;
                }
        }

        return EOK;
}

/** Load font bitmap from RIFF TPF file.
 *
 * @param parent Parent chunk
 * @param font Font
 * @return EOK on success or an error code
 */
static errno_t gfx_font_bitmap_load(riff_rchunk_t *parent, gfx_font_t *font)
{
        errno_t rc;
        riff_rchunk_t bmpck;
        tpf_font_bmp_hdr_t thdr;
        gfx_bitmap_params_t params;
        gfx_bitmap_alloc_t alloc;
        gfx_bitmap_t *bitmap = NULL;
        uint32_t width;
        uint32_t height;
        uint16_t fmt;
        uint16_t depth;
        size_t bytes_line;
        void *data = NULL;
        size_t size;
        size_t nread;

        rc = riff_rchunk_match(parent, CKID_fbmp, &bmpck);
        if (rc != EOK)
                goto error;

        rc = riff_read(&bmpck, &thdr, sizeof(thdr), &nread);
        if (rc != EOK || nread != sizeof(thdr))
                goto error;

        width = uint32_t_le2host(thdr.width);
        height = uint32_t_le2host(thdr.height);
        fmt = uint16_t_le2host(thdr.fmt);
        depth = uint16_t_le2host(thdr.depth);

        if (fmt != 0 || depth != 1) {
                rc = ENOTSUP;
                goto error;
        }

        bytes_line = (width + 7) / 8;
        size = height * bytes_line;

        data = malloc(size);
        if (data == NULL) {
                rc = ENOMEM;
                goto error;
        }

        gfx_bitmap_params_init(&params);
        params.rect.p0.x = 0;
        params.rect.p0.y = 0;
        params.rect.p1.x = width;
        params.rect.p1.y = height;
        params.flags = bmpf_color_key | bmpf_colorize;
        params.key_color = PIXEL(0, 0, 0, 0);

        rc = gfx_bitmap_create(font->typeface->gc, &params, NULL, &bitmap);
        if (rc != EOK)
                goto error;

        rc = gfx_bitmap_get_alloc(bitmap, &alloc);
        if (rc != EOK)
                goto error;

        rc = riff_read(&bmpck, data, size, &nread);
        if (rc != EOK)
                goto error;

        if (nread != size) {
                rc = EIO;
                goto error;
        }

        rc = riff_rchunk_end(&bmpck);
        if (rc != EOK)
                goto error;

        rc = gfx_font_bitmap_unpack(width, height, data, size, alloc.pixels);
        if (rc != EOK)
                goto error;

        free(data);
        gfx_bitmap_destroy(font->bitmap);
        font->bitmap = bitmap;
        font->rect = params.rect;
        return EOK;
error:
        if (data != NULL)
                free(data);
        if (bitmap != NULL)
                gfx_bitmap_destroy(bitmap);
        return rc;
}

/** Save font bitmap to RIFF TPF file.
 *
 * @param font Font
 * @param riffw RIFF writer
 * @return EOK on success or an error code
 */
static errno_t gfx_font_bitmap_save(gfx_font_t *font, riffw_t *riffw)
{
        errno_t rc;
        tpf_font_bmp_hdr_t thdr;
        riff_wchunk_t bmpck;
        gfx_bitmap_alloc_t alloc;
        void *data = NULL;
        size_t dsize;

        rc = gfx_bitmap_get_alloc(font->bitmap, &alloc);
        if (rc != EOK)
                return rc;

        rc = gfx_font_bitmap_pack(font->rect.p1.x, font->rect.p1.y,
            alloc.pixels, &data, &dsize);
        if (rc != EOK)
                return rc;

        thdr.width = host2uint32_t_le(font->rect.p1.x);
        thdr.height = host2uint32_t_le(font->rect.p1.y);
        thdr.fmt = 0;
        thdr.depth = host2uint16_t_le(1);

        rc = riff_wchunk_start(riffw, CKID_fbmp, &bmpck);
        if (rc != EOK)
                goto error;

        rc = riff_write(riffw, &thdr, sizeof(thdr));
        if (rc != EOK)
                goto error;

        rc = riff_write(riffw, data, dsize);
        if (rc != EOK)
                goto error;

        rc = riff_wchunk_end(riffw, &bmpck);
        if (rc != EOK)
                goto error;

        free(data);
        return EOK;
error:
        if (data != NULL)
                free(data);
        return rc;
}

