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Diffstat (limited to 'GL/glx/xfont.c')
| -rw-r--r-- | GL/glx/xfont.c | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/GL/glx/xfont.c b/GL/glx/xfont.c new file mode 100644 index 000000000..3ea767d2b --- /dev/null +++ b/GL/glx/xfont.c @@ -0,0 +1,191 @@ +/* $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*) ¤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 __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); +} |