JNI-based apparatus and method for Android system to call Qt picture drawing system in multithread manner

A multi-threading and threading technology, applied in the direction of 2D image generation, image data processing, and extraction from basic elements, etc., can solve problems such as slow canvas drawing, and achieve the effect of improving work efficiency, obvious drawing speed, and improving user experience.

Active Publication Date: 2018-03-20
SHENZHEN HONGHE INNOVATION INFORMATION TECH CO LTD
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Problems solved by technology

[0003] In view of this, the object of the present invention is to provide a kind of device and the method that Android system calls Qt drawing by JNI multi-threading, it adopts SurfaceView to carry out partial refresh technology, multi-threading technology, Qt drawing technology, effectively solves the Android system through canvas Problem with slow drawing

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  • JNI-based apparatus and method for Android system to call Qt picture drawing system in multithread manner
  • JNI-based apparatus and method for Android system to call Qt picture drawing system in multithread manner
  • JNI-based apparatus and method for Android system to call Qt picture drawing system in multithread manner

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[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0035] It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are to distinguish two entities with the same name but different parameters or parameters that are not the same, see "first" and "second" It is only for the convenience of expression, and should not be construed as a limitation on the embodiments of the present invention, which will not be described one by one in the subsequent embodiments.

[0036] As well known to those skilled in the art, Qt is a cross-platform C++ graphical user interface application program framework developed by Trolltech in 1991, which provides application developers with all the functions required to establish an art-level graphical...

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Abstract

The invention discloses a JNI-based apparatus and method for an Android system to call a Qt picture drawing system in a multithread manner. The method comprises the following steps: the Android systemis operated, system memory is cleared, painting canvas initialization is performed, and an so dynamic library is activated to do preparation work for calling the Qt picture drawing system; if the painting canvas initialization fails, the so dynamic library is activated again; after successful activation of the so dynamic library, an image data sampling thread and a SurfaceView drawing thread arestarted at the same time in a first language environment, operation of the image data sampling thread is performed, coordinate points are generated via a picture drawing MotionEvent, a rectangular frame is drawn according to the generated coordinate points via an Rect command, point coordinates float (x, y) are loaded to the so dynamic library, a picture is drawn by the Qt picture drawing system according to the point coordinates float (x, y), operation of the SurfaceView drawing thread is performed, the picture is drawn via SurfaceView built in the Android system, and the picture drawn via SurfaceView is displayed on a display device. Picture drawing speed is improved markedly, and cross platform calling is realized.

Description

technical field [0001] The invention relates to the field of embedded platform drawing, in particular to a device and method for calling Qt drawing by Android based on JNI multithreading. Background technique [0002] Currently, smart terminals using the Android operating system are widely used. The Android system usually uses a graphics processing engine, the 2D part is provided by the android SDK itself, the 3D part uses Open GL ES 1.0, and the APIs used in the 2D part are mainly in the android.graphics and android.graphics.drawable packages, which provide Canvas, ColorFilter, Point (point) and RetcF (rectangle) related to graphics processing, and some animation related ones such as AnimationDrawable, BitmapDrawable and TransitionDrawable. In terms of graphics processing, the most commonly used is to draw some pictures, shapes or custom text content on a View, and these contents are currently implemented using Canvas, by obtaining the Canvas object in the View, draw some ...

Claims

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Application Information

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IPC IPC(8): G06T11/20G06T13/80G06T1/20
CPCG06T1/20G06T11/203G06T13/80
Inventor 杨希怀
Owner SHENZHEN HONGHE INNOVATION INFORMATION TECH CO LTD
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