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pixel: add NewImageFromBytes function #713

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merged 2 commits into from
Oct 27, 2024
Merged

pixel: add NewImageFromBytes function #713

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pixel: add NewImageFromBytes() function to allow creating image from …
deadprogram Oct 26, 2024
6301627
pixel: correct and clarify code for monochrome get/set pixels
deadprogram Oct 27, 2024
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48 changes: 42 additions & 6 deletions pixel/image.go
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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] {
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Should this return (Image[T], error) instead of panicking?

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That is the current interface, which I was not trying to change in this PR.

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])
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This isn't safe. If you create this from a plain old byte slice ([]byte) and the alignment of the new slice is different, this can lead to crashes on simpler cores like Cortex-M0 and I think even miscompiles (undefined behavior) which can result in any behavior and will be difficult to debug.

This applies to RGB565BE and RGB555 which have an underlying type of []uint16.

To check for this, you can do something like this:

if zeroColor.BitsPerPixel() % 8 == 0 && uintptr(data) % unsafe.Alignof(zeroColor) != 0 {
    panic("NewImageFromBytes: byte buffer is not aligned")
}

But really, if you allocate the slice using any normal Go way (global variable, make([]byte, ...), etc) there is no guarantee the byte slice is correctly aligned. If you want to be absolutely sure and don't want to rely on this behavior (and therefore exclude formats like RGB565BE and RGB555), you can also use a check like this:

if zeroColor.BitsPerPixel() % 8 == 0 && unsafe.Alignof(zeroColor) > 1 {
    panic("NewImageFromBytes: cannot convert byte buffer to image (different alignment)")
}

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I will add a new PR with that additional check, since this code is specifically for mono.

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
Comment on lines -108 to +142
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You are also changing the format here! The offset calculation changed and now outputs different values.

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See above comment.


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)))
Comment on lines -112 to +148
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You are changing the format here! Specifically, this reverses the order of the bits in the Monochrome color type, thus breaking programs that were using pixel.Monochrome before with the old format.

If you want to add a new format, please do so by adding a new pixel type instead.

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I think I was the only one trying to use this format, and I did not complete that work (on Thumby) due to this code being incorrect in the current form. So I am pretty sure this is fixing something broken, not introducing a new format.

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Ok, seems reasonable.
Though we might want to add a test for this: just a small monochrome image (5 x 3 pixels or so - intentionally with a weird size) and check whether it is equivalent to a PNG image for example.

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Good suggestion, I will do that in the same PR in which I add the alignment check.

