Transparency support for D3D swap chain #837
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eymar
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Dec 7, 2023
igordmn
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Dec 12, 2023
igordmn
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Dec 12, 2023
As was always before, and for all other renderer API on Windows. I wrote comment with explanation here: #915: ComposeWindowDelegate.desktop.kt R112-R120 /*
* Windows makes clicks on transparent pixels fall through, but it doesn't work
* with GPU accelerated rendering since this check requires having access to pixels from CPU.My position here is to DROP |
igordmn
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## Proposed Changes
- Adopt an approach that we're using for iOS - using custom blending to
respect clip/shape modifiers and overlapped drawings.
- Fix bounds in window calculation - it should work properly inside
scaled content now.
## Testing
The new behavior is under a feature flag, so you can test it by setting
system property:
```kt
System.setProperty("compose.interop.blending", "true")
```
Currently it supports Metal (macOS), Direct3D (Windows) (requires
JetBrains/skiko#837), and off-screen rendering
(might be enable by another feature flag:
`compose.swing.render.on.graphics`)
### Clipping
```kt
SwingPanel(
modifier = Modifier.clip(RoundedCornerShape(6.dp))
...
)
```
<img width="262" alt="image"
src="https://github.com/JetBrains/compose-multiplatform-core/assets/1836384/a03926f5-8977-4530-8894-d84aedfd5939">
### Overlapping
```kt
Box(modifier = Modifier.fillMaxSize()) {
SwingPanel(factory = {
JPanel().also { panel ->
panel.background = java.awt.Color.red
panel.add(JButton().also { button ->
button.text = "JButton"
})
}
})
Snackbar(
action = { Button(onClick = {}) { Text("OK") } },
modifier = Modifier.padding(8.dp).align(Alignment.BottomCenter),
) {
Text("Snackbar")
}
Popup(alignment = Alignment.Center) {
Box(
modifier = Modifier.size(200.dp, 100.dp).background(Gray),
contentAlignment = Alignment.Center,
) {
Text("Popup")
}
}
}
```
<img width="592" alt="Screenshot 2023-11-27 at 13 57 43"
src="https://github.com/JetBrains/compose-multiplatform-core/assets/1836384/dda1f2d6-6a1e-456c-8763-46a82d9562a8">
## Issues Fixed
Fixes JetBrains/compose-multiplatform#3823
Fixes JetBrains/compose-multiplatform#3739
Fixes JetBrains/compose-multiplatform#3353
Fixes JetBrains/compose-multiplatform#3474
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Required for JetBrains/compose-multiplatform-core#915
Fixes #327