* Implement pipi_vflip() and pipi_hflip().

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2749 92316355-f0b4-4df1-b90c-862c8a59935f

pipi/Makefile.am

@@ -55,6 +55,7 @@ filter_sources = \
 	filter/blur.c \
 	filter/convolution.c filter/convolution_template.h \
 	filter/color.c \
+	filter/transform.c \
 	filter/median.c \
 	filter/dilate.c
 

pipi/context.c

@@ -324,6 +324,24 @@ int pipi_command(pipi_context_t *ctx, char const *cmd, ...)
         pipi_free(src);
         ctx->images[ctx->nimages - 1] = dst;
     }
+    else if(!strcmp(cmd, "hflip"))
+    {
+        pipi_image_t *tmp;
+        if(ctx->nimages < 1)
+            return -1;
+        tmp = ctx->images[ctx->nimages - 1];
+        ctx->images[ctx->nimages - 1] = pipi_hflip(tmp);
+        pipi_free(tmp);
+    }
+    else if(!strcmp(cmd, "vflip"))
+    {
+        pipi_image_t *tmp;
+        if(ctx->nimages < 1)
+            return -1;
+        tmp = ctx->images[ctx->nimages - 1];
+        ctx->images[ctx->nimages - 1] = pipi_vflip(tmp);
+        pipi_free(tmp);
+    }
     else if(!strcmp(cmd, "mean"))
     {
         pipi_image_t *dst;

pipi/filter/transform.c

@@ -0,0 +1,115 @@
+/*
+ *  libpipi       Proper image processing implementation library
+ *  Copyright (c) 2004-2008 Sam Hocevar <sam@zoy.org>
+ *                All Rights Reserved
+ *
+ *  $Id$
+ *
+ *  This library is free software. It comes without any warranty, to
+ *  the extent permitted by applicable law. You can redistribute it
+ *  and/or modify it under the terms of the Do What The Fuck You Want
+ *  To Public License, Version 2, as published by Sam Hocevar. See
+ *  http://sam.zoy.org/wtfpl/COPYING for more details.
+ */
+
+/*
+ * transform.c: basic transformation functions
+ */
+
+#include "config.h"
+#include "common.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+#include "pipi.h"
+#include "pipi_internals.h"
+
+pipi_image_t *pipi_hflip(pipi_image_t *src)
+{
+    pipi_image_t *dst;
+    pipi_pixels_t *srcp, *dstp;
+    float *srcdata, *dstdata;
+    int x, y, w, h, gray;
+
+    w = src->w;
+    h = src->h;
+
+    gray = (src->last_modified == PIPI_PIXELS_Y_F);
+
+    srcp = gray ? pipi_getpixels(src, PIPI_PIXELS_Y_F)
+                : pipi_getpixels(src, PIPI_PIXELS_RGBA_F);
+    srcdata = (float *)srcp->pixels;
+
+    dst = pipi_new(w, h);
+    dstp = gray ? pipi_getpixels(dst, PIPI_PIXELS_Y_F)
+                : pipi_getpixels(dst, PIPI_PIXELS_RGBA_F);
+    dstdata = (float *)dstp->pixels;
+
+    for(y = 0; y < h; y++)
+    {
+        for(x = 0; x < w; x++)
+        {
+            if(gray)
+            {
+                dstdata[y * w + x] = srcdata[y * w + w - 1 - x];
+            }
+            else
+            {
+                dstdata[4 * (y * w + x)]
+                                = srcdata[4 * (y * w + w - 1 - x)];
+                dstdata[4 * (y * w + x) + 1]
+                                = srcdata[4 * (y * w + w - 1 - x) + 1];
+                dstdata[4 * (y * w + x) + 2]
+                                = srcdata[4 * (y * w + w - 1 - x) + 2];
+                dstdata[4 * (y * w + x) + 3]
+                                = srcdata[4 * (y * w + w - 1 - x) + 3];
+            }
+        }
+    }
+
+    return dst;
+}
+
+pipi_image_t *pipi_vflip(pipi_image_t *src)
+{
+    pipi_image_t *dst;
+    pipi_pixels_t *srcp, *dstp;
+    float *srcdata, *dstdata;
+    int x, y, w, h, gray;
+
+    w = src->w;
+    h = src->h;
+
+    gray = (src->last_modified == PIPI_PIXELS_Y_F);
+
+    srcp = gray ? pipi_getpixels(src, PIPI_PIXELS_Y_F)
+                : pipi_getpixels(src, PIPI_PIXELS_RGBA_F);
+    srcdata = (float *)srcp->pixels;
+
+    dst = pipi_new(w, h);
+    dstp = gray ? pipi_getpixels(dst, PIPI_PIXELS_Y_F)
+                : pipi_getpixels(dst, PIPI_PIXELS_RGBA_F);
+    dstdata = (float *)dstp->pixels;
+
+    for(y = 0; y < h; y++)
+    {
+        if(gray)
+        {
+            memcpy(dstdata + y * w,
+                   srcdata + (h - 1 - y) * w,
+                   w * sizeof(*dstdata));
+        }
+        else
+        {
+            memcpy(dstdata + 4 * y * w,
+                   srcdata + 4 * (h - 1 - y) * w,
+                   4 * w * sizeof(*dstdata));
+        }
+    }
+
+    return dst;
+}
+

pipi/pipi.h

@@ -127,6 +127,8 @@ extern pipi_image_t *pipi_contrast(pipi_image_t *, double);
 extern pipi_image_t *pipi_autocontrast(pipi_image_t *);
 extern pipi_image_t *pipi_invert(pipi_image_t *);
 extern pipi_image_t *pipi_threshold(pipi_image_t *, double);
+extern pipi_image_t *pipi_hflip(pipi_image_t *);
+extern pipi_image_t *pipi_vflip(pipi_image_t *);
 extern pipi_image_t *pipi_median(pipi_image_t *, int);
 extern pipi_image_t *pipi_median_ext(pipi_image_t *, int, int);
 extern pipi_image_t *pipi_dilate(pipi_image_t *);

src/pipi.c

@@ -107,6 +107,16 @@ int main(int argc, char *argv[])
             if(pipi_command(ctx, "autocontrast") != 0)
                 return EXIT_FAILURE;
         }
+        else if(!strcmp(argv[0], "--hflip"))
+        {
+            if(pipi_command(ctx, "hflip") != 0)
+                return EXIT_FAILURE;
+        }
+        else if(!strcmp(argv[0], "--vflip"))
+        {
+            if(pipi_command(ctx, "vflip") != 0)
+                return EXIT_FAILURE;
+        }
         else if(!strcmp(argv[0], "--invert"))
         {
             if(pipi_command(ctx, "invert") != 0)