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[skottie] Add tritone layer effect support

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Generalize sksg::TintColorFilter into GradientColorfilter, to support
multiple color interpolation ranges.

Keep the two-color/single-matrix (tint) specialization, and use a table
color filter for the general case.

Change-Id: Idf42833462127c29fb69fe94337a1d1478b77dd9
Reviewed-on: https://skia-review.googlesource.com/c/194024
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
This commit is contained in:
Florin Malita 2019-02-21 18:49:19 -05:00 committed by Skia Commit-Bot
parent 30c9eda01b
commit 71c70ea13e
3 changed files with 172 additions and 50 deletions
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50
modules/skottie/src/SkottieLayerEffect.cpp
View File

@ -45,7 +45,8 @@ sk_sp<sksg::RenderNode> AttachTintLayerEffect(const skjson::ArrayValue& jprops,
return nullptr;
}
auto tint_node = sksg::TintColorFilter::Make(std::move(layer),
auto tint_node =
sksg::GradientColorFilter::Make(std::move(layer),
abuilder->attachColor(*color0_prop, ascope, "v"),
abuilder->attachColor(*color1_prop, ascope, "v"));
if (!tint_node) {
@ -60,6 +61,49 @@ sk_sp<sksg::RenderNode> AttachTintLayerEffect(const skjson::ArrayValue& jprops,
return std::move(tint_node);
}
sk_sp<sksg::RenderNode> AttachTritoneLayerEffect(const skjson::ArrayValue& jprops,
const AnimationBuilder* abuilder,
AnimatorScope* ascope,
sk_sp<sksg::RenderNode> layer) {
enum : size_t {
kHiColor_Index = 0,
kMiColor_Index = 1,
kLoColor_Index = 2,
kBlendAmount_Index = 3,
kMax_Index = kBlendAmount_Index,
};
if (jprops.size() <= kMax_Index) {
return nullptr;
}
const skjson::ObjectValue* hicolor_prop = jprops[ kHiColor_Index];
const skjson::ObjectValue* micolor_prop = jprops[ kMiColor_Index];
const skjson::ObjectValue* locolor_prop = jprops[ kLoColor_Index];
const skjson::ObjectValue* blend_prop = jprops[kBlendAmount_Index];
if (!hicolor_prop || !micolor_prop || !locolor_prop || !blend_prop) {
return nullptr;
}
auto tritone_node =
sksg::GradientColorFilter::Make(std::move(layer), {
abuilder->attachColor(*locolor_prop, ascope, "v"),
abuilder->attachColor(*micolor_prop, ascope, "v"),
abuilder->attachColor(*hicolor_prop, ascope, "v") });
if (!tritone_node) {
return nullptr;
}
abuilder->bindProperty<ScalarValue>((*blend_prop)["v"], ascope,
[tritone_node](const ScalarValue& w) {
tritone_node->setWeight((100 - w) / 100); // 100-based, inverted (!?).
});
return std::move(tritone_node);
}
sk_sp<sksg::RenderNode> AttachFillLayerEffect(const skjson::ArrayValue& jprops,
const AnimationBuilder* abuilder,
AnimatorScope* ascope,
@ -181,6 +225,7 @@ sk_sp<sksg::RenderNode> AnimationBuilder::attachLayerEffects(const skjson::Array
enum : int32_t {
kTint_Effect = 20,
kFill_Effect = 21,
kTritone_Effect = 23,
kDropShadow_Effect = 25,
};
@ -201,6 +246,9 @@ sk_sp<sksg::RenderNode> AnimationBuilder::attachLayerEffects(const skjson::Array
case kFill_Effect:
layer = AttachFillLayerEffect(*jprops, this, ascope, std::move(layer));
break;
case kTritone_Effect:
layer = AttachTritoneLayerEffect(*jprops, this, ascope, std::move(layer));
break;
case kDropShadow_Effect:
layer = AttachDropShadowLayerEffect(*jprops, this, ascope, std::move(layer));
break;

