1 /*
2 * SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008)
3 * Copyright (C) 1991-2000 Silicon Graphics, Inc. All Rights Reserved.
4 *
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
11 *
12 * The above copyright notice including the dates of first publication and
13 * either this permission notice or a reference to
14 * http://oss.sgi.com/projects/FreeB/
15 * shall be included in all copies or substantial portions of the Software.
16 *
17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
18 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
20 * SILICON GRAPHICS, INC. BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
21 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF
22 * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
23 * SOFTWARE.
24 *
25 * Except as contained in this notice, the name of Silicon Graphics, Inc.
26 * shall not be used in advertising or otherwise to promote the sale, use or
27 * other dealings in this Software without prior written authorization from
28 * Silicon Graphics, Inc.
29 */
30
31 #ifdef HAVE_DIX_CONFIG_H
32 #include <dix-config.h>
33 #endif
34
35 #include "glxserver.h"
36 #include "glxutil.h"
37 #include "unpack.h"
38 #include "indirect_dispatch.h"
39 #include <GL/gl.h>
40 #include <pixmapstr.h>
41 #include <windowstr.h>
42 #include <dixfontstr.h>
43
44 /*
45 ** Make a single GL bitmap from a single X glyph
46 */
47 static int
__glXMakeBitmapFromGlyph(FontPtr font,CharInfoPtr pci)48 __glXMakeBitmapFromGlyph(FontPtr font, CharInfoPtr pci)
49 {
50 int i, j;
51 int widthPadded; /* width of glyph in bytes, as padded by X */
52 int allocBytes; /* bytes to allocate to store bitmap */
53 int w; /* width of glyph in bits */
54 int h; /* height of glyph */
55 register unsigned char *pglyph;
56 register unsigned char *p;
57 unsigned char *allocbuf;
58
59 #define __GL_CHAR_BUF_SIZE 2048
60 unsigned char buf[__GL_CHAR_BUF_SIZE];
61
62 w = GLYPHWIDTHPIXELS(pci);
63 h = GLYPHHEIGHTPIXELS(pci);
64 widthPadded = GLYPHWIDTHBYTESPADDED(pci);
65
66 /*
67 ** Use the local buf if possible, otherwise malloc.
68 */
69 allocBytes = widthPadded * h;
70 if (allocBytes <= __GL_CHAR_BUF_SIZE) {
71 p = buf;
72 allocbuf = 0;
73 }
74 else {
75 p = (unsigned char *) malloc(allocBytes);
76 if (!p)
77 return BadAlloc;
78 allocbuf = p;
79 }
80
81 /*
82 ** We have to reverse the picture, top to bottom
83 */
84
85 pglyph = FONTGLYPHBITS(FONTGLYPHS(font), pci) + (h - 1) * widthPadded;
86 for (j = 0; j < h; j++) {
87 for (i = 0; i < widthPadded; i++) {
88 p[i] = pglyph[i];
89 }
90 pglyph -= widthPadded;
91 p += widthPadded;
92 }
93 glBitmap(w, h, -pci->metrics.leftSideBearing, pci->metrics.descent,
94 pci->metrics.characterWidth, 0, allocbuf ? allocbuf : buf);
95
96 free(allocbuf);
97 return Success;
98 #undef __GL_CHAR_BUF_SIZE
99 }
100
101 /*
102 ** Create a GL bitmap for each character in the X font. The bitmap is stored
103 ** in a display list.
104 */
105
106 static int
MakeBitmapsFromFont(FontPtr pFont,int first,int count,int list_base)107 MakeBitmapsFromFont(FontPtr pFont, int first, int count, int list_base)
108 {
109 unsigned long i, nglyphs;
110 CARD8 chs[2]; /* the font index we are going after */
111 CharInfoPtr pci;
112 int rv; /* return value */
113 int encoding = (FONTLASTROW(pFont) == 0) ? Linear16Bit : TwoD16Bit;
114
115 glPixelStorei(GL_UNPACK_SWAP_BYTES, FALSE);
116 glPixelStorei(GL_UNPACK_LSB_FIRST, BITMAP_BIT_ORDER == LSBFirst);
117 glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
118 glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
119 glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
120 glPixelStorei(GL_UNPACK_ALIGNMENT, GLYPHPADBYTES);
121 for (i = 0; i < count; i++) {
122 chs[0] = (first + i) >> 8; /* high byte is first byte */
123 chs[1] = first + i;
124
125 (*pFont->get_glyphs) (pFont, 1, chs, (FontEncoding) encoding,
126 &nglyphs, &pci);
127
128 /*
129 ** Define a display list containing just a glBitmap() call.
130 */
131 glNewList(list_base + i, GL_COMPILE);
132 if (nglyphs) {
133 rv = __glXMakeBitmapFromGlyph(pFont, pci);
134 if (rv) {
135 return rv;
136 }
137 }
138 glEndList();
139 }
140 return Success;
141 }
142
143 /************************************************************************/
144
145 int
__glXDisp_UseXFont(__GLXclientState * cl,GLbyte * pc)146 __glXDisp_UseXFont(__GLXclientState * cl, GLbyte * pc)
147 {
148 ClientPtr client = cl->client;
149 xGLXUseXFontReq *req;
150 FontPtr pFont;
151 GLuint currentListIndex;
152 __GLXcontext *cx;
153 int error;
154
155 req = (xGLXUseXFontReq *) pc;
156 cx = __glXForceCurrent(cl, req->contextTag, &error);
157 if (!cx) {
158 return error;
159 }
160
161 glGetIntegerv(GL_LIST_INDEX, (GLint *) ¤tListIndex);
162 if (currentListIndex != 0) {
163 /*
164 ** A display list is currently being made. It is an error
165 ** to try to make a font during another lists construction.
166 */
167 client->errorValue = cx->id;
168 return __glXError(GLXBadContextState);
169 }
170
171 /*
172 ** Font can actually be either the ID of a font or the ID of a GC
173 ** containing a font.
174 */
175
176 error = dixLookupFontable(&pFont, req->font, client, DixReadAccess);
177 if (error != Success)
178 return error;
179
180 return MakeBitmapsFromFont(pFont, req->first, req->count, req->listBase);
181 }
182