dany/libwebp
1
0
Fork 0
mirror of https://github.com/webmproject/libwebp.git synced 2025-07-12 22:14:29 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity

check limit of width * height is 32 bits

Browse Source 
Update the RIFF-specs file too

Change-Id: I113a7e25da2f7a19c1344c1dc5d496127cfe2596
This commit is contained in:
Pascal Massimino
2012-07-03 05:42:13 -07:00
parent 16c46e83ac
commit 7f22bd2596
5 changed files with 56 additions and 38 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
doc/webp-container-spec.txt
View File

@ -329,9 +329,9 @@ Extended WebP file header:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| R |L|M|I|A|T| Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Canvas Width | ...
| Canvas Width Minus One | ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
... Canvas Height |
... Canvas Height Minus One |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Tiling (T): 1 bit
@ -387,15 +387,17 @@ Reserved: 24 bits
: SHOULD be `0`.
Canvas Width: 24 bits
Canvas Width Minus One: 24 bits
: _1-based_ width of the canvas in pixels.
The actual canvas width is '1 + Canvas Width Minus One'
Canvas Height: 24 bits
Canvas Height Minus One: 24 bits
: _1-based_ height of the canvas in pixels.
The actual canvas height is '1 + Canvas Height Minus One'
The product of _Canvas Width_ and _Canvas Height_ SHOULD be at most `2^32 - 1`.
The product of _Canvas Width_ and _Canvas Height_ MUST be at most `2^32 - 1`.
Future specifications MAY add more fields.
@ -433,11 +435,11 @@ Frame chunk:
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Frame X | ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
... Frame Y | Frame Width ...
... Frame Y | Frame Width Minus One ...
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
... | Frame Height |
... | Frame Height Minus One |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Frame Duration |
| Frame Duration Minus One |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Frame X: 24 bits (_uint24_)
@ -448,18 +450,20 @@ Frame Y: 24 bits (_uint24_)
: The Y coordinate of the upper left corner of the frame is `Frame Y * 2`
Frame Width: 24 bits (_uint24_)
Frame Width Minus One: 24 bits (_uint24_)
: The _1-based_ width of the frame.
The Frame Width is '1 + Frame Width Minus One'
Frame Height: 24 bits (_uint24_)
Frame Height Minus One: 24 bits (_uint24_)
: The _1-based_ height of the frame.
The Frame Height is '1 + Frame Height Minus One'
Frame Duration: 24 bits (_uint24_)
Frame Duration Minus One: 24 bits (_uint24_)
: Time to wait before displaying the next frame, in 1 millisecond units
(_1-based_).
: _1-based_ time to wait before displaying the next frame, in 1 millisecond
units. The actual duration is '1 + Frame Duration Minus One' milliseconds.
For images that are animations, this chunk contains information about a single
frame, and describes the (optional) alpha chunk and the bitstream chunk that