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//! Bindings for [`AndroidBitmap`] functions
//!
//! These functions operate directly on a JNI [`android.graphics.Bitmap`] instance.
//!
//! [`AndroidBitmap`]: https://developer.android.com/ndk/reference/group/bitmap
//! [`android.graphics.Bitmap`]: https://developer.android.com/reference/android/graphics/Bitmap
#![cfg(feature = "bitmap")]
use jni_sys::{jobject, JNIEnv};
use num_enum::{FromPrimitive, IntoPrimitive};
use std::{error, fmt, mem::MaybeUninit};
#[cfg(feature = "api-level-30")]
use crate::data_space::DataSpace;
#[cfg(feature = "api-level-30")]
use crate::hardware_buffer::HardwareBufferRef;
#[repr(i32)]
#[derive(Copy, Clone, Debug, PartialEq, Eq, FromPrimitive, IntoPrimitive)]
#[non_exhaustive]
pub enum BitmapError {
#[doc(alias = "ANDROID_BITMAP_RESULT_ALLOCATION_FAILED")]
AllocationFailed = ffi::ANDROID_BITMAP_RESULT_ALLOCATION_FAILED,
#[doc(alias = "ANDROID_BITMAP_RESULT_BAD_PARAMETER")]
BadParameter = ffi::ANDROID_BITMAP_RESULT_BAD_PARAMETER,
#[doc(alias = "ANDROID_BITMAP_RESULT_JNI_EXCEPTION")]
JniException = ffi::ANDROID_BITMAP_RESULT_JNI_EXCEPTION,
// Use the SUCCESS discriminant, as no-one will be able to call `as i32` and only has access to
// the constants via `From` provided by `IntoPrimitive` which reads the contained value.
// An autogenerated `<previous variant> + 1` discriminant is normally fine, except that the
// previous variant is negative and `+ 1` would match the variant before that.
#[doc(hidden)]
#[num_enum(catch_all)]
__Unknown(i32) = ffi::ANDROID_BITMAP_RESULT_SUCCESS,
}
impl fmt::Display for BitmapError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{:?}", self)
}
}
impl error::Error for BitmapError {}
pub type Result<T, E = BitmapError> = std::result::Result<T, E>;
impl BitmapError {
pub(crate) fn from_status(status: i32) -> Result<()> {
match status {
ffi::ANDROID_BITMAP_RESULT_SUCCESS => Ok(()),
x => Err(Self::from(x)),
}
}
}
fn construct<T>(with_ptr: impl FnOnce(*mut T) -> i32) -> Result<T> {
let mut result = MaybeUninit::uninit();
let status = with_ptr(result.as_mut_ptr());
BitmapError::from_status(status).map(|()| unsafe { result.assume_init() })
}
#[repr(i32)]
#[derive(Clone, Copy, Debug, PartialEq, Eq, IntoPrimitive, FromPrimitive)]
#[allow(non_camel_case_types)]
#[doc(alias = "AndroidBitmapFormat")]
#[non_exhaustive]
pub enum BitmapFormat {
#[doc(alias = "ANDROID_BITMAP_FORMAT_NONE")]
NONE = ffi::AndroidBitmapFormat::ANDROID_BITMAP_FORMAT_NONE.0 as i32,
#[doc(alias = "ANDROID_BITMAP_FORMAT_RGBA_8888")]
RGBA_8888 = ffi::AndroidBitmapFormat::ANDROID_BITMAP_FORMAT_RGBA_8888.0 as i32,
#[doc(alias = "ANDROID_BITMAP_FORMAT_RGB_565")]
RGB_565 = ffi::AndroidBitmapFormat::ANDROID_BITMAP_FORMAT_RGB_565.0 as i32,
#[deprecated = "Deprecated in API level 13. Because of the poor quality of this configuration, it is advised to use ARGB_8888 instead."]
