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https://github.com/python-pillow/Pillow.git
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Added DXT5 saving
This commit is contained in:
parent
3dbd0e57ba
commit
9430bbe5a1
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@ -398,21 +398,48 @@ def test_save(mode: str, test_file: str, tmp_path: Path) -> None:
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def test_save_dxt1(tmp_path: Path) -> None:
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# RGB
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out = str(tmp_path / "temp.dds")
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with Image.open(TEST_FILE_DXT1) as im:
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im.convert("RGB").save(out, pixel_format="DXT1")
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assert_image_similar_tofile(im, out, 1.84)
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# RGBA
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im_alpha = im.copy()
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im_alpha.putpixel((0, 0), (0, 0, 0, 0))
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im_alpha.save(out, pixel_format="DXT1")
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with Image.open(out) as reloaded:
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assert reloaded.getpixel((0, 0)) == (0, 0, 0, 0)
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# L
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im_l = im.convert("L")
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im_l.save(out, pixel_format="DXT1")
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assert_image_similar_tofile(im_l.convert("RGBA"), out, 9.25)
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assert_image_similar_tofile(im_l.convert("RGBA"), out, 6.07)
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# LA
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im_alpha.convert("LA").save(out, pixel_format="DXT1")
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with Image.open(out) as reloaded:
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assert reloaded.getpixel((0, 0)) == (0, 0, 0, 0)
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def test_save_dxt5(tmp_path: Path) -> None:
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# RGB
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out = str(tmp_path / "temp.dds")
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with Image.open(TEST_FILE_DXT1) as im:
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im.convert("RGB").save(out, pixel_format="DXT5")
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assert_image_similar_tofile(im, out, 1.84)
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# RGBA
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with Image.open(TEST_FILE_DXT5) as im_rgba:
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im_rgba.save(out, pixel_format="DXT5")
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assert_image_similar_tofile(im_rgba, out, 3.69)
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# L
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im_l = im.convert("L")
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im_l.save(out, pixel_format="DXT5")
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assert_image_similar_tofile(im_l.convert("RGBA"), out, 6.07)
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# LA
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im_la = im_rgba.convert("LA")
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im_la.save(out, pixel_format="DXT5")
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assert_image_similar_tofile(im_la.convert("RGBA"), out, 8.32)
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@ -520,8 +520,16 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
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flags = DDSD.CAPS | DDSD.HEIGHT | DDSD.WIDTH | DDSD.PIXELFORMAT
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bitcount = len(im.getbands()) * 8
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raw = im.encoderinfo.get("pixel_format") != "DXT1"
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if raw:
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pixel_format = im.encoderinfo.get("pixel_format")
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if pixel_format in ("DXT1", "DXT5"):
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codec_name = "bcn"
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flags |= DDSD.LINEARSIZE
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pitch = (im.width + 3) * 4
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args = pixel_format
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rgba_mask = [0, 0, 0, 0]
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pixel_flags = DDPF.FOURCC
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fourcc = D3DFMT.DXT1 if pixel_format == "DXT1" else D3DFMT.DXT5
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else:
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codec_name = "raw"
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flags |= DDSD.PITCH
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pitch = (im.width * bitcount + 7) // 8
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@ -529,14 +537,14 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
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alpha = im.mode[-1] == "A"
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if im.mode[0] == "L":
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pixel_flags = DDPF.LUMINANCE
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rawmode = im.mode
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args = im.mode
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if alpha:
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rgba_mask = [0x000000FF, 0x000000FF, 0x000000FF]
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else:
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rgba_mask = [0xFF000000, 0xFF000000, 0xFF000000]
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else:
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pixel_flags = DDPF.RGB
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rawmode = im.mode[::-1]
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args = im.mode[::-1]
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rgba_mask = [0x00FF0000, 0x0000FF00, 0x000000FF]
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if alpha:
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@ -546,15 +554,7 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
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pixel_flags |= DDPF.ALPHAPIXELS
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rgba_mask.append(0xFF000000 if alpha else 0)
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fourcc = 0
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else:
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codec_name = "bcn"
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flags |= DDSD.LINEARSIZE
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pitch = (im.width + 3) * 4
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rawmode = None
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rgba_mask = [0, 0, 0, 0]
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pixel_flags = DDPF.FOURCC
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fourcc = D3DFMT.DXT1
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fourcc = D3DFMT.UNKNOWN
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fp.write(
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o32(DDS_MAGIC)
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+ struct.pack(
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@ -573,7 +573,7 @@ def _save(im: Image.Image, fp: IO[bytes], filename: str | bytes) -> None:
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+ struct.pack("<4I", *rgba_mask) # dwRGBABitMask
