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Allow getpalette() to return less than 256 colors

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This commit is contained in:
Andrew Murray 2022-02-16 09:56:13 +11:00
parent 10e1731149
commit 948c064b28
5 changed files with 11 additions and 7 deletions
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1
Tests/test_image_putpalette.py
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@ -74,4 +74,5 @@ def test_putpalette_with_alpha_values():
def test_rgba_palette(mode, palette): def test_rgba_palette(mode, palette):
im = Image.new("P", (1, 1)) im = Image.new("P", (1, 1))
im.putpalette(palette, mode) im.putpalette(palette, mode)
assert im.getpalette() == [1, 2, 3]
assert im.palette.colors == {(1, 2, 3, 4): 0} assert im.palette.colors == {(1, 2, 3, 4): 0}

6
src/PIL/Image.py
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@ -821,7 +821,7 @@ class Image:
if self.im and self.palette and self.palette.dirty: if self.im and self.palette and self.palette.dirty:
# realize palette # realize palette
mode, arr = self.palette.getdata() mode, arr = self.palette.getdata()
palette_length = self.im.putpalette(mode, arr) self.im.putpalette(mode, arr)
self.palette.dirty = 0 self.palette.dirty = 0
self.palette.rawmode = None self.palette.rawmode = None
if "transparency" in self.info and mode in ("LA", "PA"): if "transparency" in self.info and mode in ("LA", "PA"):
@ -833,9 +833,7 @@ class Image:
else: else:
palette_mode = "RGBA" if mode.startswith("RGBA") else "RGB" palette_mode = "RGBA" if mode.startswith("RGBA") else "RGB"
self.palette.mode = palette_mode self.palette.mode = palette_mode
self.palette.palette = self.im.getpalette(palette_mode, palette_mode)[ self.palette.palette = self.im.getpalette(palette_mode, palette_mode)
: palette_length * len(palette_mode)
]
if self.im: if self.im:
if cffi and USE_CFFI_ACCESS: if cffi and USE_CFFI_ACCESS:

9
src/_imaging.c
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@ -1063,7 +1063,7 @@ _gaussian_blur(ImagingObject *self, PyObject *args) {
static PyObject * static PyObject *
_getpalette(ImagingObject *self, PyObject *args) { _getpalette(ImagingObject *self, PyObject *args) {
PyObject *palette; PyObject *palette;
int palettesize = 256; int palettesize;
int bits; int bits;
ImagingShuffler pack; ImagingShuffler pack;
@ -1084,6 +1084,7 @@ _getpalette(ImagingObject *self, PyObject *args) {
return NULL; return NULL;
} }
palettesize = self->image->palette->size;
palette = PyBytes_FromStringAndSize(NULL, palettesize * bits / 8); palette = PyBytes_FromStringAndSize(NULL, palettesize * bits / 8);
if (!palette) { if (!palette) {
return NULL; return NULL;
@ -1672,9 +1673,11 @@ _putpalette(ImagingObject *self, PyObject *args) {
self->image->palette = ImagingPaletteNew(palette_mode); self->image->palette = ImagingPaletteNew(palette_mode);
unpack(self->image->palette->palette, palette, palettesize * 8 / bits); self->image->palette->size = palettesize * 8 / bits;
unpack(self->image->palette->palette, palette, self->image->palette->size);
return PyLong_FromLong(palettesize * 8 / bits); Py_INCREF(Py_None);
return Py_None;
} }
static PyObject * static PyObject *

1
src/libImaging/Imaging.h
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@ -143,6 +143,7 @@ struct ImagingPaletteInstance {
char mode[IMAGING_MODE_LENGTH]; /* Band names */ char mode[IMAGING_MODE_LENGTH]; /* Band names */
/* Data */ /* Data */
int size;
UINT8 palette[1024]; /* Palette data (same format as image data) */ UINT8 palette[1024]; /* Palette data (same format as image data) */
INT16 *cache; /* Palette cache (used for predefined palettes) */ INT16 *cache; /* Palette cache (used for predefined palettes) */

1
src/libImaging/Palette.c
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@ -40,6 +40,7 @@ ImagingPaletteNew(const char *mode) {
palette->mode[IMAGING_MODE_LENGTH - 1] = 0; palette->mode[IMAGING_MODE_LENGTH - 1] = 0;
/* Initialize to ramp */ /* Initialize to ramp */
palette->size = 256;
for (i = 0; i < 256; i++) { for (i = 0; i < 256; i++) {
palette->palette[i * 4 + 0] = palette->palette[i * 4 + 1] = palette->palette[i * 4 + 0] = palette->palette[i * 4 + 1] =
palette->palette[i * 4 + 2] = (UINT8)i; palette->palette[i * 4 + 2] = (UINT8)i;