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Factor out common code from sweep and linear.

Browse Source 
And, some file cleanup.

Change-Id: I804db924bce3b5834f6cda481315dd2da38df5ca
Reviewed-on: https://skia-review.googlesource.com/15226
Commit-Queue: Herb Derby <herb@google.com>
Reviewed-by: Mike Klein <mtklein@chromium.org>
Reviewed-by: Florin Malita <fmalita@chromium.org>
This commit is contained in:
Herb Derby 2017-05-04 14:37:13 -04:00 committed by Skia Commit-Bot
parent e7705780c9
commit b7a330ff00
8 changed files with 206 additions and 319 deletions
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151
src/effects/gradients/SkGradientShader.cpp
View File

@ -12,8 +12,8 @@
#include "SkLinearGradient.h"
#include "SkMallocPixelRef.h"
#include "SkRadialGradient.h"
#include "SkTwoPointConicalGradient.h"
#include "SkSweepGradient.h"
#include "SkTwoPointConicalGradient.h"
enum GradientSerializationFlags {
// Bits 29:31 used for various boolean flags
@ -347,6 +347,155 @@ void SkGradientShaderBase::FlipGradientColors(SkColor* colorDst, Rec* recDst,
memcpy(colorDst, colorsTemp.get(), count * sizeof(SkColor));
}
bool SkGradientShaderBase::onAppendStages(
SkRasterPipeline* pipeline, SkColorSpace* dstCS, SkArenaAlloc* alloc,
const SkMatrix& ctm, const SkPaint& paint,
const SkMatrix* localM) const
{
// Local matrix not supported currently. Remove once we have a generic RP wrapper.
if (localM || !getLocalMatrix().isIdentity()) {
return false;
}
SkMatrix matrix;
if (!ctm.invert(&matrix)) {
return false;
}
SkRasterPipeline p;
if (!this->adjustMatrixAndAppendStages(alloc, &matrix, &p)) {
return false;
}
auto* m = alloc->makeArrayDefault<float>(9);
if (matrix.asAffine(m)) {
// TODO: mapping y is not needed; split the matrix stages to save some math?
pipeline->append(SkRasterPipeline::matrix_2x3, m);
} else {
matrix.get9(m);
pipeline->append(SkRasterPipeline::matrix_perspective, m);
}
pipeline->extend(p);
const bool premulGrad = fGradFlags & SkGradientShader::kInterpolateColorsInPremul_Flag;
auto prepareColor = [premulGrad, dstCS, this](int i) {
SkColor4f c = dstCS ? to_colorspace(fOrigColors4f[i], fColorSpace.get(), dstCS)
: SkColor4f_from_SkColor(fOrigColors[i], nullptr);
return premulGrad ? c.premul()
: SkPM4f::From4f(Sk4f::Load(&c));
};
// The two-stop case with stops at 0 and 1.
if (fColorCount == 2 && fOrigPos == nullptr) {
const SkPM4f c_l = prepareColor(0),
c_r = prepareColor(1);
// See F and B below.
auto* f_and_b = alloc->makeArrayDefault<SkPM4f>(2);
f_and_b[0] = SkPM4f::From4f(c_r.to4f() - c_l.to4f());
f_and_b[1] = c_l;
pipeline->append(SkRasterPipeline::linear_gradient_2stops, f_and_b);
} else {
struct Stop { float t; SkPM4f f, b; };
struct Ctx { size_t n; Stop* stops; SkPM4f start; };
auto* ctx = alloc->make<Ctx>();
ctx->start = prepareColor(0);
// For each stop we calculate a bias B and a scale factor F, such that
// for any t between stops n and n+1, the color we want is B[n] + F[n]*t.
auto init_stop = [](float t_l, float t_r, SkPM4f c_l, SkPM4f c_r, Stop *stop) {
auto F = SkPM4f::From4f((c_r.to4f() - c_l.to4f()) / (t_r - t_l));
auto B = SkPM4f::From4f(c_l.to4f() - (F.to4f() * t_l));
*stop = {t_l, F, B};
};
if (fOrigPos == nullptr) {
// Handle evenly distributed stops.
float dt = 1.0f / (fColorCount - 1);
// In the evenly distributed case, fColorCount is the number of stops. There are no
// dummy entries.
auto* stopsArray = alloc->makeArrayDefault<Stop>(fColorCount);
float t_l = 0;
SkPM4f c_l = ctx->start;
for (int i = 0; i < fColorCount - 1; i++) {
// Use multiply instead of accumulating error using repeated addition.
float t_r = (i + 1) * dt;
SkPM4f c_r = prepareColor(i + 1);
init_stop(t_l, t_r, c_l, c_r, &stopsArray[i]);
t_l = t_r;
c_l = c_r;
}
// Force the last stop.
stopsArray[fColorCount - 1].t = 1;
stopsArray[fColorCount - 1].f = SkPM4f::From4f(Sk4f{0});
stopsArray[fColorCount - 1].b = prepareColor(fColorCount - 1);
ctx->n = fColorCount;
ctx->stops = stopsArray;
} else {
// Handle arbitrary stops.
// Remove the dummy stops inserted by SkGradientShaderBase::SkGradientShaderBase
// because they are naturally handled by the search method.
int firstStop;
int lastStop;
if (fColorCount > 2) {
firstStop = fOrigColors4f[0] != fOrigColors4f[1] ? 0 : 1;
lastStop = fOrigColors4f[fColorCount - 2] != fOrigColors4f[fColorCount - 1]
? fColorCount - 1 : fColorCount - 2;
} else {
firstStop = 0;
lastStop = 1;
}
int realCount = lastStop - firstStop + 1;
// This is the maximum number of stops. There may be fewer stops because the duplicate
// points of hard stops are removed.
auto* stopsArray = alloc->makeArrayDefault<Stop>(realCount);
size_t stopCount = 0;
float t_l = fOrigPos[firstStop];
SkPM4f c_l = prepareColor(firstStop);
// N.B. lastStop is the index of the last stop, not one after.
for (int i = firstStop; i < lastStop; i++) {
float t_r = fOrigPos[i + 1];
SkPM4f c_r = prepareColor(i + 1);
if (t_l < t_r) {
init_stop(t_l, t_r, c_l, c_r, &stopsArray[stopCount]);
stopCount += 1;
}
t_l = t_r;
c_l = c_r;
}
stopsArray[stopCount].t = fOrigPos[lastStop];
stopsArray[stopCount].f = SkPM4f::From4f(Sk4f{0});
stopsArray[stopCount].b = prepareColor(lastStop);
stopCount += 1;
ctx->n = stopCount;
ctx->stops = stopsArray;
}
pipeline->append(SkRasterPipeline::linear_gradient, ctx);
}
if (!premulGrad && !this->colorsAreOpaque()) {
pipeline->append(SkRasterPipeline::premul);
}
return true;
}
bool SkGradientShaderBase::isOpaque() const {
return fColorsAreOpaque;
}

