400 lines
12 KiB
C
400 lines
12 KiB
C
/*
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* Mesa 3-D graphics library
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* Version: 6.1
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*
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* Copyright (C) 1999-2004 Brian Paul All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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* AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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/* \file xuserotfont.c
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*
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* A function like glXUseXFont() but takes a 0, 90, 180 or 270 degree
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* rotation angle for rotated text display.
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*
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* Based on Mesa's glXUseXFont implementation written by Thorsten Ohl.
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*/
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#include <assert.h>
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#include <stdlib.h>
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#include <string.h>
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#include <GL/glx.h>
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#include "xuserotfont.h"
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/**
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* Generate OpenGL-compatible bitmap by drawing an X character glyph
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* to an off-screen pixmap, then getting the image and testing pixels.
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* \param width bitmap width in pixels
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* \param height bitmap height in pixels
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*/
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static void
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fill_bitmap(Display *dpy, Pixmap pixmap, GC gc,
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unsigned int bitmapWidth, unsigned int bitmapHeight,
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unsigned int charWidth, unsigned int charHeight,
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int xPos, int yPos, unsigned int c, GLubyte * bitmap,
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int rotation)
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{
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const int bytesPerRow = (bitmapWidth + 7) / 8;
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XImage *image;
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XChar2b char2b;
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/* clear pixmap to 0 */
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XSetForeground(dpy, gc, 0);
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XFillRectangle(dpy, pixmap, gc, 0, 0, charWidth, charHeight);
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/* The glyph is drawn snug up against the left/top edges of the pixmap */
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XSetForeground(dpy, gc, 1);
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char2b.byte1 = (c >> 8) & 0xff;
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char2b.byte2 = (c & 0xff);
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XDrawString16(dpy, pixmap, gc, xPos, yPos, &char2b, 1);
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/* initialize GL bitmap */
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memset(bitmap, 0, bytesPerRow * bitmapHeight);
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image = XGetImage(dpy, pixmap, 0, 0, charWidth, charHeight, 1, XYPixmap);
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if (image) {
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/* Set appropriate bits in the GL bitmap.
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* Note: X11 and OpenGL are upside down wrt each other).
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*/
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unsigned int x, y;
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if (rotation == 0) {
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for (y = 0; y < charHeight; y++) {
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for (x = 0; x < charWidth; x++) {
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if (XGetPixel(image, x, y)) {
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int y2 = bitmapHeight - y - 1;
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bitmap[bytesPerRow * y2 + x / 8] |= (1 << (7 - (x % 8)));
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}
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}
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}
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}
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else if (rotation == 90) {
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for (y = 0; y < charHeight; y++) {
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for (x = 0; x < charWidth; x++) {
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if (XGetPixel(image, x, y)) {
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int x2 = y;
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int y2 = x;
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bitmap[bytesPerRow * y2 + x2 / 8] |= (1 << (7 - (x2 % 8)));
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}
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}
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}
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}
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else if (rotation == 180) {
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for (y = 0; y < charHeight; y++) {
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for (x = 0; x < charWidth; x++) {
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if (XGetPixel(image, x, y)) {
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int x2 = charWidth - x - 1;
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bitmap[bytesPerRow * y + x2 / 8] |= (1 << (7 - (x2 % 8)));
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}
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}
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}
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}
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else {
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assert(rotation == 270);
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for (y = 0; y < charHeight; y++) {
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for (x = 0; x < charWidth; x++) {
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if (XGetPixel(image, x, y)) {
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int x2 = charHeight - y - 1;
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int y2 = charWidth - x - 1;
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bitmap[bytesPerRow * y2 + x2 / 8] |= (1 << (7 - (x2 % 8)));
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}
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}
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}
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}
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XDestroyImage(image);
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}
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}
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/*
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* Determine if a given glyph is valid and return the
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* corresponding XCharStruct.
