Add SkSpecialImage::extractSubset & NewFromPixmap

src/core/SkSpecialImage.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file
  */
 
 #include "SkCanvas.h"
 #include "SkImage_Base.h"
 #include "SkSpecialImage.h"
 #include "SkSpecialSurface.h"
 
 ///////////////////////////////////////////////////////////////////////////////
 class SkSpecialImage_Base : public SkSpecialImage {
 public:
     SkSpecialImage_Base(SkImageFilter::Proxy* proxy, const SkIRect& subset, uint32_t uniqueID)
         : INHERITED(proxy, subset, uniqueID) {
     }
     virtual ~SkSpecialImage_Base() { }
 
     virtual void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) const = 0;
 
-    virtual bool testingOnlyOnPeekPixels(SkPixmap*) const { return false; }
+    virtual bool onPeekPixels(SkPixmap*) const { return false; }
 
     virtual GrTexture* onPeekTexture() const { return nullptr; }
 
     virtual bool testingOnlyOnGetROPixels(SkBitmap*) const = 0;
 
     // Delete this entry point ASAP (see skbug.com/4965)
     virtual bool getBitmapDeprecated(SkBitmap* result) const = 0;
 
-    virtual SkSpecialSurface* onNewSurface(const SkImageInfo& info) const { return nullptr; }
+    virtual SkSpecialSurface* onNewSurface(const SkImageInfo& info) const = 0;
+
+    virtual SkSpecialImage* onExtractSubset(const SkIRect& subset) const = 0;
 
 private:
     typedef SkSpecialImage INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 static inline const SkSpecialImage_Base* as_SIB(const SkSpecialImage* image) {
     return static_cast<const SkSpecialImage_Base*>(image);
 }
 
 void SkSpecialImage::draw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) const {
     return as_SIB(this)->onDraw(canvas, x, y, paint);
 }
 
-bool SkSpecialImage::testingOnlyPeekPixels(SkPixmap* pixmap) const {
-    return as_SIB(this)->testingOnlyOnPeekPixels(pixmap);
+bool SkSpecialImage::peekPixels(SkPixmap* pixmap) const {
+    return as_SIB(this)->onPeekPixels(pixmap);
 }
 
 GrTexture* SkSpecialImage::peekTexture() const {
     return as_SIB(this)->onPeekTexture();
 }
 
 bool SkSpecialImage::testingOnlyGetROPixels(SkBitmap* result) const {
     return as_SIB(this)->testingOnlyOnGetROPixels(result);
 }
 
 SkSpecialSurface* SkSpecialImage::newSurface(const SkImageInfo& info) const {
     return as_SIB(this)->onNewSurface(info);
 }
 
+SkSpecialImage* SkSpecialImage::extractSubset(const SkIRect& subset) const {
+    return as_SIB(this)->onExtractSubset(subset);
+}
+
 #if SK_SUPPORT_GPU
 #include "SkGr.h"
 #include "SkGrPixelRef.h"
 #endif
 
 SkSpecialImage* SkSpecialImage::internal_fromBM(SkImageFilter::Proxy* proxy,
                                                 const SkBitmap& src) {
     // Need to test offset case! (see skbug.com/4967)
     if (src.getTexture()) {
         return SkSpecialImage::NewFromGpu(proxy,
                                           src.bounds(),
                                           src.getGenerationID(),
                                           src.getTexture());
     }
 
     return SkSpecialImage::NewFromRaster(proxy, src.bounds(), src);
 }
 
 bool SkSpecialImage::internal_getBM(SkBitmap* result) {
     const SkSpecialImage_Base* ib = as_SIB(this);
 
     // TODO: need to test offset case! (see skbug.com/4967)
     return ib->getBitmapDeprecated(result);
 }
 
-SkImageFilter::Proxy* SkSpecialImage::internal_getProxy() {
-    SkASSERT(fProxy);
+SkImageFilter::Proxy* SkSpecialImage::internal_getProxy() const {
     return fProxy;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 #include "SkImage.h"
 #if SK_SUPPORT_GPU
 #include "SkGrPriv.h"
 #endif
 
 class SkSpecialImage_Image : public SkSpecialImage_Base {
@@ skipping 22 matching lines @@
         return 0;
     }
 
     void onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) const override {
         SkRect dst = SkRect::MakeXYWH(x, y, this->subset().width(), this->subset().height());
 
         canvas->drawImageRect(fImage, this->subset(),
                               dst, paint, SkCanvas::kStrict_SrcRectConstraint);
     }
 
-    bool testingOnlyOnPeekPixels(SkPixmap* pixmap) const override {
+    bool onPeekPixels(SkPixmap* pixmap) const override {
         return fImage->peekPixels(pixmap);
     }
 
