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-rw-r--r--progs/xdemos/xuserotfont.c399
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diff --git a/progs/xdemos/xuserotfont.c b/progs/xdemos/xuserotfont.c
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--- a/progs/xdemos/xuserotfont.c
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-/*
- * Mesa 3-D graphics library
- * Version: 6.1
- *
- * Copyright (C) 1999-2004 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
- * BRIAN PAUL 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.
- */
-
-
-/* \file xuserotfont.c
- *
- * A function like glXUseXFont() but takes a 0, 90, 180 or 270 degree
- * rotation angle for rotated text display.
- *
- * Based on Mesa's glXUseXFont implementation written by Thorsten Ohl.
- */
-
-#include <assert.h>
-#include <stdlib.h>
-#include <string.h>
-#include <GL/glx.h>
-#include "xuserotfont.h"
-
-
-/**
- * Generate OpenGL-compatible bitmap by drawing an X character glyph
- * to an off-screen pixmap, then getting the image and testing pixels.
- * \param width bitmap width in pixels
- * \param height bitmap height in pixels
- */
-static void
-fill_bitmap(Display *dpy, Pixmap pixmap, GC gc,
- unsigned int bitmapWidth, unsigned int bitmapHeight,
- unsigned int charWidth, unsigned int charHeight,
- int xPos, int yPos, unsigned int c, GLubyte * bitmap,
- int rotation)
-{
- const int bytesPerRow = (bitmapWidth + 7) / 8;
- XImage *image;
- XChar2b char2b;
-
- /* clear pixmap to 0 */
- XSetForeground(dpy, gc, 0);
- XFillRectangle(dpy, pixmap, gc, 0, 0, charWidth, charHeight);
-
- /* The glyph is drawn snug up against the left/top edges of the pixmap */
- XSetForeground(dpy, gc, 1);
- char2b.byte1 = (c >> 8) & 0xff;
- char2b.byte2 = (c & 0xff);
- XDrawString16(dpy, pixmap, gc, xPos, yPos, &char2b, 1);
-
- /* initialize GL bitmap */
- memset(bitmap, 0, bytesPerRow * bitmapHeight);
-
- image = XGetImage(dpy, pixmap, 0, 0, charWidth, charHeight, 1, XYPixmap);
- if (image) {
- /* Set appropriate bits in the GL bitmap.
- * Note: X11 and OpenGL are upside down wrt each other).
- */
- unsigned int x, y;
- if (rotation == 0) {
- for (y = 0; y < charHeight; y++) {
- for (x = 0; x < charWidth; x++) {
- if (XGetPixel(image, x, y)) {
- int y2 = bitmapHeight - y - 1;
- bitmap[bytesPerRow * y2 + x / 8] |= (1 << (7 - (x % 8)));
- }
- }
- }
- }
- else if (rotation == 90) {
- for (y = 0; y < charHeight; y++) {
- for (x = 0; x < charWidth; x++) {
- if (XGetPixel(image, x, y)) {
- int x2 = y;
- int y2 = x;
- bitmap[bytesPerRow * y2 + x2 / 8] |= (1 << (7 - (x2 % 8)));
- }
- }
- }
- }
- else if (rotation == 180) {
- for (y = 0; y < charHeight; y++) {
- for (x = 0; x < charWidth; x++) {
- if (XGetPixel(image, x, y)) {
- int x2 = charWidth - x - 1;
- bitmap[bytesPerRow * y + x2 / 8] |= (1 << (7 - (x2 % 8)));
- }
- }
- }
- }
- else {
- assert(rotation == 270);
- for (y = 0; y < charHeight; y++) {
- for (x = 0; x < charWidth; x++) {
- if (XGetPixel(image, x, y)) {
- int x2 = charHeight - y - 1;
- int y2 = charWidth - x - 1;
- bitmap[bytesPerRow * y2 + x2 / 8] |= (1 << (7 - (x2 % 8)));
- }
- }
- }
- }
- XDestroyImage(image);
- }
-}
-
-
-/*
- * Determine if a given glyph is valid and return the
- * corresponding XCharStruct.
