From 36fb60cacfcdcf81b778c7426207ede2f5b4f808 Mon Sep 17 00:00:00 2001
From: sam <sam@92316355-f0b4-4df1-b90c-862c8a59935f>
Date: Thu, 21 Aug 2008 00:10:22 +0000
Subject: [PATCH]   * transform.c: implement pipi_rotate90, pipi_rotate180 and
 pipi_rotate270.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2750 92316355-f0b4-4df1-b90c-862c8a59935f
---
 pipi/context.c          |  27 ++++++++
 pipi/filter/transform.c | 140 +++++++++++++++++++++++++++++++++++++++-
 pipi/pipi.h             |   3 +
 src/pipi.c              |  15 +++++
 4 files changed, 184 insertions(+), 1 deletion(-)

diff --git a/pipi/context.c b/pipi/context.c
index 6e5d2ed..541f963 100644
--- a/pipi/context.c
+++ b/pipi/context.c
@@ -342,6 +342,33 @@ int pipi_command(pipi_context_t *ctx, char const *cmd, ...)
         ctx->images[ctx->nimages - 1] = pipi_vflip(tmp);
         pipi_free(tmp);
     }
+    else if(!strcmp(cmd, "rotate90"))
+    {
+        pipi_image_t *tmp;
+        if(ctx->nimages < 1)
+            return -1;
+        tmp = ctx->images[ctx->nimages - 1];
+        ctx->images[ctx->nimages - 1] = pipi_rotate90(tmp);
+        pipi_free(tmp);
+    }
+    else if(!strcmp(cmd, "rotate180"))
+    {
+        pipi_image_t *tmp;
+        if(ctx->nimages < 1)
+            return -1;
+        tmp = ctx->images[ctx->nimages - 1];
+        ctx->images[ctx->nimages - 1] = pipi_rotate180(tmp);
+        pipi_free(tmp);
+    }
+    else if(!strcmp(cmd, "rotate270"))
+    {
+        pipi_image_t *tmp;
+        if(ctx->nimages < 1)
+            return -1;
+        tmp = ctx->images[ctx->nimages - 1];
+        ctx->images[ctx->nimages - 1] = pipi_rotate270(tmp);
+        pipi_free(tmp);
+    }
     else if(!strcmp(cmd, "mean"))
     {
         pipi_image_t *dst;
diff --git a/pipi/filter/transform.c b/pipi/filter/transform.c
index 2052723..a7d0d70 100644
--- a/pipi/filter/transform.c
+++ b/pipi/filter/transform.c
@@ -78,7 +78,7 @@ 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;
+    int y, w, h, gray;
 
     w = src->w;
     h = src->h;
@@ -113,3 +113,141 @@ pipi_image_t *pipi_vflip(pipi_image_t *src)
     return dst;
 }
 
+pipi_image_t *pipi_rotate90(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(h, w);
+    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[x * h + y] = srcdata[y * w + w - 1 - x];
+            }
+            else
+            {
+                dstdata[4 * (x * h + y)]
+                    = srcdata[4 * (y * w + w - 1 - x)];
+                dstdata[4 * (x * h + y) + 1]
+                    = srcdata[4 * (y * w + w - 1 - x) + 1];
+                dstdata[4 * (x * h + y) + 2]
+                    = srcdata[4 * (y * w + w - 1 - x) + 2];
+                dstdata[4 * (x * h + y) + 3]
+                    = srcdata[4 * (y * w + w - 1 - x) + 3];
+            }
+        }
+    }
+
+    return dst;
+}
+
+pipi_image_t *pipi_rotate180(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[(h - 1 - y) * w + (w - 1 - x)];
+            }
+            else
+            {
+                dstdata[4 * (y * w + x)]
+                     = srcdata[4 * ((h - 1 - y) * w + (w - 1 - x))];
+                dstdata[4 * (y * w + x) + 1]
+                     = srcdata[4 * ((h - 1 - y) * w + (w - 1 - x)) + 1];
+                dstdata[4 * (y * w + x) + 2]
+                     = srcdata[4 * ((h - 1 - y) * w + (w - 1 - x)) + 2];
+                dstdata[4 * (y * w + x) + 3]
+                     = srcdata[4 * ((h - 1 - y) * w + (w - 1 - x)) + 3];
+            }
+        }
+    }
+
+    return dst;
+}
+
+pipi_image_t *pipi_rotate270(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(h, w);
+    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[x * h + h - 1 - y] = srcdata[y * w + x];
+            }
+            else
+            {
+                dstdata[4 * (x * h + h - 1 - y)]
+                    = srcdata[4 * (y * w + x)];
+                dstdata[4 * (x * h + h - 1 - y) + 1]
+                    = srcdata[4 * (y * w + x) + 1];
+                dstdata[4 * (x * h + h - 1 - y) + 2]
+                    = srcdata[4 * (y * w + x) + 2];
+                dstdata[4 * (x * h + h - 1 - y) + 3]
+                    = srcdata[4 * (y * w + x) + 3];
+            }
+        }
+    }
+
+    return dst;
+}
+
diff --git a/pipi/pipi.h b/pipi/pipi.h
index bf8ba80..779a65b 100644
--- a/pipi/pipi.h
+++ b/pipi/pipi.h
@@ -129,6 +129,9 @@ 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_rotate90(pipi_image_t *);
+extern pipi_image_t *pipi_rotate180(pipi_image_t *);
+extern pipi_image_t *pipi_rotate270(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 *);
diff --git a/src/pipi.c b/src/pipi.c
index 9ca60c8..7387511 100644
--- a/src/pipi.c
+++ b/src/pipi.c
@@ -117,6 +117,21 @@ int main(int argc, char *argv[])
             if(pipi_command(ctx, "vflip") != 0)
                 return EXIT_FAILURE;
         }
+        else if(!strcmp(argv[0], "--rotate90"))
+        {
+            if(pipi_command(ctx, "rotate90") != 0)
+                return EXIT_FAILURE;
+        }
+        else if(!strcmp(argv[0], "--rotate180"))
+        {
+            if(pipi_command(ctx, "rotate180") != 0)
+                return EXIT_FAILURE;
+        }
+        else if(!strcmp(argv[0], "--rotate270"))
+        {
+            if(pipi_command(ctx, "rotate270") != 0)
+                return EXIT_FAILURE;
+        }
         else if(!strcmp(argv[0], "--invert"))
         {
             if(pipi_command(ctx, "invert") != 0)