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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* $URL$
* $Id$
*
*/
#include "sci/gfx/gfx_system.h"
#include "sci/gfx/gfx_resource.h"
#include "sci/gfx/gfx_tools.h"
#include "sci/gfx/font.h"
namespace Sci {
extern int font_counter;
#define FONT_HEIGHT_OFFSET 4
#define FONT_MAXCHAR_OFFSET 2
static int calc_char(byte *dest, int total_width, int total_height, byte *src, int size) {
int width = src[0];
int height = src[1];
int byte_width = (width + 7) >> 3;
int y;
src += 2;
if ((width >> 3) > total_width || height > total_height) {
GFXERROR("Weird character: width=%d/%d, height=%d/%d\n", width, total_width, height, total_height);
return GFX_ERROR;
}
if (byte_width * height + 2 > size) {
GFXERROR("Character extends to %d of %d allowed bytes\n", byte_width * height + 2, size);
return GFX_ERROR;
}
for (y = 0; y < height; y++) {
memcpy(dest, src, byte_width);
src += byte_width;
dest += total_width;
}
return GFX_OK;
}
gfx_bitmap_font_t *gfxr_read_font(int id, byte *resource, int size) {
gfx_bitmap_font_t *font = (gfx_bitmap_font_t*)calloc(sizeof(gfx_bitmap_font_t), 1);
int chars_nr;
int max_width = 0, max_height;
int i;
++font_counter;
if (size < 6) {
GFXERROR("Font %04x size is %d- this is a joke, right?\n", id, size);
gfxr_free_font(font);
return NULL;
}
font->chars_nr = chars_nr = READ_LE_UINT16(resource + FONT_MAXCHAR_OFFSET);
font->line_height = max_height = READ_LE_UINT16(resource + FONT_HEIGHT_OFFSET);
if (chars_nr < 0 || chars_nr > 256 || max_height < 0) {
if (chars_nr < 0 || chars_nr > 256)
GFXERROR("Font %04x: Invalid number of characters: %d\n", id, chars_nr);
if (max_height < 0)
GFXERROR("Font %04x: Invalid font height: %d\n", id, max_height);
gfxr_free_font(font);
return NULL;
}
if (size < 6 + chars_nr * 2) {
GFXERROR("Font %04x: Insufficient space for %d characters in font\n", id, chars_nr);
gfxr_free_font(font);
return NULL;
}
font->ID = id;
font->widths = (int*)malloc(sizeof(int) * chars_nr);
for (i = 0; i < chars_nr; i++) {
int offset = READ_LE_UINT16(resource + (i << 1) + 6);
if (offset >= size) {
GFXERROR("Font %04x: Error: Character 0x%02x is at offset 0x%04x (beyond 0x%04x)\n", id, i, offset, size);
gfxr_free_font(font);
return NULL;
}
if ((resource[offset]) > max_width)
max_width = resource[offset];
if ((resource[offset + 1]) > max_height)
max_height = resource[offset + 1];
font->widths[i] = resource[offset];
}
font->height = max_height;
font->row_size = (max_width + 7) >> 3;
if (font->row_size == 3)
font->row_size = 4;
if (font->row_size > 4)
font->row_size = (font->row_size + 3) & ~3;
font->char_size = font->row_size * max_height;
font->data = (byte *)calloc(font->char_size, chars_nr);
for (i = 0; i < chars_nr; i++) {
int offset = READ_LE_UINT16(resource + (i << 1) + 6);
if (calc_char(font->data + (font->char_size * i), font->row_size, max_height, resource + offset, size - offset)) {
GFXERROR("Problem occured in font %04x, char %d/%d\n", id, i, chars_nr);
gfxr_free_font(font);
return NULL;
}
}
return font;
}
} // End of namespace Sci
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