80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
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#include "libgraph.h"
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#include "image.h"
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#include <memory.h>
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value gr_make_image(m)
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value m;
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{
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int width, height;
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value im;
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Bool has_transp;
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XImage * idata, * imask;
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char * bdata, * bmask;
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int i, j, rgb;
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value line;
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GC gc;
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gr_check_open();
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height = Wosize_val(m);
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if (height == 0) return gr_new_image(0, 0);
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width = Wosize_val(Field(m, 0));
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for (i = 1; i < height; i++)
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if (Wosize_val(Field(m, i)) != width)
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gr_fail("make_image: lines of different lengths", NULL);
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/* Build an XImage for the data part of the image */
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idata =
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XCreateImage(grdisplay, DefaultVisual(grdisplay, grscreen),
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XDefaultDepth(grdisplay, grscreen),
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ZPixmap, 0, NULL, width, height,
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BitmapPad(grdisplay), 0);
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bdata = (char *) stat_alloc(height * idata->bytes_per_line);
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idata->data = bdata;
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has_transp = False;
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for (i = 0; i < height; i++) {
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line = Field(m, i);
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for (j = 0; j < width; j++) {
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rgb = Int_val(Field(line, j));
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if (rgb == Transparent) { has_transp = True; rgb = 0; }
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XPutPixel(idata, j, i, gr_pixel_rgb(rgb));
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}
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}
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/* If the matrix contains transparent points,
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build an XImage for the mask part of the image */
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if (has_transp) {
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imask =
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XCreateImage(grdisplay, DefaultVisual(grdisplay, grscreen),
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1, ZPixmap, 0, NULL, width, height,
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BitmapPad(grdisplay), 0);
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bmask = (char *) stat_alloc(height * imask->bytes_per_line);
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imask->data = bmask;
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for (i = 0; i < height; i++) {
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line = Field(m, i);
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for (j = 0; j < width; j++) {
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rgb = Int_val(Field(line, j));
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XPutPixel(imask, j, i, rgb != Transparent);
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}
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}
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}
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/* Allocate the image and store the XImages into the Pixmaps */
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im = gr_new_image(width, height);
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gc = XCreateGC(grdisplay, Data_im(im), 0, NULL);
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XPutImage(grdisplay, Data_im(im), gc, idata, 0, 0, 0, 0, width, height);
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XDestroyImage(idata);
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XFreeGC(grdisplay, gc);
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if (has_transp) {
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Mask_im(im) = XCreatePixmap(grdisplay, grwindow.win, width, height, 1);
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gc = XCreateGC(grdisplay, Mask_im(im), 0, NULL);
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XPutImage(grdisplay, Mask_im(im), gc, imask, 0, 0, 0, 0, width, height);
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XDestroyImage(imask);
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XFreeGC(grdisplay, gc);
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}
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XFlush(grdisplay);
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return im;
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}
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