     GrTexture* onPeekTexture() const override { return as_IB(fImage.get())->peekTexture(); }
 
     bool getBitmapDeprecated(SkBitmap* result) const override {
 #if SK_SUPPORT_GPU
         if (GrTexture* texture = as_IB(fImage.get())->peekTexture()) {
             const SkImageInfo info = GrMakeInfoFromTexture(texture, 
                                                            fImage->width(), fImage->height(),
@@ skipping 20 matching lines @@
         if (texture) {
             GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(info);
             desc.fFlags = kRenderTarget_GrSurfaceFlag;
 
             return SkSpecialSurface::NewRenderTarget(this->proxy(), texture->getContext(), desc);
         }
 #endif
         return SkSpecialSurface::NewRaster(this->proxy(), info, nullptr);
     }
 
+    SkSpecialImage* onExtractSubset(const SkIRect& subset) const override {
+        SkAutoTUnref<SkImage> subsetImg(fImage->newSubset(subset));
+        if (!subsetImg) {
+            return nullptr;
+        }
+
+        return SkSpecialImage::NewFromImage(this->internal_getProxy(),
+                                            SkIRect::MakeWH(subset.width(), subset.height()),
+                                            subsetImg);
+    }
+
 private:
     SkAutoTUnref<const SkImage> fImage;
 
     typedef SkSpecialImage_Base INHERITED;
 };
 
 #ifdef SK_DEBUG
 static bool rect_fits(const SkIRect& rect, int width, int height) {
     if (0 == width && 0 == height) {
         SkASSERT(0 == rect.fLeft && 0 == rect.fRight && 0 == rect.fTop && 0 == rect.fBottom);
@@ skipping 24 matching lines @@
     SkSpecialImage_Raster(SkImageFilter::Proxy* proxy, const SkIRect& subset, const SkBitmap& bm)
         : INHERITED(proxy, subset, bm.getGenerationID())
         , fBitmap(bm) {
         if (bm.pixelRef() && bm.pixelRef()->isPreLocked()) {
             // we only preemptively lock if there is no chance of triggering something expensive
             // like a lazy decode or imagegenerator. PreLocked means it is flat pixels already.
             fBitmap.lockPixels();
         }
     }
 
+    SkSpecialImage_Raster(SkImageFilter::Proxy* proxy,
+                          const SkIRect& subset,
+                          const SkPixmap& pixmap,
+                          void (*releaseProc)(void* addr, void* context),
+                          void* context)
+        : INHERITED(proxy, subset, kNeedNewImageUniqueID_SpecialImage) {
+        fBitmap.installPixels(pixmap.info(), pixmap.writable_addr(),
+                              pixmap.rowBytes(), pixmap.ctable(),
+                              releaseProc, context);
+    }
+
     ~SkSpecialImage_Raster() override { }
 
     bool isOpaque() const override { return fBitmap.isOpaque(); }
 
     size_t getSize() const override { return fBitmap.getSize(); }
 
     void onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) const override {
         SkRect dst = SkRect::MakeXYWH(x, y,
                                       this->subset().width(), this->subset().height());
 
         canvas->drawBitmapRect(fBitmap, this->subset(),
                                dst, paint, SkCanvas::kStrict_SrcRectConstraint);
     }
 
-    bool testingOnlyOnPeekPixels(SkPixmap* pixmap) const override {
+    bool onPeekPixels(SkPixmap* pixmap) const override {
         const SkImageInfo info = fBitmap.info();
         if ((kUnknown_SkColorType == info.colorType()) || !fBitmap.getPixels()) {
             return false;
         }
-        const void* pixels = fBitmap.getPixels();
-        if (pixels) {
-            if (pixmap) {
-                pixmap->reset(info, pixels, fBitmap.rowBytes());
-            }
-            return true;
-        }
-        return false;
+
+        return fBitmap.peekPixels(pixmap);
     }
 
     bool getBitmapDeprecated(SkBitmap* result) const override {
         *result = fBitmap;
         return true;
     }
 
     bool testingOnlyOnGetROPixels(SkBitmap* result) const override {
         *result = fBitmap;
         return true;
     }
 
     SkSpecialSurface* onNewSurface(const SkImageInfo& info) const override {
         return SkSpecialSurface::NewRaster(this->proxy(), info, nullptr);
     }
 
