Low-level services to load pixel data from the assets

Redefined classes

redef class CByteArray

android :: load_image $ CByteArray

Wrapper around an array of unsigned char in C (unsigned char*) with length and destroy state
redef enum Int

android :: load_image $ Int

Native integer numbers.
redef extern class NativeCByteArray

android :: load_image $ NativeCByteArray

An array of unsigned char in C (unsigned char*)

All class definitions

redef class CByteArray

android :: load_image $ CByteArray

Wrapper around an array of unsigned char in C (unsigned char*) with length and destroy state
redef enum Int

android :: load_image $ Int

Native integer numbers.
redef extern class NativeCByteArray

android :: load_image $ NativeCByteArray

An array of unsigned char in C (unsigned char*)
package_diagram android::load_image load_image android::assets_and_resources assets_and_resources android::load_image->android::assets_and_resources c c android::load_image->c android::dalvik dalvik android::assets_and_resources->android::dalvik java::io io android::assets_and_resources->java::io core core c->core ...android::dalvik ... ...android::dalvik->android::dalvik ...java::io ... ...java::io->java::io ...core ... ...core->core gamnit::display_android display_android gamnit::display_android->android::load_image gamnit::gamnit_android gamnit_android gamnit::gamnit_android->gamnit::display_android gamnit::gamnit_android... ... gamnit::gamnit_android...->gamnit::gamnit_android


module abstract_collection

core :: abstract_collection

Abstract collection classes and services.
module abstract_text

core :: abstract_text

Abstract class for manipulation of sequences of characters
module activities

android :: activities

Android Activities wrapper
module app

app :: app

app.nit is a framework to create cross-platform applications
module app_base

app :: app_base

Base of the app.nit framework, defines App
module array

core :: array

This module introduces the standard array structure.
module assets

app :: assets

Portable services to load resources from the assets folder
module aware

android :: aware

Android compatibility module
module bitset

core :: bitset

Services to handle BitSet
module bytes

core :: bytes

Services for byte streams and arrays
module circular_array

core :: circular_array

Efficient data structure to access both end of the sequence.
module codec_base

core :: codec_base

Base for codecs to use with streams
module codecs

core :: codecs

Group module for all codec-related manipulations
module collection

core :: collection

This module define several collection classes.
module collections

java :: collections

Basic Java collections
module core

core :: core

Standard classes and methods used by default by Nit programs and libraries.
module dalvik

android :: dalvik

Java related services specific to Android and its Dalvik VM
module environ

core :: environ

Access to the environment variables of the process
module error

core :: error

Standard error-management infrastructure.
module exec

core :: exec

Invocation and management of operating system sub-processes.
module ffi_support

java :: ffi_support

Core supporting services for the FFI with Java
module file

core :: file

File manipulations (create, read, write, etc.)
module fixed_ints

core :: fixed_ints

Basic integers of fixed-precision
module fixed_ints_text

core :: fixed_ints_text

Text services to complement fixed_ints
module flat

core :: flat

All the array-based text representations
module gc

core :: gc

Access to the Nit internal garbage collection mechanism
module hash_collection

core :: hash_collection

Introduce HashMap and HashSet.
module io

java :: io

Services from the java.io package
module iso8859_1

core :: iso8859_1

Codec for ISO8859-1 I/O
module java

java :: java

Supporting services for the FFI with Java and to access Java libraries
module jvm

jvm :: jvm

Java Virtual Machine invocation API and others services from the JNI C API
module kernel

core :: kernel

Most basic classes and methods.
module list

core :: list

This module handle double linked lists
module math

core :: math

Mathematical operations
module native

core :: native

Native structures for text and bytes
module numeric

core :: numeric

Advanced services for Numeric types
module platform

android :: platform

Triggers compilation for the android platform
module protocol

core :: protocol

module queue

core :: queue

Queuing data structures and wrappers
module range

core :: range

Module for range of discrete objects.
module re

core :: re

Regular expression support for all services based on Pattern
module ropes

core :: ropes

Tree-based representation of a String.
module sorter

core :: sorter

This module contains classes used to compare things and sorts arrays.
module stream

core :: stream

Input and output streams of characters
module text

core :: text

All the classes and methods related to the manipulation of text entities
module time

core :: time

Management of time and dates
module union_find

core :: union_find

union–find algorithm using an efficient disjoint-set data structure
module utf8

core :: utf8

Codec for UTF-8 I/O


module assets_and_resources

android :: assets_and_resources

Android Assets and Resources Management
module c

c :: c

Structures and services for compatibility with the C language


module display_android

gamnit :: display_android

Gamnit display implementation for Android


module a_star-m


module android19

gamnit :: android19

Variation using features from Android API 19
module camera_control_android

gamnit :: camera_control_android

Two fingers camera manipulation, pinch to zoom and slide to scroll
module gamnit_android

gamnit :: gamnit_android

Support services for Gamnit on Android
module sensors

android :: sensors

Access Android sensors
# Low-level services to load pixel data from the assets
module load_image

intrude import android::assets_and_resources
import c

redef class CByteArray
	# Get a `Java_nio_ByteBuffer` wrapping `native_array`
	fun to_java_nio_buffer: Java_nio_ByteBuffer
		return jni_env.new_direct_byte_buffer(native_array, length)

redef extern class NativeBitmap

	# Copy the pixel data into a new `CByteArray`
	# If `pad_to_pow2` the new buffer contains artificial pixels used to make
	# the width and the height powers of 2 for compatibility with older OpenGL.
	# If `unmultiply`, extra work is done to revert the multiplication of color
	# values per the alpha channel applied by the Android system.
	fun copy_pixels(pad_to_pow2, unmultiply: nullable Bool): CByteArray
		var height = height
		var row_bytes = row_bytes
		var bytes = row_bytes * height

		var w2 = width.next_pow(2)
		var h2 = height.next_pow(2)
		var row_bytes2 = row_bytes * w2 / width

		var capacity = bytes
		if pad_to_pow2 == true then capacity = row_bytes2 * h2

		var buf = new CByteArray(capacity)
		var java_buf = buf.to_java_nio_buffer
		copy_pixels_to_buffer java_buf

		if has_alpha and unmultiply == true then buf.native_array.unmultiply(width, height)

		if pad_to_pow2 == true then
			for r in [height-1..0[.step(-1) do
				var src_offset = row_bytes*r
				var dst_offset = row_bytes2*r
				buf.move(dst_offset, src_offset, row_bytes)

		return buf

	# Copy raw pixel data to `buffer`
	# Wraps Java: `void android.graphics.Bitmap.copyPixelsToBuffer(java.nio.Buffer)`
	fun copy_pixels_to_buffer(buffer: Java_nio_Buffer) in "Java" `{

redef universal Int
	# The first power of `exp` greater or equal to `self`
	private fun next_pow(exp: Int): Int
		var p = 1
		while p < self do p = p*exp
		return p

redef class NativeCByteArray
	# Reverse Android multiplication of color values per the alpha channel
	private fun unmultiply(w, h: Int) `{
		int offset = 0;
		int x, y;
		for (x = 0; x < w; x ++)
			for (y = 0; y < h; y ++) {
				unsigned char a = self[offset+3];
				if (a != 0 && a != 0xFF) {
					self[offset] = self[offset] * 256 / a;
					self[offset+1] = self[offset+1] * 256 / a;
					self[offset+2] = self[offset+2] * 256 / a;
				offset += 4;