#[doc(alias = "ANDROID_BITMAP_FORMAT_RGBA_4444")]
RGBA_4444 = ffi::AndroidBitmapFormat::ANDROID_BITMAP_FORMAT_RGBA_4444.0 as i32,
#[doc(alias = "ANDROID_BITMAP_FORMAT_A_8")]
A_8 = ffi::AndroidBitmapFormat::ANDROID_BITMAP_FORMAT_A_8.0 as i32,
#[doc(alias = "ANDROID_BITMAP_FORMAT_RGBA_F16")]
RGBA_F16 = ffi::AndroidBitmapFormat::ANDROID_BITMAP_FORMAT_RGBA_F16.0 as i32,
#[doc(alias = "ANDROID_BITMAP_FORMAT_RGBA_1010102")]
RGBA_1010102 = ffi::AndroidBitmapFormat::ANDROID_BITMAP_FORMAT_RGBA_1010102.0 as i32,
#[doc(hidden)]
#[num_enum(catch_all)]
__Unknown(i32),
}
/// An immediate wrapper over [`android.graphics.Bitmap`]
///
/// [`android.graphics.Bitmap`]: https://developer.android.com/reference/android/graphics/Bitmap
#[derive(Debug)]
pub struct Bitmap {
env: *mut JNIEnv,
inner: jobject,
}
impl Bitmap {
/// Create a [`Bitmap`] wrapper from JNI pointers
///
/// # Safety
/// This function should be called with a healthy JVM pointer and with a non-null
/// [`android.graphics.Bitmap`], which must be kept alive on the Java/Kotlin side.
///
/// [`android.graphics.Bitmap`]: https://developer.android.com/reference/android/graphics/Bitmap
pub unsafe fn from_jni(env: *mut JNIEnv, bitmap: jobject) -> Self {
Self { env, inner: bitmap }
}
/// Fills out and returns the [`BitmapInfo`] struct for the given Java bitmap object.
#[doc(alias = "AndroidBitmap_getInfo")]
pub fn info(&self) -> Result<BitmapInfo> {
let inner =
construct(|res| unsafe { ffi::AndroidBitmap_getInfo(self.env, self.inner, res) })?;
Ok(BitmapInfo { inner })
}
/// Returns the [`DataSpace`] of this [`Bitmap`].
///
/// Note that [`DataSpace`] only exposes a few values. This may return [`DataSpace::Unknown`],
/// even for Named ColorSpaces, if they have no corresponding [`DataSpace`].
#[cfg(feature = "api-level-30")]
#[doc(alias = "AndroidBitmap_getDataSpace")]
pub fn data_space(&self) -> DataSpace {
let value = unsafe { ffi::AndroidBitmap_getDataSpace(self.env, self.inner) };
value.into()
}
/// Attempt to lock the pixel address.
///
/// Locking will ensure that the memory for the pixels will not move until the
/// [`Bitmap::unlock_pixels()`] call, and ensure that, if the pixels had been previously purged,
/// they will have been restored.
///
/// If this call succeeds, it must be balanced by a call to [`Bitmap::unlock_pixels()`], after
/// which time the address of the pixels should no longer be used.
#[doc(alias = "AndroidBitmap_lockPixels")]
pub fn lock_pixels(&self) -> Result<*mut std::os::raw::c_void> {
construct(|res| unsafe { ffi::AndroidBitmap_lockPixels(self.env, self.inner, res) })
}
/// Call this to balance a successful call to [`Bitmap::lock_pixels()`].
#[doc(alias = "AndroidBitmap_unlockPixels")]
pub fn unlock_pixels(&self) -> Result<()> {
let status = unsafe { ffi::AndroidBitmap_unlockPixels(self.env, self.inner) };
BitmapError::from_status(status)
}
/// Retrieve the native object associated with an [`ffi::ANDROID_BITMAP_FLAGS_IS_HARDWARE`]
/// [`Bitmap`] (requires [`BitmapInfoFlags::is_hardware()`] on [`BitmapInfo::flags()`] to return
/// [`true`]).
///
/// Client must not modify it while a [`Bitmap`] is wrapping it.
#[cfg(feature = "api-level-30")]
#[doc(alias = "AndroidBitmap_getHardwareBuffer")]
pub fn hardware_buffer(&self) -> Result<HardwareBufferRef> {
unsafe {
let result =
construct(|res| ffi::AndroidBitmap_getHardwareBuffer(self.env, self.inner, res))?;
let non_null = if cfg!(debug_assertions) {
std::ptr::NonNull::new(result).expect("result should never be null")
} else {
std::ptr::NonNull::new_unchecked(result)
};
Ok(HardwareBufferRef::from_ptr(non_null))
}
}
/// [Lock] the pixels in `self` and compress them as described by [`info()`].
