Add SkSurfaceCharacterization::createResized

Change-Id: Ia98ce3cf6c0b9f9100eea9850af56048e43b8d07
Reviewed-on: https://skia-review.googlesource.com/112580
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>

gn/core.gni

@@ -430,6 +430,7 @@ skia_core_sources = [
   "$_include/core/SkString.h",
   "$_include/core/SkStrokeRec.h",
   "$_include/core/SkSurface.h",
+  "$_include/core/SkSurfaceCharacterization.h",
   "$_include/core/SkSwizzle.h",
   "$_include/core/SkTextBlob.h",
   "$_include/core/SkTime.h",
@@ -454,7 +455,6 @@ skia_core_sources = [
   "$_include/private/SkSemaphore.h",
   "$_include/private/SkShadowFlags.h",
   "$_include/private/SkSpinlock.h",
-  "$_include/private/SkSurfaceCharacterization.h",
   "$_include/private/SkTemplates.h",
   "$_include/private/SkTArray.h",
   "$_include/private/SkTDArray.h",

include/core/SkDeferredDisplayListRecorder.h

@@ -9,9 +9,9 @@
 #define SkDeferredDisplayListMaker_DEFINED
 
 #include "SkRefCnt.h"
+#include "SkSurfaceCharacterization.h"
 
 #include "../private/SkDeferredDisplayList.h"
-#include "../private/SkSurfaceCharacterization.h"
 
 class GrContext;
 

include/core/SkSurfaceCharacterization.h

@@ -54,6 +54,24 @@ public:
     SkSurfaceCharacterization(const SkSurfaceCharacterization&) = default;
     SkSurfaceCharacterization& operator=(const SkSurfaceCharacterization& other) = default;
 
+    SkSurfaceCharacterization createResized(int width, int height) const {
+        const GrCaps* caps = fContextInfo->caps();
+        if (!caps) {
+            return SkSurfaceCharacterization();
+        }
+
+        if (width <= 0 || height <= 0 ||
+            width > caps->maxRenderTargetSize() || height > caps->maxRenderTargetSize()) {
+            return SkSurfaceCharacterization();
+        }
+
+        return SkSurfaceCharacterization(fContextInfo,
+                                         fCacheMaxResourceBytes,
+                                         fOrigin, width, height, fConfig, fFSAAType, fStencilCnt,
+                                         fIsTextureable, fIsMipMapped, fColorSpace,
+                                         fSurfaceProps);
+    }
+
     GrContextThreadSafeProxy* contextInfo() const { return fContextInfo.get(); }
     sk_sp<GrContextThreadSafeProxy> refContextInfo() const { return fContextInfo; }
     size_t cacheMaxResourceBytes() const { return fCacheMaxResourceBytes; }
@@ -144,25 +162,27 @@ private:
 
 class SkSurfaceCharacterization {
 public:
-    SkSurfaceCharacterization()
-            : fWidth(0)
-            , fHeight(0)
-            , fSurfaceProps(0, kUnknown_SkPixelGeometry) {
+    SkSurfaceCharacterization() : fSurfaceProps(0, kUnknown_SkPixelGeometry) { }
+
+    SkSurfaceCharacterization createResized(int width, int height) const {
+        return *this;
     }
 
+    size_t cacheMaxResourceBytes() const { return 0; }
+
     bool isValid() const { return false; }
 
-    int width() const { return fWidth; }
-    int height() const { return fHeight; }
-    SkColorSpace* colorSpace() const { return fColorSpace.get(); }
-    sk_sp<SkColorSpace> refColorSpace() const { return fColorSpace; }
+    int width() const { return 0; }
+    int height() const { return 0; }
+    int stencilCount() const { return 0; }
+    bool isTextureable() const { return false; }
+    bool isMipMapped() const { return false; }
+    SkColorSpace* colorSpace() const { return nullptr; }
+    sk_sp<SkColorSpace> refColorSpace() const { return nullptr; }
     const SkSurfaceProps& surfaceProps()const { return fSurfaceProps; }
 
 private:
-    int                             fWidth;
-    int                             fHeight;
-    sk_sp<SkColorSpace>             fColorSpace;
-    SkSurfaceProps                  fSurfaceProps;
+    SkSurfaceProps fSurfaceProps;
 };
 
 #endif

include/gpu/GrContext.h

@@ -399,6 +399,9 @@ public:
                                   const SkSurfaceProps& surfaceProps,
                                   bool isMipMapped);
 
+    const GrCaps* caps() const { return fCaps.get(); }
+    sk_sp<const GrCaps> refCaps() const { return fCaps; }
+
 private:
     // DDL TODO: need to add unit tests for backend & maybe options
     GrContextThreadSafeProxy(sk_sp<const GrCaps> caps,

tests/DeferredDisplayListTest.cpp

@@ -313,6 +313,33 @@ DEF_GPUTEST_FOR_ALL_CONTEXTS(DDLSurfaceCharacterizationTest, reporter, ctxInfo)
         SkSurfaceCharacterization c;
         REPORTER_ASSERT(reporter, !rasterSurface->characterize(&c));
     }
+
+    // Exercise the createResized method
+    {
+        SurfaceParameters params;
+
+        sk_sp<SkSurface> s = params.make(context);
+        if (!s) {
+            return;
+        }
+
+        SkSurfaceCharacterization char0;
+        SkAssertResult(s->characterize(&char0));
+
+        // Too small
+        SkSurfaceCharacterization char1 = char0.createResized(-1, -1);
+        REPORTER_ASSERT(reporter, !char1.isValid());
+
+        // Too large
+        SkSurfaceCharacterization char2 = char0.createResized(1000000, 32);
+        REPORTER_ASSERT(reporter, !char2.isValid());
+
+        // Just right
+        SkSurfaceCharacterization char3 = char0.createResized(32, 32);
+        REPORTER_ASSERT(reporter, char3.isValid());
+        REPORTER_ASSERT(reporter, 32 == char3.width());
+        REPORTER_ASSERT(reporter, 32 == char3.height());
+    }
 }
 
 static constexpr int kSize = 8;