From: fmalita <fmalita@chromium.org>
Date: Tue, 9 Feb 2016 16:20:18 +0000 (-0800)
Subject: Relocate anisotropic mipmap logic to SkMipMap::extractLevel()
X-Git-Tag: accepted/tizen/5.0/unified/20181102.025319~129^2~2152
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=33ed3ad9f62b3c84d439b92ab45732d4fa6d05ad;p=platform%2Fupstream%2FlibSkiaSharp.git

Relocate anisotropic mipmap logic to SkMipMap::extractLevel()

Pass a full x/y scale and defer the anisotropic heuristic to SkMipMap.

R=reed@google.com
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1686563002

Review URL: https://codereview.chromium.org/1686563002
---

diff --git a/gm/showmiplevels.cpp b/gm/showmiplevels.cpp
index 7fc40ce..27d47e5 100644
--- a/gm/showmiplevels.cpp
+++ b/gm/showmiplevels.cpp
@@ -150,7 +150,7 @@ protected:
         int index = 0;
         SkMipMap::Level level;
         SkScalar scale = 0.5f;
-        while (mm->extractLevel(scale, &level)) {
+        while (mm->extractLevel(SkSize::Make(scale, scale), &level)) {
             SkBitmap bm = func(prevPM, level.fPixmap);
             DrawAndFrame(canvas, bm, x, y);
 
@@ -258,7 +258,7 @@ protected:
         int index = 0;
         SkMipMap::Level level;
         SkScalar scale = 0.5f;
-        while (mm->extractLevel(scale, &level)) {
+        while (mm->extractLevel(SkSize::Make(scale, scale), &level)) {
             SkBitmap bm;
             bm.installPixels(level.fPixmap);
             DrawAndFrame(canvas, bm, x, y);
diff --git a/src/core/SkBitmapController.cpp b/src/core/SkBitmapController.cpp
index b21c0f2..0555947 100644
--- a/src/core/SkBitmapController.cpp
+++ b/src/core/SkBitmapController.cpp
@@ -165,11 +165,7 @@ bool SkDefaultBitmapControllerState::processMediumRequest(const SkBitmapProvider
         return false;
     }
 
-    // Use the smallest (non-inverse) scale to match the GPU impl.
-    SkASSERT(invScaleSize.width() >= 0 && invScaleSize.height() >= 0);
-    const SkScalar invScale = SkTMax(invScaleSize.width(), invScaleSize.height());
-
-    if (invScale > SK_Scalar1) {
+    if (invScaleSize.width() > SK_Scalar1 || invScaleSize.height() > SK_Scalar1) {
         fCurrMip.reset(SkMipMapCache::FindAndRef(provider.makeCacheDesc()));
         if (nullptr == fCurrMip.get()) {
             SkBitmap orig;
@@ -186,9 +182,10 @@ bool SkDefaultBitmapControllerState::processMediumRequest(const SkBitmapProvider
             sk_throw();
         }
         
-        SkScalar levelScale = SkScalarInvert(invScale);
+        const SkSize scale = SkSize::Make(SkScalarInvert(invScaleSize.width()),
+                                          SkScalarInvert(invScaleSize.height()));
         SkMipMap::Level level;
-        if (fCurrMip->extractLevel(levelScale, &level)) {
+        if (fCurrMip->extractLevel(scale, &level)) {
             const SkSize& invScaleFixup = level.fScale;
             fInvMatrix.postScale(invScaleFixup.width(), invScaleFixup.height());
 
diff --git a/src/core/SkMipMap.cpp b/src/core/SkMipMap.cpp
index 08602b7..7266dc6 100644
--- a/src/core/SkMipMap.cpp
+++ b/src/core/SkMipMap.cpp
@@ -320,11 +320,15 @@ SkMipMap* SkMipMap::Build(const SkPixmap& src, SkDiscardableFactoryProc fact) {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-bool SkMipMap::extractLevel(SkScalar scale, Level* levelPtr) const {
+bool SkMipMap::extractLevel(const SkSize& scaleSize, Level* levelPtr) const {
     if (nullptr == fLevels) {
         return false;
     }
 
+    SkASSERT(scaleSize.width() >= 0 && scaleSize.height() >= 0);
+    // Use the smallest scale to match the GPU impl.
+    const SkScalar scale = SkTMin(scaleSize.width(), scaleSize.height());
+
     if (scale >= SK_Scalar1 || scale <= 0 || !SkScalarIsFinite(scale)) {
         return false;
     }
diff --git a/src/core/SkMipMap.h b/src/core/SkMipMap.h
index bc6d154..fe2018c 100644
--- a/src/core/SkMipMap.h
+++ b/src/core/SkMipMap.h
@@ -28,7 +28,7 @@ public:
         SkSize      fScale; // < 1.0
     };
 
-    bool extractLevel(SkScalar scale, Level*) const;
+    bool extractLevel(const SkSize& scale, Level*) const;
 
 protected:
     void onDataChange(void* oldData, void* newData) override {
diff --git a/tests/MipMapTest.cpp b/tests/MipMapTest.cpp
index 11021e6..32fa34f 100644
--- a/tests/MipMapTest.cpp
+++ b/tests/MipMapTest.cpp
@@ -27,8 +27,10 @@ DEF_TEST(MipMap, reporter) {
         make_bitmap(&bm, rand);
         SkAutoTUnref<SkMipMap> mm(SkMipMap::Build(bm, nullptr));
 
-        REPORTER_ASSERT(reporter, !mm->extractLevel(SK_Scalar1, nullptr));
-        REPORTER_ASSERT(reporter, !mm->extractLevel(SK_Scalar1 * 2, nullptr));
+        REPORTER_ASSERT(reporter, !mm->extractLevel(SkSize::Make(SK_Scalar1, SK_Scalar1),
+                                                    nullptr));
+        REPORTER_ASSERT(reporter, !mm->extractLevel(SkSize::Make(SK_Scalar1 * 2, SK_Scalar1 * 2),
+                                                    nullptr));
 
         SkMipMap::Level prevLevel;
         sk_bzero(&prevLevel, sizeof(prevLevel));
@@ -38,7 +40,7 @@ DEF_TEST(MipMap, reporter) {
             scale = scale * 2 / 3;
 
             SkMipMap::Level level;
-            if (mm->extractLevel(scale, &level)) {
+            if (mm->extractLevel(SkSize::Make(scale, scale), &level)) {
                 REPORTER_ASSERT(reporter, level.fPixmap.addr());
                 REPORTER_ASSERT(reporter, level.fPixmap.width() > 0);
                 REPORTER_ASSERT(reporter, level.fPixmap.height() > 0);