mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-12-25 09:26:16 +03:00
Add support for reading animated WebP files
This commit is contained in:
Jason Douglas
parent
6e4766155d
commit
482d803717
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@ -28,24 +28,134 @@ class WebPImageFile(ImageFile.ImageFile):
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format_description = "WebP image"
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def _open(self):
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data, width, height, self.mode, icc_profile, exif = \
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_webp.WebPDecode(self.fp.read())
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if not _webp.HAVE_WEBPMUX:
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# Legacy mode
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data, width, height, self.mode = _webp.WebPDecode(self.fp.read())
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self.size = width, height
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self.fp = BytesIO(data)
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self.tile = [("raw", (0, 0) + self.size, 0, self.mode)]
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return
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# Use the newer AnimDecoder API to parse the (possibly) animated file,
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# and access muxed chunks like ICC/EXIF/XMP.
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self._decoder = _webp.WebPAnimDecoder(self.fp.read())
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# Get info from decoder
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width, height, loop_count, bgcolor, frame_count, mode = self._decoder.get_info()
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self.size = width, height
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self.info["loop"] = loop_count
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bg_a, bg_r, bg_g, bg_b = \
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(bgcolor >> 24) & 0xFF, \
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(bgcolor >> 16) & 0xFF, \
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(bgcolor >> 8) & 0xFF, \
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bgcolor & 0xFF
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self.info["background"] = (bg_r, bg_g, bg_b, bg_a)
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self._n_frames = frame_count
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self.mode = mode
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self.tile = []
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# Attempt to read ICC / EXIF / XMP chunks from file
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icc_profile = self._decoder.get_chunk("ICCP")
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exif = self._decoder.get_chunk("EXIF")
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xmp = self._decoder.get_chunk("XMP ")
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if icc_profile:
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self.info["icc_profile"] = icc_profile
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if exif:
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self.info["exif"] = exif
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if xmp:
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self.info["xmp"] = xmp
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self.size = width, height
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self.fp = BytesIO(data)
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self.tile = [("raw", (0, 0) + self.size, 0, self.mode)]
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# Initialize seek state
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self._reset(reset=False)
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self.seek(0)
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def _getexif(self):
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from .JpegImagePlugin import _getexif
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return _getexif(self)
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@property
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def n_frames(self):
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if not _webp.HAVE_WEBPMUX:
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return 1
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return self._n_frames
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@property
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def is_animated(self):
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if not _webp.HAVE_WEBPMUX:
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return False
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return self._n_frames > 1
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def seek(self, frame):
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# Perform some simple checks first
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if frame >= self._n_frames:
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raise EOFError("attempted to seek beyond end of sequence")
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if frame < 0:
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raise EOFError("negative frame index is not valid")
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# Set logical frame to requested position
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self.__logical_frame = frame
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def _reset(self, reset=True):
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if reset:
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self._decoder.reset()
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self.__physical_frame = 0
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self.__loaded = -1
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self.__timestamp = 0
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def _get_next(self):
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# Get next frame
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ret = self._decoder.get_next()
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self.__physical_frame += 1
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# Check if an error occurred
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if ret is None:
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self._reset() # Reset just to be safe
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self.seek(0)
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raise EOFError("failed to decode next frame in WebP file")
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# Compute duration
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data, timestamp = ret
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duration = timestamp - self.__timestamp
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self.__timestamp = timestamp
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timestamp -= duration # libwebp gives frame end, adjust to start of frame
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return data, timestamp, duration
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def _seek(self, frame):
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if self.__physical_frame == frame:
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return # Nothing to do
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if frame < self.__physical_frame:
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# Rewind to beginning
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self._reset()
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# Advance to the requested frame
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while self.__physical_frame < frame:
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self._get_next()
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def load(self):
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if self.__loaded != self.__logical_frame:
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self._seek(self.__logical_frame)
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# We need to load the image data for this frame
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data, timestamp, duration = self._get_next()
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self.info["timestamp"] = timestamp
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self.info["duration"] = duration
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self.__loaded = self.__logical_frame
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# Set tile
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self.fp = BytesIO(data)
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self.tile = [("raw", (0, 0) + self.size, 0, self.mode)]
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return super(WebPImageFile, self).load()
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def tell(self):
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return self.__logical_frame
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def _save_all(im, fp, filename):
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if not _webp.HAVE_WEBPMUX:
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_save(im, fp, filename)
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return
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encoderinfo = im.encoderinfo.copy()
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append_images = encoderinfo.get("append_images", [])
