[18882] | 1 | /* Copyright (c) 2001, Stanford University
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| 2 | * All rights reserved
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| 3 | *
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| 4 | * See the file LICENSE.txt for information on redistributing this software.
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| 5 | */
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| 6 |
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| 7 | #include "chromium.h"
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| 8 | #include "cr_error.h"
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| 9 | #include "cr_mem.h"
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| 10 | #include "stub.h"
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| 11 |
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| 12 | /** code borrowed from Mesa */
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| 13 |
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| 14 |
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| 15 | /** Fill a BITMAP with a character C from thew current font
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| 16 | in the graphics context GC. WIDTH is the width in bytes
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| 17 | and HEIGHT is the height in bits.
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| 18 |
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| 19 | Note that the generated bitmaps must be used with
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| 20 |
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| 21 | glPixelStorei (GL_UNPACK_SWAP_BYTES, GL_FALSE);
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| 22 | glPixelStorei (GL_UNPACK_LSB_FIRST, GL_FALSE);
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| 23 | glPixelStorei (GL_UNPACK_ROW_LENGTH, 0);
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| 24 | glPixelStorei (GL_UNPACK_SKIP_ROWS, 0);
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| 25 | glPixelStorei (GL_UNPACK_SKIP_PIXELS, 0);
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| 26 | glPixelStorei (GL_UNPACK_ALIGNMENT, 1);
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| 27 |
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| 28 | Possible optimizations:
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| 29 |
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| 30 | * use only one reusable pixmap with the maximum dimensions.
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| 31 | * draw the entire font into a single pixmap (careful with
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| 32 | proportional fonts!).
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| 33 | */
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| 34 |
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| 35 |
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| 36 | /**
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| 37 | * Generate OpenGL-compatible bitmap.
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| 38 | */
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| 39 | static void
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| 40 | fill_bitmap(Display *dpy, Window win, GC gc,
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| 41 | unsigned int width, unsigned int height,
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| 42 | int x0, int y0, unsigned int c, GLubyte *bitmap)
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| 43 | {
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| 44 | XImage *image;
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| 45 | unsigned int x, y;
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| 46 | Pixmap pixmap;
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| 47 | XChar2b char2b;
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| 48 |
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| 49 | pixmap = XCreatePixmap(dpy, win, 8*width, height, 1);
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| 50 | XSetForeground(dpy, gc, 0);
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| 51 | XFillRectangle(dpy, pixmap, gc, 0, 0, 8*width, height);
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| 52 | XSetForeground(dpy, gc, 1);
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| 53 |
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| 54 | char2b.byte1 = (c >> 8) & 0xff;
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| 55 | char2b.byte2 = (c & 0xff);
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| 56 |
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| 57 | XDrawString16(dpy, pixmap, gc, x0, y0, &char2b, 1);
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| 58 |
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| 59 | image = XGetImage(dpy, pixmap, 0, 0, 8*width, height, 1, XYPixmap);
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| 60 | if (image) {
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| 61 | /* Fill the bitmap (X11 and OpenGL are upside down wrt each other). */
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| 62 | for (y = 0; y < height; y++)
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| 63 | for (x = 0; x < 8*width; x++)
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| 64 | if (XGetPixel(image, x, y))
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| 65 | bitmap[width*(height - y - 1) + x/8] |= (1 << (7 - (x % 8)));
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| 66 | XDestroyImage(image);
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| 67 | }
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| 68 |
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| 69 | XFreePixmap(dpy, pixmap);
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| 70 | }
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| 71 |
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| 72 | /*
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| 73 | * determine if a given glyph is valid and return the
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| 74 | * corresponding XCharStruct.