///
/// Unlike [`compress_raw()`] this requires a [`Bitmap`] object (as `self`) backed by a
/// [`jobject`].
///
/// # Parameters
/// - `format`: [`BitmapCompressFormat`] to compress to.
/// - `quality`: Hint to the compressor, `0-100`. The value is interpreted differently
/// depending on [`BitmapCompressFormat`].
/// - `compress_callback`: Closure that writes the compressed data. Will be called on the
/// current thread, each time the compressor has compressed more data that is ready to be
/// written. May be called more than once for each call to this method.
///
/// [Lock]: Self::lock_pixels()
/// [`info()`]: Self::info()
/// [`compress_raw()`]: Self::compress_raw()
#[cfg(feature = "api-level-30")]
#[doc(alias = "AndroidBitmap_compress")]
pub fn compress<F: FnMut(&[u8]) -> Result<(), ()>>(
&self,
format: BitmapCompressFormat,
quality: i32,
compress_callback: F,
) -> Result<(), BitmapCompressError> {
let info = self.info()?;
let data_space = self.data_space();
let pixels = self.lock_pixels()?;
// SAFETY: When lock_pixels() succeeds, assume it returns a valid pointer that stays
// valid until we call unlock_pixels().
let result = unsafe {
Self::compress_raw(
&info,
data_space,
pixels,
format,
quality,
compress_callback,
)
};
self.unlock_pixels()?;
result
}
/// Compress `pixels` as described by `info`.
///
/// Unlike [`compress()`] this takes a raw pointer to pixels and does not need a [`Bitmap`]
/// object backed by a [`jobject`].
///
/// # Parameters
/// - `info`: Description of the pixels to compress.
/// - `data_space`: [`DataSpace`] describing the color space of the pixels. Should _not_ be
/// [`DataSpace::Unknown`] [^1].
/// - `pixels`: Pointer to pixels to compress.
/// - `format`: [`BitmapCompressFormat`] to compress to.
/// - `quality`: Hint to the compressor, `0-100`. The value is interpreted differently
/// depending on [`BitmapCompressFormat`].
/// - `compress_callback`: Closure that writes the compressed data. Will be called on the
/// current thread, each time the compressor has compressed more data that is ready to be
/// written. May be called more than once for each call to this method.
///
/// # Safety
/// `pixels` must point to a valid buffer that matches the size, stride and format in `info`.
///
/// [`compress()`]: Self::compress()
/// [^1]: <https://cs.android.com/android/platform/superproject/main/+/main:frameworks/base/libs/hwui/apex/android_bitmap.cpp;l=275-279;drc=7ba5c2fb3d1e35eb37a9cc522b30ba51f49ea491>
#[cfg(feature = "api-level-30")]
#[doc(alias = "AndroidBitmap_compress")]
pub unsafe fn compress_raw<F: FnMut(&[u8]) -> Result<(), ()>>(
info: &BitmapInfo,
data_space: DataSpace,
pixels: *const std::ffi::c_void,
format: BitmapCompressFormat,
quality: i32,
compress_callback: F,
) -> Result<(), BitmapCompressError> {
if data_space == DataSpace::Unknown {
return Err(BitmapCompressError::DataSpaceUnknown);
}
use std::{any::Any, ffi::c_void, panic::AssertUnwindSafe};
struct CallbackState<F: FnMut(&[u8]) -> Result<(), ()>> {
callback: F,
panic: Option<Box<dyn Any + Send>>,
}
let mut cb_state = CallbackState::<F> {
callback: compress_callback,
panic: None,
};
extern "C" fn compress_cb<F: FnMut(&[u8]) -> Result<(), ()>>(
context: *mut c_void,
data: *const c_void,
size: usize,
) -> bool {
// SAFETY: This callback will only be called serially on a single thread. Both the
// panic state and the FnMut context need to be available mutably.
let cb_state = unsafe { context.cast::<CallbackState<F>>().as_mut() }.unwrap();
let data = unsafe { std::slice::from_raw_parts(data.cast(), size) };
let panic = std::panic::catch_unwind(AssertUnwindSafe(|| (cb_state.callback)(data)));
match panic {
Ok(r) => r.is_ok(),
Err(e) => {
cb_state.panic = Some(e);
false
}
}
}
let status = unsafe {
ffi::AndroidBitmap_compress(
&info.inner,
data_space.into(),
pixels,
format.into(),
quality,
<*mut _>::cast(&mut cb_state),
Some(compress_cb::<F>),
)
};
if let Some(panic) = cb_state.panic {
std::panic::resume_unwind(panic)
}
Ok(BitmapError::from_status(status)?)
