mirror of
https://github.com/classilla/tenfourfox.git
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136 lines
5.3 KiB
Plaintext
136 lines
5.3 KiB
Plaintext
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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#include "nsIAsyncInputStream.idl"
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#include "nsIEventTarget.idl"
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/**
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* imgIEncoder interface
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*/
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[scriptable, uuid(4baa2d6e-fee7-42df-ae3f-5fbebc0c267c)]
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interface imgIEncoder : nsIAsyncInputStream
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{
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// Possible values for outputOptions. Multiple values are semicolon-separated.
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//
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// PNG:
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// ----
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// transparency=[yes|no|none] -- default: "yes"
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// Overrides default from input format. "no" and "none" are equivalent.
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//
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//
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// APNG:
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// -----
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// The following options can be used with startImageEncode():
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//
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// transparency=[yes|no|none] -- default: "yes"
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// Overrides default from input format. "no" and "none" are equivalent.
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// skipfirstframe=[yes|no] -- default: "no"
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// Controls display of the first frame in animations. PNG-only clients
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// always display the first frame (and only that frame).
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// frames=# -- default: "1"
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// Total number of frames in the image. The first frame, even if skipped,
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// is always included in the count.
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// plays=# -- default: "0"
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// Number of times to play the animation sequence. "0" will repeat
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// forever.
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//
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// The following options can be used for each frame, with addImageFrame():
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//
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// transparency=[yes|no|none] -- default: "yes"
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// Overrides default from input format. "no" and "none" are equivalent.
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// delay=# -- default: "500"
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// Number of milliseconds to display the frame, before moving to the next
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// frame.
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// dispose=[none|background|previous] -- default: "none"
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// What to do with the image's canvas before rendering the next frame.
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// See APNG spec.
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// blend=[source|over] -- default: "source"
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// How to render the new frame on the canvas. See APNG spec.
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// xoffset=# -- default: "0"
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// yoffset=# -- default: "0"
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// Where to draw the frame, relative to the canvas.
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//
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//
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// JPEG:
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// -----
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//
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// quality=# -- default: "92"
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// Quality of compression, 0-100 (worst-best).
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// Quality >= 90 prevents down-sampling of the color channels.
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// Possible values for input format (note that not all image formats
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// support saving alpha channels):
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// Input is RGB each pixel is represented by three bytes:
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// R, G, and B (in that order, regardless of host endianness)
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const uint32_t INPUT_FORMAT_RGB = 0;
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// Input is RGB each pixel is represented by four bytes:
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// R, G, and B (in that order, regardless of host endianness).
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// POST-MULTIPLIED alpha us used (50% transparent red is 0xff000080)
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const uint32_t INPUT_FORMAT_RGBA = 1;
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// Input is host-endian ARGB: On big-endian machines each pixel is therefore
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// ARGB, and for little-endian machiens (Intel) each pixel is BGRA
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// (This is used by canvas to match it's internal representation)
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//
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// PRE-MULTIPLIED alpha is used (That is, 50% transparent red is 0x80800000,
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// not 0x80ff0000
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const uint32_t INPUT_FORMAT_HOSTARGB = 2;
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/* data - list of bytes in the format specified by inputFormat
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* width - width in pixels
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* height - height in pixels
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* stride - number of bytes per row in the image
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* Normally (width*3) or (width*4), depending on your input format,
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* but some data uses padding at the end of each row, which would
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* be extra.
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* inputFormat - one of INPUT_FORMAT_* specifying the format of data
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* outputOptions - semicolon-delimited list of name=value pairs that can
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* give options to the output encoder. Options are encoder-
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* specific. Just give empty string for default behavior.
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*/
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void initFromData([array, size_is(length), const] in uint8_t data,
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in unsigned long length,
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in uint32_t width,
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in uint32_t height,
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in uint32_t stride,
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in uint32_t inputFormat,
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in AString outputOptions);
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/*
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* For encoding images which may contain multiple frames, the 1-shot
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* initFromData() interface is too simplistic. The alternative is to
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* use startImageEncode(), call addImageFrame() one or more times, and
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* then finish initialization with endImageEncode().
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*
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* The arguments are basically the same as in initFromData().
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*/
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void startImageEncode(in uint32_t width,
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in uint32_t height,
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in uint32_t inputFormat,
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in AString outputOptions);
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void addImageFrame( [array, size_is(length), const] in uint8_t data,
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in unsigned long length,
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in uint32_t width,
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in uint32_t height,
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in uint32_t stride,
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in uint32_t frameFormat,
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in AString frameOptions);
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void endImageEncode();
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/*
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* Sometimes an encoder can contain another encoder and direct access
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* to its buffer is necessary. It is only safe to assume that the buffer
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* returned from getImageBuffer() is of size equal to getImageBufferUsed().
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*/
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[noscript] unsigned long getImageBufferUsed();
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[noscript] charPtr getImageBuffer();
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};
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