Avoid caching shadow properties in Java & HWUI.

bug: 10650594
Change-Id: I6f57df002710bb0567ed7e53fc0bfe96cfd504b8

9 files changed, 85 insertions, 99 deletions

diff --git a/libs/hwui/DeferredDisplayList.cpp b/libs/hwui/DeferredDisplayList.cpp
index 3d58964..45b6624 100644
--- a/libs/hwui/DeferredDisplayList.cpp
+++ b/libs/hwui/DeferredDisplayList.cpp
@@ -190,7 +190,7 @@ public:
 
         // Overlapping other operations is only allowed for text without shadow. For other ops,
         // multiDraw isn't guaranteed to overdraw correctly
-        if (!isTextBatch || state->mDrawModifiers.mHasShadow) {
+        if (!isTextBatch || op->hasTextShadow()) {
             if (intersects(state->mBounds)) return false;
         }
         const DeferredDisplayState* lhs = state;
diff --git a/libs/hwui/DisplayListOp.h b/libs/hwui/DisplayListOp.h
index 6dfb918..77afc97 100644
--- a/libs/hwui/DisplayListOp.h
+++ b/libs/hwui/DisplayListOp.h
@@ -183,6 +183,10 @@ public:
         return OpenGLRenderer::getAlphaDirect(mPaint);
     }
 
+    virtual bool hasTextShadow() const {
+        return false;
+    }
+
     inline float strokeWidthOutset() {
         // since anything AA stroke with less than 1.0 pixel width is drawn with an alpha-reduced
         // 1.0 stroke, treat 1.0 as minimum.
@@ -244,11 +248,11 @@ public:
 
     bool getLocalBounds(const DrawModifiers& drawModifiers, Rect& localBounds) {
         localBounds.set(mLocalBounds);
-        if (drawModifiers.mHasShadow) {
-            // TODO: inspect paint's looper directly
+        OpenGLRenderer::TextShadow textShadow;
+        if (OpenGLRenderer::getTextShadow(mPaint, &textShadow)) {
             Rect shadow(mLocalBounds);
-            shadow.translate(drawModifiers.mShadowDx, drawModifiers.mShadowDy);
-            shadow.outset(drawModifiers.mShadowRadius);
+            shadow.translate(textShadow.dx, textShadow.dx);
+            shadow.outset(textShadow.radius);
             localBounds.unionWith(shadow);
         }
         return true;
@@ -619,41 +623,6 @@ private:
     SkiaShader* mShader;
 };
 
-class ResetShadowOp : public StateOp {
-public:
-    virtual void applyState(OpenGLRenderer& renderer, int saveCount) const {
-        renderer.resetShadow();
-    }
-
-    virtual void output(int level, uint32_t logFlags) const {
-        OP_LOGS("ResetShadow");
-    }
-
-    virtual const char* name() { return "ResetShadow"; }
-};
-
-class SetupShadowOp : public StateOp {
-public:
-    SetupShadowOp(float radius, float dx, float dy, int color)
-            : mRadius(radius), mDx(dx), mDy(dy), mColor(color) {}
-
-    virtual void applyState(OpenGLRenderer& renderer, int saveCount) const {
-        renderer.setupShadow(mRadius, mDx, mDy, mColor);
-    }
-
-    virtual void output(int level, uint32_t logFlags) const {
-        OP_LOG("SetupShadow, radius %f, %f, %f, color %#x", mRadius, mDx, mDy, mColor);
-    }
-
-    virtual const char* name() { return "SetupShadow"; }
-
-private:
-    float mRadius;
-    float mDx;
-    float mDy;
-    int mColor;
-};
-
 class ResetPaintFilterOp : public StateOp {
 public:
     virtual void applyState(OpenGLRenderer& renderer, int saveCount) const {
@@ -1330,6 +1299,10 @@ public:
         OP_LOG("Draw some text, %d bytes", mBytesCount);
     }
 
+    virtual bool hasTextShadow() const {
+        return OpenGLRenderer::hasTextShadow(mPaint);
+    }
+
     virtual void onDefer(OpenGLRenderer& renderer, DeferInfo& deferInfo,
             const DeferredDisplayState& state) {
         const SkPaint* paint = getPaint(renderer);
diff --git a/libs/hwui/DisplayListRenderer.cpp b/libs/hwui/DisplayListRenderer.cpp
index e36d975..1b8eb82 100644
--- a/libs/hwui/DisplayListRenderer.cpp
+++ b/libs/hwui/DisplayListRenderer.cpp
@@ -399,16 +399,6 @@ void DisplayListRenderer::setupShader(SkiaShader* shader) {
     addStateOp(new (alloc()) SetupShaderOp(shader));
 }
 
