screenshot: add screenshot-window support for DWL/MangoWC

core/cmd/dms/commands_screenshot.go

@@ -35,7 +35,7 @@ Modes:
   full        - Capture the focused output
   all         - Capture all outputs combined
   output      - Capture a specific output by name
-  window      - Capture the focused window (Hyprland only)
+  window      - Capture the focused window (Hyprland/DWL)
   last        - Capture the last selected region
 
 Output format (--format):
@@ -91,9 +91,8 @@ If no previous region exists, falls back to interactive selection.`,
 var ssWindowCmd = &cobra.Command{
 	Use:   "window",
 	Short: "Capture the focused window",
-	Long: `Capture the currently focused window.
-Currently only supported on Hyprland.`,
-	Run: runScreenshotWindow,
+	Long:  `Capture the currently focused window. Supported on Hyprland and DWL.`,
+	Run:   runScreenshotWindow,
 }
 
 var ssListCmd = &cobra.Command{

core/internal/screenshot/compositor.go

@@ -5,6 +5,10 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+
+	"github.com/AvengeMedia/DankMaterialShell/core/internal/proto/dwl_ipc"
+	wlhelpers "github.com/AvengeMedia/DankMaterialShell/core/internal/wayland/client"
+	"github.com/AvengeMedia/DankMaterialShell/core/pkg/go-wayland/wayland/client"
 )
 
 type Compositor int
@@ -44,10 +48,42 @@ func DetectCompositor() Compositor {
 		return detectedCompositor
 	}
 
+	if detectDWLProtocol() {
+		detectedCompositor = CompositorDWL
+		return detectedCompositor
+	}
+
 	detectedCompositor = CompositorUnknown
 	return detectedCompositor
 }
 
+func detectDWLProtocol() bool {
+	display, err := client.Connect("")
+	if err != nil {
+		return false
+	}
+	ctx := display.Context()
+	defer ctx.Close()
+
+	registry, err := display.GetRegistry()
+	if err != nil {
+		return false
+	}
+
+	found := false
+	registry.SetGlobalHandler(func(e client.RegistryGlobalEvent) {
+		if e.Interface == dwl_ipc.ZdwlIpcManagerV2InterfaceName {
+			found = true
+		}
+	})
+
+	if err := wlhelpers.Roundtrip(display, ctx); err != nil {
+		return false
+	}
+
+	return found
+}
+
 func SetCompositorDWL() {
 	detectedCompositor = CompositorDWL
 }
@@ -57,14 +93,18 @@ type WindowGeometry struct {
 	Y      int32
 	Width  int32
 	Height int32
+	Output string
+	Scale  float64
 }
 
 func GetActiveWindow() (*WindowGeometry, error) {
 	switch DetectCompositor() {
 	case CompositorHyprland:
 		return getHyprlandActiveWindow()
+	case CompositorDWL:
+		return getDWLActiveWindow()
 	default:
-		return nil, fmt.Errorf("window capture requires Hyprland")
+		return nil, fmt.Errorf("window capture requires Hyprland or DWL")
 	}
 }
 