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background = encoderinfo.get("background", (0, 0, 0, 0))
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@ -105,7 +215,10 @@ def _save_all(im, fp, filename):
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ims.load()
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# Make sure image mode is supported
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frame = ims if ims.mode in _VALID_WEBP_MODES else ims.convert("RGBA")
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frame = ims
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if not ims.mode in _VALID_WEBP_MODES:
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alpha = 'A' in ims.im.getpalettemode()
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frame = image.convert('RGBA' if alpha else 'RGB')
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# Append the frame to the animation encoder
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enc.add(
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@ -139,11 +252,15 @@ def _save_all(im, fp, filename):
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fp.write(data)
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def _save(im, fp, filename):
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if _webp.HAVE_WEBPMUX:
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_save_all(im, fp, filename)
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return
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image_mode = im.mode
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if im.mode not in _VALID_WEBP_MODES:
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im = im.convert("RGBA")
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alpha = 'A' in im.im.getpalettemode()
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im = im.convert('RGBA' if alpha else 'RGB')
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lossless = im.encoderinfo.get("lossless", False)
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quality = im.encoderinfo.get("quality", 80)
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273
_webp.c
273
_webp.c
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@ -8,13 +8,13 @@
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#ifdef HAVE_WEBPMUX
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#include <webp/mux.h>
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#endif
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#include <webp/demux.h>
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/* -------------------------------------------------------------------- */
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/* WebP Animation Support */
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/* -------------------------------------------------------------------- */
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#ifdef HAVE_WEBPMUX
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// Encoder type
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typedef struct {
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PyObject_HEAD
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WebPAnimEncoder* enc;
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@ -23,6 +23,17 @@ typedef struct {
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static PyTypeObject WebPAnimEncoder_Type;
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// Decoder type
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typedef struct {
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PyObject_HEAD
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WebPAnimDecoder* dec;
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WebPAnimInfo info;
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WebPData data;
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} WebPAnimDecoderObject;
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static PyTypeObject WebPAnimDecoder_Type;
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// Encoder functions
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PyObject* _anim_encoder_new(PyObject* self, PyObject* args)
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{
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int width, height;
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@ -177,10 +188,207 @@ PyObject* _anim_encoder_assemble(PyObject* self, PyObject* args)
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return ret;
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}
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#endif
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// Decoder functions
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PyObject* _anim_decoder_new(PyObject* self, PyObject* args)
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{
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PyBytesObject *webp_string;
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const uint8_t *webp;
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Py_ssize_t size;
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if (!PyArg_ParseTuple(args, "S", &webp_string)) {
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return NULL;
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}
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PyBytes_AsStringAndSize((PyObject *) webp_string, (char**)&webp, &size);
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WebPData webp_src = {webp, size};
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// Create the decoder (default mode is RGBA, if no options passed)
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WebPAnimDecoderObject* decp;
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decp = PyObject_New(WebPAnimDecoderObject, &WebPAnimDecoder_Type);
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if (decp) {
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if (WebPDataCopy(&webp_src, &(decp->data))) {
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WebPAnimDecoder* dec = WebPAnimDecoderNew(&(decp->data), NULL);
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if (dec) {
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if (WebPAnimDecoderGetInfo(dec, &(decp->info))) {
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decp->dec = dec;
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return (PyObject*) decp;
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}
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}
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}
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PyObject_Del(decp);
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}
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fprintf(stderr, "Error! Could not create decoder object.\n");
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Py_RETURN_NONE;
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}
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PyObject* _anim_decoder_dealloc(PyObject* self)
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{
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WebPAnimDecoderObject* decp = (WebPAnimDecoderObject *)self;
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WebPDataClear(&(decp->data));
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WebPAnimDecoderDelete(decp->dec);
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Py_RETURN_NONE;
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}
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PyObject* _anim_decoder_get_info(PyObject* self, PyObject* args)
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{
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WebPAnimDecoderObject* decp = (WebPAnimDecoderObject *)self;
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WebPAnimInfo* info = &(decp->info);
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return Py_BuildValue("IIIIIs",
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info->canvas_width, info->canvas_height,
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info->loop_count,
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info->bgcolor,
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info->frame_count,
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"RGBA" // WebPAnimDecoder defaults to RGBA if no mode is specified
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);
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}
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PyObject* _anim_decoder_get_chunk(PyObject* self, PyObject* args)
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{
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char *mode;
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PyObject *ret;
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WebPChunkIterator iter;
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if (!PyArg_ParseTuple(args, "s", &mode)) {
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return NULL;
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}
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WebPAnimDecoderObject* decp = (WebPAnimDecoderObject *)self;
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const WebPDemuxer* demux = WebPAnimDecoderGetDemuxer(decp->dec);
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if (!WebPDemuxGetChunk(demux, mode, 1, &iter)) {
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Py_RETURN_NONE;
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}
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ret = PyBytes_FromStringAndSize((const char*)iter.chunk.bytes, iter.chunk.size);