-void DisplayListRenderer::resetShadow() {
-    addStateOp(new (alloc()) ResetShadowOp());
-    OpenGLRenderer::resetShadow();
-}
-
-void DisplayListRenderer::setupShadow(float radius, float dx, float dy, int color) {
-    addStateOp(new (alloc()) SetupShadowOp(radius, dx, dy, color));
-    OpenGLRenderer::setupShadow(radius, dx, dy, color);
-}
-
 void DisplayListRenderer::resetPaintFilter() {
     addStateOp(new (alloc()) ResetPaintFilterOp());
 }
diff --git a/libs/hwui/DisplayListRenderer.h b/libs/hwui/DisplayListRenderer.h
index 04c5a73..bd75952 100644
--- a/libs/hwui/DisplayListRenderer.h
+++ b/libs/hwui/DisplayListRenderer.h
@@ -102,9 +102,6 @@ public:
     virtual void resetShader();
     virtual void setupShader(SkiaShader* shader);
 
-    virtual void resetShadow();
-    virtual void setupShadow(float radius, float dx, float dy, int color);
-
     virtual void resetPaintFilter();
     virtual void setupPaintFilter(int clearBits, int setBits);
 
diff --git a/libs/hwui/OpenGLRenderer.cpp b/libs/hwui/OpenGLRenderer.cpp
index 95fdb04..3f2f43e 100644
--- a/libs/hwui/OpenGLRenderer.cpp
+++ b/libs/hwui/OpenGLRenderer.cpp
@@ -2694,28 +2694,32 @@ void OpenGLRenderer::drawTextShadow(const SkPaint* paint, const char* text,
         FontRenderer& fontRenderer, int alpha, float x, float y) {
     mCaches.activeTexture(0);
 
+    TextShadow textShadow;
+    if (!getTextShadow(paint, &textShadow)) {
+        LOG_ALWAYS_FATAL("failed to query shadow attributes");
+    }
+
     // NOTE: The drop shadow will not perform gamma correction
     //       if shader-based correction is enabled
     mCaches.dropShadowCache.setFontRenderer(fontRenderer);
     const ShadowTexture* shadow = mCaches.dropShadowCache.get(
-            paint, text, bytesCount, count, mDrawModifiers.mShadowRadius, positions);
+            paint, text, bytesCount, count, textShadow.radius, positions);
     // If the drop shadow exceeds the max texture size or couldn't be
     // allocated, skip drawing
     if (!shadow) return;
     const AutoTexture autoCleanup(shadow);
 
-    const float sx = x - shadow->left + mDrawModifiers.mShadowDx;
-    const float sy = y - shadow->top + mDrawModifiers.mShadowDy;
+    const float sx = x - shadow->left + textShadow.dx;
+    const float sy = y - shadow->top + textShadow.dy;
 
-    const int shadowAlpha = ((mDrawModifiers.mShadowColor >> 24) & 0xFF) * mSnapshot->alpha;
-    int shadowColor = mDrawModifiers.mShadowColor;
+    const int shadowAlpha = ((textShadow.color >> 24) & 0xFF) * mSnapshot->alpha;
     if (mDrawModifiers.mShader) {
-        shadowColor = 0xffffffff;
+        textShadow.color = SK_ColorWHITE;
     }
 
     setupDraw();
     setupDrawWithTexture(true);
-    setupDrawAlpha8Color(shadowColor, shadowAlpha < 255 ? shadowAlpha : alpha);
+    setupDrawAlpha8Color(textShadow.color, shadowAlpha < 255 ? shadowAlpha : alpha);
     setupDrawColorFilter(getColorFilter(paint));
     setupDrawShader();
     setupDrawBlending(paint, true);
@@ -2732,7 +2736,7 @@ void OpenGLRenderer::drawTextShadow(const SkPaint* paint, const char* text,
 }
 
 bool OpenGLRenderer::canSkipText(const SkPaint* paint) const {
-    float alpha = (mDrawModifiers.mHasShadow ? 1.0f : paint->getAlpha()) * mSnapshot->alpha;
+    float alpha = (hasTextShadow(paint) ? 1.0f : paint->getAlpha()) * mSnapshot->alpha;
     return alpha == 0.0f && getXfermode(paint->getXfermode()) == SkXfermode::kSrcOver_Mode;
 }
 