}

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
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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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0x00, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xE8, 0x17, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF8, 0x00, 0x07, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xC0,
0x3F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC, 0x3F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFE,
0x3F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFC, 0x3F, 0xFF, 0xFF, 0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0xFF, 0xFF, 0xFE,
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0x3F, 0xFF, 0xFC, 0x01, 0xF8, 0x00, 0x5F, 0xFF, 0xFF, 0xFC, 0x00, 0x02, 0x80, 0x1F, 0xFF, 0xFE, 0x3F, 0xFF, 0xFC, 0x03, 0xFE, 0x03, 0xFF, 0xFD, 0xBF, 0xFF, 0x80, 0x1F, 0xE0, 0x3F, 0xFF, 0xFC,
0x3F, 0xFF, 0xFC, 0x03, 0xFE, 0x01, 0xFF, 0xF7, 0x6B, 0xFF, 0x80, 0x1F, 0xC0, 0x1F, 0xFF, 0xFE, 0x02, 0xFF, 0xFC, 0x03, 0xDF, 0x17, 0xFA, 0x00, 0x00, 0x37, 0xF0, 0x3F, 0xE0, 0x1F, 0xFF, 0xD0,
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0x3F, 0xFF, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x80, 0x00, 0x00, 0x00, 0x1C, 0x1F, 0xFF, 0xFE, 0x7F, 0xFF, 0xF8, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1E, 0x1F, 0xFF, 0xFE,
0x3F, 0xFF, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1C, 0x1F, 0xFF, 0xFE, 0x7F, 0xFF, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1E, 0x1F, 0xFF, 0xFE,
0x3F, 0xFF, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1C, 0x1F, 0xFF, 0xFE, 0x7F, 0xFF, 0xF8, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1C, 0x1F, 0xFF, 0xFE,
0x7F, 0xFF, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1E, 0x1F, 0xFF, 0xFE, 0x3F, 0xFF, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1C, 0x1F, 0xFF, 0xFE,
0x7F, 0xFF, 0xFC, 0x38, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x16, 0x1F, 0xFF, 0xFE, 0x0B, 0xFF, 0xF8, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1C, 0x1F, 0xFF, 0xF8,
0x00, 0x7F, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1E, 0x1F, 0xFE, 0x00, 0x00, 0x01, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1C, 0x1F, 0xC0, 0x00,
0x00, 0x03, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x16, 0x1F, 0x80, 0x00, 0x00, 0x01, 0xF8, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1C, 0x1F, 0xC0, 0x00,
0x00, 0x01, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1E, 0x1F, 0x80, 0x00, 0x00, 0x01, 0xFC, 0x38, 0x15, 0xB7, 0x80, 0x00, 0x00, 0x3E, 0x00, 0x00, 0x1C, 0x1F, 0xC0, 0x00,
0x00, 0x01, 0xF8, 0x3C, 0x16, 0xAB, 0x00, 0x00, 0x00, 0x52, 0x00, 0x00, 0x16, 0x1F, 0x80, 0x00, 0x00, 0x01, 0xFC, 0x3C, 0x3F, 0xFB, 0x80, 0x00, 0x00, 0xFF, 0x80, 0x00, 0x1C, 0x1F, 0xC0, 0x00,
0x00, 0x01, 0xFC, 0x3C, 0x1F, 0xE9, 0x00, 0x00, 0x01, 0xF7, 0x80, 0x00, 0x1E, 0x1F, 0x80, 0x00, 0x00, 0x01, 0xF8, 0x3C, 0x03, 0x82, 0x1D, 0xC6, 0x39, 0xC0, 0x07, 0x00, 0x14, 0x1F, 0xC0, 0x00,
0x00, 0x01, 0xFC, 0x3C, 0x03, 0x87, 0x14, 0x85, 0x15, 0xC1, 0x03, 0x80, 0x1E, 0x1F, 0x80, 0x00, 0x00, 0x01, 0xFC, 0x3C, 0x03, 0x87, 0x9F, 0xE6, 0x3D, 0xC0, 0x1F, 0xC0, 0x1C, 0x1F, 0xC0, 0x00,
0x00, 0xBF, 0xF8, 0x3C, 0x03, 0x83, 0x9F, 0xE7, 0x3F, 0x8D, 0x1E, 0xC0, 0x16, 0x1F, 0xD4, 0x00, 0x17, 0xFF, 0xFC, 0x3C, 0x03, 0x83, 0x9E, 0xE7, 0x79, 0xD7, 0xBC, 0xE0, 0x1C, 0x1F, 0xFF, 0xE8,
0x1F, 0xFF, 0xFC, 0x3C, 0x03, 0x83, 0x9C, 0xE3, 0x3F, 0x9F, 0xBC, 0xE0, 0x1E, 0x1F, 0xFF, 0xD0, 0x3F, 0xFF, 0xF8, 0x3C, 0x03, 0x83, 0x9E, 0xE7, 0x79, 0xC7, 0xBC, 0xE0, 0x16, 0x1F, 0xFF, 0xFE,
0x3F, 0xFF, 0xFC, 0x3C, 0x03, 0x83, 0xBC, 0xE3, 0xF9, 0xC3, 0xBC, 0xE0, 0x1C, 0x1F, 0xFF, 0xFC, 0x3F, 0xFF, 0xFC, 0x3C, 0x03, 0x83, 0x9E, 0xEB, 0xE9, 0xE3, 0xBD, 0xE0, 0x1E, 0x1F, 0xFF, 0xFE,
0x3F, 0xFF, 0xF8, 0x3C, 0x03, 0x83, 0x9C, 0xE3, 0xF1, 0xC3, 0x9C, 0xC0, 0x1C, 0x1F, 0xFF, 0xFC, 0x3F, 0xFF, 0xFC, 0x3C, 0x03, 0x83, 0x9E, 0xE9, 0xE0, 0xFF, 0x9F, 0xC0, 0x16, 0x1F, 0xFF, 0xFE,
0x3F, 0xFF, 0xFC, 0x3C, 0x03, 0x83, 0xBC, 0x61, 0xE0, 0xFF, 0x07, 0xC0, 0x1E, 0x1F, 0xFF, 0xFE, 0x3F, 0xFF, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x00, 0xC0, 0x00, 0x00, 0x00, 0x1C, 0x3F, 0xFF, 0xFC,
0x3F, 0xFF, 0xF8, 0x3C, 0x00, 0x00, 0x00, 0x00, 0xE0, 0x00, 0x00, 0x00, 0x1E, 0x1F, 0xFF, 0xFE, 0x3F, 0xFF, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x07, 0xC0, 0x00, 0x00, 0x00, 0x1C, 0x1F, 0xFF, 0xFC,
0x3F, 0xFF, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x17, 0xC0, 0x00, 0x00, 0x00, 0x16, 0x3F, 0xFF, 0xFE, 0x3F, 0xFF, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x1E, 0x3F, 0xFF, 0xFE,
0x3F, 0xFF, 0xFC, 0x3C, 0x00, 0x00, 0x00, 0x05, 0x00, 0x00, 0x00, 0x00, 0x1E, 0x3F, 0xFF, 0xFC, 0x3F, 0xFF, 0xFE, 0x3C, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x1C, 0x7F, 0xFF, 0xFE,
0x2F, 0xFF, 0xFF, 0xBC, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x88, 0x80, 0x5F, 0xFF, 0xFF, 0xF8, 0x00, 0x7F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00,
0x01, 0x3F, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xA0, 0x00, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xF0, 0x00,
0x00, 0x01, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x00,
0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x80, 0x00, 0x00, 0x00, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
}

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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