font.c

/*
 * Copyright (c) 1997-2006  Motoyuki Kasahara
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 * 3. Neither the name of the project nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``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 PROJECT OR CONTRIBUTORS 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.
 */

#include "build-pre.h"
#include "eb.h"
#include "error.h"
#include "font.h"
#include "build-post.h"

/*
 * Initialize all fonts in the current subbook.
 */
void
eb_initialize_fonts(EB_Book *book)
{
    EB_Subbook *subbook;
    EB_Font *font;
    int i;

    LOG(("in: eb_initialize_fonts(book=%d)", (int)book->code));

    subbook = book->subbook_current;

    for (i = 0, font = subbook->narrow_fonts; i < EB_MAX_FONTS; i++, font++) {
    font->font_code = EB_FONT_INVALID;
    font->initialized = 0;
    font->start = -1;
    font->end = -1;
    font->page = 0;
    font->glyphs = NULL;
    zio_initialize(&font->zio);
    }

    for (i = 0, font = subbook->wide_fonts; i < EB_MAX_FONTS; i++, font++) {
    font->font_code = EB_FONT_INVALID;
    font->initialized = 0;
    font->start = -1;
    font->end = -1;
    font->page = 0;
    font->glyphs = NULL;
    zio_initialize(&font->zio);
    }

    LOG(("out: eb_initialize_fonts()"));
}


/*
 * Load font files.
 */
void
eb_load_font_headers(EB_Book *book)
{
    EB_Error_Code error_code;
    EB_Subbook *subbook;
    EB_Font_Code i;

    LOG(("in: eb_load_fonts(book=%d)", (int)book->code));

    subbook = book->subbook_current;

    /*
     * Load narrow font headers.
     */
    for (i = 0; i < EB_MAX_FONTS; i++) {
    if (subbook->narrow_fonts[i].font_code == EB_FONT_INVALID
        || subbook->narrow_fonts[i].initialized)
        continue;

    error_code = eb_open_narrow_font_file(book, i);
    if (error_code == EB_SUCCESS)
        error_code = eb_load_narrow_font_header(book, i);
    if (error_code != EB_SUCCESS)
        subbook->narrow_fonts[i].font_code = EB_FONT_INVALID;
    subbook->narrow_fonts[i].initialized = 1;
    zio_close(&subbook->narrow_fonts[i].zio);
    }

    /*
     * Load wide font header.
     */
    for (i = 0; i < EB_MAX_FONTS; i++) {
    if (subbook->wide_fonts[i].font_code == EB_FONT_INVALID
        || subbook->wide_fonts[i].initialized)
        continue;

    error_code = eb_open_wide_font_file(book, i);
    if (error_code == EB_SUCCESS)
        error_code = eb_load_wide_font_header(book, i);
    if (error_code != EB_SUCCESS)
        subbook->wide_fonts[i].font_code = EB_FONT_INVALID;
    subbook->wide_fonts[i].initialized = 1;
    zio_close(&subbook->wide_fonts[i].zio);
    }

    LOG(("out: eb_load_font_headers()"));
}


/*
 * Finalize all fonts in the current subbook.
 */
void
eb_finalize_fonts(EB_Book *book)
{
    EB_Subbook *subbook;
    EB_Font *font;
    int i;

    LOG(("in: eb_finalize_fonts(book=%d)", (int)book->code));

    subbook = book->subbook_current;

    for (i = 0, font = subbook->narrow_fonts; i < EB_MAX_FONTS; i++, font++) {
    zio_finalize(&font->zio);
    if (font->glyphs != NULL) {
        free(font->glyphs);
        font->glyphs = NULL;
    }
    }

    for (i = 0, font = subbook->wide_fonts; i < EB_MAX_FONTS; i++, font++) {
    zio_finalize(&font->zio);
    if (font->glyphs != NULL) {
        free(font->glyphs);
        font->glyphs = NULL;
    }
    }

    LOG(("out: eb_finalize_fonts()"));
}


/*
 * Look up the height of the current font of the current subbook in
 * `book'.
 */
EB_Error_Code
eb_font(EB_Book *book, EB_Font_Code *font_code)
{
    EB_Error_Code error_code;

    LOG(("in: eb_font(book=%d)", (int)book->code));

    /*
     * Current subbook must have been set.
     */
    if (book->subbook_current == NULL) {
    error_code = EB_ERR_NO_CUR_SUB;
    goto failed;
    }