- */
-static const XCharStruct *
-isvalid(const 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;
-
- 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;
- }
-
- 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;
-}
-
-
-void
-glXUseRotatedXFontMESA(Font font, int first, int count, int listbase,
- int rotation)
-{
- Display *dpy;
- Window win;
- Pixmap pixmap;
- GC gc;
- XFontStruct *fs;
- GLint swapbytes, lsbfirst, rowlength;
- GLint skiprows, skippixels, alignment;
- unsigned int maxCharWidth, maxCharHeight;
- GLubyte *bm;
- int i;
-
- if (rotation != 0 &&
- rotation != 90 &&
- rotation != 180 &&
- rotation != 270)
- return;
-
- dpy = glXGetCurrentDisplay();
- if (!dpy)
- return; /* I guess glXMakeCurrent wasn't called */
- win = RootWindow(dpy, DefaultScreen(dpy));
-
- fs = XQueryFont(dpy, font);
- if (!fs) {
- /*
- _mesa_error(NULL, GL_INVALID_VALUE,
- "Couldn't get font structure information");
- */
- return;
- }
-
- /* Allocate a GL bitmap that can fit any character */
- maxCharWidth = fs->max_bounds.rbearing - fs->min_bounds.lbearing;
- maxCharHeight = fs->max_bounds.ascent + fs->max_bounds.descent;
- /* use max, in case we're rotating */
- if (rotation == 90 || rotation == 270) {
- /* swap width/height */
- bm = (GLubyte *) malloc((maxCharHeight + 7) / 8 * maxCharWidth);
- }
- else {
- /* normal or upside down */
- bm = (GLubyte *) malloc((maxCharWidth + 7) / 8 * maxCharHeight);
- }
- if (!bm) {
- XFreeFontInfo(NULL, fs, 1);
- /*
- _mesa_error(NULL, GL_OUT_OF_MEMORY,
- "Couldn't allocate bitmap in glXUseXFont()");
- */
- return;
- }
-
-#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
-
- /* 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);
-
- /* 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);
-
- /* Create pixmap and GC */
- pixmap = XCreatePixmap(dpy, win, maxCharWidth, maxCharHeight, 1);
- {
- XGCValues values;
- unsigned long valuemask;
- 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);
- }
-
-#ifdef DEBUG_XROT
- if (debug_xfonts)
- dump_font_struct(fs);
-#endif
-
- for (i = 0; i < count; i++) {
- const unsigned int c = first + i;
- const int list = listbase + i;
- unsigned int charWidth, charHeight;
- unsigned int bitmapWidth = 0, bitmapHeight = 0;
- GLfloat xOrig, yOrig, xStep, yStep, dtemp;
- const XCharStruct *ch;
- int xPos, yPos;
- 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;
- }
-
-#ifdef DEBUG_XROT
- 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. */
- charWidth = ch->rbearing - ch->lbearing;
- charHeight = ch->ascent + ch->descent;
- xOrig = -ch->lbearing;
- yOrig = ch->descent;
- xStep = ch->width;
- yStep = 0;
-
- /* X11's starting point. */
- xPos = -ch->lbearing;
- yPos = ch->ascent;
-
- /* Apply rotation */
- switch (rotation) {
- case 0:
- /* nothing */
- bitmapWidth = charWidth;
- bitmapHeight = charHeight;
- break;
- case 90:
- /* xStep, yStep */
- dtemp = xStep;
- xStep = -yStep;
- yStep = dtemp;
- /* xOrig, yOrig */
- yOrig = xOrig;
- xOrig = charHeight - (charHeight - yPos);
- /* width, height */
- bitmapWidth = charHeight;
- bitmapHeight = charWidth;
- break;
- case 180:
- /* xStep, yStep */
- xStep = -xStep;
- yStep = -yStep;
- /* xOrig, yOrig */
- xOrig = charWidth - xOrig - 1;
- yOrig = charHeight - yOrig - 1;
- bitmapWidth = charWidth;
- bitmapHeight = charHeight;
- break;
- case 270:
- /* xStep, yStep */
- dtemp = xStep;
- xStep = yStep;
- yStep = -dtemp;
- /* xOrig, yOrig */
- dtemp = yOrig;
- yOrig = charWidth - xOrig;
- xOrig = dtemp;
- /* width, height */
- bitmapWidth = charHeight;
- bitmapHeight = charWidth;
- break;
- default:
- /* should never get here */
- ;
- }
-
- glNewList(list, GL_COMPILE);
- if (valid && bitmapWidth > 0 && bitmapHeight > 0) {
-
- fill_bitmap(dpy, pixmap, gc, bitmapWidth, bitmapHeight,
- charWidth, charHeight,
- xPos, yPos, c, bm, rotation);
-
- glBitmap(bitmapWidth, bitmapHeight, xOrig, yOrig, xStep, yStep, bm);
-
-#ifdef DEBUG_XROT
- if (debug_xfonts) {
- printf("width/height = %u/%u\n", bitmapWidth, bitmapHeight);
- dump_bitmap(bitmapWidth, bitmapHeight, bm);
- }
-#endif
- }
- else {
- glBitmap(0, 0, 0.0, 0.0, xStep, yStep, NULL);
- }
- glEndList();
- }
-
- free(bm);
- XFreeFontInfo(NULL, fs, 1);
- XFreePixmap(dpy, pixmap);
- XFreeGC(dpy, gc);
-
- /* 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);
-}
-
-
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