@@ -220,7 +260,112 @@ func SetDWLActiveOutput(name string) {
 }
 
 func getDWLFocusedMonitor() string {
-	return dwlActiveOutput
+	if dwlActiveOutput != "" {
+		return dwlActiveOutput
+	}
+	return queryDWLActiveOutput()
+}
+
+func queryDWLActiveOutput() string {
+	display, err := client.Connect("")
+	if err != nil {
+		return ""
+	}
+	ctx := display.Context()
+	defer ctx.Close()
+
+	registry, err := display.GetRegistry()
+	if err != nil {
+		return ""
+	}
+
+	var dwlManager *dwl_ipc.ZdwlIpcManagerV2
+	outputs := make(map[uint32]*client.Output)
+
+	registry.SetGlobalHandler(func(e client.RegistryGlobalEvent) {
+		switch e.Interface {
+		case dwl_ipc.ZdwlIpcManagerV2InterfaceName:
+			mgr := dwl_ipc.NewZdwlIpcManagerV2(ctx)
+			if err := registry.Bind(e.Name, e.Interface, e.Version, mgr); err == nil {
+				dwlManager = mgr
+			}
+		case client.OutputInterfaceName:
+			out := client.NewOutput(ctx)
+			version := e.Version
+			if version > 4 {
+				version = 4
+			}
+			if err := registry.Bind(e.Name, e.Interface, version, out); err == nil {
+				outputs[e.Name] = out
+			}
+		}
+	})
+
+	if err := wlhelpers.Roundtrip(display, ctx); err != nil {
+		return ""
+	}
+
+	if dwlManager == nil || len(outputs) == 0 {
+		return ""
+	}
+
+	outputNames := make(map[uint32]string)
+	for name, out := range outputs {
+		n := name
+		out.SetNameHandler(func(e client.OutputNameEvent) {
+			outputNames[n] = e.Name
+		})
+	}
+
+	if err := wlhelpers.Roundtrip(display, ctx); err != nil {
+		return ""
+	}
+
+	type outputState struct {
+		name     string
+		active   bool
+		gotFrame bool
+	}
+	states := make(map[uint32]*outputState)
+
+	for name, out := range outputs {
+		dwlOut, err := dwlManager.GetOutput(out)
+		if err != nil {
+			continue
+		}
+		state := &outputState{name: outputNames[name]}
+		states[name] = state
+
+		dwlOut.SetActiveHandler(func(e dwl_ipc.ZdwlIpcOutputV2ActiveEvent) {
+			state.active = e.Active != 0
+		})
+		dwlOut.SetFrameHandler(func(e dwl_ipc.ZdwlIpcOutputV2FrameEvent) {
+			state.gotFrame = true
+		})
+	}
+
+	allFramesReceived := func() bool {
+		for _, s := range states {
+			if !s.gotFrame {
+				return false
+			}
+		}
+		return true
+	}
+
+	for !allFramesReceived() {
+		if err := ctx.Dispatch(); err != nil {
+			return ""
+		}
+	}
+
+	for _, state := range states {
+		if state.active {
+			return state.name
+		}
+	}
+
+	return ""
 }
 
