source: mainline/uspace/lib/draw/font/embedded.c@ 257feec

/*
 * Copyright (c) 2012 Petr Koupy
 * 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 draw
 * @{
 */
/**
 * @file
 */

#include <assert.h>
#include <sys/types.h>
#include <malloc.h>

#include "../gfx/font-8x16.h"
#include "embedded.h"
#include "../drawctx.h"

static void fde_init(char *path, uint16_t *glyph_count, void **data)
{
        assert(glyph_count);
        assert(data);

        (*glyph_count) = FONT_GLYPHS;
        (*data) = NULL;
}

static uint16_t fde_resolve(const wchar_t chr, void *data)
{
        return fb_font_glyph(chr);
}

static surface_t *fde_render(uint16_t glyph, uint16_t points)
{
        surface_t *template = surface_create(FONT_WIDTH, FONT_SCANLINES, NULL, 0);
        if (!template) {
                return NULL;
        }
        for (unsigned int y = 0; y < FONT_SCANLINES; ++y) {
                for (unsigned int x = 0; x < FONT_WIDTH; ++x) {
                        pixel_t p = (fb_font[glyph][y] & (1 << (7 - x))) ? 
                            PIXEL(255, 0, 0, 0) : PIXEL(0, 0, 0, 0);
                        surface_put_pixel(template, x, y, p);
                }
        }

        source_t source;
        source_init(&source);
        source_set_texture(&source, template, false);

        transform_t transform;
        transform_identity(&transform);
        if (points != FONT_SCANLINES) {
                double ratio = ((double) points) / ((double) FONT_SCANLINES);
                transform_scale(&transform, ratio, ratio);
                source_set_transform(&source, transform);
        }

        double width = FONT_WIDTH;
        double height = FONT_SCANLINES;
        transform_apply_linear(&transform, &width, &height);
        surface_t *result =
            surface_create((sysarg_t) (width + 0.5), (sysarg_t) (height + 0.5), NULL, 0);
        if (!result) {
                surface_destroy(template);
                return NULL;
        }

        drawctx_t context;
        drawctx_init(&context, result);
        drawctx_set_source(&context, &source);
        drawctx_transfer(&context, 0, 0,
            (sysarg_t) (width + 0.5), (sysarg_t) (height + 0.5));

        surface_destroy(template);

        return result;
}

static void fde_release(void *data)
{
        /* no-op */
}

font_decoder_t fd_embedded = {
        .init = fde_init,
        .resolve = fde_resolve,
        .render = fde_render,
        .release = fde_release
};

/** @}
 */