/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H
#define SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H
#include <stdint.h>
#ifndef ANDROID
#include <stddef.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*
* If the HAL needs to create service threads to handle graphics related
* tasks, these threads need to run at HAL_PRIORITY_URGENT_DISPLAY priority
* if they can block the main rendering thread in any way.
*
* the priority of the current thread can be set with:
*
* #include <sys/resource.h>
* setpriority(PRIO_PROCESS, 0, HAL_PRIORITY_URGENT_DISPLAY);
*
*/
#define HAL_PRIORITY_URGENT_DISPLAY (-8)
/**
* pixel format definitions
*/
enum {
/*
* "linear" color pixel formats:
*
* The pixel formats below contain sRGB data but are otherwise treated
* as linear formats, i.e.: no special operation is performed when
* reading or writing into a buffer in one of these formats
*/
HAL_PIXEL_FORMAT_RGBA_8888 = 1,
HAL_PIXEL_FORMAT_RGBX_8888 = 2,
HAL_PIXEL_FORMAT_RGB_888 = 3,
HAL_PIXEL_FORMAT_RGB_565 = 4,
HAL_PIXEL_FORMAT_BGRA_8888 = 5,
/*
* sRGB color pixel formats:
*
* The red, green and blue components are stored in sRGB space, and converted
* to linear space when read, using the standard sRGB to linear equation:
*
* Clinear = Csrgb / 12.92 for Csrgb <= 0.04045
* = (Csrgb + 0.055 / 1.055)^2.4 for Csrgb > 0.04045
*
* When written the inverse transformation is performed:
*
* Csrgb = 12.92 * Clinear for Clinear <= 0.0031308
* = 1.055 * Clinear^(1/2.4) - 0.055 for Clinear > 0.0031308
*
*
* The alpha component, if present, is always stored in linear space and
* is left unmodified when read or written.
*
*/
HAL_PIXEL_FORMAT_sRGB_A_8888 = 0xC,
HAL_PIXEL_FORMAT_sRGB_X_8888 = 0xD,
/*
* 0x100 - 0x1FF
*
* This range is reserved for pixel formats that are specific to the HAL
* implementation. Implementations can use any value in this range to
* communicate video pixel formats between their HAL modules. These formats
* must not have an alpha channel. Additionally, an EGLimage created from a
* gralloc buffer of one of these formats must be supported for use with the
* GL_OES_EGL_image_external OpenGL ES extension.
*/
/*
* Android YUV format:
*
* This format is exposed outside of the HAL to software decoders and
* applications. EGLImageKHR must support it in conjunction with the
* OES_EGL_image_external extension.
*
* YV12 is a 4:2:0 YCrCb planar format comprised of a WxH Y plane followed
* by (W/2) x (H/2) Cr and Cb planes.
*
* This format assumes
* - an even width
* - an even height
* - a horizontal stride multiple of 16 pixels
* - a vertical stride equal to the height
*
* y_size = stride * height
* c_stride = ALIGN(stride/2, 16)
* c_size = c_stride * height/2
* size = y_size + c_size * 2
* cr_offset = y_size
* cb_offset = y_size + c_size
*
*/
HAL_PIXEL_FORMAT_YV12 = 0x32315659, // YCrCb 4:2:0 Planar
/*
* Android Y8 format:
*
* This format is exposed outside of the HAL to the framework.
* The expected gralloc usage flags are SW_* and HW_CAMERA_*,
* and no other HW_ flags will be used.
*
* Y8 is a YUV planar format comprised of a WxH Y plane,
* with each pixel being represented by 8 bits.
*
* It is equivalent to just the Y plane from YV12.
*
* This format assumes
* - an even width
* - an even height
* - a horizontal stride multiple of 16 pixels
* - a vertical stride equal to the height
*
* size = stride * height
*
*/
HAL_PIXEL_FORMAT_Y8 = 0x20203859,
/*
* Android Y16 format:
*
* This format is exposed outside of the HAL to the framework.
* The expected gralloc usage flags are SW_* and HW_CAMERA_*,
* and no other HW_ flags will be used.
*
* Y16 is a YUV planar format comprised of a WxH Y plane,
* with each pixel being represented by 16 bits.
*
* It is just like Y8, but has double the bits per pixel (little endian).
*
* This format assumes
* - an even width
* - an even height
* - a horizontal stride multiple of 16 pixels
* - a vertical stride equal to the height
* - strides are specified in pixels, not in bytes
*
* size = stride * height * 2
*
*/
HAL_PIXEL_FORMAT_Y16 = 0x20363159,
/*
* Android RAW sensor format:
*
* This format is exposed outside of the HAL to applications.
*
* RAW_SENSOR is a single-channel 16-bit format, typically representing raw
* Bayer-pattern images from an image sensor, with minimal processing.
