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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this file,
+ * You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * The origin of this IDL file is
+ * https://html.spec.whatwg.org/multipage/webappapis.html#images
+ *
+ * The origin of the extended IDL file is
+ * http://w3c.github.io/mediacapture-worker/#imagebitmap-extensions
+ */
+
+typedef (CanvasImageSource or
+ Blob or
+ CanvasRenderingContext2D or // This is out of spec.
+ ImageData) ImageBitmapSource;
+
+[Exposed=(Window,Worker)]
+interface ImageBitmap {
+ [Constant]
+ readonly attribute unsigned long width;
+ [Constant]
+ readonly attribute unsigned long height;
+};
+
+// It's crucial that there be a way to explicitly dispose of ImageBitmaps
+// since they refer to potentially large graphics resources. Some uses
+// of this API proposal will result in repeated allocations of ImageBitmaps,
+// and garbage collection will not reliably reclaim them quickly enough.
+// Here we reuse close(), which also exists on another Transferable type,
+// MessagePort. Potentially, all Transferable types should inherit from a
+// new interface type "Closeable".
+partial interface ImageBitmap {
+ // Dispose of all graphical resources associated with this ImageBitmap.
+ void close();
+};
+
+// ImageBitmap-extensions
+// Bug 1141979 - [FoxEye] Extend ImageBitmap with interfaces to access its
+// underlying image data
+
+/*
+ * An image or a video frame is conceptually a two-dimensional array of data and
+ * each element in the array is called a pixel. The pixels are usually stored in
+ * a one-dimensional array and could be arranged in a variety of image formats.
+ * Developers need to know how the pixels are formatted so that they are able to
+ * process them.
+ *
+ * The image format describes how pixels in an image are arranged. A single
+ * pixel has at least one, but usually multiple pixel values. The range of a
+ * pixel value varies, which means different image formats use different data
+ * types to store a single pixel value.
+ *
+ * The most frequently used data type is 8-bit unsigned integer whose range is
+ * from 0 to 255, others could be 16-bit integer or 32-bit floating points and
+ * so forth. The number of pixel values of a single pixel is called the number
+ * of channels of the image format. Multiple pixel values of a pixel are used
+ * together to describe the captured property which could be color or depth
+ * information. For example, if the data is a color image in RGB color space,
+ * then it is a three-channel image format and a pixel is described by R, G and
+ * B three pixel values with range from 0 to 255. As another example, if the
+ * data is a gray image, then it is a single-channel image format with 8-bit
+ * unsigned integer data type and the pixel value describes the gray scale. For
+ * depth data, it is a single channel image format too, but the data type is
+ * 16-bit unsigned integer and the pixel value is the depth level.
+ *
+ * For those image formats whose pixels contain multiple pixel values, the pixel
+ * values might be arranged in one of the following ways:
+ * 1) Planar pixel layout:
+ * each channel has its pixel values stored consecutively in separated
+ * buffers (a.k.a. planes) and then all channel buffers are stored
+ * consecutively in memory.
+ * (Ex: RRRRRR......GGGGGG......BBBBBB......)
+ * 2) Interleaving pixel layout:
+ * each pixel has its pixel values from all channels stored together and
+ * interleaves all channels.
+ * (Ex: RGBRGBRGBRGBRGB......)
+ */
+
+
+/*
+ * The ImageBitmap extensions use this enumeration to negotiate the image format
+ * while 1) accessing the underlying data of an ImageBitmap and
+ * 2) creating a new ImageBitmap.
+ *
+ * For each format in this enumeration, we use a 2x2 small image (4 pixels) as
+ * example to illustrate the pixel layout.