34
src/effects/gradients/SkGradientShaderPriv.h
View File

@ -17,6 +17,8 @@
#include "SkColorPriv.h"
#include "SkColorSpace.h"
#include "SkOnce.h"
#include "SkPM4fPriv.h"
#include "SkRasterPipeline.h"
#include "SkReadBuffer.h"
#include "SkShader.h"
#include "SkUtils.h"
@ -201,28 +203,21 @@ public:
uint32_t getGradFlags() const { return fGradFlags; }
protected:
struct Rec {
SkFixed fPos; // 0...1
uint32_t fScale; // (1 << 24) / range
};
class GradientShaderBase4fContext;
SkGradientShaderBase(SkReadBuffer& );
void flatten(SkWriteBuffer&) const override;
SK_TO_STRING_OVERRIDE()
const SkMatrix fPtsToUnit;
TileMode fTileMode;
TileProc fTileProc;
uint8_t fGradFlags;
struct Rec {
SkFixed fPos; // 0...1
uint32_t fScale; // (1 << 24) / range
};
Rec* fRecs;
void commonAsAGradient(GradientInfo*, bool flipGrad = false) const;
bool onAsLuminanceColor(SkColor*) const override;
void initLinearBitmap(SkBitmap* bitmap) const;
/*
@ -236,6 +231,14 @@ protected:
SkColor* colorSrc, Rec* recSrc,
int count);
bool onAppendStages(SkRasterPipeline* pipeline, SkColorSpace* dstCS, SkArenaAlloc* alloc,
const SkMatrix& ctm, const SkPaint& paint,
const SkMatrix* localM) const final;
virtual bool adjustMatrixAndAppendStages(SkArenaAlloc* alloc,
SkMatrix* matrix,
SkRasterPipeline* p) const = 0;
template <typename T, typename... Args>
static Context* CheckedMakeContext(SkArenaAlloc* alloc, Args&&... args) {
auto* ctx = alloc->make<T>(std::forward<Args>(args)...);
@ -245,6 +248,12 @@ protected:
return ctx;
}
const SkMatrix fPtsToUnit;
TileMode fTileMode;
TileProc fTileProc;
uint8_t fGradFlags;
Rec* fRecs;
private:
enum {
kColorStorageCount = 4, // more than this many colors, and we'll use sk_malloc for the space
@ -277,6 +286,7 @@ private:
typedef SkShader INHERITED;
};
static inline int init_dither_toggle(int x, int y) {
x &= 1;
y = (y & 1) << 1;

