Changeset 3415 for libpipi/trunk/pipi/resize.cTweet

Timestamp:

Apr 21, 2009, 1:56:41 AM (12 years ago)

Author:

Sam Hocevar

Message:

resize.c: add pipi_crop() and the --crop flag.

File:

• libpipi/trunk/pipi/resize.c (modified) (1 diff)

libpipi/trunk/pipi/resize.c

@@ -124 +124 @@
 }
 
+pipi_image_t *pipi_crop(pipi_image_t *src, int w, int h, int dx, int dy)
+{
+    float *srcdata, *dstdata;
+    pipi_image_t *dst;
+    pipi_pixels_t *srcp, *dstp;
+    int y, off, len;
+
+    srcp = pipi_get_pixels(src, PIPI_PIXELS_RGBA_F32);
+    srcdata = (float *)srcp->pixels;
+
+    dst = pipi_new(w, h);
+    dstp = pipi_get_pixels(dst, PIPI_PIXELS_RGBA_F32);
+    dstdata = (float *)dstp->pixels;
+
+    off = dx;
+    len = w;
+
+    if(dx < 0)
+    {
+        len += dx;
+        dx = 0;
+    }
+
+    if(dx + len > srcp->w)
+        len = srcp->w - dx;
+
+    if(len > 0)
+    {
+        for(y = 0; y < h; y++)
+        {
+            if(y + dy < 0 || y + dy >= srcp->h)
+                continue;
+
+            memcpy(dstdata + y * w * 4,
+                   srcdata + ((y + dy) * srcp->w + dx) * 4,
+                   len * 4 * sizeof(float));
+        }
+    }
+
+    return dst;
+}
+