+ *
+ * 2x2 image: +--------+--------+
+ * | pixel1 | pixel2 |
+ * +--------+--------+
+ * | pixel3 | pixel4 |
+ * +--------+--------+
+ *
+ */
+enum ImageBitmapFormat {
+ /*
+ * Channel order: R, G, B, A
+ * Channel size: full rgba-chennels
+ * Pixel layout: interleaving rgba-channels
+ * Pixel layout illustration:
+ * [Plane1]: R1 G1 B1 A1 R2 G2 B2 A2 R3 G3 B3 A3 R4 G4 B4 A4
+ * Data type: 8-bit unsigned integer
+ */
+ "RGBA32",
+
+ /*
+ * Channel order: B, G, R, A
+ * Channel size: full bgra-channels
+ * Pixel layout: interleaving bgra-channels
+ * Pixel layout illustration:
+ * [Plane1]: B1 G1 R1 A1 B2 G2 R2 A2 B3 G3 R3 A3 B4 G4 R4 A4
+ * Data type: 8-bit unsigned integer
+ */
+ "BGRA32",
+
+ /*
+ * Channel order: R, G, B
+ * Channel size: full rgb-channels
+ * Pixel layout: interleaving rgb-channels
+ * Pixel layout illustration:
+ * [Plane1]: R1 G1 B1 R2 G2 B2 R3 G3 B3 R4 G4 B4
+ * Data type: 8-bit unsigned integer
+ */
+ "RGB24",
+
+ /*
+ * Channel order: B, G, R
+ * Channel size: full bgr-channels
+ * Pixel layout: interleaving bgr-channels
+ * Pixel layout illustration:
+ * [Plane1]: B1 G1 R1 B2 G2 R2 B3 G3 R3 B4 G4 R4
+ * Data type: 8-bit unsigned integer
+ */
+ "BGR24",
+
+ /*
+ * Channel order: GRAY
+ * Channel size: full gray-channel
+ * Pixel layout: planar gray-channel
+ * Pixel layout illustration:
+ * [Plane1]: GRAY1 GRAY2 GRAY3 GRAY4
+ * Data type: 8-bit unsigned integer
+ */
+ "GRAY8",
+
+ /*
+ * Channel order: Y, U, V
+ * Channel size: full yuv-channels
+ * Pixel layout: planar yuv-channels
+ * Pixel layout illustration:
+ * [Plane1]: Y1 Y2 Y3 Y4
+ * [Plane2]: U1 U2 U3 U4
+ * [Plane3]: V1 V2 V3 V4
+ * Data type: 8-bit unsigned integer
+ */
+ "YUV444P",
+
+ /*
+ * Channel order: Y, U, V
+ * Channel size: full y-channel, half uv-channels
+ * Pixel layout: planar yuv-channels
+ * Pixel layout illustration:
+ * [Plane1]: Y1 Y2 Y3 Y4
+ * [Plane2]: U1 U3
+ * [Plane3]: V1 V3
+ * Data type: 8-bit unsigned integer
+ */
+ "YUV422P",
+
+ /*
+ * Channel order: Y, U, V
+ * Channel size: full y-channel, quarter uv-channels
+ * Pixel layout: planar yuv-channels
+ * Pixel layout illustration:
+ * [Plane1]: Y1 Y2 Y3 Y4
+ * [Plane2]: U1
+ * [Plane3]: V1
+ * Data type: 8-bit unsigned integer
+ */
+ "YUV420P",
+
+ /*
+ * Channel order: Y, U, V
+ * Channel size: full y-channel, quarter uv-channels
+ * Pixel layout: planar y-channel, interleaving uv-channels
+ * Pixel layout illustration:
+ * [Plane1]: Y1 Y2 Y3 Y4
+ * [Plane2]: U1 V1
+ * Data type: 8-bit unsigned integer
+ */
+ "YUV420SP_NV12",
+
+ /*
+ * Channel order: Y, V, U
+ * Channel size: full y-channel, quarter vu-channels
+ * Pixel layout: planar y-channel, interleaving vu-channels
+ * Pixel layout illustration:
+ * [Plane1]: Y1 Y2 Y3 Y4
+ * [Plane2]: V1 U1
+ * Data type: 8-bit unsigned integer
+ */
+ "YUV420SP_NV21",
+
+ /*
+ * Channel order: H, S, V
+ * Channel size: full hsv-channels
+ * Pixel layout: interleaving hsv-channels
+ * Pixel layout illustration:
+ * [Plane1]: H1 S1 V1 H2 S2 V2 H3 S3 V3
+ * Data type: 32-bit floating point value
+ */
+ "HSV",
+
+ /*
+ * Channel order: l, a, b
+ * Channel size: full lab-channels
+ * Pixel layout: interleaving lab-channels
+ * Pixel layout illustration:
+ * [Plane1]: l1 a1 b1 l2 a2 b2 l3 a3 b3
+ * Data type: 32-bit floating point value
+ */
+ "Lab",
+
+ /*
+ * Channel order: DEPTH
+ * Channel size: full depth-channel
+ * Pixel layout: planar depth-channel
+ * Pixel layout illustration:
+ * [Plane1]: DEPTH1 DEPTH2 DEPTH3 DEPTH4
+ * Data type: 16-bit unsigned integer
+ */
+ "DEPTH",
+};
+
+enum ChannelPixelLayoutDataType {
+ "uint8",
+ "int8",
+ "uint16",
+ "int16",
+ "uint32",
+ "int32",
+ "float32",
+ "float64"
+};
+
+/*
+ * Two concepts, ImagePixelLayout and ChannelPixelLayout, together generalize
+ * the variety of pixel layouts among image formats.