}
}
/// Possible values for [`ffi::ANDROID_BITMAP_FLAGS_ALPHA_MASK`] within [`BitmapInfoFlags`]
#[repr(u32)]
#[cfg(feature = "api-level-30")]
#[derive(Clone, Copy, Debug, IntoPrimitive, FromPrimitive)]
#[doc(alias = "ANDROID_BITMAP_FLAGS_ALPHA_MASK")]
#[non_exhaustive]
pub enum BitmapInfoFlagsAlpha {
/// Pixel components are premultiplied by alpha.
#[doc(alias = "ANDROID_BITMAP_FLAGS_ALPHA_PREMUL")]
Premultiplied = ffi::ANDROID_BITMAP_FLAGS_ALPHA_PREMUL,
/// Pixels are opaque.
#[doc(alias = "ANDROID_BITMAP_FLAGS_ALPHA_OPAQUE")]
Opaque = ffi::ANDROID_BITMAP_FLAGS_ALPHA_OPAQUE,
/// Pixel components are independent of alpha.
#[doc(alias = "ANDROID_BITMAP_FLAGS_ALPHA_UNPREMUL")]
Unpremultiplied = ffi::ANDROID_BITMAP_FLAGS_ALPHA_UNPREMUL,
#[doc(hidden)]
#[num_enum(catch_all)]
__Unknown(u32),
}
/// Bitfield containing information about the bitmap.
#[cfg(feature = "api-level-30")]
#[repr(transparent)]
#[derive(Clone, Copy, Hash, PartialEq, Eq)]
pub struct BitmapInfoFlags(u32);
#[cfg(feature = "api-level-30")]
impl std::fmt::Debug for BitmapInfoFlags {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(
f,
"BitmapInfoFlags({:#x}, alpha: {:?}, is_hardware: {})",
self.0,
self.alpha(),
self.is_hardware()
)
}
}
#[cfg(feature = "api-level-30")]
impl BitmapInfoFlags {
/// Returns the alpha value contained in the [`ffi::ANDROID_BITMAP_FLAGS_ALPHA_MASK`] bit range
#[doc(alias = "ANDROID_BITMAP_FLAGS_ALPHA_MASK")]
pub fn alpha(self) -> BitmapInfoFlagsAlpha {
// Note that ffi::ANDROID_BITMAP_FLAGS_ALPHA_SHIFT is 0 and hence irrelevant.
(self.0 & ffi::ANDROID_BITMAP_FLAGS_ALPHA_MASK).into()
}
/// Returns [`true`] when [`ffi::ANDROID_BITMAP_FLAGS_IS_HARDWARE`] is set, meaning this
/// [`Bitmap`] uses "HARDWARE Config" and its [`HardwareBufferRef`] can be retrieved via
/// [`Bitmap::hardware_buffer()`].
#[doc(alias = "ANDROID_BITMAP_FLAGS_IS_HARDWARE")]
pub fn is_hardware(self) -> bool {
// This constant is defined in a separate anonymous enum which bindgen treats as i32.
(self.0 & ffi::ANDROID_BITMAP_FLAGS_IS_HARDWARE as u32) != 0
}
}
/// A native [`AndroidBitmapInfo`]
///
/// [`AndroidBitmapInfo`]: https://developer.android.com/ndk/reference/struct/android-bitmap-info#struct_android_bitmap_info
#[derive(Clone, Copy)]
#[doc(alias = "AndroidBitmapInfo")]
pub struct BitmapInfo {
inner: ffi::AndroidBitmapInfo,
}
impl std::fmt::Debug for BitmapInfo {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
let mut f = f.debug_struct("BitmapInfo");
f.field("width", &self.width())
.field("height", &self.height())
.field("stride", &self.stride())
.field("format", &self.format());
#[cfg(feature = "api-level-30")]
f.field("flags", &self.flags());
f.finish()
}
}
impl BitmapInfo {
pub fn new(width: u32, height: u32, stride: u32, format: BitmapFormat) -> Self {
Self {
inner: ffi::AndroidBitmapInfo {
width,
height,
stride,
format: format.into(),
flags: 0,
},
}
}
#[cfg(feature = "api-level-30")]
pub fn new_with_flags(
width: u32,
height: u32,
stride: u32,
format: BitmapFormat,
flags: BitmapInfoFlags,
) -> Self {
Self {
inner: ffi::AndroidBitmapInfo {
flags: flags.0,
..Self::new(width, height, stride, format).inner
},
}
}
/// The bitmap width in pixels.
