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/* |
* Mesa 3-D graphics library |
* |
* Copyright (C) 1999-2000 Brian Paul 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 and this permission notice 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 |
* THE AUTHORS OR COPYRIGHT HOLDERS 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. |
*/ |
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/* xfonts.c -- glXUseXFont() for Mesa written by |
* Copyright (C) 1995 Thorsten.Ohl @ Physik.TH-Darmstadt.de |
*/ |
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#include "glxheader.h" |
#include "main/context.h" |
#include "main/imports.h" |
#include "xfonts.h" |
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/* Some debugging info. */ |
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#ifdef DEBUG |
#include <ctype.h> |
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int debug_xfonts = 0; |
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static void |
dump_char_struct(XCharStruct * ch, char *prefix) |
{ |
printf("%slbearing = %d, rbearing = %d, width = %d\n", |
prefix, ch->lbearing, ch->rbearing, ch->width); |
printf("%sascent = %d, descent = %d, attributes = %u\n", |
prefix, ch->ascent, ch->descent, (unsigned int) ch->attributes); |
} |
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static void |
dump_font_struct(XFontStruct * font) |
{ |
printf("ascent = %d, descent = %d\n", font->ascent, font->descent); |
printf("char_or_byte2 = (%u,%u)\n", |
font->min_char_or_byte2, font->max_char_or_byte2); |
printf("byte1 = (%u,%u)\n", font->min_byte1, font->max_byte1); |
printf("all_chars_exist = %s\n", font->all_chars_exist ? "True" : "False"); |
printf("default_char = %c (\\%03o)\n", |
(char) (isprint(font->default_char) ? font->default_char : ' '), |
font->default_char); |
dump_char_struct(&font->min_bounds, "min> "); |
dump_char_struct(&font->max_bounds, "max> "); |
#if 0 |
for (c = font->min_char_or_byte2; c <= font->max_char_or_byte2; c++) { |
char prefix[8]; |
sprintf(prefix, "%d> ", c); |
dump_char_struct(&font->per_char[c], prefix); |
} |
#endif |
} |
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static void |
dump_bitmap(unsigned int width, unsigned int height, GLubyte * bitmap) |
{ |
unsigned int x, y; |
|
printf(" "); |
for (x = 0; x < 8 * width; x++) |
printf("%o", 7 - (x % 8)); |
putchar('\n'); |
for (y = 0; y < height; y++) { |
printf("%3o:", y); |
for (x = 0; x < 8 * width; x++) |
putchar((bitmap[width * (height - y - 1) + x / 8] & (1 << (7 - (x % |
8)))) |
? '*' : '.'); |
printf(" "); |
for (x = 0; x < width; x++) |
printf("0x%02x, ", bitmap[width * (height - y - 1) + x]); |
putchar('\n'); |
} |
} |
#endif /* DEBUG */ |
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/* Implementation. */ |
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/* Fill a BITMAP with a character C from thew current font |
in the graphics context GC. WIDTH is the width in bytes |
and HEIGHT is the height in bits. |
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Note that the generated bitmaps must be used with |
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glPixelStorei (GL_UNPACK_SWAP_BYTES, GL_FALSE); |
glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE); |
glPixelStorei (GL_UNPACK_ROW_LENGTH, 0); |
glPixelStorei (GL_UNPACK_SKIP_ROWS, 0); |
glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0); |
glPixelStorei (GL_UNPACK_ALIGNMENT, 1); |
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Possible optimizations: |
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* use only one reusable pixmap with the maximum dimensions. |
* draw the entire font into a single pixmap (careful with |
proportional fonts!). |
*/ |
|
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/* |
* Generate OpenGL-compatible bitmap. |
*/ |
static void |
fill_bitmap(Display * dpy, Window win, GC gc, |
unsigned int width, unsigned int height, |
