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106 lines
2.2 KiB
Plaintext
106 lines
2.2 KiB
Plaintext
--- scale.h.orig Sat Jan 15 14:23:58 2000
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+++ scale.h Sat Jan 15 00:00:00 2000
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@@ -0,0 +1,102 @@
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+/* scale image from SRC to DST - parameterized by type T */
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+
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+/* get pixel address of point (x,y) in image t */
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+#define getP(t,x,y) \
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+ (T *) (&ximage[t]->data[(ximage[t]->xoffset+(x))*sizeof(T) + \
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+ (y)*ximage[t]->bytes_per_line])
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+
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+{
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+ int i, j, k;
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+
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+ /* copy scaled lines from SRC to DST */
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+ j = flipxy ? width[SRC] - 1 : height[SRC] - 1;
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+ do {
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+ T *p1;
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+ T *p2;
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+ int p2step;
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+ T *p1_save;
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+
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+ /* p1 point to begining of scanline j*magy in DST */
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+ p1 = getP(DST,0,j*magy);
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+ p1_save = p1;
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+ /* p2 point to begining of scanline j in SRC */
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+ /* if flipy then line height[SRC]-1-j */
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+ p2 = getP(SRC,0,flipy ? (height[SRC]-1-j) : j);
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+
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+ if (flipxy)
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+ {
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+ p2 = getP(SRC,flipy ? j : (width[SRC]-1-j),0);
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+ p2step = ximage[SRC]->bytes_per_line / sizeof(T);
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+
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+ if (flipx)
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+ {
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+ p2 += p2step * (height[SRC]-1);
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+ p2step = -p2step;
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+ }
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+
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+ i = height[SRC];
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+ do {
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+ T c = *p2; p2 += p2step;
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+ k = magx; do *p1++ = c; while (--k > 0);
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+ } while (--i > 0);
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+ }
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+ else if (flipx)
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+ {
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+ p2 += width[SRC];
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+ i = width[SRC];
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+ do {
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+ T c = *--p2;
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+ k = magx; do *p1++ = c; while (--k > 0);
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+ } while (--i > 0);
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+ }
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+ else
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+ {
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+ i = width[SRC];
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+ do {
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+ T c = *p2++;
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+ k = magx; do *p1++ = c; while (--k > 0);
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+ } while (--i > 0);
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+ }
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+
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+ /* draw vertical grid */
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+ if (gridy && magx >= 2)
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+ {
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+ p1 = p1_save - 1;
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+ i = magx;
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+ k = flipxy ? height[SRC] : width[SRC];
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+ do {
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+ p1 += i;
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+ *p1 ^= ~((T)0);
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+ } while (--k > 0);
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+ }
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+
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+ /* duplicate that line as needed */
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+ if (magy > 1)
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+ {
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+ /* p1 point to begining of scanline j*magy in DST */
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+ p1 = p1_save;
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+ /* p2 points to begining of next line */
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+ p2 = p1;
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+ p2step = ximage[DST]->bytes_per_line / sizeof(T);
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+
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+ i = width[DST] * sizeof(T);
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+ k = magy - 1;
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+ do {
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+ p2 += p2step;
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+ memcpy(p2, p1, i);
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+ } while (--k > 0);
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+
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+ /* draw horizontal grid */
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+ if (gridx && magy >= 2)
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+ {
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+ k = width[DST];
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+ do {
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+ *p2++ ^= ~((T)0);
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+ } while (--k > 0);
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+ }
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+ }
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+ } while (--j >= 0);
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+}
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+
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+#undef getP
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+
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