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Mozilla2:Image Encoding: Difference between revisions
→Interface
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Something like: | Something like: | ||
interface imgIEncoder : | interface imgIEncoder : nsIInputStream | ||
{ | { | ||
/* input image data | /* input image data | ||
* result width | * result width | ||
* result height | * result height | ||
*/ | */ | ||
void | void init(in imgIContainer input, | ||
in unsigned long width, in unsigned long height); | |||
}; | }; | ||
=== Scaling === | === Scaling === | ||
Do we want to support different types of scaling? I' | Do we want to support different types of scaling? I'd prefer to just do nice Bicubic resampling. [http://members.bellatlantic.net/~vze2vrva/design.html] [http://astronomy.swin.edu.au/~pbourke/colour/bicubic/] | ||
== Brendan's comments == | === Brendan's comments === | ||
A reader should get the bytes requested, if not greater than length of encoded image, and it's up to the encoder to buffer more if it encodes more bytes, reading from the buffer on next read. | A reader should get the bytes requested, if not greater than length of encoded image, and it's up to the encoder to buffer more if it encodes more bytes, reading from the buffer on next read. | ||
This expresses the idea that the encoder is something you read from. | |||
== Use == | == Use == | ||
You would create one by doing: | You would create one by doing: | ||
createInstance("@mozilla.org/image/encoder;2?type=image/png"); | createInstance("@mozilla.org/image/encoder;2?type=image/png"); | ||