+ *
+ * The ChannelPixelLayout represents the pixel layout of a single channel in a
+ * certain image format and the ImagePixelLayout is just the collection of
+ * ChannelPixelLayouts. So, the ChannelPixelLayout is defined as a dictionary
+ * type with properties to describe the layout and the ImagePixelLayout is just
+ * an alias name to a sequence of ChannelPixelLayout objects.
+ *
+ * Since an image format is composed of at least one channel, an
+ * ImagePixelLayout object contains at least one ChannelPixelLayout object.
+ *
+ * Although an image or a video frame is a two-dimensional structure, its data
+ * is usually stored in a one-dimensional array in the row-major way and the
+ * ChannelPixelLayout objects use the following properties to describe the
+ * layout of pixel values in the buffer.
+ *
+ * 1) offset:
+ * denotes the beginning position of the channel's data relative to the
+ * beginning position of the one-dimensional array.
+ * 2) width & height:
+ * denote the width and height of the channel respectively. Each channel in
+ * an image format may have different height and width.
+ * 3) data type:
+ * denotes the format used to store one single pixel value.
+ * 4) stride:
+ * the number of bytes between the beginning two consecutive rows in memory.
+ * (The total bytes of each row plus the padding bytes of each raw.)
+ * 5) skip value:
+ * the value is zero for the planar pixel layout, and a positive integer for
+ * the interleaving pixel layout. (Describes how many bytes there are between
+ * two adjacent pixel values in this channel.)
+ */
+
+/*
+ * Example1: RGBA image, width = 620, height = 480, stride = 2560
+ *
+ * chanel_r: offset = 0, width = 620, height = 480, data type = uint8, stride = 2560, skip = 3
+ * chanel_g: offset = 1, width = 620, height = 480, data type = uint8, stride = 2560, skip = 3
+ * chanel_b: offset = 2, width = 620, height = 480, data type = uint8, stride = 2560, skip = 3
+ * chanel_a: offset = 3, width = 620, height = 480, data type = uint8, stride = 2560, skip = 3
+ *
+ * <---------------------------- stride ---------------------------->
+ * <---------------------- width x 4 ---------------------->
+ * [index] 01234 8 12 16 20 24 28 2479 2559
+ * |||||---|---|---|---|---|---|----------------------------|-------|
+ * [data] RGBARGBARGBARGBARGBAR___R___R... A%%%%%%%%
+ * [data] RGBARGBARGBARGBARGBAR___R___R... A%%%%%%%%
+ * [data] RGBARGBARGBARGBARGBAR___R___R... A%%%%%%%%
+ * ^^^
+ * r-skip
+ */
+
+/*
+ * Example2: YUV420P image, width = 620, height = 480, stride = 640
+ *
+ * chanel_y: offset = 0, width = 620, height = 480, stride = 640, skip = 0
+ * chanel_u: offset = 307200, width = 310, height = 240, data type = uint8, stride = 320, skip = 0
+ * chanel_v: offset = 384000, width = 310, height = 240, data type = uint8, stride = 320, skip = 0
+ *
+ * <--------------------------- y-stride --------------------------->
+ * <----------------------- y-width ----------------------->
+ * [index] 012345 619 639
+ * ||||||--------------------------------------------------|--------|
+ * [data] YYYYYYYYYYYYYYYYYYYYYYYYYYYYY... Y%%%%%%%%%
+ * [data] YYYYYYYYYYYYYYYYYYYYYYYYYYYYY... Y%%%%%%%%%
+ * [data] YYYYYYYYYYYYYYYYYYYYYYYYYYYYY... Y%%%%%%%%%
+ * [data] ......