+    SkSpecialImage* onExtractSubset(const SkIRect& subset) const override {
+        SkBitmap subsetBM;
+        
+        if (!fBitmap.extractSubset(&subsetBM, subset)) {
+            return nullptr;
+        }
+
+        return SkSpecialImage::NewFromRaster(this->internal_getProxy(),
+                                             SkIRect::MakeWH(subset.width(), subset.height()),
+                                             subsetBM);
+    }
+
 private:
     SkBitmap fBitmap;
 
     typedef SkSpecialImage_Base INHERITED;
 };
 
 SkSpecialImage* SkSpecialImage::NewFromRaster(SkImageFilter::Proxy* proxy,
                                               const SkIRect& subset,
                                               const SkBitmap& bm) {
     SkASSERT(nullptr == bm.getTexture());
     SkASSERT(rect_fits(subset, bm.width(), bm.height()));
     return new SkSpecialImage_Raster(proxy, subset, bm);
 }
 
+SkSpecialImage* SkSpecialImage::NewFromPixmap(SkImageFilter::Proxy* proxy,
+                                              const SkIRect& subset,
+                                              const SkPixmap& src,
+                                              void (*releaseProc)(void* addr, void* context),
+                                              void* context) {
+    return new SkSpecialImage_Raster(proxy, subset, src, releaseProc, context);
+}
+
+
 #if SK_SUPPORT_GPU
 ///////////////////////////////////////////////////////////////////////////////
 #include "GrTexture.h"
 
 class SkSpecialImage_Gpu : public SkSpecialImage_Base {
 public:                                       
     SkSpecialImage_Gpu(SkImageFilter::Proxy* proxy, const SkIRect& subset,
                        uint32_t uniqueID, GrTexture* tex, SkAlphaType at)
         : INHERITED(proxy, subset, uniqueID)
         , fTexture(SkRef(tex))
@@ skipping 24 matching lines @@
     GrTexture* onPeekTexture() const override { return fTexture; }
 
     bool getBitmapDeprecated(SkBitmap* result) const override {
         const SkImageInfo info = GrMakeInfoFromTexture(fTexture, 
                                                        this->width(), this->height(),
                                                        this->isOpaque());
         if (!result->setInfo(info)) {
             return false;
         }
 
-        result->setPixelRef(new SkGrPixelRef(info, fTexture))->unref();
+        const SkImageInfo prInfo = info.makeWH(fTexture->width(), fTexture->height());
+
+        SkAutoTUnref<SkGrPixelRef> pixelRef(new SkGrPixelRef(prInfo, fTexture));
+        result->setPixelRef(pixelRef, this->subset().fLeft, this->subset().fTop);
         return true;
     }
 
     bool testingOnlyOnGetROPixels(SkBitmap* result) const override {
 
         const SkImageInfo info = SkImageInfo::MakeN32(this->width(), 
                                                       this->height(),
                                                       this->isOpaque() ? kOpaque_SkAlphaType
                                                                        : kPremul_SkAlphaType);
         if (!result->tryAllocPixels(info)) {
             return false;
         }
 
         if (!fTexture->readPixels(0, 0, result->width(), result->height(), kSkia8888_GrPixelConfig,
                                   result->getPixels(), result->rowBytes())) {
             return false;
         }
 
         result->pixelRef()->setImmutable();
         return true;
     }
 
     SkSpecialSurface* onNewSurface(const SkImageInfo& info) const override {
         GrSurfaceDesc desc = GrImageInfoToSurfaceDesc(info);
         desc.fFlags = kRenderTarget_GrSurfaceFlag;
 
         return SkSpecialSurface::NewRenderTarget(this->proxy(), fTexture->getContext(), desc);
     }
 
+    SkSpecialImage* onExtractSubset(const SkIRect& subset) const override {
+        return SkSpecialImage::NewFromGpu(this->internal_getProxy(),
+                                          subset,
+                                          this->uniqueID(),
+                                          fTexture, 
+                                          fAlphaType);
+    }
+
 private:
     SkAutoTUnref<GrTexture> fTexture;
     const SkAlphaType       fAlphaType;
 
     typedef SkSpecialImage_Base INHERITED;
 };
 
 SkSpecialImage* SkSpecialImage::NewFromGpu(SkImageFilter::Proxy* proxy,
                                            const SkIRect& subset, 
                                            uint32_t uniqueID,
                                            GrTexture* tex,
                                            SkAlphaType at) {
     SkASSERT(rect_fits(subset, tex->width(), tex->height()));
     return new SkSpecialImage_Gpu(proxy, subset, uniqueID, tex, at);
 }
 
 #else
 
 SkSpecialImage* SkSpecialImage::NewFromGpu(SkImageFilter::Proxy* proxy,
                                            const SkIRect& subset,
                                            uint32_t uniqueID,
                                            GrTexture* tex,
                                            SkAlphaType at) {
     return nullptr;
 }
 
 #endif