skia

Want to learn graphics using Skia on Ubuntu [closed]

怎甘沉沦 提交于 2019-12-04 12:15:28
问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . I want to learn graphics programming, and I want to use Skia as the library. How do I begin with it on Ubuntu? 回答1: Use the r1236

How to draw text on an EGL texture using Skia SkBitmap?

北战南征 提交于 2019-12-04 06:11:34
问题 I am looking for a way to draw text on EGLTexture using Skia library in C/C++. I am planning to run a program that does it on Android platform during bootup before SurfaceFlinger comes up. Please don't point me to Android Java examples as that is not what I am looking for. I am troubleshooting UI issue at frame buffer level. I am looking for a way to do this in C/C++ using Android native libs (Skia etc). I have a sample program that can render an image using SkBitmap onto EGLTexture. I was

How to link the Skia library for a C++ project with Xcode

吃可爱长大的小学妹 提交于 2019-12-03 14:04:31
问题 Skia is a graphics library (skia.org). The documentation explains how to build the library after cloning the project via git. But the documentation is unclear as of this date, how to build a C++ project with Xcode which uses the Skia library. I tried all what is written in the documentation, but can't find a way of how to link the skia library in a C++ Xcode project. 回答1: How to Solve the Problem: Add Library Search Path This screenshot shows how and where to do these steps: Add Skia Library

Canvas.drawText() doesn't render large emojis on Android

断了今生、忘了曾经 提交于 2019-12-03 12:58:38
Canvas.drawText() doesn't render emojis above a certain font size on Android. Correct render at somewhere below 256 px: Incorrect render at above 256 px: (There is a similar question about Google Chrome, and just like Android, Chrome also uses the Skia graphics library, so this seems like a bug in Skia .) Apparently emojis fail to render above 256 px font size on my devices. But I'm not sure if this is the limit everywhere. Is there a way to learn the font size at which emojis disappear? Or is there a workaround for this? I've come up with a test (an empirical estimation) for the maximum font

Android Graphic : apk and Skia/OpenGL|ES

只愿长相守 提交于 2019-12-03 12:27:50
Android apk 里面的画图分为2D和3D两种:2D是由 Skia 来实现的,也就是我们在框架图上看到的SGL,SGL也会调用部分 opengl 的内容来实现简单的3D效果;3D部分是由OpenGL|ES实现的,OpenGL|ES是Opengl的嵌入式版本,我们先了解一下Android apk的几种画图方式,然后再来来看一看这一整套的图形体系是怎么建立的。 首先画图都是针对提供给 应用 程序的一块内存填充 数据 , 没去研究过一个Activity是否就对应着底层的一个surface,但是应该都是对这块surface内存进行操作。因此说穿了就是我们要么调用2D 的API画图,要么调用3D的API画图,然后将画下来的图保存在这个内存中,最后这个内存里面的内容会被Opengl渲染以后变为可以在屏幕上的像素信息。 一 、Apk应用主要关心的还是这些API的使用,在Android apk里面画图有2种方式 [2D]: 1、Simple Graphics in View 就是直接使用Android已经实现的一些画图操作,比如说images,shapes,colors,pre-defined animation等等,这些简单的画图操作实际上是由skia来提供的2D图形操作。使用这些预定义好的操作,我们可以实现诸如贴一张背景图啊,画出简单的形状,实现一些简单的动画之类的操作

Using Skia in Android NDK

两盒软妹~` 提交于 2019-12-03 11:40:30
问题 Is it true that android.graphics.* depends on the native Skia library? If so, is it possible to access the Skia library in my native C/C++ codes? 回答1: Skia is not offered as a lib/sharedlib inside android, as its api is not guaranteed to be stable over time. there is no sample implementation of controls in C/C++, all the widget/view sub-system is done in Java for skia http://code.google.com/p/skia/ 回答2: Skia can be use using native c/c++ code but you need android source to build your app and

How to link the Skia library for a C++ project with Xcode

痴心易碎 提交于 2019-12-03 05:04:32
Skia is a graphics library ( skia.org ). The documentation explains how to build the library after cloning the project via git. But the documentation is unclear as of this date, how to build a C++ project with Xcode which uses the Skia library. I tried all what is written in the documentation, but can't find a way of how to link the skia library in a C++ Xcode project. nuiun How to Solve the Problem: Add Library Search Path This screenshot shows how and where to do these steps: Add Skia Library Path Image In the Project Navigator click the icon of your project. In the panel on the left of the

skia android编译错误解决

匿名 (未验证) 提交于 2019-12-03 00:34:01
编译的时候,总是提示SkImageDecoder.h头文件出错, 就是要更新一下依赖库, 然后重新 python tools / git - sync - deps后 重新编译bin\gn.exe gen out/armv7 --args="is_debug=false ndk=\"E:/android/android-ndk-r16b\" target_cpu=\"arm\"" 然后ninja -C out\armv7即可。 文章来源: skia android编译错误解决

How to draw text on an EGL texture using Skia SkBitmap?

一世执手 提交于 2019-12-02 07:31:59
I am looking for a way to draw text on EGLTexture using Skia library in C/C++. I am planning to run a program that does it on Android platform during bootup before SurfaceFlinger comes up. Please don't point me to Android Java examples as that is not what I am looking for. I am troubleshooting UI issue at frame buffer level. I am looking for a way to do this in C/C++ using Android native libs (Skia etc). I have a sample program that can render an image using SkBitmap onto EGLTexture. I was able to display it on monitor. I followed same example and came up with a strategy like this. But it

浅谈跨平台框架 Flutter 的优势与结构

和自甴很熟 提交于 2019-12-01 16:09:52
作者:个推iOS工程师 伊泽瑞尔 一、背景 目前,移动开发技术主要分为原生开发和跨平台开发两种。其中,原生应用是指在某个特定的移动平台上,使用平台所支持的开发工具和语言,直接调用系统提供的API所开发的应用。 原生开发的主要优势体现在: 1.可以快速访问本平台的全部功能,比如摄像头、GPS等; 2.原生应用的速度快、性能高,而且可以实现比较复杂的动画和绘制效果,用户体验较好。 原生开发的缺点也很明显,主要体现在: 1.开发成本较高,不同的平台必须维护不同的代码,人力成本也会随之增加; 2.有新的功能需要更新时,只能进行版本升级。 随着移动互联网的高速发展,在很多的业务场景下,传统的纯原生开发已经不能满足日益增长的业务需求,主要表现在以下两个方面: 1.应用动态化的需求增大。当需求发生变化,或者是需要增加新的功能时,传统的纯原生应用开发只能通过版本的升级来更新内容,然而应用的上架和审核都需要一定的时间。因此,开发人员迫切地希望进行应用内容的更新时,可以不更新版本,提升工作效率。 2.业务需求变化快,开发成本变高。原生开发一般需要技术团队对iOS、Android两个开发平台进行维护。当版本更新迭代时,开发和测试的成本都会增加。 针对上述两个问题,跨平台框架应运而生。 二、跨平台技术简介 针对上文提到的原生开发所面临的问题,目前在IT界已经诞生了很多跨平台框架,主要分为三类: 1.H5