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+ struct.pack("<5I", DDSCAPS.TEXTURE, 0, 0, 0, 0)
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)
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ImageFile._save(im, fp, [ImageFile._Tile(codec_name, (0, 0) + im.size, 0, rawmode)])
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ImageFile._save(im, fp, [ImageFile._Tile(codec_name, (0, 0) + im.size, 0, args)])
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def _accept(prefix: bytes) -> bool:
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11
src/encode.c
11
src/encode.c
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@ -27,6 +27,7 @@
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#include "thirdparty/pythoncapi_compat.h"
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#include "libImaging/Imaging.h"
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#include "libImaging/Bcn.h"
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#include "libImaging/Gif.h"
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#ifdef HAVE_UNISTD_H
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@ -358,13 +359,21 @@ PyObject *
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PyImaging_BcnEncoderNew(PyObject *self, PyObject *args) {
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ImagingEncoderObject *encoder;
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encoder = PyImaging_EncoderNew(0);
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char *mode;
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char *pixel_format;
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if (!PyArg_ParseTuple(args, "ss", &mode, &pixel_format)) {
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return NULL;
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}
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encoder = PyImaging_EncoderNew(sizeof(BCNSTATE));
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if (encoder == NULL) {
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return NULL;
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}
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encoder->encode = ImagingBcnEncode;
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((BCNSTATE *)encoder->state.context)->pixel_format = pixel_format;
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return (PyObject *)encoder;
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}
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@ -17,8 +17,7 @@ typedef struct {
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} rgb;
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typedef struct {
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UINT8 color[3];
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int alpha;
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UINT8 color[4];
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} rgba;
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static rgb
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@ -46,116 +45,198 @@ encode_565(rgba item) {
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return (r << (5 + 6)) | (g << 5) | b;
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}
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static void
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encode_bc1_color(Imaging im, ImagingCodecState state, UINT8 *dst, int separate_alpha) {
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int i, j, k;
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UINT16 color_min = 0, color_max = 0;
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rgb color_min_rgb, color_max_rgb;
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rgba block[16], *current_rgba;
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// Determine the min and max colors in this 4x4 block
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int first = 1;
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int transparency = 0;
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for (i = 0; i < 4; i++) {
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for (j = 0; j < 4; j++) {
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int x = state->x + i * im->pixelsize;
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int y = state->y + j;
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if (x >= state->xsize * im->pixelsize || y >= state->ysize) {
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// The 4x4 block extends past the edge of the image
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continue;
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}
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current_rgba = &block[i + j * 4];
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for (k = 0; k < 3; k++) {
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current_rgba->color[k] =
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(UINT8)im->image[y][x + (im->pixelsize == 1 ? 0 : k)];
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}
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if (separate_alpha) {
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if ((UINT8)im->image[y][x + 3] == 0) {
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current_rgba->color[3] = 0;
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transparency = 1;
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continue;
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} else {
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current_rgba->color[3] = 1;
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}
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}
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UINT16 color = encode_565(*current_rgba);
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if (first || color < color_min) {
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color_min = color;
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}
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if (first || color > color_max) {
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color_max = color;
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}
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first = 0;
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}
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}
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if (transparency) {
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*dst++ = color_min;
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*dst++ = color_min >> 8;
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}
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*dst++ = color_max;
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*dst++ = color_max >> 8;
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if (!transparency) {
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*dst++ = color_min;
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*dst++ = color_min >> 8;
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}
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color_min_rgb = decode_565(color_min);
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color_max_rgb = decode_565(color_max);
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for (i = 0; i < 4; i++) {
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UINT8 l = 0;
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for (j = 3; j > -1; j--) {
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current_rgba = &block[i * 4 + j];
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if (transparency && !current_rgba->color[3]) {
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l |= 3 << (j * 2);
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continue;
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}
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float distance = 0;