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| 75 | */
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| 76 | static XCharStruct *isvalid(XFontStruct *fs, unsigned int which)
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| 77 | {
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| 78 | unsigned int rows, pages;
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| 79 | unsigned int byte1 = 0, byte2 = 0;
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| 80 | int i, valid = 1;
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| 81 |
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| 82 | rows = fs->max_byte1 - fs->min_byte1 + 1;
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| 83 | pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1;
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| 84 |
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| 85 | if (rows == 1) {
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| 86 | /* "linear" fonts */
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| 87 | if ((fs->min_char_or_byte2 > which) ||
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| 88 | (fs->max_char_or_byte2 < which)) valid = 0;
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| 89 | }
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| 90 | else {
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| 91 | /* "matrix" fonts */
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| 92 | byte2 = which & 0xff;
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| 93 | byte1 = which >> 8;
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| 94 | if ((fs->min_char_or_byte2 > byte2) ||
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| 95 | (fs->max_char_or_byte2 < byte2) ||
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| 96 | (fs->min_byte1 > byte1) ||
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| 97 | (fs->max_byte1 < byte1)) valid = 0;
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| 98 | }
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| 99 |
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| 100 | if (valid) {
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| 101 | if (fs->per_char) {
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| 102 | if (rows == 1) {
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| 103 | /* "linear" fonts */
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| 104 | return fs->per_char + (which-fs->min_char_or_byte2);
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| 105 | }
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| 106 | else {
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| 107 | /* "matrix" fonts */
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| 108 | i = ((byte1 - fs->min_byte1) * pages) +
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| 109 | (byte2 - fs->min_char_or_byte2);
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| 110 | return fs->per_char + i;
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| 111 | }
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| 112 | }
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| 113 | else {
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| 114 | return &fs->min_bounds;
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| 115 | }
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| 116 | }
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| 117 | return NULL;
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| 118 | }
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| 119 |
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| 120 |
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| 121 | void stubUseXFont( Display *dpy, Font font, int first, int count, int listbase )
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| 122 | {
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| 123 | Window win;
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| 124 | Pixmap pixmap;
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| 125 | GC gc;
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| 126 | XGCValues values;
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| 127 | unsigned long valuemask;
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| 128 | XFontStruct *fs;
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| 129 | GLint swapbytes, lsbfirst, rowlength;
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| 130 | GLint skiprows, skippixels, alignment;
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| 131 | unsigned int max_width, max_height, max_bm_width, max_bm_height;
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| 132 | GLubyte *bm;
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| 133 | int i;
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| 134 |
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| 135 | win = RootWindow(dpy, DefaultScreen(dpy));
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| 136 |
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| 137 | fs = XQueryFont(dpy, font);
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| 138 | if (!fs) {
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| 139 | crWarning("Couldn't get font structure information");
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| 140 | return;
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| 141 | }
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| 142 |
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| 143 | /* Allocate a bitmap that can fit all characters. */
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| 144 | max_width = fs->max_bounds.rbearing - fs->min_bounds.lbearing;
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| 145 | max_height = fs->max_bounds.ascent + fs->max_bounds.descent;
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| 146 | max_bm_width = (max_width + 7) / 8;
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| 147 | max_bm_height = max_height;
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| 148 |
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| 149 | bm = (GLubyte *) crAlloc((max_bm_width * max_bm_height) * sizeof(GLubyte));
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| 150 | if (!bm) {
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| 151 | XFreeFontInfo( NULL, fs, 1 );
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| 152 | crWarning("Couldn't allocate bitmap in glXUseXFont()");
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| 153 | return;
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| 154 | }
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| 155 |
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| 156 | /* Save the current packing mode for bitmaps. */
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| 157 | glGetIntegerv(GL_UNPACK_SWAP_BYTES, &swapbytes);
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| 158 | glGetIntegerv(GL_UNPACK_LSB_FIRST, &lsbfirst);
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| 159 | glGetIntegerv(GL_UNPACK_ROW_LENGTH, &rowlength);
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| 160 | glGetIntegerv(GL_UNPACK_SKIP_ROWS, &skiprows);
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| 161 | glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &skippixels);
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| 162 | glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment);