    /*
     * Look up the height of the current font.
     */
    if (book->subbook_current->narrow_current != NULL)
    *font_code = book->subbook_current->narrow_current->font_code;
    else if (book->subbook_current->wide_current != NULL)
    *font_code = book->subbook_current->wide_current->font_code;
    else {
    error_code = EB_ERR_NO_CUR_FONT;
    goto failed;
    }

    LOG(("out: eb_font(font_code=%d) = %s", (int)*font_code,
    eb_error_string(EB_SUCCESS)));

    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    *font_code = EB_FONT_INVALID;
    LOG(("out: eb_font() = %s", eb_error_string(error_code)));
    return error_code;
}


/*
 * Set the font with `font_code' as the current font of the current
 * subbook in `book'.
 */
EB_Error_Code
eb_set_font(EB_Book *book, EB_Font_Code font_code)
{
    EB_Error_Code error_code;
    EB_Subbook *subbook;

    LOG(("in: eb_set_font(book=%d, font_code=%d)", (int)book->code,
    (int)font_code));

    /*
     * Check `font_code'.
     */
    if (font_code < 0 || EB_MAX_FONTS <= font_code) {
    error_code = EB_ERR_NO_SUCH_FONT;
    goto failed;
    }

    /*
     * Current subbook must have been set.
     */
    subbook = book->subbook_current;
    if (subbook == NULL) {
    error_code = EB_ERR_NO_CUR_SUB;
    goto failed;
    }

    /*
     * If the current font is the font with `font_code', return immediately.
     * Otherwise close the current font and continue.
     */
    if (subbook->narrow_current != NULL) {
    if (subbook->narrow_current->font_code == font_code)
        goto succeeded;
    if (book->disc_code == EB_DISC_EPWING)
        zio_close(&subbook->narrow_current->zio);
    subbook->narrow_current = NULL;
    }
    if (subbook->wide_current != NULL) {
    if (subbook->wide_current->font_code == font_code)
        goto succeeded;
    if (book->disc_code == EB_DISC_EPWING)
        zio_close(&subbook->wide_current->zio);
    subbook->wide_current = NULL;
    }

    /*
     * Set the current font.
     */
    if (subbook->narrow_fonts[font_code].font_code != EB_FONT_INVALID)
    subbook->narrow_current = subbook->narrow_fonts + font_code;
    if (subbook->wide_fonts[font_code].font_code != EB_FONT_INVALID)
    subbook->wide_current = subbook->wide_fonts + font_code;

    if (subbook->narrow_current == NULL && subbook->wide_current == NULL) {
    error_code = EB_ERR_NO_SUCH_FONT;
    goto failed;
    }

    /*
     * Initialize current font informtaion.
     */
    if (subbook->narrow_current != NULL) {
    error_code = eb_open_narrow_font_file(book, font_code);
    if (error_code != EB_SUCCESS)
        goto failed;
    }
    if (subbook->wide_current != NULL) {
    error_code = eb_open_wide_font_file(book, font_code);
    if (error_code != EB_SUCCESS)
        goto failed;
    }


  succeeded:
    LOG(("out: eb_set_font() = %s", eb_error_string(EB_SUCCESS)));

    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    eb_unset_font(book);
    LOG(("out: eb_set_font() = %s", eb_error_string(error_code)));
    return error_code;
}


/*
 * Unset the font in the current subbook in `book'.
 */
void
eb_unset_font(EB_Book *book)
{
    EB_Subbook *subbook;

    LOG(("in: eb_unset_font(book=%d)", (int)book->code));

    subbook = book->subbook_current;

    if (subbook == NULL)
    goto succeeded;

    /*
     * Close font files.
     */
    if (subbook->narrow_current != NULL) {
    zio_close(&subbook->narrow_current->zio);
    if (subbook->narrow_current->glyphs != NULL) {
        free(subbook->narrow_current->glyphs);
        subbook->narrow_current->glyphs = NULL;
    }
    }
    if (subbook->wide_current != NULL) {
    zio_close(&subbook->wide_current->zio);
    if (subbook->wide_current->glyphs != NULL) {
        free(subbook->wide_current->glyphs);
        subbook->wide_current->glyphs = NULL;
    }
    }

    book->subbook_current->narrow_current = NULL;
    book->subbook_current->wide_current = NULL;

  succeeded:
    LOG(("out: eb_unset_font()"));
}


/*
 * Make a list of fonts in the current subbook in `book'.
 */
EB_Error_Code
eb_font_list(EB_Book *book, EB_Font_Code *font_list, int *font_count)
{
    EB_Error_Code error_code;
    EB_Subbook *subbook;
    EB_Font_Code *list_p;
    int i;