+ * <-------- u-stride ---------->
+ * <----- u-width ----->
+ * [index] 307200 307509 307519
+ * |-------------------|--------|
+ * [data] UUUUUUUUUU... U%%%%%%%%%
+ * [data] UUUUUUUUUU... U%%%%%%%%%
+ * [data] UUUUUUUUUU... U%%%%%%%%%
+ * [data] ......
+ * <-------- v-stride ---------->
+ * <- --- v-width ----->
+ * [index] 384000 384309 384319
+ * |-------------------|--------|
+ * [data] VVVVVVVVVV... V%%%%%%%%%
+ * [data] VVVVVVVVVV... V%%%%%%%%%
+ * [data] VVVVVVVVVV... V%%%%%%%%%
+ * [data] ......
+ */
+
+/*
+ * Example3: YUV420SP_NV12 image, width = 620, height = 480, stride = 640
+ *
+ * chanel_y: offset = 0, width = 620, height = 480, stride = 640, skip = 0
+ * chanel_u: offset = 307200, width = 310, height = 240, data type = uint8, stride = 640, skip = 1
+ * chanel_v: offset = 307201, width = 310, height = 240, data type = uint8, stride = 640, skip = 1
+ *
+ * <--------------------------- y-stride -------------------------->
+ * <----------------------- y-width ---------------------->
+ * [index] 012345 619 639
+ * ||||||-------------------------------------------------|--------|
+ * [data] YYYYYYYYYYYYYYYYYYYYYYYYYYYYY... Y%%%%%%%%%
+ * [data] YYYYYYYYYYYYYYYYYYYYYYYYYYYYY... Y%%%%%%%%%
+ * [data] YYYYYYYYYYYYYYYYYYYYYYYYYYYYY... Y%%%%%%%%%
+ * [data] ......
+ * <--------------------- u-stride / v-stride -------------------->
+ * <------------------ u-width + v-width ----------------->
+ * [index] 307200(u-offset) 307819 307839
+ * |------------------------------------------------------|-------|
+ * [index] |307201(v-offset) |307820 |
+ * ||-----------------------------------------------------||------|
+ * [data] UVUVUVUVUVUVUVUVUVUVUVUVUVUVUV... UV%%%%%%%
+ * [data] UVUVUVUVUVUVUVUVUVUVUVUVUVUVUV... UV%%%%%%%
+ * [data] UVUVUVUVUVUVUVUVUVUVUVUVUVUVUV... UV%%%%%%%
+ * ^ ^
+ * u-skip v-skip
+ */
+
+/*
+ * Example4: DEPTH image, width = 640, height = 480, stride = 1280
+ *
+ * chanel_d: offset = 0, width = 640, height = 480, data type = uint16, stride = 1280, skip = 0
+ *
+ * note: each DEPTH value uses two bytes
+ *
+ * <----------------------- d-stride ---------------------->
+ * <----------------------- d-width ----------------------->
+ * [index] 02468 1278
+ * |||||---------------------------------------------------|
+ * [data] DDDDDDDDDDDDDDDDDDDDDDDDDDDDD... D
+ * [data] DDDDDDDDDDDDDDDDDDDDDDDDDDDDD... D
+ * [data] DDDDDDDDDDDDDDDDDDDDDDDDDDDDD... D
+ * [data] ......
+ */
+
+dictionary ChannelPixelLayout {
+ required unsigned long offset;
+ required unsigned long width;
+ required unsigned long height;
+ required ChannelPixelLayoutDataType dataType;
+ required unsigned long stride;
+ required unsigned long skip;
+};
+
+typedef sequence<ChannelPixelLayout> ImagePixelLayout;
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-03 10:27:20 +0000