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Kaleb Keithley 2003-11-14 16:48:57 +00:00
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/* $XFree86: xc/programs/Xserver/GL/glx/xfont.c,v 1.3 2001/03/21 16:29:37 dawes Exp $ */
/*
** License Applicability. Except to the extent portions of this file are
** made subject to an alternative license as permitted in the SGI Free
** Software License B, Version 1.1 (the "License"), the contents of this
** file are subject only to the provisions of the License. You may not use
** this file except in compliance with the License. You may obtain a copy
** of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
** Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
**
** http://oss.sgi.com/projects/FreeB
**
** Note that, as provided in the License, the Software is distributed on an
** "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
** DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
** CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
** PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
**
** Original Code. The Original Code is: OpenGL Sample Implementation,
** Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
** Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
** Copyright in any portions created by third parties is as indicated
** elsewhere herein. All Rights Reserved.
**
** Additional Notice Provisions: The application programming interfaces
** established by SGI in conjunction with the Original Code are The
** OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
** April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
** 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
** Window System(R) (Version 1.3), released October 19, 1998. This software
** was created using the OpenGL(R) version 1.2.1 Sample Implementation
** published by SGI, but has not been independently verified as being
** compliant with the OpenGL(R) version 1.2.1 Specification.
**
*/
#define NEED_REPLIES
#include "glxserver.h"
#include "glxutil.h"
#include "g_disptab.h"
#include <unpack.h>
#include <GL/gl.h>
#include <pixmapstr.h>
#include <windowstr.h>
#include <dixfontstr.h>
extern XID clientErrorValue; /* imported kludge from dix layer */
/*
** Make a single GL bitmap from a single X glyph
*/
static int __glXMakeBitmapFromGlyph(FontPtr font, CharInfoPtr pci)
{
int i, j;
int widthPadded; /* width of glyph in bytes, as padded by X */
int allocBytes; /* bytes to allocate to store bitmap */
int w; /* width of glyph in bits */
int h; /* height of glyph */
register unsigned char *pglyph;
register unsigned char *p;
unsigned char *allocbuf;
#define __GL_CHAR_BUF_SIZE 2048
unsigned char buf[__GL_CHAR_BUF_SIZE];
w = GLYPHWIDTHPIXELS(pci);
h = GLYPHHEIGHTPIXELS(pci);
widthPadded = GLYPHWIDTHBYTESPADDED(pci);
/*
** Use the local buf if possible, otherwise malloc.
*/
allocBytes = widthPadded * h;
if (allocBytes <= __GL_CHAR_BUF_SIZE) {
p = buf;
allocbuf = 0;
} else {
p = (unsigned char *) __glXMalloc(allocBytes);
if (!p)
return BadAlloc;
allocbuf = p;
}
/*
** We have to reverse the picture, top to bottom
*/
pglyph = FONTGLYPHBITS(FONTGLYPHS(font), pci) + (h-1)*widthPadded;
for (j=0; j < h; j++) {
for (i=0; i < widthPadded; i++) {
p[i] = pglyph[i];
}
pglyph -= widthPadded;
p += widthPadded;
}
glBitmap(w, h, -pci->metrics.leftSideBearing, pci->metrics.descent,
pci->metrics.characterWidth, 0, allocbuf ? allocbuf : buf);
if (allocbuf) {
__glXFree(allocbuf);
}
return Success;
#undef __GL_CHAR_BUF_SIZE
}
/*
** Create a GL bitmap for each character in the X font. The bitmap is stored
** in a display list.
*/
static int
MakeBitmapsFromFont(FontPtr pFont, int first, int count, int list_base)
{
unsigned long i, nglyphs;
CARD8 chs[2]; /* the font index we are going after */
CharInfoPtr pci;
int rv; /* return value */
int encoding = (FONTLASTROW(pFont) == 0) ? Linear16Bit : TwoD16Bit;
glPixelStorei(GL_UNPACK_SWAP_BYTES, FALSE);
glPixelStorei(GL_UNPACK_LSB_FIRST, BITMAP_BIT_ORDER == LSBFirst);
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
glPixelStorei(GL_UNPACK_ALIGNMENT, GLYPHPADBYTES);
for (i=0; i < count; i++) {
chs[0] = (first + i) >> 8; /* high byte is first byte */
chs[1] = first + i;
(*pFont->get_glyphs)(pFont, 1, chs, (FontEncoding)encoding,
&nglyphs, &pci);
/*
** Define a display list containing just a glBitmap() call.
*/
glNewList(list_base + i, GL_COMPILE);
if (nglyphs ) {
rv = __glXMakeBitmapFromGlyph(pFont, pci);
if (rv) {
return rv;
}
}
glEndList();
}
return Success;
}
/************************************************************************/
int __glXUseXFont(__GLXclientState *cl, GLbyte *pc)
{
ClientPtr client = cl->client;
xGLXUseXFontReq *req;
FontPtr pFont;
GC *pGC;
GLuint currentListIndex;
__GLXcontext *cx;
int error;
req = (xGLXUseXFontReq *) pc;
cx = __glXForceCurrent(cl, req->contextTag, &error);
if (!cx) {
return error;
}
glGetIntegerv(GL_LIST_INDEX, (GLint*) &currentListIndex);
if (currentListIndex != 0) {
/*
** A display list is currently being made. It is an error
** to try to make a font during another lists construction.
*/
client->errorValue = cx->id;
return __glXBadContextState;
}
/*
** Font can actually be either the ID of a font or the ID of a GC
** containing a font.
*/
pFont = (FontPtr)LookupIDByType(req->font, RT_FONT);
if (!pFont) {
pGC = (GC *)LookupIDByType(req->font, RT_GC);
if (!pGC) {
client->errorValue = req->font;
return BadFont;
}
pFont = pGC->font;
}
return MakeBitmapsFromFont(pFont, req->first, req->count,
req->listBase);
}