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Diffstat (limited to 'Examples/GIFPlot/Lib/pixmap.c')
| -rw-r--r-- | Examples/GIFPlot/Lib/pixmap.c | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/Examples/GIFPlot/Lib/pixmap.c b/Examples/GIFPlot/Lib/pixmap.c new file mode 100644 index 0000000..a55cf04 --- /dev/null +++ b/Examples/GIFPlot/Lib/pixmap.c @@ -0,0 +1,159 @@ +/* ----------------------------------------------------------------------------- + * 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}; + + + |