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// 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 "third_party/blink/renderer/platform/wtf/text/wtf_string.h"
namespace blink {
AtomicString CreateFilterDataUrl(AtomicString piece) {
// clang-format off
AtomicString url =
"data:image/svg+xml,"
"<svg xmlns=\"http://www.w3.org/2000/svg\">"
"<filter id=\"f\">" +
piece +
"</filter>"
"</svg>"
"#f";
// clang-format on
return url;
}
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
switch (vision_deficiency) {
case VisionDeficiency::kAchromatopsia:
return CreateFilterDataUrl(
"<feColorMatrix values=\""
"0.299 0.587 0.114 0.000 0.000 "
"0.299 0.587 0.114 0.000 0.000 "
"0.299 0.587 0.114 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
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