pub fn width(&self) -> u32 {
self.inner.width
}
/// The bitmap height in pixels.
pub fn height(&self) -> u32 {
self.inner.height
}
/// The number of byte per row.
pub fn stride(&self) -> u32 {
self.inner.stride
}
/// Convert the internal, native [`ffi::AndroidBitmapInfo::format`] into a [`BitmapFormat`].
pub fn format(&self) -> BitmapFormat {
self.inner.format.into()
}
/// Bitfield containing information about the bitmap.
#[cfg(feature = "api-level-30")]
pub fn flags(&self) -> BitmapInfoFlags {
BitmapInfoFlags(self.inner.flags)
}
}
/// Specifies the formats that can be compressed to with [`Bitmap::compress()`] and
/// [`Bitmap::compress_raw()`].
#[cfg(feature = "api-level-30")]
#[repr(i32)]
#[derive(Clone, Copy, Debug, Hash, PartialEq, Eq, FromPrimitive, IntoPrimitive)]
#[doc(alias = "AndroidBitmapCompressFormat")]
#[non_exhaustive]
pub enum BitmapCompressFormat {
/// Compress to the JPEG format.
///
/// quality of `0` means compress for the smallest size. `100` means compress for max visual
/// quality.
#[doc(alias = "ANDROID_BITMAP_COMPRESS_FORMAT_JPEG")]
Jpeg = ffi::AndroidBitmapCompressFormat::ANDROID_BITMAP_COMPRESS_FORMAT_JPEG.0 as i32,
/// Compress to the PNG format.
///
/// PNG is lossless, so quality is ignored.
#[doc(alias = "ANDROID_BITMAP_COMPRESS_FORMAT_PNG")]
Png = ffi::AndroidBitmapCompressFormat::ANDROID_BITMAP_COMPRESS_FORMAT_PNG.0 as i32,
/// Compress to the WEBP lossless format.
///
/// quality refers to how much effort to put into compression. A value of `0` means to
/// compress quickly, resulting in a relatively large file size. `100` means to spend more time
/// compressing, resulting in a smaller file.
#[doc(alias = "ANDROID_BITMAP_COMPRESS_FORMAT_WEBP_LOSSY")]
WebPLossy =
ffi::AndroidBitmapCompressFormat::ANDROID_BITMAP_COMPRESS_FORMAT_WEBP_LOSSY.0 as i32,
/// Compress to the WEBP lossy format.
///
/// quality of `0` means compress for the smallest size. `100` means compress for max visual quality.
#[doc(alias = "ANDROID_BITMAP_COMPRESS_FORMAT_WEBP_LOSSLESS")]
WebPLossless =
ffi::AndroidBitmapCompressFormat::ANDROID_BITMAP_COMPRESS_FORMAT_WEBP_LOSSLESS.0 as i32,
#[doc(hidden)]
#[num_enum(catch_all)]
__Unknown(i32),
}
/// Encapsulates possible errors returned by [`Bitmap::compress()`] or [`Bitmap::compress_raw()`].
#[cfg(feature = "api-level-30")]
#[derive(Debug, thiserror::Error)]
pub enum BitmapCompressError {
#[error(transparent)]
BitmapError(#[from] BitmapError),
/// [`Bitmap`] compression requires a known [`DataSpace`]. [`DataSpace::Unknown`] is invalid
/// even though it is typically treated as `sRGB`, for that [`DataSpace::Srgb`] has to be passed
/// explicitly.
#[error("The dataspace for this Bitmap is Unknown")]
DataSpaceUnknown,
}