gpu accelerated rendering in adobe illustrator...

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GPU Accelerated Rendering In Adobe Illustrator CCVineet Batra | Senior Computer Scientist | Adobe Systems


Introduction

Adobe’s very first application when released over 27 years ago

Industry-standard for vector graphics

Sophisticated graphics capabilities for printing, compositing and photo-realistic shading

Rich feature set including text, images, layers, transparency, blending modes and filters

Uses Adobe PDF standard for its underlying rendering capabilities

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Introduction

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Rich Feature Set

BeautifulIllustrations


Vectors are not Pixels!


Vectors are not Pixels!

Level of Detail


Rendering : Building Blocks

• Transparency• Mask• Blend

Paths Paint Composite

• Color• Image• Pattern• Gradient

• Cubic Beziers• Fill & Stroke• Dash• Join• Cap• Miter


Rendering : CPU Pipeline

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• Generate path coverage• Super-sampling Anti-aliasing• Overscan

• Compute color values• Compute alpha values• Combine with coverage

• Based on Porter-Duff image composition model

• Additional transparency attributes and blend modes

The entire pipeline is resolution dependent!

Rasterize Paint CompositeBlit


CPU Rendering Performance

Intel(R) Xeon(R) CPU E3-1240 V2 @3.40GHz, 4 cores, 8 GB RAM

Performance

Pixels1680

X

1050

3840 X

2160

Time(ms) 178 608

FPS ~6 ~1.5

Complexity

11K+ Paths

2K+ Transparent Objects

~2K Gradients


CPU Rendering Performance (contd.)

Performance

Pixels1680

X

1050

3840 X

2160

Time(ms) 928 2073

FPS ~1 ~0.5

Complexity

~130K Paths

~66K Transparent Objects

Intel(R) Xeon(R) CPU E3-1240 V2 @3.40GHz, 4 cores, 8 GB RAM


Challenges in Vector Graphics Rendering

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Increasing screen resolutiono CPUs not able to keep up with fill rate

o HD, Retina, 4K, …

Interactive user experience Illustrator users want actual appearance while drawing

Increased expectations around responsiveness due to proliferation of touch devices

Increased complexity of artwork based on natural drawing paradigms

Changing technological landscapeo Increasing gap between pixel density and CPU compute power

o GPUs are mainstream and making full use of GPUs is essential for any modern computing platform

o Current graphics APIs on GPU are not optimal for compositing vector graphics


Moving Rendering to GPU

Considerations and Constraints

o GPU vendors have different compliance with OpenGL standard

o No native support for cubic Bezier curves

Resolution dependent tessellation

o No native support for Adobe PDF graphics model

Transparency compositing

Blend Modes

o Non-RGB color spaces

o Anti-aliasing quality

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Using NVIDIA GPUs

NV Path Rendering

o Intrinsic support for cubic Bezier curves

o Understands Adobe PDF path rendering attributes (e.g. dash, cap, etc.)

o Supports SVG path formats as well

o Resolution-independent 2D graphics

o Allows use of programmable shaders to generate complex appearance

o API provides high level of abstraction

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Using NV Path Rendering

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Creation & DeletionglGenPathsNVglPathCommandsNVglDeletePathsNV

FillglStencilFillPathNVglCoverFillPathNV

StrokeglStencilStrokePathNVglCoverStrokePathNV

Dash glPathDashArrayNV

Path Parameters glPathParameteriNV

Stroke Width GL_PATH_STROKE_WIDTH_NV

Cap & JoinGL_PATH_END_CAPS_NVGL_PATH_JOIN_STYLE_NV

Miter GL_PATH_MITER_LIMIT_NV


Using NVIDIA GPUs

NV Blend Equation Advanced

o Provides native support for Adobe PDF Blend modes

o Faster performance than shader based blending

o Implemented in hardware in upcoming cards (Maxwell and later)

o Included in Khronos standard specification

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Using NV Blend Equation Advanced

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glBlendEquation


GPU Rendering Performance

Performance

Pixels1680

X

1050

3840 X

2160

CPU178 ms 608 ms

6 fps 1.5 fps

GPU 38 ms 55 ms

26 fps 18 fps

Gain ~4.7x ~11x

Complexity

~11K Paths


~2K Gradients

Intel(R) Xeon(R) CPU E3-1240 vs NVIDIA GeForce GTX 780 Ti



Performance

Pixels1680

X

1050

3840 X

2160

CPU928 ms 2073 ms

~1 fps ~0.5 fps

GPU131 ms 170 ms

8 fps 6 fps

Gain ~7x ~12x

Complexity

~130K Paths




Demo

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Performance

Pixels1680

X

1050

3840 X

2160

CPU928 ms 2073 ms

~1 fps ~0.5 fps

GPU131 ms 170 ms

8 fps 6 fps

Gain ~7x ~12x

Complexity

~130K Paths




Remaining Challenges

Text

o No support for rich typographic features Unicode, Open Type fonts etc.

o No Font Hinting, require bitmaps for quality

Non-RGB color spaces

o CMYK

o Spot colors

o Color Profiles

Thin Strokes

o GPUs struggle to render thin strokes

Transparency groups

o Isolated, Non-isolated and knockout groups

o Requires lot of texture copying (slow)

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Questions

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UPCOMING GTC EXPRESS WEBINARSWednesday, September 17 CUDA 6.5 – Performance Overview

Jonathan Cohen, NVIDIA

Wednesday, September 24 Convolutional Networks: A Unified Machine Learning Approach to Computer PerceptionYann LeCun, Facebook & NYU

Wednesday, October 15 Essential CUDA Optimization TechniquesChris Mason, Acceleware

Register at www.gputechconf.com/gtcexpress

GTC 2015 CALL FOR SUBMISSIONS

Closes October 6

Submit proposals for:

TalksPosters

For more information and to submit a proposal go to:

www.gputechconf.com/presenters

gpu accelerated rendering in adobe illustrator...

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