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int total = 0;
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for (k = 0; k < 3; k++) {
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float denom =
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(float)abs(color_max_rgb.color[k] - color_min_rgb.color[k]);
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if (denom != 0) {
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distance +=
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abs(current_rgba->color[k] - color_min_rgb.color[k]) / denom;
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total += 1;
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}
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}
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if (total == 0) {
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continue;
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}
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if (transparency) {
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distance *= 4 / total;
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if (distance < 1) {
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// color_max
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} else if (distance < 3) {
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l |= 2 << (j * 2); // 1/2 * color_min + 1/2 * color_max
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} else {
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l |= 1 << (j * 2); // color_min
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}
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} else {
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distance *= 6 / total;
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if (distance < 1) {
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l |= 1 << (j * 2); // color_min
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} else if (distance < 3) {
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l |= 3 << (j * 2); // 1/3 * color_min + 2/3 * color_max
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} else if (distance < 5) {
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l |= 2 << (j * 2); // 2/3 * color_min + 1/3 * color_max
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} else {
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// color_max
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}
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}
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}
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*dst++ = l;
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}
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}
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static void
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encode_bc3_alpha(Imaging im, ImagingCodecState state, UINT8 *dst) {
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int i, j;
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UINT8 alpha_min = 0, alpha_max = 0;
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UINT8 block[16], current_alpha;
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// Determine the min and max colors in this 4x4 block
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int first = 1;
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for (i = 0; i < 4; i++) {
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for (j = 0; j < 4; j++) {
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int x = state->x + i * im->pixelsize;
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int y = state->y + j;
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if (x >= state->xsize * im->pixelsize || y >= state->ysize) {
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// The 4x4 block extends past the edge of the image
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continue;
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}
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current_alpha = (UINT8)im->image[y][x + 3];
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block[i + j * 4] = current_alpha;
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if (first || current_alpha < alpha_min) {
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alpha_min = current_alpha;
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}
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if (first || current_alpha > alpha_max) {
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alpha_max = current_alpha;
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}
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first = 0;
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}
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}
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*dst++ = alpha_min;
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*dst++ = alpha_max;
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float denom = (float)abs(alpha_max - alpha_min);
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for (i = 0; i < 2; i++) {
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UINT32 l = 0;
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for (j = 7; j > -1; j--) {
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current_alpha = block[i * 8 + j];
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if (!current_alpha) {
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l |= 6 << (j * 3);
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continue;
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} else if (current_alpha == 255 || denom == 0) {
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l |= 7 << (j * 3);
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continue;
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}
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float distance = abs(current_alpha - alpha_min) / denom * 10;
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if (distance < 3) {
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l |= 2 << (j * 3); // 4/5 * alpha_min + 1/5 * alpha_max
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} else if (distance < 5) {
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l |= 3 << (j * 3); // 3/5 * alpha_min + 2/5 * alpha_max
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} else if (distance < 7) {
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l |= 4 << (j * 3); // 2/5 * alpha_min + 3/5 * alpha_max
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} else {
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l |= 5 << (j * 3); // 1/5 * alpha_min + 4/5 * alpha_max
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}
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}
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*dst++ = l;
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*dst++ = l >> 8;
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*dst++ = l >> 16;
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}
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}
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int
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ImagingBcnEncode(Imaging im, ImagingCodecState state, UINT8 *buf, int bytes) {
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char *pixel_format = ((BCNSTATE *)state->context)->pixel_format;
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int n = strcmp(pixel_format, "DXT5") == 0 ? 3 : 1;
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int has_alpha_channel =
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strcmp(im->mode, "RGBA") == 0 || strcmp(im->mode, "LA") == 0;
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UINT8 *dst = buf;
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for (;;) {
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int i, j, k;
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UINT16 color_min = 0, color_max = 0;