int x0, int y0, unsigned int c, GLubyte * bitmap) |
{ |
XImage *image; |
unsigned int x, y; |
Pixmap pixmap; |
XChar2b char2b; |
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pixmap = XCreatePixmap(dpy, win, 8 * width, height, 1); |
XSetForeground(dpy, gc, 0); |
XFillRectangle(dpy, pixmap, gc, 0, 0, 8 * width, height); |
XSetForeground(dpy, gc, 1); |
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char2b.byte1 = (c >> 8) & 0xff; |
char2b.byte2 = (c & 0xff); |
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XDrawString16(dpy, pixmap, gc, x0, y0, &char2b, 1); |
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image = XGetImage(dpy, pixmap, 0, 0, 8 * width, height, 1, XYPixmap); |
if (image) { |
/* Fill the bitmap (X11 and OpenGL are upside down wrt each other). */ |
for (y = 0; y < height; y++) |
for (x = 0; x < 8 * width; x++) |
if (XGetPixel(image, x, y)) |
bitmap[width * (height - y - 1) + x / 8] |= |
(1 << (7 - (x % 8))); |
XDestroyImage(image); |
} |
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XFreePixmap(dpy, pixmap); |
} |
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/* |
* determine if a given glyph is valid and return the |
* corresponding XCharStruct. |
*/ |
static XCharStruct * |
isvalid(XFontStruct * fs, unsigned int which) |
{ |
unsigned int rows, pages; |
unsigned int byte1 = 0, byte2 = 0; |
int i, valid = 1; |
|
rows = fs->max_byte1 - fs->min_byte1 + 1; |
pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1; |
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if (rows == 1) { |
/* "linear" fonts */ |
if ((fs->min_char_or_byte2 > which) || (fs->max_char_or_byte2 < which)) |
valid = 0; |
} |
else { |
/* "matrix" fonts */ |
byte2 = which & 0xff; |
byte1 = which >> 8; |
if ((fs->min_char_or_byte2 > byte2) || |
(fs->max_char_or_byte2 < byte2) || |
(fs->min_byte1 > byte1) || (fs->max_byte1 < byte1)) |
valid = 0; |
} |
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if (valid) { |
if (fs->per_char) { |
if (rows == 1) { |
/* "linear" fonts */ |
return (fs->per_char + (which - fs->min_char_or_byte2)); |
} |
else { |
/* "matrix" fonts */ |
i = ((byte1 - fs->min_byte1) * pages) + |
(byte2 - fs->min_char_or_byte2); |
return (fs->per_char + i); |
} |
} |
else { |
return (&fs->min_bounds); |
} |
} |
return (NULL); |
} |
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void |
Fake_glXUseXFont(Font font, int first, int count, int listbase) |
{ |
Display *dpy; |
Window win; |
Pixmap pixmap; |
GC gc; |
XGCValues values; |
unsigned long valuemask; |
XFontStruct *fs; |
GLint swapbytes, lsbfirst, rowlength; |
GLint skiprows, skippixels, alignment; |
unsigned int max_width, max_height, max_bm_width, max_bm_height; |
GLubyte *bm; |
int i; |
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dpy = glXGetCurrentDisplay(); |
if (!dpy) |
return; /* I guess glXMakeCurrent wasn't called */ |
win = RootWindow(dpy, DefaultScreen(dpy)); |
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fs = XQueryFont(dpy, font); |
if (!fs) { |
_mesa_error(NULL, GL_INVALID_VALUE, |
"Couldn't get font structure information"); |
return; |
} |
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/* Allocate a bitmap that can fit all characters. */ |
max_width = fs->max_bounds.rbearing - fs->min_bounds.lbearing; |
max_height = fs->max_bounds.ascent + fs->max_bounds.descent; |
max_bm_width = (max_width + 7) / 8; |
max_bm_height = max_height; |
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bm = malloc((max_bm_width * max_bm_height) * sizeof(GLubyte)); |
if (!bm) { |
XFreeFontInfo(NULL, fs, 1); |
_mesa_error(NULL, GL_OUT_OF_MEMORY, |
"Couldn't allocate bitmap in glXUseXFont()"); |
return; |
} |
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#if 0 |
/* get the page info */ |
pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1; |
firstchar = (fs->min_byte1 << 8) + fs->min_char_or_byte2; |
lastchar = (fs->max_byte1 << 8) + fs->max_char_or_byte2; |
rows = fs->max_byte1 - fs->min_byte1 + 1; |