 func GetFocusedMonitor() string {
@@ -236,3 +381,143 @@ func GetFocusedMonitor() string {
 	}
 	return ""
 }
+
+func getDWLActiveWindow() (*WindowGeometry, error) {
+	display, err := client.Connect("")
+	if err != nil {
+		return nil, fmt.Errorf("connect: %w", err)
+	}
+	ctx := display.Context()
+	defer ctx.Close()
+
+	registry, err := display.GetRegistry()
+	if err != nil {
+		return nil, fmt.Errorf("get registry: %w", err)
+	}
+
+	var dwlManager *dwl_ipc.ZdwlIpcManagerV2
+	outputs := make(map[uint32]*client.Output)
+
+	registry.SetGlobalHandler(func(e client.RegistryGlobalEvent) {
+		switch e.Interface {
+		case dwl_ipc.ZdwlIpcManagerV2InterfaceName:
+			mgr := dwl_ipc.NewZdwlIpcManagerV2(ctx)
+			if err := registry.Bind(e.Name, e.Interface, e.Version, mgr); err == nil {
+				dwlManager = mgr
+			}
+		case client.OutputInterfaceName:
+			out := client.NewOutput(ctx)
+			version := e.Version
+			if version > 4 {
+				version = 4
+			}
+			if err := registry.Bind(e.Name, e.Interface, version, out); err == nil {
+				outputs[e.Name] = out
+			}
+		}
+	})
+
+	if err := wlhelpers.Roundtrip(display, ctx); err != nil {
+		return nil, fmt.Errorf("roundtrip: %w", err)
+	}
+
+	if dwlManager == nil {
+		return nil, fmt.Errorf("dwl_ipc_manager not available")
+	}
+
+	if len(outputs) == 0 {
+		return nil, fmt.Errorf("no outputs found")
+	}
+
+	outputNames := make(map[uint32]string)
+	for name, out := range outputs {
+		n := name
+		out.SetNameHandler(func(e client.OutputNameEvent) {
+			outputNames[n] = e.Name
+		})
+	}
+
+	if err := wlhelpers.Roundtrip(display, ctx); err != nil {
+		return nil, fmt.Errorf("roundtrip: %w", err)
+	}
+
+	type dwlOutputState struct {
+		output      *dwl_ipc.ZdwlIpcOutputV2
+		name        string
+		active      bool
+		x, y        int32
+		w, h        int32
+		scalefactor uint32
+		gotFrame    bool
+	}
+
+	dwlOutputs := make(map[uint32]*dwlOutputState)
+	for name, out := range outputs {
+		dwlOut, err := dwlManager.GetOutput(out)
+		if err != nil {
+			continue
+		}
+		state := &dwlOutputState{output: dwlOut, name: outputNames[name]}
+		dwlOutputs[name] = state
+
+		dwlOut.SetActiveHandler(func(e dwl_ipc.ZdwlIpcOutputV2ActiveEvent) {
+			state.active = e.Active != 0
+		})
+		dwlOut.SetXHandler(func(e dwl_ipc.ZdwlIpcOutputV2XEvent) {
+			state.x = e.X
+		})
+		dwlOut.SetYHandler(func(e dwl_ipc.ZdwlIpcOutputV2YEvent) {
+			state.y = e.Y
+		})
+		dwlOut.SetWidthHandler(func(e dwl_ipc.ZdwlIpcOutputV2WidthEvent) {
+			state.w = e.Width
+		})
+		dwlOut.SetHeightHandler(func(e dwl_ipc.ZdwlIpcOutputV2HeightEvent) {
+			state.h = e.Height
+		})
+		dwlOut.SetScalefactorHandler(func(e dwl_ipc.ZdwlIpcOutputV2ScalefactorEvent) {
+			state.scalefactor = e.Scalefactor
+		})
+		dwlOut.SetFrameHandler(func(e dwl_ipc.ZdwlIpcOutputV2FrameEvent) {
+			state.gotFrame = true
+		})
+	}
+
+	allFramesReceived := func() bool {
+		for _, s := range dwlOutputs {
+			if !s.gotFrame {
+				return false
+			}
+		}
+		return true
+	}
+
+	for !allFramesReceived() {
+		if err := ctx.Dispatch(); err != nil {
+			return nil, fmt.Errorf("dispatch: %w", err)
+		}
+	}
+
+	for _, state := range dwlOutputs {
+		if !state.active {
+			continue
+		}
+		if state.w <= 0 || state.h <= 0 {
+			return nil, fmt.Errorf("no active window")
+		}
+		scale := float64(state.scalefactor) / 100.0
+		if scale <= 0 {
+			scale = 1.0
+		}
+		return &WindowGeometry{
+			X:      state.x,
+			Y:      state.y,
+			Width:  state.w,
+			Height: state.h,
+			Output: state.name,
+			Scale:  scale,
+		}, nil
+	}
+
+	return nil, fmt.Errorf("no active output found")
+}

core/internal/screenshot/screenshot.go

@@ -135,16 +135,138 @@ func (s *Screenshoter) captureWindow() (*CaptureResult, error) {
 		Height: geom.Height,
 	}
 
-	output := s.findOutputForRegion(region)
+	var output *WaylandOutput
+	if geom.Output != "" {
+		output = s.findOutputByName(geom.Output)
+	}
+	if output == nil {
+		output = s.findOutputForRegion(region)
+	}
 	if output == nil {
 		return nil, fmt.Errorf("could not find output for window")
 	}
 
-	if DetectCompositor() == CompositorHyprland {
+	switch DetectCompositor() {
+	case CompositorHyprland:
 		return s.captureAndCrop(output, region)
+	case CompositorDWL:
+		return s.captureDWLWindow(output, region, geom.Scale)
+	default:
+		return s.captureRegionOnOutput(output, region)
+	}
+}
+
+func (s *Screenshoter) captureDWLWindow(output *WaylandOutput, region Region, dwlScale float64) (*CaptureResult, error) {
+	result, err := s.captureWholeOutput(output)
+	if err != nil {
+		return nil, err
 	}
 