26
modules/sksg/include/SkSGColorFilter.h
View File

@ -12,6 +12,8 @@
#include "SkBlendMode.h"
#include <vector>
class SkColorFilter;
namespace sksg {
@ -62,17 +64,18 @@ private:
};
/**
* Tint color effect: maps RGB colors to the [c0,c1] gradient based on input luminance
* (while leaving the alpha channel unchanged), then mixes with the input based on weight.
* Tint/multi-tone color effect: maps RGB colors to the [C0,C1][C1,C2]..[Cn-1,Cn] gradient
* based on input luminance (where the colors are evenly distributed across the luminance domain),
* then mixes with the input based on weight. Leaves alpha unchanged.
*/
class TintColorFilter final : public ColorFilter {
class GradientColorFilter final : public ColorFilter {
public:
~TintColorFilter() override;
~GradientColorFilter() override;
static sk_sp<TintColorFilter> Make(sk_sp<RenderNode> child,
sk_sp<Color> color0,
sk_sp<Color> color1);
static sk_sp<GradientColorFilter> Make(sk_sp<RenderNode> child,
sk_sp<Color> c0, sk_sp<Color> c1);
static sk_sp<GradientColorFilter> Make(sk_sp<RenderNode> child,
std::vector<sk_sp<Color>>);
SG_ATTRIBUTE(Weight, float, fWeight)
@ -80,14 +83,13 @@ protected:
sk_sp<SkColorFilter> onRevalidateFilter() override;
private:
TintColorFilter(sk_sp<RenderNode>, sk_sp<Color>, sk_sp<Color>);
GradientColorFilter(sk_sp<RenderNode>, std::vector<sk_sp<Color>>);
const sk_sp<Color> fColor0,
fColor1;
const std::vector<sk_sp<Color>> fColors;
float fWeight = 0;
typedef ColorFilter INHERITED;
using INHERITED = ColorFilter;
};
} // namespace sksg

