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screenshot: initial support for scroll capture mode

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fixes #2871
port 1.5
This commit is contained in:
bbedward
2026-07-17 13:31:23 -04:00
parent 3c688cfbd3
commit f8fe16738e
13 changed files with 1866 additions and 72 deletions
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core/internal/screenshot/region_render.go
+78 -2
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@@ -57,7 +57,7 @@ func (r *RegionSelector) drawOverlay(os *OutputSurface, renderBuf *ShmBuffer) {
w, h := renderBuf.Width, renderBuf.Height
format := os.screenFormat
// Dim the entire buffer
// dim, forcing alpha: the X-format source's padding byte is undefined
for y := 0; y < h; y++ {
off := y * stride
for x := 0; x < w; x++ {
@@ -68,6 +68,7 @@ func (r *RegionSelector) drawOverlay(os *OutputSurface, renderBuf *ShmBuffer) {
data[i+0] = uint8(int(data[i+0]) * 3 / 5)
data[i+1] = uint8(int(data[i+1]) * 3 / 5)
data[i+2] = uint8(int(data[i+2]) * 3 / 5)
data[i+3] = 255
}
}
@@ -110,7 +111,7 @@ func (r *RegionSelector) drawOverlay(os *OutputSurface, renderBuf *ShmBuffer) {
data[di+0] = srcData[si+0]
data[di+1] = srcData[si+1]
data[di+2] = srcData[si+2]
data[di+3] = srcData[si+3]
data[di+3] = 255
}
}
@@ -126,6 +127,81 @@ func (r *RegionSelector) drawOverlay(os *OutputSurface, renderBuf *ShmBuffer) {
r.drawDimensions(data, stride, w, h, bx1, by1, selW, selH, format)
}
func (r *RegionSelector) drawScrollOverlay(os *OutputSurface, renderBuf *ShmBuffer) {
data := renderBuf.Data()
stride := renderBuf.Stride
w, h := renderBuf.Width, renderBuf.Height
// 40% premultiplied scrim
for y := 0; y < h; y++ {
off := y * stride
for x := 0; x < w; x++ {
i := off + x*4
if i+3 >= len(data) {
continue
}
data[i+0], data[i+1], data[i+2], data[i+3] = 0, 0, 0, 102
}
}
s := r.scroll
if s == nil || r.selection.surface != os {
return
}
// hole oversized 2px so overlay pixels never land in captured frames
holeX := s.holeX - 2
holeY := s.holeY - 2
holeW := s.holeW + 4
holeH := s.holeH + 4
x1 := clamp(holeX, 0, w)
y1 := clamp(holeY, 0, h)
x2 := clamp(holeX+holeW, 0, w)
y2 := clamp(holeY+holeH, 0, h)
for y := y1; y < y2; y++ {
off := y * stride
for x := x1; x < x2; x++ {
i := off + x*4
if i+3 >= len(data) {
continue
}
data[i+0], data[i+1], data[i+2], data[i+3] = 0, 0, 0, 0
}
}
r.drawBorder(data, stride, w, h, holeX-1, holeY-1, holeW+2, holeH+2, os.screenFormat)
r.drawScrollBar(data, stride, w, h, os.screenFormat)
}
func (r *RegionSelector) drawScrollBar(data []byte, stride, bufW, bufH int, format uint32) {
s := r.scroll
style := LoadOverlayStyle()
const charH = 12
r.fillRect(data, stride, bufW, bufH, s.barX, s.barY, s.barW, s.barH,
style.BackgroundR, style.BackgroundG, style.BackgroundB, 245, format)
labelY := s.doneY + (s.btnH-charH)/2
r.fillRect(data, stride, bufW, bufH, s.doneX, s.doneY, s.doneW, s.btnH,
style.AccentR, style.AccentG, style.AccentB, 255, format)
r.drawText(data, stride, bufW, bufH, s.doneX+12, labelY, "done", 10, 10, 10, format)
r.fillRect(data, stride, bufW, bufH, s.cancelX, s.cancelY, s.cancelW, s.btnH,
70, 70, 70, 255, format)
r.drawText(data, stride, bufW, bufH, s.cancelX+12, labelY, "cancel",
style.TextR, style.TextG, style.TextB, format)
rows := 0
if s.st != nil {
rows = s.st.rows()
}
counter := fmt.Sprintf("%d shots %dpx", s.kept, rows)
r.drawText(data, stride, bufW, bufH, s.cancelX+s.cancelW+16, labelY, counter,
style.TextR, style.TextG, style.TextB, format)
}
func (r *RegionSelector) drawHUD(data []byte, stride, bufW, bufH int, format uint32) {
if r.selection.dragging {
return