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// Copyright 2020 The Chromium Authors
// 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/strcat.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) {
// TODO(mathias): Remove `color-interpolation-filters` attribute once
// crbug.com/335066 is fixed. See crbug.com/1270748.
return AtomicString(WTF::StrCat(
{"data:image/svg+xml,<svg xmlns=\"http://www.w3.org/2000/svg\"><filter "
"id=\"f\" color-interpolation-filters=\"linearRGB\">",
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::kBlurredVision:
return CreateFilterDataUrl("<feGaussianBlur stdDeviation=\"2\"/>");
case VisionDeficiency::kReducedContrast:
return CreateFilterDataUrl(
"<feComponentTransfer>"
" <feFuncR type=\"gamma\" offset=\"0.5\"/>"
" <feFuncG type=\"gamma\" offset=\"0.5\"/>"
" <feFuncB type=\"gamma\" offset=\"0.5\"/>"
"</feComponentTransfer>");
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::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();
}
}
} // namespace blink
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