Fix reduce color depth to not use original data

(and break parentrel)

2 files changed, 16 insertions, 9 deletions

diff --git a/render/color.c b/render/color.c
index d5821c87..c2570720 100644
--- a/render/color.c
+++ b/render/color.c
@@ -65,12 +65,11 @@ void color_free(color_rgb *c)
 
 void reduce_depth(pixel32 *data, XImage *im)
 {
-    /* since pixel32 is the largest possible pixel size, we can share the
-       array*/
     int r, g, b;
     int x,y;
-    pixel16 *p16 = (pixel16*) data;
-    unsigned char *p8 = (unsigned char *)data;
+    pixel32 *p32 = (pixel32 *) im->data;
+    pixel16 *p16 = (pixel16 *) im->data;
+    unsigned char *p8 = (unsigned char *)im->data;
     switch (im->bits_per_pixel) {
     case 32:
         if ((render_red_offset != default_red_shift) ||
@@ -81,12 +80,14 @@ void reduce_depth(pixel32 *data, XImage *im)
                     r = (data[x] >> default_red_shift) & 0xFF;
                     g = (data[x] >> default_green_shift) & 0xFF;
                     b = (data[x] >> default_blue_shift) & 0xFF;
-                    data[x] = (r << render_red_offset) + (g << render_green_offset) +
-                        (b << render_blue_offset);
+                    p32[x] = (r << render_red_offset)
+                           + (g << render_green_offset)
+                           + (b << render_blue_offset);
                 }
                 data += im->width;
+                p32 += im->width;
             } 
-        }
+        } else im->data = data;
         break;
     case 16:
         for (y = 0; y < im->height; y++) {
diff --git a/render/render.c b/render/render.c
index be2b8310..42fdebe8 100644
--- a/render/render.c
+++ b/render/render.c
@@ -377,17 +377,23 @@ void appearance_free(Appearance *a)
 
 void pixel32_to_pixmap(pixel32 *in, Pixmap out, int x, int y, int w, int h)
 {
+    unsigned char *scratch;
     XImage *im = NULL;
     im = XCreateImage(ob_display, render_visual, render_depth,
                       ZPixmap, 0, NULL, w, h, 32, 0);
     g_assert(im != NULL);
     im->byte_order = endian;
-    im->data = (char *)in;
-    reduce_depth((pixel32*)im->data, im);
+/* this malloc is a complete waste of time on normal 32bpp
+   as reduce_depth just sets im->data = data and returns
+*/
+    scratch = malloc(im->width * im->height * sizeof(pixel32));
+    im->data = scratch;
+    reduce_depth(in, im);
     XPutImage(ob_display, out, DefaultGC(ob_display, ob_screen),
               im, 0, 0, x, y, w, h);
     im->data = NULL;
     XDestroyImage(im);
+    free(scratch);
 }
 
 void appearance_minsize(Appearance *l, Size *s)