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rgb color_min_rgb, color_max_rgb;
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rgba block[16], *current_rgba;
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// Determine the min and max colors in this 4x4 block
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int has_alpha_channel =
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strcmp(im->mode, "RGBA") == 0 || strcmp(im->mode, "LA") == 0;
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int first = 1;
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int transparency = 0;
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for (i = 0; i < 4; i++) {
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for (j = 0; j < 4; j++) {
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int x = state->x + i * im->pixelsize;
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int y = state->y + j;
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if (x >= state->xsize * im->pixelsize || y >= state->ysize) {
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// The 4x4 block extends past the edge of the image
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continue;
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}
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current_rgba = &block[i + j * 4];
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for (k = 0; k < 3; k++) {
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current_rgba->color[k] =
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(UINT8)im->image[y][x + (im->pixelsize == 1 ? 0 : k)];
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}
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if (has_alpha_channel) {
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if ((UINT8)im->image[y][x + 3] == 0) {
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current_rgba->alpha = 0;
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transparency = 1;
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continue;
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} else {
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current_rgba->alpha = 1;
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}
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}
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UINT16 color = encode_565(*current_rgba);
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if (first || color < color_min) {
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color_min = color;
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}
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if (first || color > color_max) {
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color_max = color;
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}
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first = 0;
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}
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}
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if (transparency) {
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*dst++ = color_min;
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*dst++ = color_min >> 8;
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}
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*dst++ = color_max;
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*dst++ = color_max >> 8;
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if (!transparency) {
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*dst++ = color_min;
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*dst++ = color_min >> 8;
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}
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color_min_rgb = decode_565(color_min);
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color_max_rgb = decode_565(color_max);
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for (i = 0; i < 4; i++) {
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UINT8 l = 0;
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for (j = 3; j > -1; j--) {
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current_rgba = &block[i * 4 + j];
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if (transparency && !current_rgba->alpha) {
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l |= 3 << (j * 2);
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continue;
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}
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float distance = 0;
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int total = 0;
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for (k = 0; k < 3; k++) {
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float denom =
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(float)abs(color_max_rgb.color[k] - color_min_rgb.color[k]);
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if (denom != 0) {
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distance +=
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abs(current_rgba->color[k] - color_min_rgb.color[k]) /
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denom;
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total += 1;
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}
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}
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if (total == 0) {
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continue;
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}
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distance *= 6 / total;
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if (transparency) {
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if (distance < 1.5) {
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// color_max
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} else if (distance < 4.5) {
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l |= 2 << (j * 2); // 1/2 * color_min + 1/2 * color_max
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} else {
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l |= 1 << (j * 2); // color_min
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}
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} else {
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if (distance < 1) {
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l |= 1 << (j * 2); // color_min
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} else if (distance < 3) {
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l |= 3 << (j * 2); // 1/3 * color_min + 2/3 * color_max
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} else if (distance < 5) {
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l |= 2 << (j * 2); // 2/3 * color_min + 1/3 * color_max
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} else {
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// color_max
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}
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if (n == 3) {
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if (has_alpha_channel) {
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encode_bc3_alpha(im, state, dst);
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dst += 8;
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} else {
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for (int i = 0; i < 8; i++) {
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*dst++ = 0xff;
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}
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}
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*dst++ = l;
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}
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encode_bc1_color(im, state, dst, n == 1 && has_alpha_channel);
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dst += 8;
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state->x += im->pixelsize * 4;
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