文本和矢量艺术的快速光栅化
假设有很多矢量形状（确定形状边界的贝塞尔曲线）。例如，一页上全是小字母。
创建位图的最快方法是什么？
我几年前曾经看过一个演示（现在找不到了），其中一些人使用 GPU 来光栅化矢量艺术 - 他们能够实时放大/缩小页面。贝塞尔曲线形状的 GPU 渲染当前状态如何？真的很快吗？比CPU还快？常见和不常见的算法有哪些？有没有这样的开源库？它使用什么语言？那么OpenGL呢？
Suppose there is a lot of vector shapes (Bezier curves which determine the boundary of a shape). For example a page full of tiny letters.
What is the fastest way to create a bitmap out of it?
I once saw a demo several years ago (can't find it now) where some guys used GPU to rasterize the vector art - they were able to zoom in/out of the page in real-time. What is the current state of GPU rendering of Bezier shapes? Is it really fast? Faster than CPU? What are the common and not-so-common algorithms? Is there any open source library for such things? What language does it use? What about OpenGL?
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NVIDIA 现在有一个 OpenGL 扩展可以做到这一点。我猜它是基于 Microsoft RAVG 论文。
http://developer.nvidia.com/nv-path-rendering
NVIDIA has now an extension for OpenGL that can do this stuff. I guess it's based on the Microsoft RAVG paper.
http://developer.nvidia.com/nv-path-rendering
也许您指的是以下论文之一：
一般矢量图形的随机访问渲染 (2008 ）（PDF)
使用可编程图形硬件进行与分辨率无关的曲线渲染 (2005) (PDF)
我认为这些几乎是最先进的。
Perhaps you mean one of these papers:
Random-access rendering of general vector graphics (2008) (PDF)
Resolution independent curve rendering using programmable graphics hardware (2005) (PDF)
I think these are pretty much the state of the art.
会是这个吗？
http://alice.loria.fr/index.php/publications .html?Paper=VTM@2005
和几年前差不多。曲面细分着色器确实有帮助，但当涉及到没有中间曲面细分阶段的光栅化曲线时，片段着色器中的工作就很繁重了。
Could it have been this one?
http://alice.loria.fr/index.php/publications.html?Paper=VTM@2005
About the same like some years ago. Tesselation shaders do help, but when it comes down to rasterizing curves without a intermediary tesselation stage, it's grunt work in the fragment shader.