@@ -2764,7 +2768,7 @@ status_t OpenGLRenderer::drawPosText(const char* text, int bytesCount, int count
     SkXfermode::Mode mode;
     getAlphaAndMode(paint, &alpha, &mode);
 
-    if (CC_UNLIKELY(mDrawModifiers.mHasShadow)) {
+    if (CC_UNLIKELY(hasTextShadow(paint))) {
         drawTextShadow(paint, text, bytesCount, count, positions, fontRenderer,
                 alpha, 0.0f, 0.0f);
     }
@@ -2841,7 +2845,7 @@ status_t OpenGLRenderer::drawText(const char* text, int bytesCount, int count, f
 
     FontRenderer& fontRenderer = mCaches.fontRenderer->getFontRenderer(paint);
 
-    if (CC_UNLIKELY(mDrawModifiers.mHasShadow)) {
+    if (CC_UNLIKELY(hasTextShadow(paint))) {
         fontRenderer.setFont(paint, mat4::identity());
         drawTextShadow(paint, text, bytesCount, count, positions, fontRenderer,
                 alpha, oldX, oldY);
@@ -3062,22 +3066,6 @@ void OpenGLRenderer::setupShader(SkiaShader* shader) {
 }
 
 ///////////////////////////////////////////////////////////////////////////////
-// Drop shadow
-///////////////////////////////////////////////////////////////////////////////
-
-void OpenGLRenderer::resetShadow() {
-    mDrawModifiers.mHasShadow = false;
-}
-
-void OpenGLRenderer::setupShadow(float radius, float dx, float dy, int color) {
-    mDrawModifiers.mHasShadow = true;
-    mDrawModifiers.mShadowRadius = radius;
-    mDrawModifiers.mShadowDx = dx;
-    mDrawModifiers.mShadowDy = dy;
-    mDrawModifiers.mShadowColor = color;
-}
-
-///////////////////////////////////////////////////////////////////////////////
 // Draw filters
 ///////////////////////////////////////////////////////////////////////////////
 
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index b49d1e1..e8e9885 100644
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -29,6 +29,7 @@
 #include <SkShader.h>
 #include <SkXfermode.h>
 
+#include <utils/Blur.h>
 #include <utils/Functor.h>
 #include <utils/RefBase.h>
 #include <utils/SortedVector.h>
@@ -71,13 +72,6 @@ struct DrawModifiers {
     SkiaShader* mShader;
     float mOverrideLayerAlpha;
 
-    // Drop shadow
-    bool mHasShadow;
-    float mShadowRadius;
-    float mShadowDx;
-    float mShadowDy;
-    int mShadowColor;
-
     // Draw filters
     bool mHasDrawFilter;
     int mPaintFilterClearBits;
@@ -222,9 +216,6 @@ public:
     virtual void resetShader();
     virtual void setupShader(SkiaShader* shader);
 
-    virtual void resetShadow();
-    virtual void setupShadow(float radius, float dx, float dy, int color);
-
     virtual void resetPaintFilter();
     virtual void setupPaintFilter(int clearBits, int setBits);
 
@@ -312,6 +303,31 @@ public:
         return paint->getAlpha();
     }
 
+    struct TextShadow {
+        SkScalar radius;
+        float dx;
+        float dy;
+        SkColor color;
+    };
+
+    static inline bool getTextShadow(const SkPaint* paint, TextShadow* textShadow) {
+        SkDrawLooper::BlurShadowRec blur;
+        if (paint && paint->getLooper() && paint->getLooper()->asABlurShadow(&blur)) {
+            if (textShadow) {
+                textShadow->radius = Blur::convertSigmaToRadius(blur.fSigma);
+                textShadow->dx = blur.fOffset.fX;
+                textShadow->dy = blur.fOffset.fY;
+                textShadow->color = blur.fColor;
+            }
+            return true;
+        }
+        return false;
+    }
+
+    static inline bool hasTextShadow(const SkPaint* paint) {
+        return getTextShadow(paint, NULL);
+    }
+
     /**
      * Return the best transform to use to rasterize text given a full
      * transform matrix.
diff --git a/libs/hwui/Renderer.h b/libs/hwui/Renderer.h
index 3209a53..57db816 100644
--- a/libs/hwui/Renderer.h
+++ b/libs/hwui/Renderer.h
@@ -178,9 +178,6 @@ public:
     virtual void resetShader() = 0;
     virtual void setupShader(SkiaShader* shader) = 0;
 
