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-rw-r--r--services/surfaceflinger/RenderEngine/ProgramCache.cpp230
1 files changed, 78 insertions, 152 deletions
diff --git a/services/surfaceflinger/RenderEngine/ProgramCache.cpp b/services/surfaceflinger/RenderEngine/ProgramCache.cpp
index 57a772b047..5f09ac0d9b 100644
--- a/services/surfaceflinger/RenderEngine/ProgramCache.cpp
+++ b/services/surfaceflinger/RenderEngine/ProgramCache.cpp
@@ -233,177 +233,103 @@ void ProgramCache::generateEOTF(Formatter& fs, const Key& needs) {
}
// Generate OOTF that modifies the relative scence light to relative display light.
-void ProgramCache::generateOOTF(Formatter& fs, const ProgramCache::Key& needs) {
- // When HDR and non-HDR contents are mixed, or different types of HDR contents are
- // mixed, we will do a transcoding process to transcode the input content to output
- // content. Currently, the following conversions handled, they are:
- // * SDR -> HLG
- // * SDR -> PQ
- // * HLG -> PQ
-
- // Convert relative light to absolute light.
- switch (needs.getInputTF()) {
+void ProgramCache::generateOOTF(Formatter& fs, const Key& needs) {
+ fs << R"__SHADER__(
+ highp float CalculateY(const highp vec3 color) {
+ // BT2020 standard uses the unadjusted KR = 0.2627,
+ // KB = 0.0593 luminance interpretation for RGB conversion.
+ return color.r * 0.262700 + color.g * 0.677998 + color.b * 0.059302;
+ }
+ )__SHADER__";
+
+ // Generate OOTF that modifies the relative display light.
+ switch(needs.getInputTF()) {
case Key::INPUT_TF_ST2084:
fs << R"__SHADER__(
- highp vec3 ScaleLuminance(color) {
- return color * 10000.0;
+ highp vec3 OOTF(const highp vec3 color) {
+ const float maxLumi = 10000.0;
+ const float maxMasteringLumi = 1000.0;
+ const float maxContentLumi = 1000.0;
+ const float maxInLumi = min(maxMasteringLumi, maxContentLumi);
+ float maxOutLumi = displayMaxLuminance;
+
+ // Calculate Y value in XYZ color space.
+ float colorY = CalculateY(color);
+
+ // convert to nits first
+ float nits = colorY * maxLumi;
+
+ // clamp to max input luminance
+ nits = clamp(nits, 0.0, maxInLumi);
+
+ // scale [0.0, maxInLumi] to [0.0, maxOutLumi]
+ if (maxInLumi <= maxOutLumi) {
+ nits *= maxOutLumi / maxInLumi;
+ } else {
+ // three control points
+ const float x0 = 10.0;
+ const float y0 = 17.0;
+ float x1 = maxOutLumi * 0.75;
+ float y1 = x1;
+ float x2 = x1 + (maxInLumi - x1) / 2.0;
+ float y2 = y1 + (maxOutLumi - y1) * 0.75;
+
+ // horizontal distances between the last three control points
+ float h12 = x2 - x1;
+ float h23 = maxInLumi - x2;
+ // tangents at the last three control points
+ float m1 = (y2 - y1) / h12;
+ float m3 = (maxOutLumi - y2) / h23;
+ float m2 = (m1 + m3) / 2.0;
+
+ if (nits < x0) {
+ // scale [0.0, x0] to [0.0, y0] linearly
+ const float slope = y0 / x0;
+ nits *= slope;
+ } else if (nits < x1) {
+ // scale [x0, x1] to [y0, y1] linearly
+ float slope = (y1 - y0) / (x1 - x0);
+ nits = y0 + (nits - x0) * slope;
+ } else if (nits < x2) {
+ // scale [x1, x2] to [y1, y2] using Hermite interp
+ float t = (nits - x1) / h12;
+ nits = (y1 * (1.0 + 2.0 * t) + h12 * m1 * t) * (1.0 - t) * (1.0 - t) +
+ (y2 * (3.0 - 2.0 * t) + h12 * m2 * (t - 1.0)) * t * t;
+ } else {
+ // scale [x2, maxInLumi] to [y2, maxOutLumi] using Hermite interp
+ float t = (nits - x2) / h23;
+ nits = (y2 * (1.0 + 2.0 * t) + h23 * m2 * t) * (1.0 - t) * (1.0 - t) +
+ (maxOutLumi * (3.0 - 2.0 * t) + h23 * m3 * (t - 1.0)) * t * t;
+ }
+ }
+
+ // convert back to [0.0, 1.0]
+ float targetY = nits / maxOutLumi;
+ return color * (targetY / max(1e-6, colorY));
}
)__SHADER__";
break;
case Key::INPUT_TF_HLG:
fs << R"__SHADER__(
- highp vec3 ScaleLuminance(color) {
+ highp vec3 OOTF(const highp vec3 color) {
+ const float maxOutLumi = 500.0;
+ const float gamma = 1.2 + 0.42 * log(maxOutLumi / 1000.0) / log(10.0);
// The formula is:
// alpha * pow(Y, gamma - 1.0) * color + beta;
- // where alpha is 1000.0, gamma is 1.2, beta is 0.0.
- return color * 1000.0 * pow(color.y, 0.2);
+ // where alpha is 1.0, beta is 0.0 as recommended in
+ // Rec. ITU-R BT.2100-1 TABLE 5.