124
modules/sksg/src/SkSGColorFilter.cpp
View File

@ -9,6 +9,9 @@
#include "SkColorFilter.h"
#include "SkSGColor.h"
#include "SkTableColorFilter.h"
#include <cmath>
namespace sksg {
@ -57,48 +60,49 @@ sk_sp<SkColorFilter> ModeColorFilter::onRevalidateFilter() {
return SkColorFilter::MakeModeFilter(fColor->getColor(), fMode);
}
sk_sp<TintColorFilter> TintColorFilter::Make(sk_sp<RenderNode> child,
sk_sp<GradientColorFilter> GradientColorFilter::Make(sk_sp<RenderNode> child,
sk_sp<Color> c0, sk_sp<Color> c1) {
return (child && c0 && c1) ? sk_sp<TintColorFilter>(new TintColorFilter(std::move(child),
std::move(c0),
std::move(c1)))
return Make(std::move(child), { std::move(c0), std::move(c1) });
}
sk_sp<GradientColorFilter> GradientColorFilter::Make(sk_sp<RenderNode> child,
std::vector<sk_sp<Color>> colors) {
return (child && colors.size() > 1)
? sk_sp<GradientColorFilter>(new GradientColorFilter(std::move(child), std::move(colors)))
: nullptr;
}
TintColorFilter::TintColorFilter(sk_sp<RenderNode> child, sk_sp<Color> c0, sk_sp<Color> c1)
GradientColorFilter::GradientColorFilter(sk_sp<RenderNode> child, std::vector<sk_sp<Color>> colors)
: INHERITED(std::move(child))
, fColor0(std::move(c0))
, fColor1(std::move(c1)) {
this->observeInval(fColor0);
this->observeInval(fColor1);
, fColors(std::move(colors)) {
for (const auto& color : fColors) {
this->observeInval(color);
}
}
TintColorFilter::~TintColorFilter() {
this->unobserveInval(fColor0);
this->unobserveInval(fColor1);
GradientColorFilter::~GradientColorFilter() {
for (const auto& color : fColors) {
this->unobserveInval(color);
}
}
sk_sp<SkColorFilter> TintColorFilter::onRevalidateFilter() {
fColor0->revalidate(nullptr, SkMatrix::I());
fColor1->revalidate(nullptr, SkMatrix::I());
if (fWeight <= 0) {
return nullptr;
}
const auto c0 = SkColor4f::FromColor(fColor0->getColor()),
c1 = SkColor4f::FromColor(fColor1->getColor());
namespace {
// luminance coefficients
static constexpr float kR = 0.2126f,
kG = 0.7152f,
kB = 0.0722f;
sk_sp<SkColorFilter> Make2ColorGradient(const sk_sp<Color>& color0, const sk_sp<Color>& color1) {
const auto c0 = SkColor4f::FromColor(color0->getColor()),
c1 = SkColor4f::FromColor(color1->getColor());
const auto dR = c1.fR - c0.fR,
dG = c1.fG - c0.fG,
dB = c1.fB - c0.fB;
// First, we need a luminance:
// A 2-color gradient can be expressed as a color matrix (and combined with the luminance
// calculation). First, the luminance:
//
// L = [r,g,b] . [kR,kG,kB]
//
@ -132,9 +136,77 @@ sk_sp<SkColorFilter> TintColorFilter::onRevalidateFilter() {
0, 0, 0, 1, 0,
};
return SkColorFilter::MakeMixer(nullptr,
SkColorFilter::MakeMatrixFilterRowMajor255(tint_matrix),
fWeight);
return SkColorFilter::MakeMatrixFilterRowMajor255(tint_matrix);
}
sk_sp<SkColorFilter> MakeNColorGradient(const std::vector<sk_sp<Color>>& colors) {
// For N colors, we build a gradient color table.
uint8_t rTable[256], gTable[256], bTable[256];
SkASSERT(colors.size() > 2);
const auto span_count = colors.size() - 1;
size_t span_start = 0;
for (size_t i = 0; i < span_count; ++i) {
const auto span_stop = static_cast<size_t>(std::round((i + 1) * 255.0f / span_count)),
span_size = span_stop - span_start;
if (span_start > span_stop) {
// Degenerate case.
continue;
}
SkASSERT(span_stop <= 255);
// Fill the gradient in [span_start,span_stop] -> [c0,c1]
const SkColor c0 = colors[i ]->getColor(),
c1 = colors[i + 1]->getColor();
float r = SkColorGetR(c0),
g = SkColorGetG(c0),
b = SkColorGetB(c0);
const float dR = (SkColorGetR(c1) - r) / span_size,
dG = (SkColorGetG(c1) - g) / span_size,
dB = (SkColorGetB(c1) - b) / span_size;
for (size_t j = span_start; j <= span_stop; ++j) {
rTable[j] = static_cast<uint8_t>(std::round(r));
gTable[j] = static_cast<uint8_t>(std::round(g));
bTable[j] = static_cast<uint8_t>(std::round(b));
r += dR;
g += dG;
b += dB;
}
// Ensure we always advance.
span_start = span_stop + 1;
}
SkASSERT(span_start == 256);
const SkScalar luminance_matrix[] = {
kR, kG, kB, 0, 0, // r' = L
kR, kG, kB, 0, 0, // g' = L
kR, kG, kB, 0, 0, // b' = L
0, 0, 0, 1, 0, // a' = a
};
return SkTableColorFilter::MakeARGB(nullptr, rTable, gTable, bTable)
->makeComposed(SkColorFilter::MakeMatrixFilterRowMajor255(luminance_matrix));
}
} // namespace
sk_sp<SkColorFilter> GradientColorFilter::onRevalidateFilter() {
for (const auto& color : fColors) {
color->revalidate(nullptr, SkMatrix::I());
}
if (fWeight <= 0) {
return nullptr;
}
SkASSERT(fColors.size() > 1);
auto gradientCF = (fColors.size() > 2) ? MakeNColorGradient(fColors)
: Make2ColorGradient(fColors[0], fColors[1]);
return SkColorFilter::MakeMixer(nullptr, std::move(gradientCF), fWeight);
}
} // namespace sksg