165
src/effects/gradients/SkLinearGradient.cpp
View File

@ -83,76 +83,22 @@ SkShader::Context* SkLinearGradient::onMakeContext(
: CheckedMakeContext< LinearGradientContext>(alloc, *this, rec);
}
//
// Stages:
//
// * matrix (map dst -> grad space)
// * clamp/repeat/mirror (tiling)
// * linear_gradient_2stops (lerp c0/c1)
// * optional premul
//
bool SkLinearGradient::onAppendStages(SkRasterPipeline* p,
SkColorSpace* dstCS,
SkArenaAlloc* alloc,
const SkMatrix& ctm,
const SkPaint& paint,
const SkMatrix* localM) const {
// Local matrix not supported currently. Remove once we have a generic RP wrapper.
if (localM || !getLocalMatrix().isIdentity()) {
return false;
}
bool SkLinearGradient::adjustMatrixAndAppendStages(SkArenaAlloc* alloc,
SkMatrix* matrix,
SkRasterPipeline* p) const {
*matrix = SkMatrix::Concat(fPtsToUnit, *matrix);
// If the gradient is less than a quarter of a pixel, this falls into the
// subpixel gradient code handled on a different path.
SkVector dx = matrix->mapVector(1, 0);
if (dx.fX >= 4) { return false; }
SkMatrix dstToPts;
if (!ctm.invert(&dstToPts)) {
return false;
}
const auto dstToUnit = SkMatrix::Concat(fPtsToUnit, dstToPts);
// If the gradient is less than a quarter of a pixel, this falls into the subpixel gradient code
// handled on a different path.
SkVector dx = dstToUnit.mapVector(1, 0);
if (dx.fX >= 4) {
return false;
}
auto* m = alloc->makeArrayDefault<float>(9);
if (dstToUnit.asAffine(m)) {
// TODO: mapping y is not needed; split the matrix stages to save some math?
p->append(SkRasterPipeline::matrix_2x3, m);
} else {
dstToUnit.get9(m);
p->append(SkRasterPipeline::matrix_perspective, m);
}
// TODO: clamp/repeat/mirror const 1f stages?
auto* limit = alloc->make<float>(1.0f);
const bool premulGrad = fGradFlags & SkGradientShader::kInterpolateColorsInPremul_Flag;
auto prepareColor = [premulGrad, dstCS, this](int i) {
SkColor4f c = dstCS ? to_colorspace(fOrigColors4f[i], fColorSpace.get(), dstCS)
: SkColor4f_from_SkColor(fOrigColors[i], nullptr);
return premulGrad ? c.premul()
: SkPM4f::From4f(Sk4f::Load(&c));
};
// The two-stop case with stops at 0 and 1.
if (fColorCount == 2 && fOrigPos == nullptr) {
switch (fTileMode) {
case kClamp_TileMode: p->append(SkRasterPipeline:: clamp_x, limit); break;
case kClamp_TileMode: p->append(SkRasterPipeline::clamp_x, limit); break;
case kMirror_TileMode: p->append(SkRasterPipeline::mirror_x, limit); break;
case kRepeat_TileMode: p->append(SkRasterPipeline::repeat_x, limit); break;
}
const SkPM4f c_l = prepareColor(0),
c_r = prepareColor(1);
// See F and B below.
auto* f_and_b = alloc->makeArrayDefault<SkPM4f>(2);
f_and_b[0] = SkPM4f::From4f(c_r.to4f() - c_l.to4f());
f_and_b[1] = c_l;
p->append(SkRasterPipeline::linear_gradient_2stops, f_and_b);
} else {
switch (fTileMode) {
// The search strategy does not need clamping. It has implicit hard stops at the
