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Add Support for webp format #6035

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merged 9 commits into from
Feb 18, 2024
Merged

Add Support for webp format #6035

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de60640
add support for webp format
vanicoplug Dec 13, 2023
a539fa6
rename WEBP class & add test
vanicoplug Dec 18, 2023
58bdece
update test function for image
vanicoplug Dec 18, 2023
4b375ee
update webp image bytes
vanicoplug Dec 18, 2023
ea097fb
cover all webp formats
vanicoplug Dec 21, 2023
2837aed
Merge remote-tracking branch 'origin/main' into webp_image_support
philippjfr Feb 17, 2024
8931f9a
Fix webp header unpacking
philippjfr Feb 17, 2024
7d17a25
Readd support for lossy and lossless webp
philippjfr Feb 18, 2024
f8e17bb
Add WebP reference notebook
philippjfr Feb 18, 2024
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5 changes: 3 additions & 2 deletions examples/reference/panes/Image.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,8 @@
"outputs": [],
"source": [
"jpg_pane = pn.pane.Image('https://assets.holoviz.org/panel/samples/jpeg_sample.jpeg')\n",
"png_pane = pn.pane.Image('https://assets.holoviz.org/panel/samples/png_sample.png')"
"png_pane = pn.pane.Image('https://assets.holoviz.org/panel/samples/png_sample.png')\n",
"webp_pane = pn.pane.Image('https://mistral.ai/images/logo_hubc88c4ece131b91c7cb753f40e9e1cc5_2589_256x0_resize_q97_h2_lanczos_3.webp')"
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]
},
{
Expand All @@ -58,7 +59,7 @@
},
"outputs": [],
"source": [
"pn.Column(jpg_pane, png_pane)"
"pn.Column(jpg_pane, png_pane, webp_pane)"
]
},
{
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34 changes: 34 additions & 0 deletions panel/pane/image.py
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Expand Up @@ -496,3 +496,37 @@ def _transform_object(self, obj: Any) -> Dict[str, Any]:
page = f'#page={self.start_page}' if getattr(self, 'start_page', None) else ''
html = f'<embed src="{obj}{page}" width={w!r} height={h!r} type="application/pdf">'
return dict(text=escape(html))

class WEBP(ImageBase):
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"""
The `WEBP` pane embeds a .webp image file in a panel if
provided a local path, or will link to a remote image if provided
a URL.

Reference: https://developers.google.com/speed/webp/docs/riff_container

:Example:

>>> WEBP(
... 'https://www.gstatic.com/webp/gallery/4.sm.webp',
... alt_text='A nice tree',
... link_url='https://en.wikipedia.org/wiki/WebP',
... width=500,
... caption='A nice tree'
... )
"""

filetype: ClassVar[str] = 'webp'

_extensions: ClassVar[Tuple[str, ...]] = ('webp',)

@classmethod
def _imgshape(cls, data):
import struct
b = BytesIO(data)
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Maybe we can use a context manager here:

with BytesIO(data) as b:
    ...

b.read(12) # Skip RIFF header
if b.read(4) != b'VP8 ': # Check if VP8 chunk is present
raise ValueError("Invalid WebP file")
b.read(3) # Skip VP8 header
w, h = struct.unpack("<HH", b.read(4)) # Width and height are little-endian
return int(w), int(h)
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