-    virtual void resetShadow() = 0;
-    virtual void setupShadow(float radius, float dx, float dy, int color) = 0;
-
     virtual void resetPaintFilter() = 0;
     virtual void setupPaintFilter(int clearBits, int setBits) = 0;
 
diff --git a/libs/hwui/utils/Blur.cpp b/libs/hwui/utils/Blur.cpp
index 85d90d0..c020b40 100644
--- a/libs/hwui/utils/Blur.cpp
+++ b/libs/hwui/utils/Blur.cpp
@@ -23,6 +23,31 @@
 namespace android {
 namespace uirenderer {
 
+// This constant approximates the scaling done in the software path's
+// "high quality" mode, in SkBlurMask::Blur() (1 / sqrt(3)).
+static const float BLUR_SIGMA_SCALE = 0.57735f;
+
+float Blur::convertRadiusToSigma(float radius) {
+    return radius > 0 ? BLUR_SIGMA_SCALE * radius + 0.5f : 0.0f;
+}
+
+float Blur::convertSigmaToRadius(float sigma) {
+    return sigma > 0.5f ? (sigma - 0.5f) / BLUR_SIGMA_SCALE : 0.0f;
+}
+
+/**
+ * HWUI has used a slightly different equation than Skia to generate the value
+ * for sigma and to preserve compatibility we have kept that logic.
+ *
+ * Based on some experimental radius and sigma values we approximate the
+ * equation sigma = f(radius) as sigma = radius * 0.3  + 0.6.  The larger the
+ * radius gets, the more our gaussian blur will resemble a box blur since with
+ * large sigma the gaussian curve begins to lose its shape.
+ */
+static float legacyConvertRadiusToSigma(float radius) {
+    return radius > 0 ? 0.3f * radius + 0.6f : 0.0f;
+}
+
 void Blur::generateGaussianWeights(float* weights, int32_t radius) {
     // Compute gaussian weights for the blur
     // e is the euler's number
@@ -31,13 +56,7 @@ void Blur::generateGaussianWeights(float* weights, int32_t radius) {
     // g(x) = ( 1 / sqrt( 2 * pi ) * sigma) * e ^ ( -x^2 / 2 * sigma^2 )
     // x is of the form [-radius .. 0 .. radius]
     // and sigma varies with radius.
-    // Based on some experimental radius values and sigma's
-    // we approximately fit sigma = f(radius) as
-    // sigma = radius * 0.3  + 0.6
-    // The larger the radius gets, the more our gaussian blur
-    // will resemble a box blur since with large sigma
-    // the gaussian curve begins to lose its shape
-    float sigma = 0.3f * (float) radius + 0.6f;
+    float sigma = legacyConvertRadiusToSigma((float) radius);
 
     // Now compute the coefficints
     // We will store some redundant values to save some math during
diff --git a/libs/hwui/utils/Blur.h b/libs/hwui/utils/Blur.h
index 6c176e9..79aff65 100644
--- a/libs/hwui/utils/Blur.h
+++ b/libs/hwui/utils/Blur.h
@@ -18,12 +18,18 @@
 #define ANDROID_HWUI_BLUR_H
 
 #include <stdint.h>
+#include <cutils/compiler.h>
 
 namespace android {
 namespace uirenderer {
 
 class Blur {
 public:
+    // If radius > 0, return the corresponding sigma, else return 0
+    ANDROID_API static float convertRadiusToSigma(float radius);
+    // If sigma > 0.6, return the corresponding radius, else return 0
+    ANDROID_API static float convertSigmaToRadius(float sigma);
+
     static void generateGaussianWeights(float* weights, int32_t radius);
     static void horizontal(float* weights, int32_t radius, const uint8_t* source,
         uint8_t* dest, int32_t width, int32_t height);