diff options
Diffstat (limited to 'engines/sci/gfx/resource/sci_font.cpp')
| -rw-r--r-- | engines/sci/gfx/resource/sci_font.cpp | 153 |
1 files changed, 153 insertions, 0 deletions
diff --git a/engines/sci/gfx/resource/sci_font.cpp b/engines/sci/gfx/resource/sci_font.cpp new file mode 100644 index 0000000000..f1ae4edb19 --- /dev/null +++ b/engines/sci/gfx/resource/sci_font.cpp @@ -0,0 +1,153 @@ +/*************************************************************************** + sci_font.c Copyright (C) 2000 Christoph Reichenbach + + + This program may be modified and copied freely according to the terms of + the GNU general public license (GPL), as long as the above copyright + notice and the licensing information contained herein are preserved. + + Please refer to www.gnu.org for licensing details. + + This work is provided AS IS, without warranty of any kind, expressed or + implied, including but not limited to the warranties of merchantibility, + noninfringement, and fitness for a specific purpose. The author will not + be held liable for any damage caused by this work or derivatives of it. + + By using this source code, you agree to the licensing terms as stated + above. + + + Please contact the maintainer for bug reports or inquiries. + + Current Maintainer: + + Christoph Reichenbach (CR) <jameson@linuxgames.com> + +***************************************************************************/ + +#include "sci/include/sci_memory.h" +#include "sci/include/gfx_system.h" +#include "sci/include/gfx_resource.h" +#include "sci/include/gfx_tools.h" + + +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*)sci_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 = get_int_16(resource + FONT_MAXCHAR_OFFSET); + font->line_height = max_height = get_int_16(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*)sci_malloc(sizeof(int) * chars_nr); + + for (i = 0; i < chars_nr; i++) { + int offset = get_int_16(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*)sci_calloc(font->char_size, chars_nr); + + for (i = 0; i < chars_nr; i++) { + int offset = get_int_16(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; +} + + |