unsigned int first_char, last_char, pages, rows; |
#endif |
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/* Save the current packing mode for bitmaps. */ |
glGetIntegerv(GL_UNPACK_SWAP_BYTES, &swapbytes); |
glGetIntegerv(GL_UNPACK_LSB_FIRST, &lsbfirst); |
glGetIntegerv(GL_UNPACK_ROW_LENGTH, &rowlength); |
glGetIntegerv(GL_UNPACK_SKIP_ROWS, &skiprows); |
glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &skippixels); |
glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment); |
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/* Enforce a standard packing mode which is compatible with |
fill_bitmap() from above. This is actually the default mode, |
except for the (non)alignment. */ |
glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE); |
glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE); |
glPixelStorei(GL_UNPACK_ROW_LENGTH, 0); |
glPixelStorei(GL_UNPACK_SKIP_ROWS, 0); |
glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0); |
glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
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pixmap = XCreatePixmap(dpy, win, 10, 10, 1); |
values.foreground = BlackPixel(dpy, DefaultScreen(dpy)); |
values.background = WhitePixel(dpy, DefaultScreen(dpy)); |
values.font = fs->fid; |
valuemask = GCForeground | GCBackground | GCFont; |
gc = XCreateGC(dpy, pixmap, valuemask, &values); |
XFreePixmap(dpy, pixmap); |
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#ifdef DEBUG |
if (debug_xfonts) |
dump_font_struct(fs); |
#endif |
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for (i = 0; i < count; i++) { |
unsigned int width, height, bm_width, bm_height; |
GLfloat x0, y0, dx, dy; |
XCharStruct *ch; |
int x, y; |
unsigned int c = first + i; |
int list = listbase + i; |
int valid; |
|
/* check on index validity and get the bounds */ |
ch = isvalid(fs, c); |
if (!ch) { |
ch = &fs->max_bounds; |
valid = 0; |
} |
else { |
valid = 1; |
} |
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#ifdef DEBUG |
if (debug_xfonts) { |
char s[7]; |
sprintf(s, isprint(c) ? "%c> " : "\\%03o> ", c); |
dump_char_struct(ch, s); |
} |
#endif |
|
/* glBitmap()' parameters: |
straight from the glXUseXFont(3) manpage. */ |
width = ch->rbearing - ch->lbearing; |
height = ch->ascent + ch->descent; |
x0 = -ch->lbearing; |
y0 = ch->descent - 0; /* XXX used to subtract 1 here */ |
/* but that caused a conformace failure */ |
dx = ch->width; |
dy = 0; |
|
/* X11's starting point. */ |
x = -ch->lbearing; |
y = ch->ascent; |
|
/* Round the width to a multiple of eight. We will use this also |
for the pixmap for capturing the X11 font. This is slightly |
inefficient, but it makes the OpenGL part real easy. */ |
bm_width = (width + 7) / 8; |
bm_height = height; |
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glNewList(list, GL_COMPILE); |
if (valid && (bm_width > 0) && (bm_height > 0)) { |
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memset(bm, '\0', bm_width * bm_height); |
fill_bitmap(dpy, win, gc, bm_width, bm_height, x, y, c, bm); |
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glBitmap(width, height, x0, y0, dx, dy, bm); |
#ifdef DEBUG |
if (debug_xfonts) { |
printf("width/height = %u/%u\n", width, height); |
printf("bm_width/bm_height = %u/%u\n", bm_width, bm_height); |
dump_bitmap(bm_width, bm_height, bm); |
} |
#endif |
} |
else { |
glBitmap(0, 0, 0.0, 0.0, dx, dy, NULL); |
} |
glEndList(); |
} |
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free(bm); |
XFreeFontInfo(NULL, fs, 1); |
XFreeGC(dpy, gc); |
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/* Restore saved packing modes. */ |
glPixelStorei(GL_UNPACK_SWAP_BYTES, swapbytes); |
glPixelStorei(GL_UNPACK_LSB_FIRST, lsbfirst); |
glPixelStorei(GL_UNPACK_ROW_LENGTH, rowlength); |
glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows); |
glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels); |
glPixelStorei(GL_UNPACK_ALIGNMENT, alignment); |
} |