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*/
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static const XCharStruct *
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isvalid(const XFontStruct * fs, unsigned int which)
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{
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unsigned int rows, pages;
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unsigned int byte1 = 0, byte2 = 0;
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int i, valid = 1;
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rows = fs->max_byte1 - fs->min_byte1 + 1;
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pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1;
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if (rows == 1) {
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/* "linear" fonts */
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if ((fs->min_char_or_byte2 > which) || (fs->max_char_or_byte2 < which))
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valid = 0;
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}
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else {
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/* "matrix" fonts */
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byte2 = which & 0xff;
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byte1 = which >> 8;
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if ((fs->min_char_or_byte2 > byte2) ||
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(fs->max_char_or_byte2 < byte2) ||
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(fs->min_byte1 > byte1) || (fs->max_byte1 < byte1))
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valid = 0;
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}
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if (valid) {
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if (fs->per_char) {
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if (rows == 1) {
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/* "linear" fonts */
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return fs->per_char + (which - fs->min_char_or_byte2);
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}
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else {
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/* "matrix" fonts */
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i = ((byte1 - fs->min_byte1) * pages) +
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(byte2 - fs->min_char_or_byte2);
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return fs->per_char + i;
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}
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}
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else {
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return &fs->min_bounds;
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}
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}
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return NULL;
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}
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void
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glXUseRotatedXFontMESA(Font font, int first, int count, int listbase,
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int rotation)
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{
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Display *dpy;
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Window win;
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Pixmap pixmap;
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GC gc;
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XFontStruct *fs;
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GLint swapbytes, lsbfirst, rowlength;
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GLint skiprows, skippixels, alignment;
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unsigned int maxCharWidth, maxCharHeight;
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GLubyte *bm;
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int i;
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if (rotation != 0 &&
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rotation != 90 &&
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rotation != 180 &&
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rotation != 270)
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return;
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dpy = glXGetCurrentDisplay();
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if (!dpy)
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return; /* I guess glXMakeCurrent wasn't called */
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win = RootWindow(dpy, DefaultScreen(dpy));
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fs = XQueryFont(dpy, font);
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if (!fs) {
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/*
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_mesa_error(NULL, GL_INVALID_VALUE,
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"Couldn't get font structure information");
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*/
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return;
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}
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/* Allocate a GL bitmap that can fit any character */
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maxCharWidth = fs->max_bounds.rbearing - fs->min_bounds.lbearing;
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maxCharHeight = fs->max_bounds.ascent + fs->max_bounds.descent;
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/* use max, in case we're rotating */
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if (rotation == 90 || rotation == 270) {
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/* swap width/height */
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bm = (GLubyte *) malloc((maxCharHeight + 7) / 8 * maxCharWidth);
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}
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else {
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/* normal or upside down */
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bm = (GLubyte *) malloc((maxCharWidth + 7) / 8 * maxCharHeight);
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}
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if (!bm) {
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XFreeFontInfo(NULL, fs, 1);
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/*
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_mesa_error(NULL, GL_OUT_OF_MEMORY,
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"Couldn't allocate bitmap in glXUseXFont()");
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*/
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return;
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}
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#if 0
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/* get the page info */
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pages = fs->max_char_or_byte2 - fs->min_char_or_byte2 + 1;
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firstchar = (fs->min_byte1 << 8) + fs->min_char_or_byte2;
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lastchar = (fs->max_byte1 << 8) + fs->max_char_or_byte2;
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rows = fs->max_byte1 - fs->min_byte1 + 1;
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unsigned int first_char, last_char, pages, rows;
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#endif
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/* Save the current packing mode for bitmaps. */
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glGetIntegerv(GL_UNPACK_SWAP_BYTES, &swapbytes);
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glGetIntegerv(GL_UNPACK_LSB_FIRST, &lsbfirst);
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glGetIntegerv(GL_UNPACK_ROW_LENGTH, &rowlength);
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glGetIntegerv(GL_UNPACK_SKIP_ROWS, &skiprows);
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glGetIntegerv(GL_UNPACK_SKIP_PIXELS, &skippixels);
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glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment);
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/* Enforce a standard packing mode which is compatible with
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fill_bitmap() from above. This is actually the default mode,
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except for the (non)alignment. */
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glPixelStorei(GL_UNPACK_SWAP_BYTES, GL_FALSE);
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glPixelStorei(GL_UNPACK_LSB_FIRST, GL_FALSE);
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glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
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glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
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glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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/* Create pixmap and GC */
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pixmap = XCreatePixmap(dpy, win, maxCharWidth, maxCharHeight, 1);