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| 163 |
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| 164 | /* Enforce a standard packing mode which is compatible with
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| 165 | fill_bitmap() from above. This is actually the default mode,
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| 166 | except for the (non)alignment. */
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| 167 | glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
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| 168 | glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
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| 169 | glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
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| 170 | glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
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| 171 | glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
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| 172 | glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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| 173 |
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| 174 | pixmap = XCreatePixmap(dpy, win, 10, 10, 1);
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| 175 | values.foreground = BlackPixel(dpy, DefaultScreen (dpy));
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| 176 | values.background = WhitePixel(dpy, DefaultScreen (dpy));
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| 177 | values.font = fs->fid;
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| 178 | valuemask = GCForeground | GCBackground | GCFont;
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| 179 | gc = XCreateGC(dpy, pixmap, valuemask, &values);
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| 180 | XFreePixmap(dpy, pixmap);
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| 181 |
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| 182 | for (i = 0; i < count; i++) {
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| 183 | unsigned int width, height, bm_width, bm_height;
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| 184 | GLfloat x0, y0, dx, dy;
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| 185 | XCharStruct *ch;
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| 186 | int x, y;
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| 187 | unsigned int c = first + i;
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| 188 | int list = listbase + i;
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| 189 | int valid;
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| 190 |
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| 191 | /* check on index validity and get the bounds */
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| 192 | ch = isvalid(fs, c);
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| 193 | if (!ch) {
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| 194 | ch = &fs->max_bounds;
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| 195 | valid = 0;
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| 196 | }
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| 197 | else {
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| 198 | valid = 1;
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| 199 | }
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| 200 |
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| 201 | /* glBitmap()' parameters:
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| 202 | straight from the glXUseXFont(3) manpage. */
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| 203 | width = ch->rbearing - ch->lbearing;
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| 204 | height = ch->ascent + ch->descent;
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| 205 | x0 = -ch->lbearing;
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| 206 | y0 = ch->descent - 0; /* XXX used to subtract 1 here */
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[33540] | 207 | /* but that caused a conformance failure */
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[18882] | 208 | dx = ch->width;
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| 209 | dy = 0;
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| 210 |
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| 211 | /* X11's starting point. */
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| 212 | x = -ch->lbearing;
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| 213 | y = ch->ascent;
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| 214 |
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| 215 | /* Round the width to a multiple of eight. We will use this also
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| 216 | for the pixmap for capturing the X11 font. This is slightly
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| 217 | inefficient, but it makes the OpenGL part real easy. */
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| 218 | bm_width = (width + 7) / 8;
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| 219 | bm_height = height;
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| 220 |
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| 221 | glNewList(list, GL_COMPILE);
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| 222 | if (valid && (bm_width > 0) && (bm_height > 0)) {
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| 223 | crMemset(bm, '\0', bm_width * bm_height);
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| 224 | fill_bitmap(dpy, win, gc, bm_width, bm_height, x, y, c, bm);
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| 225 | glBitmap(width, height, x0, y0, dx, dy, bm);
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| 226 | }
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| 227 | else {
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| 228 | glBitmap(0, 0, 0.0, 0.0, dx, dy, NULL);
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| 229 | }
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| 230 | glEndList();
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| 231 | }
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| 232 |
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| 233 | crFree(bm);
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| 234 | XFreeFontInfo(NULL, fs, 1);
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| 235 | XFreeGC(dpy, gc);
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| 236 |
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| 237 | /* Restore saved packing modes. */
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| 238 | glPixelStorei(GL_UNPACK_SWAP_BYTES, swapbytes);
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| 239 | glPixelStorei(GL_UNPACK_LSB_FIRST, lsbfirst);
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| 240 | glPixelStorei(GL_UNPACK_ROW_LENGTH, rowlength);
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| 241 | glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows);
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| 242 | glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels);
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| 243 | glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
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| 244 | }
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