-	return s.captureRegionOnOutput(output, region)
+	scale := dwlScale
+	if scale <= 0 {
+		scale = float64(result.Buffer.Width) / float64(output.width)
+	}
+	if scale <= 0 {
+		scale = 1.0
+	}
+
+	localX := int(float64(region.X) * scale)
+	localY := int(float64(region.Y) * scale)
+	if localX >= result.Buffer.Width {
+		localX = localX % result.Buffer.Width
+	}
+	if localY >= result.Buffer.Height {
+		localY = localY % result.Buffer.Height
+	}
+
+	w := int(float64(region.Width) * scale)
+	h := int(float64(region.Height) * scale)
+
+	if localY+h > result.Buffer.Height && h <= result.Buffer.Height {
+		localY = result.Buffer.Height - h
+		if localY < 0 {
+			localY = 0
+		}
+	}
+	if localX+w > result.Buffer.Width && w <= result.Buffer.Width {
+		localX = result.Buffer.Width - w
+		if localX < 0 {
+			localX = 0
+		}
+	}
+
+	if localX < 0 {
+		w += localX
+		localX = 0
+	}
+	if localY < 0 {
+		h += localY
+		localY = 0
+	}
+	if localX+w > result.Buffer.Width {
+		w = result.Buffer.Width - localX
+	}
+	if localY+h > result.Buffer.Height {
+		h = result.Buffer.Height - localY
+	}
+
+	if w <= 0 || h <= 0 {
+		result.Buffer.Close()
+		return nil, fmt.Errorf("window not visible on output")
+	}
+
+	cropped, err := CreateShmBuffer(w, h, w*4)
+	if err != nil {
+		result.Buffer.Close()
+		return nil, fmt.Errorf("create crop buffer: %w", err)
+	}
+
+	srcData := result.Buffer.Data()
+	dstData := cropped.Data()
+
+	for y := 0; y < h; y++ {
+		srcY := localY + y
+		if result.YInverted {
+			srcY = result.Buffer.Height - 1 - (localY + y)
+		}
+		if srcY < 0 || srcY >= result.Buffer.Height {
+			continue
+		}
+
+		dstY := y
+		if result.YInverted {
+			dstY = h - 1 - y
+		}
+
+		for x := 0; x < w; x++ {
+			srcX := localX + x
+			if srcX < 0 || srcX >= result.Buffer.Width {
+				continue
+			}
+
+			si := srcY*result.Buffer.Stride + srcX*4
+			di := dstY*cropped.Stride + x*4
+
+			if si+3 >= len(srcData) || di+3 >= len(dstData) {
+				continue
+			}
+
+			dstData[di+0] = srcData[si+0]
+			dstData[di+1] = srcData[si+1]
+			dstData[di+2] = srcData[si+2]
+			dstData[di+3] = srcData[si+3]
+		}
+	}
+
+	result.Buffer.Close()
+	cropped.Format = PixelFormat(result.Format)
+
+	return &CaptureResult{
+		Buffer:    cropped,
+		Region:    region,
+		YInverted: false,
+		Format:    result.Format,
+	}, nil
 }
 
 func (s *Screenshoter) captureFullScreen() (*CaptureResult, error) {
@@ -457,6 +579,31 @@ func (s *Screenshoter) captureRegionOnOutput(output *WaylandOutput, region Regio
 	w := int32(float64(region.Width) * scale)
 	h := int32(float64(region.Height) * scale)
 
+	if DetectCompositor() == CompositorDWL {
+		scaledOutW := int32(float64(output.width) * scale)
+		scaledOutH := int32(float64(output.height) * scale)
+		if localX >= scaledOutW {
+			localX = localX % scaledOutW
+		}
+		if localY >= scaledOutH {
+			localY = localY % scaledOutH
+		}
+		if localX+w > scaledOutW {
+			w = scaledOutW - localX
+		}
+		if localY+h > scaledOutH {
+			h = scaledOutH - localY
+		}
+		if localX < 0 {
+			w += localX
+			localX = 0
+		}
+		if localY < 0 {
+			h += localY
+			localY = 0
+		}
+	}
+
 	cursor := int32(0)
 	if s.config.IncludeCursor {
 		cursor = 1
@@ -557,6 +704,17 @@ func (s *Screenshoter) processFrame(frame *wlr_screencopy.ZwlrScreencopyFrameV1,
 	}, nil
 }
 
+func (s *Screenshoter) findOutputByName(name string) *WaylandOutput {
+	s.outputsMu.Lock()
+	defer s.outputsMu.Unlock()
+	for _, o := range s.outputs {
+		if o.name == name {
+			return o
+		}
+	}
+	return nil
+}
+
 func (s *Screenshoter) findOutputForRegion(region Region) *WaylandOutput {
 	s.outputsMu.Lock()
 	defer s.outputsMu.Unlock()