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{
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XGCValues values;
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unsigned long valuemask;
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values.foreground = BlackPixel(dpy, DefaultScreen(dpy));
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values.background = WhitePixel(dpy, DefaultScreen(dpy));
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values.font = fs->fid;
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valuemask = GCForeground | GCBackground | GCFont;
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gc = XCreateGC(dpy, pixmap, valuemask, &values);
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}
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#ifdef DEBUG_XROT
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if (debug_xfonts)
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dump_font_struct(fs);
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#endif
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for (i = 0; i < count; i++) {
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const unsigned int c = first + i;
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const int list = listbase + i;
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unsigned int charWidth, charHeight;
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unsigned int bitmapWidth = 0, bitmapHeight = 0;
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GLfloat xOrig, yOrig, xStep, yStep, dtemp;
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const XCharStruct *ch;
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int xPos, yPos;
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int valid;
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/* check on index validity and get the bounds */
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ch = isvalid(fs, c);
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if (!ch) {
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ch = &fs->max_bounds;
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valid = 0;
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}
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else {
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valid = 1;
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}
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#ifdef DEBUG_XROT
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if (debug_xfonts) {
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char s[7];
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sprintf(s, isprint(c) ? "%c> " : "\\%03o> ", c);
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dump_char_struct(ch, s);
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}
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#endif
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/* glBitmap()' parameters:
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straight from the glXUseXFont(3) manpage. */
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charWidth = ch->rbearing - ch->lbearing;
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charHeight = ch->ascent + ch->descent;
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xOrig = -ch->lbearing;
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yOrig = ch->descent;
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xStep = ch->width;
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yStep = 0;
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/* X11's starting point. */
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xPos = -ch->lbearing;
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yPos = ch->ascent;
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/* Apply rotation */
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switch (rotation) {
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case 0:
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/* nothing */
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bitmapWidth = charWidth;
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bitmapHeight = charHeight;
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break;
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case 90:
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/* xStep, yStep */
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dtemp = xStep;
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xStep = -yStep;
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yStep = dtemp;
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/* xOrig, yOrig */
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yOrig = xOrig;
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xOrig = charHeight - (charHeight - yPos);
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/* width, height */
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bitmapWidth = charHeight;
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bitmapHeight = charWidth;
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break;
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case 180:
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/* xStep, yStep */
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xStep = -xStep;
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yStep = -yStep;
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/* xOrig, yOrig */
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xOrig = charWidth - xOrig - 1;
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yOrig = charHeight - yOrig - 1;
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bitmapWidth = charWidth;
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bitmapHeight = charHeight;
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break;
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case 270:
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/* xStep, yStep */
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dtemp = xStep;
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xStep = yStep;
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yStep = -dtemp;
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/* xOrig, yOrig */
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dtemp = yOrig;
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yOrig = charWidth - xOrig;
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xOrig = dtemp;
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/* width, height */
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bitmapWidth = charHeight;
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bitmapHeight = charWidth;
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break;
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default:
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/* should never get here */
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;
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}
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glNewList(list, GL_COMPILE);
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if (valid && bitmapWidth > 0 && bitmapHeight > 0) {
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fill_bitmap(dpy, pixmap, gc, bitmapWidth, bitmapHeight,
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charWidth, charHeight,
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xPos, yPos, c, bm, rotation);
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glBitmap(bitmapWidth, bitmapHeight, xOrig, yOrig, xStep, yStep, bm);
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#ifdef DEBUG_XROT
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if (debug_xfonts) {
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printf("width/height = %u/%u\n", bitmapWidth, bitmapHeight);
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dump_bitmap(bitmapWidth, bitmapHeight, bm);
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}
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#endif
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}
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else {
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glBitmap(0, 0, 0.0, 0.0, xStep, yStep, NULL);
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}
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glEndList();
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}
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free(bm);
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XFreeFontInfo(NULL, fs, 1);
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XFreePixmap(dpy, pixmap);
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XFreeGC(dpy, gc);
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/* Restore saved packing modes. */
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glPixelStorei(GL_UNPACK_SWAP_BYTES, swapbytes);
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glPixelStorei(GL_UNPACK_LSB_FIRST, lsbfirst);
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glPixelStorei(GL_UNPACK_ROW_LENGTH, rowlength);
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glPixelStorei(GL_UNPACK_SKIP_ROWS, skiprows);
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glPixelStorei(GL_UNPACK_SKIP_PIXELS, skippixels);
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glPixelStorei(GL_UNPACK_ALIGNMENT, alignment);
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}
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