* Add the --scale flag. Resizes the image like --geometry, except with

relative parameters.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2716 92316355-f0b4-4df1-b90c-862c8a59935f

pipi/context.c

@@ -167,6 +167,31 @@ int pipi_command(pipi_context_t *ctx, char const *cmd, ...)
         pipi_free(src);
         ctx->images[ctx->nimages - 1] = dst;
     }
+    else if(!strcmp(cmd, "scale"))
+    {
+        pipi_image_t *src, *dst;
+        char const *arg;
+        va_list ap;
+        double scale;
+        int w, h;
+
+        if(ctx->nimages < 1)
+            return -1;
+        src = ctx->images[ctx->nimages - 1];
+        va_start(ap, cmd);
+        arg = va_arg(ap, char const *);
+        va_end(ap);
+        scale = atof(arg);
+        w = (int)(scale * src->w + 0.5);
+        h = (int)(scale * src->h + 0.5);
+        if(w <= 0 || h <= 0)
+            return -1;
+        dst = pipi_resize(src, w, h);
+        if(dst == NULL)
+            return -1;
+        pipi_free(src);
+        ctx->images[ctx->nimages - 1] = dst;
+    }
     else if(!strcmp(cmd, "mean"))
     {
         pipi_image_t *dst;

src/pipi.c

@@ -25,6 +25,14 @@ int main(int argc, char *argv[])
             if(pipi_command(ctx, "swap") != 0)
                 return EXIT_FAILURE;
         }
+        else if(!strcmp(argv[0], "--scale"))
+        {
+            if(argv[1] == NULL)
+                return EXIT_FAILURE;
+            if(pipi_command(ctx, "scale", argv[1]) != 0)
+                return EXIT_FAILURE;
+            argv++;
+        }
         else if(!strcmp(argv[0], "--geometry"))
         {
             if(argv[1] == NULL)