| 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 |
| 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 |
| 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 |
| 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 | REQUEST_SIZE_MATCH(xGLXUseXFontReq); |
| 156 | |
| 157 | req = (xGLXUseXFontReq *) pc; |
| 158 | cx = __glXForceCurrent(cl, req->contextTag, &error); |
| 159 | if (!cx) { |
| 160 | return error; |
| 161 | } |
| 162 | |
| 163 | glGetIntegerv(GL_LIST_INDEX, (GLint *) ¤tListIndex); |
| 164 | if (currentListIndex != 0) { |
| 165 | /* |
| 166 | ** A display list is currently being made. It is an error |
| 167 | ** to try to make a font during another lists construction. |
| 168 | */ |
| 169 | client->errorValue = cx->id; |
| 170 | return __glXError(GLXBadContextState); |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | ** Font can actually be either the ID of a font or the ID of a GC |
| 175 | ** containing a font. |
| 176 | */ |
| 177 | |
| 178 | error = dixLookupFontable(&pFont, req->font, client, DixReadAccess); |
| 179 | if (error != Success) |
| 180 | return error; |
| 181 | |
| 182 | return MakeBitmapsFromFont(pFont, req->first, req->count, req->listBase); |
| 183 | } |