    LOG(("in: eb_font_list(book=%d)", (int)book->code));

    /*
     * Current subbook must have been set.
     */
    subbook = book->subbook_current;
    if (subbook == NULL) {
    error_code = EB_ERR_NO_CUR_SUB;
    goto failed;
    }

    /*
     * Scan the font table in the book.
     */
    subbook = book->subbook_current;
    list_p = font_list;
    *font_count = 0;
    for (i = 0; i < EB_MAX_FONTS; i++) {
    if (subbook->narrow_fonts[i].font_code != EB_FONT_INVALID
        || subbook->wide_fonts[i].font_code != EB_FONT_INVALID) {
        *list_p++ = i;
        *font_count += 1;
    }
    }

    LOG(("out: eb_font(font_count=%d) = %s", *font_count,
    eb_error_string(EB_SUCCESS)));

    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    LOG(("out: eb_font_list() = %s", eb_error_string(error_code)));
    return error_code;
}


/*
 * Test whether the current subbook in `book' has a font with
 * `font_code' or not.
 */
int
eb_have_font(EB_Book *book, EB_Font_Code font_code)
{
    EB_Subbook *subbook;

    LOG(("in: eb_have_font(book=%d, font_code=%d)", (int)book->code,
    (int)font_code));

    /*
     * Check `font_code'.
     */
    if (font_code < 0 || EB_MAX_FONTS <= font_code)
    goto failed;

    /*
     * Current subbook must have been set.
     */
    subbook = book->subbook_current;
    if (subbook == NULL)
    goto failed;

    if (subbook->narrow_fonts[font_code].font_code == EB_FONT_INVALID
    && subbook->wide_fonts[font_code].font_code == EB_FONT_INVALID)
    goto failed;

    LOG(("out: eb_have_font() = %d", 1));

    return 1;

    /*
     * An error occurs...
     */
  failed:
    LOG(("out: eb_have_font() = %d", 0));
    return 0;
}


/*
 * Get height of the font `font_code' in the current subbook of `book'.
 */
EB_Error_Code
eb_font_height(EB_Book *book, int *height)
{
    EB_Error_Code error_code;
    EB_Font_Code font_code;

    LOG(("in: eb_font_height(book=%d)", (int)book->code));

    /*
     * Current subbook must have been set.
     */
    if (book->subbook_current == NULL) {
    error_code = EB_ERR_NO_CUR_SUB;
    goto failed;
    }

    /*
     * The narrow font must exist in the current subbook.
     */
    if (book->subbook_current->narrow_current != NULL)
    font_code = book->subbook_current->narrow_current->font_code;
    else if (book->subbook_current->wide_current != NULL)
    font_code = book->subbook_current->wide_current->font_code;
    else {
    error_code = EB_ERR_NO_CUR_FONT;
    goto failed;
    }

    /*
     * Calculate height.
     */
    error_code = eb_font_height2(font_code, height);
    if (error_code != EB_SUCCESS)
    goto failed;

    LOG(("out: eb_font_heigt(height=%d) = %s", *height,
    eb_error_string(EB_SUCCESS)));

    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    *height = 0;
    LOG(("out: eb_font_height() = %s", eb_error_string(error_code)));
    return error_code;
}


/*
 * Get height of the font `font_code'.
 */
EB_Error_Code
eb_font_height2(EB_Font_Code font_code, int *height)
{
    EB_Error_Code error_code;

    LOG(("in: eb_font_height2(font_code=%d)", (int)font_code));

    switch (font_code) {
    case EB_FONT_16:
    *height = EB_HEIGHT_FONT_16;
    break;
    case EB_FONT_24:
    *height = EB_HEIGHT_FONT_24;
    break;
    case EB_FONT_30:
    *height = EB_HEIGHT_FONT_30;
    break;
    case EB_FONT_48:
    *height = EB_HEIGHT_FONT_48;
    break;
    default:
    error_code = EB_ERR_NO_SUCH_FONT;
    goto failed;
    }

    LOG(("out: eb_font_heigt2(height=%d) = %s", *height,
    eb_error_string(EB_SUCCESS)));

    return EB_SUCCESS;

    /*
     * An error occurs...
     */
  failed:
    *height = 0;
    LOG(("out: eb_font_height2() = %s", eb_error_string(error_code)));
    return error_code;
}