@ -161,100 +107,7 @@ bool SkLinearGradient::onAppendStages(SkRasterPipeline* p,
case kMirror_TileMode: p->append(SkRasterPipeline::mirror_x, limit); break;
case kRepeat_TileMode: p->append(SkRasterPipeline::repeat_x, limit); break;
}
struct Stop { float t; SkPM4f f, b; };
struct Ctx { size_t n; Stop* stops; SkPM4f start; };
auto* ctx = alloc->make<Ctx>();
ctx->start = prepareColor(0);
// For each stop we calculate a bias B and a scale factor F, such that
// for any t between stops n and n+1, the color we want is B[n] + F[n]*t.
auto init_stop = [](float t_l, float t_r, SkPM4f c_l, SkPM4f c_r, Stop *stop) {
auto F = SkPM4f::From4f((c_r.to4f() - c_l.to4f()) / (t_r - t_l));
auto B = SkPM4f::From4f(c_l.to4f() - (F.to4f() * t_l));
*stop = {t_l, F, B};
};
if (fOrigPos == nullptr) {
// Handle evenly distributed stops.
float dt = 1.0f / (fColorCount - 1);
// In the evenly distributed case, fColorCount is the number of stops. There are no
// dummy entries.
auto* stopsArray = alloc->makeArrayDefault<Stop>(fColorCount);
float t_l = 0;
SkPM4f c_l = ctx->start;
for (int i = 0; i < fColorCount - 1; i++) {
// Use multiply instead of accumulating error using repeated addition.
float t_r = (i + 1) * dt;
SkPM4f c_r = prepareColor(i + 1);
init_stop(t_l, t_r, c_l, c_r, &stopsArray[i]);
t_l = t_r;
c_l = c_r;
}
// Force the last stop.
stopsArray[fColorCount - 1].t = 1;
stopsArray[fColorCount - 1].f = SkPM4f::From4f(Sk4f{0});
stopsArray[fColorCount - 1].b = prepareColor(fColorCount - 1);
ctx->n = fColorCount;
ctx->stops = stopsArray;
} else {
// Handle arbitrary stops.
// Remove the dummy stops inserted by SkGradientShaderBase::SkGradientShaderBase
// because they are naturally handled by the search method.
int firstStop;
int lastStop;
if (fColorCount > 2) {
firstStop = fOrigColors4f[0] != fOrigColors4f[1] ? 0 : 1;
lastStop = fOrigColors4f[fColorCount - 2] != fOrigColors4f[fColorCount - 1]
? fColorCount - 1 : fColorCount - 2;
} else {
firstStop = 0;
lastStop = 1;
}
int realCount = lastStop - firstStop + 1;
// This is the maximum number of stops. There may be fewer stops because the duplicate
// points of hard stops are removed.
auto* stopsArray = alloc->makeArrayDefault<Stop>(realCount);
size_t stopCount = 0;
float t_l = fOrigPos[firstStop];
SkPM4f c_l = prepareColor(firstStop);
// N.B. lastStop is the index of the last stop, not one after.
for (int i = firstStop; i < lastStop; i++) {
float t_r = fOrigPos[i + 1];
SkPM4f c_r = prepareColor(i + 1);
if (t_l < t_r) {
init_stop(t_l, t_r, c_l, c_r, &stopsArray[stopCount]);
stopCount += 1;
}
t_l = t_r;
c_l = c_r;
}
stopsArray[stopCount].t = fOrigPos[lastStop];
stopsArray[stopCount].f = SkPM4f::From4f(Sk4f{0});
stopsArray[stopCount].b = prepareColor(lastStop);
stopCount += 1;
ctx->n = stopCount;
ctx->stops = stopsArray;
}
p->append(SkRasterPipeline::linear_gradient, ctx);
}
if (!premulGrad && !this->colorsAreOpaque()) {
p->append(SkRasterPipeline::premul);
}
return true;
}