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WebPDemuxReleaseChunkIterator(&iter);
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return ret;
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}
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PyObject* _anim_decoder_get_next(PyObject* self, PyObject* args)
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{
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uint8_t* buf;
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int timestamp;
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PyObject *bytes;
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WebPAnimDecoderObject* decp = (WebPAnimDecoderObject *)self;
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if (!WebPAnimDecoderGetNext(decp->dec, &buf, ×tamp)) {
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fprintf(stderr, "Error! Failed to read next frame.\n");
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Py_RETURN_NONE;
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}
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bytes = PyBytes_FromStringAndSize((char *)buf,
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decp->info.canvas_width * 4 * decp->info.canvas_height);
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return Py_BuildValue("Si", bytes, timestamp);
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}
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PyObject* _anim_decoder_has_more_frames(PyObject* self, PyObject* args)
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{
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WebPAnimDecoderObject* decp = (WebPAnimDecoderObject *)self;
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return Py_BuildValue("i", WebPAnimDecoderHasMoreFrames(decp->dec));
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}
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PyObject* _anim_decoder_reset(PyObject* self, PyObject* args)
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{
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WebPAnimDecoderObject* decp = (WebPAnimDecoderObject *)self;
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WebPAnimDecoderReset(decp->dec);
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Py_RETURN_NONE;
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}
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/* -------------------------------------------------------------------- */
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/* WebP Single-Frame Support */
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/* Type Definitions */
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/* -------------------------------------------------------------------- */
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// WebPAnimEncoder methods
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static struct PyMethodDef _anim_encoder_methods[] = {
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{"add", (PyCFunction)_anim_encoder_add, METH_VARARGS, "add"},
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{"assemble", (PyCFunction)_anim_encoder_assemble, METH_VARARGS, "assemble"},
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{NULL, NULL} /* sentinel */
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};
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// WebPAnimDecoder type definition
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static PyTypeObject WebPAnimEncoder_Type = {
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PyVarObject_HEAD_INIT(NULL, 0)
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"WebPAnimEncoder", /*tp_name */
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sizeof(WebPAnimEncoderObject), /*tp_size */
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0, /*tp_itemsize */
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/* methods */
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(destructor)_anim_encoder_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number */
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0, /*tp_as_sequence */
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0, /*tp_as_mapping */
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0, /*tp_hash*/
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0, /*tp_call*/
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0, /*tp_str*/
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0, /*tp_getattro*/
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0, /*tp_setattro*/
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0, /*tp_as_buffer*/
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Py_TPFLAGS_DEFAULT, /*tp_flags*/
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0, /*tp_doc*/
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0, /*tp_traverse*/
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0, /*tp_clear*/
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0, /*tp_richcompare*/
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0, /*tp_weaklistoffset*/
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0, /*tp_iter*/
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0, /*tp_iternext*/
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_anim_encoder_methods, /*tp_methods*/
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0, /*tp_members*/
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0, /*tp_getset*/
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};
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// WebPAnimDecoder methods
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static struct PyMethodDef _anim_decoder_methods[] = {
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{"get_info", (PyCFunction)_anim_decoder_get_info, METH_VARARGS, "get_info"},
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{"get_chunk", (PyCFunction)_anim_decoder_get_chunk, METH_VARARGS, "get_chunk"},
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{"get_next", (PyCFunction)_anim_decoder_get_next, METH_VARARGS, "get_next"},
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{"has_more_frames", (PyCFunction)_anim_decoder_has_more_frames, METH_VARARGS, "has_more_frames"},
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{"reset", (PyCFunction)_anim_decoder_reset, METH_VARARGS, "reset"},
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{NULL, NULL} /* sentinel */
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};
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// WebPAnimDecoder type definition
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static PyTypeObject WebPAnimDecoder_Type = {
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PyVarObject_HEAD_INIT(NULL, 0)
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"WebPAnimDecoder", /*tp_name */
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sizeof(WebPAnimDecoderObject), /*tp_size */
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0, /*tp_itemsize */
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/* methods */
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(destructor)_anim_decoder_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number */
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0, /*tp_as_sequence */
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0, /*tp_as_mapping */
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0, /*tp_hash*/
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0, /*tp_call*/
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0, /*tp_str*/
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0, /*tp_getattro*/
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0, /*tp_setattro*/
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0, /*tp_as_buffer*/
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Py_TPFLAGS_DEFAULT, /*tp_flags*/
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0, /*tp_doc*/
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0, /*tp_traverse*/
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0, /*tp_clear*/
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0, /*tp_richcompare*/
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0, /*tp_weaklistoffset*/
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0, /*tp_iter*/
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0, /*tp_iternext*/
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_anim_decoder_methods, /*tp_methods*/
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0, /*tp_members*/
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0, /*tp_getset*/
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};
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#endif
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#ifdef HAVE_WEBPMUX
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/* -------------------------------------------------------------------- */
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/* Legacy WebP Support */
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/* -------------------------------------------------------------------- */
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PyObject* WebPEncode_wrapper(PyObject* self, PyObject* args)
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@ -410,6 +618,8 @@ end:
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return ret;
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}
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#endif
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// Return the decoder's version number, packed in hexadecimal using 8bits for
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// each of major/minor/revision. E.g: v2.5.7 is 0x020507.
