added depth reduction and startup for true color visuals

[chaz/openbox] / render / color.c

diff --git a/render/color.c b/render/color.c
index 0cf7b226b2529d5fe4705ba455aa27199ce17130..10ad5e3b95cec7657ccd229fa4822dcb2f29448e 100644 (file)
--- a/render/color.c
+++ b/render/color.c
@@ -58,3 +58,48 @@ void color_free(color_rgb *c)
         XFreeGC(ob_display, c->gc);
     free(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 *p = (pixel16*) data;
+  switch (im->bits_per_pixel) {
+  case 32:
+    if ((render_red_offset != default_red_shift) ||
+        (render_blue_offset != default_blue_shift) ||
+        (render_green_offset != default_green_shift)) {
+      for (y = 0; y < im->height; y++) {
+        for (x = 0; x < im->width; x++) {
+          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);
+        }
+        data += im->width;
+      } 
+    }
+    break;
+  case 16:
+    for (y = 0; y < im->height; y++) {
+      for (x = 0; x < im->width; x++) {
+        r = (data[x] >> default_red_shift) & 0xFF;
+        r = r >> render_red_shift;
+        g = (data[x] >> default_green_shift) & 0xFF;
+        g = g >> render_green_shift;
+        b = (data[x] >> default_blue_shift) & 0xFF;
+        b = b >> render_blue_shift;
+        p[x] = (r << render_red_offset)
+             + (g << render_green_offset)
+             + (b << render_blue_offset);
+      }
+      data += im->width;
+      p += im->bytes_per_line/2;
+    }
+    break;
+  default:
+    g_message("your bit depth is currently unhandled\n");
+  }
+}