6
src/effects/gradients/SkLinearGradient.h
View File

@ -68,8 +68,10 @@ protected:
void flatten(SkWriteBuffer& buffer) const override;
Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override;
bool onAppendStages(SkRasterPipeline*, SkColorSpace*, SkArenaAlloc*,
const SkMatrix&, const SkPaint&, const SkMatrix*) const override;
bool adjustMatrixAndAppendStages(SkArenaAlloc* alloc,
SkMatrix* matrix,
SkRasterPipeline* p) const final;
sk_sp<SkShader> onMakeColorSpace(SkColorSpaceXformer* xformer) const override;

6
src/effects/gradients/SkRadialGradient.h
View File

@ -38,6 +38,12 @@ protected:
Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override;
sk_sp<SkShader> onMakeColorSpace(SkColorSpaceXformer* xformer) const override;
bool adjustMatrixAndAppendStages(SkArenaAlloc* alloc,
SkMatrix* matrix,
SkRasterPipeline* p) const final {
return false;
}
private:
const SkPoint fCenter;
const SkScalar fRadius;

146
src/effects/gradients/SkSweepGradient.cpp
View File

@ -311,150 +311,12 @@ void SkSweepGradient::toString(SkString* str) const {
str->append(")");
}
bool SkSweepGradient::onAppendStages(SkRasterPipeline* p,
SkColorSpace* dstCS,
SkArenaAlloc* alloc,
const SkMatrix& ctm,
const SkPaint& paint,
const SkMatrix* localM) const {
// Local matrix not supported currently. Remove once we have a generic RP wrapper.
if (localM || !getLocalMatrix().isIdentity()) {
return false;
}
SkMatrix dstToSrc;
if (!ctm.invert(&dstToSrc)) {
return false;
}
const auto dstToCenter = SkMatrix::Concat(
SkMatrix::MakeTrans(-fCenter.fX, -fCenter.fY), dstToSrc);
auto* m = alloc->makeArrayDefault<float>(9);
if (dstToCenter.asAffine(m)) {
// TODO: mapping y is not needed; split the matrix stages to save some math?
p->append(SkRasterPipeline::matrix_2x3, m);
} else {
dstToCenter.get9(m);
p->append(SkRasterPipeline::matrix_perspective, m);
}
bool SkSweepGradient::adjustMatrixAndAppendStages(SkArenaAlloc* alloc,
SkMatrix* matrix,
SkRasterPipeline* p) const {
matrix->postTranslate(-fCenter.fX, -fCenter.fY);
p->append(SkRasterPipeline::xy_to_polar_unit);
const bool premulGrad = fGradFlags & SkGradientShader::kInterpolateColorsInPremul_Flag;
auto prepareColor = [premulGrad, dstCS, this](int i) {
SkColor4f c = dstCS ? to_colorspace(fOrigColors4f[i], fColorSpace.get(), dstCS)
: SkColor4f_from_SkColor(fOrigColors[i], nullptr);
return premulGrad ? c.premul()
: SkPM4f::From4f(Sk4f::Load(&c));
};
// The two-stop case with stops at 0 and 1.
if (fColorCount == 2 && fOrigPos == nullptr) {
const SkPM4f c_l = prepareColor(0),
c_r = prepareColor(1);
// See F and B below.
auto* f_and_b = alloc->makeArrayDefault<SkPM4f>(2);
f_and_b[0] = SkPM4f::From4f(c_r.to4f() - c_l.to4f());
f_and_b[1] = c_l;
p->append(SkRasterPipeline::linear_gradient_2stops, f_and_b);
} else {
struct Stop { float t; SkPM4f f, b; };
struct Ctx { size_t n; Stop* stops; SkPM4f start; };
auto* ctx = alloc->make<Ctx>();
ctx->start = prepareColor(0);
// For each stop we calculate a bias B and a scale factor F, such that
// for any t between stops n and n+1, the color we want is B[n] + F[n]*t.
auto init_stop = [](float t_l, float t_r, SkPM4f c_l, SkPM4f c_r, Stop *stop) {
auto F = SkPM4f::From4f((c_r.to4f() - c_l.to4f()) / (t_r - t_l));
