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pixel: add NewImageFromBytes function (#713)
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* pixel: add NewImageFromBytes() function to allow creating image from existing slice

Signed-off-by: deadprogram <[email protected]>

* pixel: correct and clarify code for monochrome get/set pixels

Signed-off-by: deadprogram <[email protected]>

---------

Signed-off-by: deadprogram <[email protected]>
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@deadprogram
deadprogram authored Oct 27, 2024
1 parent f12454d commit 4fb5d7a
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Showing 2 changed files with 134 additions and 16 deletions.
48 changes: 42 additions & 6 deletions pixel/image.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,40 @@ func NewImage[T Color](width, height int) Image[T] {
}
}

// NewImageFromBytes creates a new image of the given size using an existing data slice of bytes.
func NewImageFromBytes[T Color](width, height int, buf []byte) Image[T] {
if width < 0 || height < 0 || int(int16(width)) != width || int(int16(height)) != height {
// The width/height are stored as 16-bit integers and should never be
// negative.
panic("NewImageFromBytes: width/height out of bounds")
}
var zeroColor T
var data unsafe.Pointer
switch {
case zeroColor.BitsPerPixel()%8 == 0:
// Typical formats like RGB888 and RGB565.
// Each color starts at a whole byte offset from the start.
if len(buf) != width*height*int(unsafe.Sizeof(zeroColor)) {
panic("NewImageFromBytes: data slice size mismatch")
}
data = unsafe.Pointer(&buf[0])
default:
// Formats like RGB444 that have 12 bits per pixel.
// We access these as bytes, so allocate the buffer as a byte slice.
bufBits := width * height * zeroColor.BitsPerPixel()
bufBytes := (bufBits + 7) / 8
if len(buf) != bufBytes {
panic("NewImageFromBytes: data slice size mismatch")
}
data = unsafe.Pointer(&buf[0])
}
return Image[T]{
width: int16(width),
height: int16(height),
data: data,
}
}

// Rescale returns a new Image buffer based on the img buffer.
// The contents is undefined after the Rescale operation, and any modification
// to the returned image will overwrite the underlying image buffer in undefined
Expand Down Expand Up @@ -105,14 +139,15 @@ func (img Image[T]) setPixel(index int, c T) {
case zeroColor.BitsPerPixel() == 1:
// Monochrome.
x := index % int(img.width)
y := index / int(img.width)
offset := x + (y/8)*int(img.width)
offset := index / 8

ptr := (*byte)(unsafe.Add(img.data, offset))
if c != zeroColor {
*((*byte)(ptr)) |= 1 << uint8(y%8)
*((*byte)(ptr)) |= (1 << (7 - uint8(x%8)))
} else {
*((*byte)(ptr)) &^= 1 << uint8(y%8)
*((*byte)(ptr)) &^= (1 << (7 - uint8(x%8)))
}

return
case zeroColor.BitsPerPixel()%8 == 0:
// Each color starts at a whole byte offset.
Expand Down Expand Up @@ -166,9 +201,10 @@ func (img Image[T]) Get(x, y int) T {
case zeroColor.BitsPerPixel() == 1:
// Monochrome.
var c Monochrome
offset := x + (y/8)*int(img.width)
offset := index / 8
bits := index - (offset * 8)
ptr := (*byte)(unsafe.Add(img.data, offset))
c = (*ptr >> uint8(y%8) & 0x1) == 1
c = ((*ptr >> (7 - uint8(bits))) & 0x1) > 0
return any(c).(T)
case zeroColor.BitsPerPixel()%8 == 0:
// Colors like RGB565, RGB888, etc.
Expand Down
102 changes: 92 additions & 10 deletions pixel/image_test.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -66,9 +66,9 @@ func TestImageRGB444BE(t *testing.T) {
}

func TestImageMonochrome(t *testing.T) {
image := pixel.NewImage[pixel.Monochrome](5, 3)
if width, height := image.Size(); width != 5 && height != 3 {
t.Errorf("image.Size(): expected 5, 3 but got %d, %d", width, height)
image := pixel.NewImage[pixel.Monochrome](128, 64)
if width, height := image.Size(); width != 128 && height != 64 {
t.Errorf("image.Size(): expected 128, 64 but got %d, %d", width, height)
}
for _, expected := range []color.RGBA{
{R: 0xff, G: 0xff, B: 0xff},
Expand All @@ -80,19 +80,101 @@ func TestImageMonochrome(t *testing.T) {
{B: 0x00, A: 0xff},
} {
encoded := pixel.NewColor[pixel.Monochrome](expected.R, expected.G, expected.B)
image.Set(4, 2, encoded)
actual := image.Get(4, 2).RGBA()
image.Set(5, 3, encoded)
actual := image.Get(5, 3).RGBA()
switch {
case expected.R == 0 && expected.G == 0 && expected.B == 0:
// should be false eg black
if actual.R != 0 || actual.G != 0 || actual.B != 0 {
t.Errorf("failed to roundtrip color: expected %v but got %v", expected, actual)
}
case int(expected.R)+int(expected.G)+int(expected.B) > 128*3:
// should be true eg white
if actual.R == 0 || actual.G == 0 || actual.B == 0 {
t.Errorf("failed to roundtrip color: expected %v but got %v", expected, actual)
}
default:
// should be false eg black
if actual.R != 0 || actual.G != 0 || actual.B != 0 {
t.Errorf("failed to roundtrip color: expected %v but got %v", expected, actual)
}
}
}
}

// 128x128
var rprofile = []byte{
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}

func TestImageFromBytesMonochrome(t *testing.T) {
image := pixel.NewImageFromBytes[pixel.Monochrome](128, 128, rprofile)
if width, height := image.Size(); width != 128 && height != 128 {
t.Errorf("image.Size(): expected 128, 128 but got %d, %d", width, height)
}

raw := image.RawBuffer()
for i, b := range raw {
if b != rprofile[i] {
t.Fatalf("failed to roundtrip image. expected %v but got %v", rprofile[i], b)
}
}
}
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