| // Copyright 2020 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "third_party/blink/renderer/core/css/vision_deficiency.h" |
| |
| #include "base/notreached.h" |
| #include "third_party/blink/renderer/platform/wtf/text/atomic_string.h" |
| #include "third_party/blink/renderer/platform/wtf/text/string_view.h" |
| #include "third_party/blink/renderer/platform/wtf/text/wtf_string.h" |
| |
| namespace blink { |
| |
| namespace { |
| |
| AtomicString CreateFilterDataUrl(const char* piece) { |
| return "data:image/svg+xml,<svg xmlns=\"http://www.w3.org/2000/svg\">" |
| "<filter id=\"f\">" + |
| StringView(piece) + "</filter></svg>#f"; |
| } |
| |
| } // namespace |
| |
| AtomicString CreateVisionDeficiencyFilterUrl( |
| VisionDeficiency vision_deficiency) { |
| // The filter color matrices are based on the following research paper: |
| // Gustavo M. Machado, Manuel M. Oliveira, and Leandro A. F. Fernandes, |
| // "A Physiologically-based Model for Simulation of Color Vision Deficiency". |
| // IEEE Transactions on Visualization and Computer Graphics. Volume 15 (2009), |
| // Number 6, November/December 2009. pp. 1291-1298. |
| // https://www.inf.ufrgs.br/~oliveira/pubs_files/CVD_Simulation/CVD_Simulation.html |
| // |
| // The filter grayscale matrix is based on the following research paper: |
| // Rang Man Ho Nguyen and Michael S. Brown, |
| // "Why You Should Forget Luminance Conversion and Do Something Better". |
| // IEEE Conference on Computer Vision and Pattern Recognition (CVPR), |
| // Honolulu, HI, 2017. pp. 6750-6758. |
| // https://openaccess.thecvf.com/content_cvpr_2017/papers/Nguyen_Why_You_Should_CVPR_2017_paper.pdf |
| switch (vision_deficiency) { |
| case VisionDeficiency::kAchromatopsia: |
| return CreateFilterDataUrl( |
| "<feColorMatrix values=\"" |
| "0.213 0.715 0.072 0.000 0.000 " |
| "0.213 0.715 0.072 0.000 0.000 " |
| "0.213 0.715 0.072 0.000 0.000 " |
| "0.000 0.000 0.000 1.000 0.000 " |
| "\"/>"); |
| case VisionDeficiency::kBlurredVision: |
| return CreateFilterDataUrl("<feGaussianBlur stdDeviation=\"2\"/>"); |
| case VisionDeficiency::kDeuteranopia: |
| return CreateFilterDataUrl( |
| "<feColorMatrix values=\"" |
| " 0.367 0.861 -0.228 0.000 0.000 " |
| " 0.280 0.673 0.047 0.000 0.000 " |
| "-0.012 0.043 0.969 0.000 0.000 " |
| " 0.000 0.000 0.000 1.000 0.000 " |
| "\"/>"); |
| case VisionDeficiency::kProtanopia: |
| return CreateFilterDataUrl( |
| "<feColorMatrix values=\"" |
| " 0.152 1.053 -0.205 0.000 0.000 " |
| " 0.115 0.786 0.099 0.000 0.000 " |
| "-0.004 -0.048 1.052 0.000 0.000 " |
| " 0.000 0.000 0.000 1.000 0.000 " |
| "\"/>"); |
| case VisionDeficiency::kTritanopia: |
| return CreateFilterDataUrl( |
| "<feColorMatrix values=\"" |
| " 1.256 -0.077 -0.179 0.000 0.000 " |
| "-0.078 0.931 0.148 0.000 0.000 " |
| " 0.005 0.691 0.304 0.000 0.000 " |
| " 0.000 0.000 0.000 1.000 0.000 " |
| "\"/>"); |
| case VisionDeficiency::kNoVisionDeficiency: |
| NOTREACHED(); |
| return ""; |
| } |
| } |
| |
| } // namespace blink |