/** Load font info from RIFF TPF file.
 *
 * @param tface Containing typeface
 * @param parent Parent chunk
 * @return EOK on success or an error code
 */
errno_t gfx_font_info_load(gfx_typeface_t *tface, riff_rchunk_t *parent)
{
        errno_t rc;
        riff_rchunk_t fontck;
        gfx_font_props_t props;
        gfx_font_info_t *finfo = NULL;
        gfx_font_t *font = NULL;

        rc = riff_rchunk_list_match(parent, LTYPE_font, &fontck);
        if (rc != EOK)
                goto error;

        finfo = calloc(1, sizeof(gfx_font_info_t));
        if (finfo == NULL) {
                rc = ENOMEM;
                goto error;
        }

        finfo->fontck = fontck;

        rc = gfx_font_props_load(&fontck, &props);
        if (rc != EOK)
                goto error;

        rc = riff_rchunk_end(&fontck);
        if (rc != EOK)
                goto error;

        finfo->typeface = tface;
        list_append(&finfo->lfonts, &tface->fonts);
        finfo->props = props;
        finfo->font = NULL;

        return EOK;
error:
        if (finfo != NULL)
                free(finfo);
        if (font != NULL)
                gfx_font_close(font);
        return rc;
}

/** Load font from RIFF TPF file.
 *
 * @param finfo Font information
 * @return EOK on success or an error code
 */
errno_t gfx_font_load(gfx_font_info_t *finfo)
{
        errno_t rc;
        gfx_font_metrics_t metrics;
        gfx_font_t *font = NULL;

        /* Seek to beginning of chunk (just after list type) */
        rc = riff_rchunk_seek(&finfo->fontck, sizeof(uint32_t), SEEK_SET);
        if (rc != EOK)
                goto error;

        rc = gfx_font_props_load(&finfo->fontck, &finfo->props);
        if (rc != EOK)
                goto error;

        rc = gfx_font_metrics_load(&finfo->fontck, &metrics);
        if (rc != EOK)
                goto error;

        rc = gfx_font_create_with_info(finfo->typeface, finfo, &metrics, &font);
        if (rc != EOK)
                goto error;

        rc = gfx_font_bitmap_load(&finfo->fontck, font);
        if (rc != EOK)
                goto error;

        while (true) {
                rc = gfx_glyph_load(font, &finfo->fontck);
                if (rc == ENOENT)
                        break;
                if (rc != EOK)
                        goto error;
        }

        finfo->font = font;
        return EOK;
error:
        if (font != NULL)
                gfx_font_close(font);
        return rc;
}

/** Save font into RIFF TPF file.
 *
 * @param finfo Font info
 * @param riffw RIFF writer
 * @return EOK on success or an error code
 */
errno_t gfx_font_save(gfx_font_info_t *finfo, riffw_t *riffw)
{
        errno_t rc;
        riff_wchunk_t fontck;
        gfx_glyph_t *glyph;

        rc = riff_wchunk_start(riffw, CKID_LIST, &fontck);
        if (rc != EOK)
                return rc;

        rc = riff_write_uint32(riffw, LTYPE_font);
        if (rc != EOK)
                return rc;

        rc = gfx_font_props_save(&finfo->props, riffw);
        if (rc != EOK)
                return rc;

        rc = gfx_font_metrics_save(&finfo->font->metrics, riffw);
        if (rc != EOK)
                return rc;

        rc = gfx_font_bitmap_save(finfo->font, riffw);
        if (rc != EOK)
                return rc;

        glyph = gfx_font_first_glyph(finfo->font);
        while (glyph != NULL) {
                rc = gfx_glyph_save(glyph, riffw);
                if (rc != EOK)
                        return rc;

                glyph = gfx_font_next_glyph(glyph);
        }

        rc = riff_wchunk_end(riffw, &fontck);
        if (rc != EOK)
                return rc;

        return EOK;
}

/** @}
 */