auto B = SkPM4f::From4f(c_l.to4f() - (F.to4f() * t_l));
*stop = {t_l, F, B};
};
if (fOrigPos == nullptr) {
// Handle evenly distributed stops.
float dt = 1.0f / (fColorCount - 1);
// In the evenly distributed case, fColorCount is the number of stops. There are no
// dummy entries.
auto* stopsArray = alloc->makeArrayDefault<Stop>(fColorCount);
float t_l = 0;
SkPM4f c_l = ctx->start;
for (int i = 0; i < fColorCount - 1; i++) {
// Use multiply instead of accumulating error using repeated addition.
float t_r = (i + 1) * dt;
SkPM4f c_r = prepareColor(i + 1);
init_stop(t_l, t_r, c_l, c_r, &stopsArray[i]);
t_l = t_r;
c_l = c_r;
}
// Force the last stop.
stopsArray[fColorCount - 1].t = 1;
stopsArray[fColorCount - 1].f = SkPM4f::From4f(Sk4f{0});
stopsArray[fColorCount - 1].b = prepareColor(fColorCount - 1);
ctx->n = fColorCount;
ctx->stops = stopsArray;
} else {
// Handle arbitrary stops.
// Remove the dummy stops inserted by SkGradientShaderBase::SkGradientShaderBase
// because they are naturally handled by the search method.
int firstStop;
int lastStop;
if (fColorCount > 2) {
firstStop = fOrigColors4f[0] != fOrigColors4f[1] ? 0 : 1;
lastStop = fOrigColors4f[fColorCount - 2] != fOrigColors4f[fColorCount - 1]
? fColorCount - 1 : fColorCount - 2;
} else {
firstStop = 0;
lastStop = 1;
}
int realCount = lastStop - firstStop + 1;
// This is the maximum number of stops. There may be fewer stops because the duplicate
// points of hard stops are removed.
auto* stopsArray = alloc->makeArrayDefault<Stop>(realCount);
size_t stopCount = 0;
float t_l = fOrigPos[firstStop];
SkPM4f c_l = prepareColor(firstStop);
// N.B. lastStop is the index of the last stop, not one after.
for (int i = firstStop; i < lastStop; i++) {
float t_r = fOrigPos[i + 1];
SkPM4f c_r = prepareColor(i + 1);
if (t_l < t_r) {
init_stop(t_l, t_r, c_l, c_r, &stopsArray[stopCount]);
stopCount += 1;
}
t_l = t_r;
c_l = c_r;
}
stopsArray[stopCount].t = fOrigPos[lastStop];
stopsArray[stopCount].f = SkPM4f::From4f(Sk4f{0});
stopsArray[stopCount].b = prepareColor(lastStop);
stopCount += 1;
ctx->n = stopCount;
ctx->stops = stopsArray;
}
p->append(SkRasterPipeline::linear_gradient, ctx);
}
if (!premulGrad && !this->colorsAreOpaque()) {
p->append(SkRasterPipeline::premul);
}
return true;
}

6
src/effects/gradients/SkSweepGradient.h
View File

@ -38,9 +38,9 @@ protected:
Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override;
sk_sp<SkShader> onMakeColorSpace(SkColorSpaceXformer* xformer) const override;
bool onAppendStages(SkRasterPipeline* pipeline, SkColorSpace* space, SkArenaAlloc* alloc,
const SkMatrix& matrix, const SkPaint& paint,
const SkMatrix* localM) const override;
bool adjustMatrixAndAppendStages(SkArenaAlloc* alloc,
SkMatrix* matrix,
SkRasterPipeline* p) const final;
private:
const SkPoint fCenter;

5
src/effects/gradients/SkTwoPointConicalGradient.h
View File

@ -78,6 +78,11 @@ protected:
void flatten(SkWriteBuffer& buffer) const override;
Context* onMakeContext(const ContextRec&, SkArenaAlloc*) const override;
sk_sp<SkShader> onMakeColorSpace(SkColorSpaceXformer* xformer) const override;
bool adjustMatrixAndAppendStages(SkArenaAlloc* alloc,
SkMatrix* matrix,
SkRasterPipeline* p) const final {
return false;
}
private:
SkPoint fCenter1;