mirror of
https://github.com/cc65/cc65.git
synced 2024-11-05 08:05:51 +00:00
138 lines
5.0 KiB
C
138 lines
5.0 KiB
C
/*****************************************************************************/
|
|
/* */
|
|
/* tgi_load_vectorfont.c */
|
|
/* */
|
|
/* Loader module for TGI vector font files */
|
|
/* */
|
|
/* */
|
|
/* */
|
|
/* (C) 2009, Ullrich von Bassewitz */
|
|
/* Roemerstrasse 52 */
|
|
/* D-70794 Filderstadt */
|
|
/* EMail: uz@cc65.org */
|
|
/* */
|
|
/* */
|
|
/* This software is provided 'as-is', without any expressed or implied */
|
|
/* warranty. In no event will the authors be held liable for any damages */
|
|
/* arising from the use of this software. */
|
|
/* */
|
|
/* Permission is granted to anyone to use this software for any purpose, */
|
|
/* including commercial applications, and to alter it and redistribute it */
|
|
/* freely, subject to the following restrictions: */
|
|
/* */
|
|
/* 1. The origin of this software must not be misrepresented; you must not */
|
|
/* claim that you wrote the original software. If you use this software */
|
|
/* in a product, an acknowledgment in the product documentation would be */
|
|
/* appreciated but is not required. */
|
|
/* 2. Altered source versions must be plainly marked as such, and must not */
|
|
/* be misrepresented as being the original software. */
|
|
/* 3. This notice may not be removed or altered from any source */
|
|
/* distribution. */
|
|
/* */
|
|
/*****************************************************************************/
|
|
|
|
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
|
|
#include <tgi.h>
|
|
#include <tgi/tgi-kernel.h>
|
|
#include <tgi/tgi-vectorfont.h>
|
|
|
|
|
|
|
|
/*****************************************************************************/
|
|
/* Code */
|
|
/*****************************************************************************/
|
|
|
|
|
|
|
|
const tgi_vectorfont* __fastcall__ tgi_load_vectorfont (const char* name)
|
|
/* Load a vector font into memory and return it. In case of errors, NULL is
|
|
** returned and an error is set, which can be retrieved using tgi_geterror.
|
|
** To use the font, it has to be installed using tgi_install_vectorfont.
|
|
*/
|
|
{
|
|
static const char Magic[4] = {
|
|
0x54, 0x43, 0x48, TGI_VF_VERSION
|
|
};
|
|
|
|
tgi_vectorfont_header H;
|
|
int F;
|
|
tgi_vectorfont* Font = 0;
|
|
unsigned V;
|
|
unsigned char I;
|
|
|
|
|
|
/* Assume we have an error loading the font */
|
|
tgi_error = TGI_ERR_CANNOT_LOAD;
|
|
|
|
/* Open the file */
|
|
F = open (name, O_RDONLY);
|
|
if (F < 0) {
|
|
/* Cannot open file */
|
|
goto LoadError;
|
|
}
|
|
|
|
/* Read the header */
|
|
if (read (F, &H, sizeof (H)) != sizeof (H)) {
|
|
/* Cannot read header bytes */
|
|
goto LoadError;
|
|
}
|
|
|
|
/* Check the header */
|
|
if (memcmp (&H, Magic, sizeof (Magic)) != 0) {
|
|
/* Header magic not ok */
|
|
goto LoadError;
|
|
}
|
|
|
|
/* Allocate memory for the data */
|
|
Font = malloc (H.size);
|
|
if (Font == 0) {
|
|
/* Out of memory */
|
|
tgi_error = TGI_ERR_NO_RES;
|
|
goto LoadError;
|
|
}
|
|
|
|
/* Read the whole font file into the buffer */
|
|
if (read (F, Font, H.size) != H.size) {
|
|
/* Problem reading font data */
|
|
free (Font);
|
|
goto LoadError;
|
|
}
|
|
|
|
/* Close the file */
|
|
close (F);
|
|
|
|
/* Fix the offset pointers. When loaded, they contain numeric offsets
|
|
** into the VectorOps, with the start of the VectorOps at offset zero.
|
|
** We will add a pointer to the VectorOps to make them actual pointers
|
|
** that may be used independently from anything else.
|
|
*/
|
|
V = (unsigned) &Font->vec_ops;
|
|
for (I = 0; I < TGI_VF_CCOUNT; ++I) {
|
|
Font->chars[I] += V;
|
|
}
|
|
|
|
/* Clear the error */
|
|
tgi_error = TGI_ERR_OK;
|
|
|
|
/* Return the vector font loaded */
|
|
return Font;
|
|
|
|
LoadError:
|
|
/* Some sort of load problem. If the file is still open, be sure to
|
|
** close it
|
|
*/
|
|
if (F >= 0) {
|
|
close (F);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
|