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