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/*
* SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
* Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice including the dates of first publication and
* either this permission notice or a reference to
* http://oss.sgi.com/projects/FreeB/
* shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Except as contained in this notice, the name of Silicon Graphics, Inc.
* shall not be used in advertising or otherwise to promote the sale, use or
* other dealings in this Software without prior written authorization from
* Silicon Graphics, Inc.
*/
#ifdef HAVE_DIX_CONFIG_H
#include <dix-config.h>
#endif
#include "glxserver.h"
#include "glxutil.h"
#include "unpack.h"
#include "indirect_dispatch.h"
#include <GL/gl.h>
#include <pixmapstr.h>
#include <windowstr.h>
#include <dixfontstr.h>
/*
** 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 *) malloc(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);
free(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
__glXDisp_UseXFont(__GLXclientState * cl, GLbyte * pc)
{
ClientPtr client = cl->client;
xGLXUseXFontReq *req;
FontPtr pFont;
GLuint currentListIndex;
__GLXcontext *cx;
int error;
REQUEST_SIZE_MATCH(xGLXUseXFontReq);
req = (xGLXUseXFontReq *) pc;
cx = __glXForceCurrent(cl, req->contextTag, &error);
if (!cx) {
return error;
}
glGetIntegerv(GL_LIST_INDEX, (GLint *) ¤tListIndex);
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 __glXError(GLXBadContextState);
}
/*
** Font can actually be either the ID of a font or the ID of a GC
** containing a font.
*/
error = dixLookupFontable(&pFont, req->font, client, DixReadAccess);
if (error != Success)
return error;
return MakeBitmapsFromFont(pFont, req->first, req->count, req->listBase);
}
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