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# Phase 6 — Visual Effects (Compositor Features)
---
## Step 6.1 — Window decorations (title bars)
For each managed window, draw a simple title bar above it:
- A colored rectangle.
- The window title (from `WM_NAME` or `_NET_WM_NAME` property).
- A close button (clickable, sends `WM_DELETE_WINDOW`).
Use raylib's `DrawRectangle()` and `DrawText()`.
**Verify:** Each window has a title bar showing its name. Clicking the
close button closes the window.
---
## Step 6.2 — Drop shadows
Draw a soft shadow behind each window. Approach:
- Precompute a shadow texture (gaussian blur of a solid rect) at startup.
- Draw it as a 9-slice scaled quad behind each window, offset down and
right by a few pixels.
Or use raylib's shader system with a blur shader on an expanded quad.
**Verify:** Each window has a soft drop shadow. Overlapping windows show
correct shadow layering.
---
## Step 6.3 — Window transparency / opacity
Read `_NET_WM_WINDOW_OPACITY` from each window's properties. Apply it
when drawing the texture (raylib's `DrawTexturePro` with tint alpha, or
a custom shader uniform).
**Verify:** Run:
```bash
DISPLAY=:1 xprop -f _NET_WM_WINDOW_OPACITY 32c \
-set _NET_WM_WINDOW_OPACITY 0x7FFFFFFF -id <wid>
```
to set 50% opacity on a window. It becomes translucent in the compositor.
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