+ return pow(CalculateY(color), gamma - 1.0) * color;
}
)__SHADER__";
break;
default:
fs << R"__SHADER__(
- highp vec3 ScaleLuminance(color) {
- return color * displayMaxLuminance;
- }
- )__SHADER__";
- break;
- }
-
- // Tone map absolute light to display luminance range.
- switch (needs.getInputTF()) {
- case Key::INPUT_TF_ST2084:
- case Key::INPUT_TF_HLG:
- switch (needs.getOutputTF()) {
- case Key::OUTPUT_TF_HLG:
- // Right now when mixed PQ and HLG contents are presented,
- // HLG content will always be converted to PQ. However, for
- // completeness, we simply clamp the value to [0.0, 1000.0].
- fs << R"__SHADER__(
- highp vec3 ToneMap(color) {
- return clamp(color, 0.0, 1000.0);
- }
- )__SHADER__";
- break;
- case Key::OUTPUT_TF_ST2084:
- fs << R"__SHADER__(
- highp vec3 ToneMap(color) {
- return color;
- }
- )__SHADER__";
- break;
- default:
- fs << R"__SHADER__(
- highp vec3 ToneMap(color) {
- const float maxMasteringLumi = 1000.0;
- const float maxContentLumi = 1000.0;
- const float maxInLumi = min(maxMasteringLumi, maxContentLumi);
- float maxOutLumi = displayMaxLuminance;
-
- float nits = color.y;
-
- // clamp to max input luminance
- nits = clamp(nits, 0.0, maxInLumi);
-
- // scale [0.0, maxInLumi] to [0.0, maxOutLumi]
- if (maxInLumi <= maxOutLumi) {
- nits *= maxOutLumi / maxInLumi;
- } else {
- // three control points
- const float x0 = 10.0;
- const float y0 = 17.0;
- float x1 = maxOutLumi * 0.75;
- float y1 = x1;
- float x2 = x1 + (maxInLumi - x1) / 2.0;
- float y2 = y1 + (maxOutLumi - y1) * 0.75;
-
- // horizontal distances between the last three control points
- const float h12 = x2 - x1;
- const float h23 = maxInLumi - x2;
- // tangents at the last three control points
- const float m1 = (y2 - y1) / h12;
- const float m3 = (maxOutLumi - y2) / h23;
- const float m2 = (m1 + m3) / 2.0;
-
- if (nits < x0) {
- // scale [0.0, x0] to [0.0, y0] linearly
- const float slope = y0 / x0;
- nits *= slope;
- } else if (nits < x1) {
- // scale [x0, x1] to [y0, y1] linearly
- const float slope = (y1 - y0) / (x1 - x0);
- nits = y0 + (nits - x0) * slope;
- } else if (nits < x2) {
- // scale [x1, x2] to [y1, y2] using Hermite interp
- float t = (nits - x1) / h12;
- nits = (y1 * (1.0 + 2.0 * t) + h12 * m1 * t) * (1.0 - t) * (1.0 - t) +
- (y2 * (3.0 - 2.0 * t) + h12 * m2 * (t - 1.0)) * t * t;
- } else {
- // scale [x2, maxInLumi] to [y2, maxOutLumi] using Hermite interp
- float t = (nits - x2) / h23;
- nits = (y2 * (1.0 + 2.0 * t) + h23 * m2 * t) * (1.0 - t) * (1.0 - t) +
- (maxOutLumi * (3.0 - 2.0 * t) + h23 * m3 * (t - 1.0)) * t * t;
- }
- }
-
- return color * (nits / max(1e-6, color.y));
- }
- )__SHADER__";
- break;
- }
- break;
- default:
- // TODO(73825729) We need to revert the tone mapping in
- // hardware composer properly.
- fs << R"__SHADER__(
- highp vec3 ToneMap(color) {
+ highp vec3 OOTF(const highp vec3 color) {
return color;
}
)__SHADER__";
break;
}
-
- // convert absolute light to relative light.
- switch (needs.getOutputTF()) {
- case Key::OUTPUT_TF_ST2084:
- fs << R"__SHADER__(
- highp vec3 NormalizeLuminance(color) {
- return color / 10000.0;
- }
- )__SHADER__";
- break;
- case Key::OUTPUT_TF_HLG:
- fs << R"__SHADER__(
- highp vec3 NormalizeLuminance(color) {
- return color / 1000.0 * pow(color.y / 1000.0, -0.2 / 1.2);
- }
- )__SHADER__";
- break;
- default:
- fs << R"__SHADER__(
- highp vec3 NormalizeLuminance(color) {
- return color / displayMaxLuminance;
- }
- )__SHADER__";
- break;
- }
-
- if (needs.getInputTF() == needs.getOutputTF() ||
- (needs.getInputTF() == Key::INPUT_TF_LINEAR &&
- needs.getOutputTF() == Key::OUTPUT_TF_SRGB) ||
- (needs.getInputTF() == Key::INPUT_TF_SRGB &&
- needs.getOutputTF() == Key::OUTPUT_TF_LINEAR)) {
- fs << R"__SHADER__(
- highp vec3 OOTF(const highp vec3 color) {
- return color;
- }
- )__SHADER__";
- } else {
- fs << R"__SHADER__(
- highp vec3 OOTF(const highp vec3 color) {
- return NormalizeLuminance(ToneMap(ScaleLuminance(color)));
- }
- )__SHADER__";
- }
}
// Generate OETF that converts relative display light to signal values,
generated by cgit v1.2.3-59-g8ed1b (git 2.39.0) at 2025-12-10 12:48:30 +0000