*
* The exact pixel layout of the data in the buffer is sensor-dependent, and
* needs to be queried from the camera device.
*
* Generally, not all 16 bits are used; more common values are 10 or 12
* bits. All parameters to interpret the raw data (black and white points,
* color space, etc) must be queried from the camera device.
*
* This format assumes
* - an even width
* - an even height
* - a horizontal stride multiple of 16 pixels (32 bytes).
*/
HAL_PIXEL_FORMAT_RAW_SENSOR = 0x20,
/*
* Android binary blob graphics buffer format:
*
* This format is used to carry task-specific data which does not have a
* standard image structure. The details of the format are left to the two
* endpoints.
*
* A typical use case is for transporting JPEG-compressed images from the
* Camera HAL to the framework or to applications.
*
* Buffers of this format must have a height of 1, and width equal to their
* size in bytes.
*/
HAL_PIXEL_FORMAT_BLOB = 0x21,
/*
* Android format indicating that the choice of format is entirely up to the
* device-specific Gralloc implementation.
*
* The Gralloc implementation should examine the usage bits passed in when
* allocating a buffer with this format, and it should derive the pixel
* format from those usage flags. This format will never be used with any
* of the GRALLOC_USAGE_SW_* usage flags.
*
* If a buffer of this format is to be used as an OpenGL ES texture, the
* framework will assume that sampling the texture will always return an
* alpha value of 1.0 (i.e. the buffer contains only opaque pixel values).
*
*/
HAL_PIXEL_FORMAT_IMPLEMENTATION_DEFINED = 0x22,
/*
* Android flexible YCbCr formats
*
* This format allows platforms to use an efficient YCbCr/YCrCb buffer
* layout, while still describing the buffer layout in a way accessible to
* the CPU in a device-independent manner. While called YCbCr, it can be
* used to describe formats with either chromatic ordering, as well as
* whole planar or semiplanar layouts.
*
* struct android_ycbcr (below) is the the struct used to describe it.
*
* This format must be accepted by the gralloc module when
* USAGE_HW_CAMERA_WRITE and USAGE_SW_READ_* are set.
*
* This format is locked for use by gralloc's (*lock_ycbcr) method, and
* locking with the (*lock) method will return an error.
*/
HAL_PIXEL_FORMAT_YCbCr_420_888 = 0x23,
/* Legacy formats (deprecated), used by ImageFormat.java */
HAL_PIXEL_FORMAT_YCbCr_422_SP = 0x10, // NV16
HAL_PIXEL_FORMAT_YCrCb_420_SP = 0x11, // NV21
HAL_PIXEL_FORMAT_YCbCr_422_I = 0x14, // YUY2
};
/*
* Structure for describing YCbCr formats for consumption by applications.
* This is used with HAL_PIXEL_FORMAT_YCbCr_*_888.
*
* Buffer chroma subsampling is defined in the format.
* e.g. HAL_PIXEL_FORMAT_YCbCr_420_888 has subsampling 4:2:0.
*
* Buffers must have a 8 bit depth.
*
* @y, @cb, and @cr point to the first byte of their respective planes.
*
* Stride describes the distance in bytes from the first value of one row of
* the image to the first value of the next row. It includes the width of the
* image plus padding.
* @ystride is the stride of the luma plane.
* @cstride is the stride of the chroma planes.
*
* @chroma_step is the distance in bytes from one chroma pixel value to the
* next. This is 2 bytes for semiplanar (because chroma values are interleaved
* and each chroma value is one byte) and 1 for planar.
*/
struct android_ycbcr {
void *y;
void *cb;
void *cr;
size_t ystride;
size_t cstride;
size_t chroma_step;
/** reserved for future use, set to 0 by gralloc's (*lock_ycbcr)() */
uint32_t reserved[8];
};
/**
* Transformation definitions
*
* IMPORTANT NOTE:
* HAL_TRANSFORM_ROT_90 is applied CLOCKWISE and AFTER HAL_TRANSFORM_FLIP_{H|V}.
*
*/
enum {
/* flip source image horizontally (around the vertical axis) */
HAL_TRANSFORM_FLIP_H = 0x01,
/* flip source image vertically (around the horizontal axis)*/
HAL_TRANSFORM_FLIP_V = 0x02,
/* rotate source image 90 degrees clockwise */
HAL_TRANSFORM_ROT_90 = 0x04,
/* rotate source image 180 degrees */
HAL_TRANSFORM_ROT_180 = 0x03,
/* rotate source image 270 degrees clockwise */
HAL_TRANSFORM_ROT_270 = 0x07,
/* don't use. see system/window.h */
HAL_TRANSFORM_RESERVED = 0x08,
};
#ifdef __cplusplus
}
#endif
#endif /* SYSTEM_CORE_INCLUDE_ANDROID_GRAPHICS_H */