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/* -----------------------------------------------------------------------------
* pixmap.c
*
* Pixel maps (i.e., bitmaps)
*
* Author(s) : David Beazley (beazley@cs.uchicago.edu)
* Copyright (C) 1995-1996
*
* See the file LICENSE for information on usage and redistribution.
* ----------------------------------------------------------------------------- */
#define PIXMAP
#include "gifplot.h"
/* -----------------------------------------------------------------------
PixMap *new_PixMap(int width, int height, int centerx, int centery)
Create a new pixmap of given size
----------------------------------------------------------------------- */
PixMap *new_PixMap(int width, int height, int centerx, int centery) {
PixMap *pm;
if ((width > 0) && (height > 0)) {
pm = (PixMap *) malloc(sizeof(PixMap));
pm->width = width;
pm->height = height;
pm->centerx = centerx;
pm->centery = centery;
pm->map = (int *) malloc(height*width*sizeof(int));
return pm;
}
return (PixMap *) 0;
}
/* --------------------------------------------------------------------------
void delete_PixMap(PixMap *pm)
Destroy a pixmap
-------------------------------------------------------------------------- */
void delete_PixMap(PixMap *pm) {
if (pm) {
free((char *) pm->map);
free((char *) pm);
}
}
/* ---------------------------------------------------------------------------
void PixMap_set(PixMap *pm, int x, int y, int pix)
Set a pixel in the bitmap
--------------------------------------------------------------------------- */
void
PixMap_set(PixMap *pm, int x, int y, int pix) {
if ((x < 0) || (x>=pm->width)) return;
if ((y < 0) || (y>=pm->height)) return;
pm->map[pm->width*y + x] = pix;
}
/* -----------------------------------------------------------------------------
void FrameBuffer_drawpixmap(FrameBuffer *f, PixMap *pm, int x, int y, int fgcolor, int bgcolor)
Draw a pixmap onto the framebuffer. This is somewhat optimized for speed.
------------------------------------------------------------------------------ */
void
FrameBuffer_drawpixmap(FrameBuffer *f, PixMap *pm, int x, int y, int fgcolor, int bgcolor) {
int startx, starty; /* Starting location on framebuffer */
int startpixx = 0, startpixy = 0; /* Starting location in pixmap */
int endx, endy; /* Ending location on framebuffer */
int i,j, px, py;
int c;
startx = x - pm->centerx;
starty = y + pm->centery;
endx = startx + pm->width;
endy = starty - pm->height;
/* Figure out if we need to clip */
if (startx < f->xmin) {
startpixx = f->xmin - startx;
startx = f->xmin;
}
if (starty >= f->ymax) {
startpixy = starty - f->ymax;
starty = f->ymax-1;
}
if (endx >= f->xmax) {
endx = f->xmax-1;
}
if (endy < f->ymin) {
endy = f->ymin;
}
py = startpixy;
for (j = starty; j >= endy; j--) {
px = startpixx;
for (i = startx; i < endx; i++) {
c = pm->map[py*pm->width + px];
switch (c) {
case GIFPLOT_FOREGROUND:
f->pixels[j][i] = fgcolor;
break;
case GIFPLOT_BACKGROUND:
f->pixels[j][i] = bgcolor;
break;
default:
break;
}
px++;
}
py++;
}
}
/**************************************************************************
* Some common PixMaps (for plotting)
*
**************************************************************************/
int _SQUARE_MAP[] = {
0,1,1,1,1,1,1,1,
0,1,1,1,1,1,1,1,
0,1,1,1,1,1,1,1,
0,1,1,1,1,1,1,1,
0,1,1,1,1,1,1,1,
0,1,1,1,1,1,1,1,
0,1,1,1,1,1,1,1,
0,0,0,0,0,0,0,0 };
PixMap PixMap_SQUARE = { 8,8,4,4, _SQUARE_MAP};
int _TRIANGLE_MAP[] = {
0,0,0,1,0,0,0,0,
0,0,0,1,0,0,0,0,
0,0,1,1,1,0,0,0,
0,0,1,1,1,0,0,0,
0,1,1,1,1,1,0,0,
0,1,1,1,1,1,0,0,
1,1,1,1,1,1,1,0,
0,0,0,0,0,0,0,0 };
PixMap PixMap_TRIANGLE = { 8,8,4,4,_TRIANGLE_MAP};
int _CROSS_MAP[] = {
0,0,0,1,0,0,0,0,
0,0,0,1,0,0,0,0,
0,0,0,1,0,0,0,0,
1,1,1,1,1,1,1,0,
0,0,0,1,0,0,0,0,
0,0,0,1,0,0,0,0,
0,0,0,1,0,0,0,0,
0,0,0,0,0,0,0,0 };
PixMap PixMap_CROSS = { 8,8,4,4,_CROSS_MAP};
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