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Allow framebuffers larger than virtual resolution #10

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Merged
merged 1 commit into from
Aug 18, 2024
Merged

Allow framebuffers larger than virtual resolution #10

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8 changes: 4 additions & 4 deletions internal/fb/fb.go
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Original file line number Diff line number Diff line change
Expand Up @@ -84,8 +84,8 @@ func (d *Device) Image() (draw.Image, error) {
// The Linux efifb driver typically defaults to 32 bpp.

virtual := image.Rect(0, 0, int(vinfo.Xres_virtual), int(vinfo.Yres_virtual))
if virtual.Dx()*virtual.Dy()*4 != len(d.mmap) {
return nil, errors.New("virtual resolution doesn't match framebuffer size")
if virtual.Dx()*virtual.Dy()*4 > len(d.mmap) {
return nil, errors.New("framebuffer is too small")
}
visual := image.Rect(int(vinfo.Xoffset), int(vinfo.Yoffset), int(vinfo.Xres), int(vinfo.Yres))
if !visual.In(virtual) {
Expand All @@ -108,8 +108,8 @@ func (d *Device) Image() (draw.Image, error) {
// Blue:{Offset:0 Length:5 Right:0} Transp:{Offset:0 Length:0 Right:0} Nonstd:0 Activate:0 Height:290 Width:520 Accel_flags:1 Pixclock:0 Left_margin:0 Right_margin:0 Upper_margin:0 Lower_margin:0 Hsync_len:0 Vsync_len:0 Sync:0 Vmode:0 Rotate:0 Colorspace:0 Reserved:[0 0 0 0]}

virtual := image.Rect(0, 0, int(vinfo.Xres_virtual), int(vinfo.Yres_virtual))
if virtual.Dx()*virtual.Dy()*2 != len(d.mmap) {
return nil, errors.New("virtual resolution doesn't match framebuffer size")
if virtual.Dx()*virtual.Dy()*2 > len(d.mmap) {
return nil, errors.New("framebuffer is too small")
}
visual := image.Rect(int(vinfo.Xoffset), int(vinfo.Yoffset), int(vinfo.Xres), int(vinfo.Yres))
if !visual.In(virtual) {
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