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PyObject* WebPDecoderVersion_wrapper(PyObject* self, PyObject* args){
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@ -428,54 +638,6 @@ PyObject* WebPDecoderBuggyAlpha_wrapper(PyObject* self, PyObject* args){
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return Py_BuildValue("i", WebPDecoderBuggyAlpha());
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}
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/* -------------------------------------------------------------------- */
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/* WebPAnimEncoder Type */
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/* -------------------------------------------------------------------- */
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#ifdef HAVE_WEBPMUX
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static struct PyMethodDef _anim_encoder_methods[] = {
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{"add", (PyCFunction)_anim_encoder_add, 1},
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{"assemble", (PyCFunction)_anim_encoder_assemble, 1},
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{NULL, NULL} /* sentinel */
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};
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/* type description */
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static PyTypeObject WebPAnimEncoder_Type = {
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PyVarObject_HEAD_INIT(NULL, 0)
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"WebPAnimEncoder", /*tp_name */
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sizeof(WebPAnimEncoderObject), /*tp_size */
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0, /*tp_itemsize */
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/* methods */
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(destructor)_anim_encoder_dealloc, /*tp_dealloc*/
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0, /*tp_print*/
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0, /*tp_getattr*/
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0, /*tp_setattr*/
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0, /*tp_compare*/
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0, /*tp_repr*/
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0, /*tp_as_number */
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0, /*tp_as_sequence */
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0, /*tp_as_mapping */
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0, /*tp_hash*/
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0, /*tp_call*/
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0, /*tp_str*/
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0, /*tp_getattro*/
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0, /*tp_setattro*/
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0, /*tp_as_buffer*/
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Py_TPFLAGS_DEFAULT, /*tp_flags*/
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0, /*tp_doc*/
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0, /*tp_traverse*/
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0, /*tp_clear*/
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0, /*tp_richcompare*/
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0, /*tp_weaklistoffset*/
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0, /*tp_iter*/
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0, /*tp_iternext*/
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_anim_encoder_methods, /*tp_methods*/
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0, /*tp_members*/
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0, /*tp_getset*/
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};
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#endif
|
||||
|
||||
/* -------------------------------------------------------------------- */
|
||||
/* Module Setup */
|
||||
/* -------------------------------------------------------------------- */
|
||||
|
|
@ -483,10 +645,12 @@ static PyTypeObject WebPAnimEncoder_Type = {
|
|||
static PyMethodDef webpMethods[] =
|
||||
{
|
||||
#ifdef HAVE_WEBPMUX
|
||||
{"WebPAnimDecoder", _anim_decoder_new, METH_VARARGS, "WebPAnimDecoder"},
|
||||
{"WebPAnimEncoder", _anim_encoder_new, METH_VARARGS, "WebPAnimEncoder"},
|
||||
#endif
|
||||
#else
|
||||
{"WebPEncode", WebPEncode_wrapper, METH_VARARGS, "WebPEncode"},
|
||||
{"WebPDecode", WebPDecode_wrapper, METH_VARARGS, "WebPDecode"},
|
||||
#endif
|
||||
{"WebPDecoderVersion", WebPDecoderVersion_wrapper, METH_VARARGS, "WebPVersion"},
|
||||
{"WebPDecoderBuggyAlpha", WebPDecoderBuggyAlpha_wrapper, METH_VARARGS, "WebPDecoderBuggyAlpha"},
|
||||
{NULL, NULL}
|
||||
|
|
@ -511,7 +675,8 @@ static int setup_module(PyObject* m) {
|
|||
|
||||
#ifdef HAVE_WEBPMUX
|
||||
/* Ready object types */
|
||||
if (PyType_Ready(&WebPAnimEncoder_Type) < 0)
|
||||
if (PyType_Ready(&WebPAnimDecoder_Type) < 0 ||
|
||||
PyType_Ready(&WebPAnimEncoder_Type) < 0)
|
||||
return -1;
|
||||
#endif
|
||||
return 0;
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user