Temporarily readding SkGrTexturePixelRef.h/.cpp until WebKit is transitioned to SkGrPixelRef

git-svn-id: http://skia.googlecode.com/svn/trunk@4401 2bbb7eff-a529-9590-31e7-b0007b416f81

1 files changed, 180 insertions, 0 deletions

diff --git a/src/gpu/SkGrTexturePixelRef.cpp b/src/gpu/SkGrTexturePixelRef.cpp
new file mode 100644
index 0000000000..cb0343cebf
--- /dev/null
+++ b/src/gpu/SkGrTexturePixelRef.cpp
@@ -0,0 +1,180 @@
+
+/*
+ * Copyright 2010 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+
+
+#include "SkGrTexturePixelRef.h"
+#include "GrContext.h"
+#include "GrTexture.h"
+#include "SkGr.h"
+#include "SkRect.h"
+
+// since we call lockPixels recursively on fBitmap, we need a distinct mutex,
+// to avoid deadlock with the default one provided by SkPixelRef.
+SK_DECLARE_STATIC_MUTEX(gROLockPixelsPixelRefMutex);
+
+SkROLockPixelsPixelRef_Deprecated::SkROLockPixelsPixelRef_Deprecated() 
+    : INHERITED(&gROLockPixelsPixelRefMutex) {
+}
+
+SkROLockPixelsPixelRef_Deprecated::~SkROLockPixelsPixelRef_Deprecated() {
+}
+
+void* SkROLockPixelsPixelRef_Deprecated::onLockPixels(SkColorTable** ctable) {
+    if (ctable) {
+        *ctable = NULL;
+    }
+    fBitmap.reset();
+//    SkDebugf("---------- calling readpixels in support of lockpixels\n");
+    if (!this->onReadPixels(&fBitmap, NULL)) {
+        SkDebugf("SkROLockPixelsPixelRef::onLockPixels failed!\n");
+        return NULL;
+    }
+    fBitmap.lockPixels();
+    return fBitmap.getPixels();
+}
+
+void SkROLockPixelsPixelRef_Deprecated::onUnlockPixels() {
+    fBitmap.unlockPixels();
+}
+
+bool SkROLockPixelsPixelRef_Deprecated::onLockPixelsAreWritable() const {
+    return false;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+static SkGrTexturePixelRef* copyToTexturePixelRef(GrTexture* texture,
+                                                  SkBitmap::Config dstConfig) {
+    if (NULL == texture) {
+        return NULL;
+    }
+    GrContext* context = texture->getContext();
+    if (NULL == context) {
+        return NULL;
+    }
+    GrTextureDesc desc;
+
+    desc.fWidth  = texture->width();
+    desc.fHeight = texture->height();
+    desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
+    desc.fConfig = SkGr::BitmapConfig2PixelConfig(dstConfig);
+
+    GrTexture* dst = context->createUncachedTexture(desc, NULL, 0);
+    if (NULL == dst) {
+        return NULL;
+    }
+
+    context->copyTexture(texture, dst->asRenderTarget());
+    SkGrTexturePixelRef* pixelRef = new SkGrTexturePixelRef(dst);
+    GrSafeUnref(dst);
+    return pixelRef;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkGrTexturePixelRef::SkGrTexturePixelRef(GrTexture* tex) {
+    fTexture = tex;
+    GrSafeRef(tex);
+}
+
+SkGrTexturePixelRef::~SkGrTexturePixelRef() {
+    GrSafeUnref(fTexture);
+}
+
+SkGpuTexture* SkGrTexturePixelRef::getTexture() {
+    return (SkGpuTexture*)fTexture;
+}
+
+SkPixelRef* SkGrTexturePixelRef::deepCopy(SkBitmap::Config dstConfig) {
+    return copyToTexturePixelRef(fTexture, dstConfig);
+}
+
+bool SkGrTexturePixelRef::onReadPixels(SkBitmap* dst, const SkIRect* subset) {
+    if (NULL != fTexture && fTexture->isValid()) {
+        int left, top, width, height;
+        if (NULL != subset) {
+            left = subset->fLeft;
+            width = subset->width();
+            top = subset->fTop;
+            height = subset->height();
+        } else {
+            left = 0;
+            width = fTexture->width();
+            top = 0;
+            height = fTexture->height();
+        }
+        dst->setConfig(SkBitmap::kARGB_8888_Config, width, height);
+        dst->allocPixels();
+        SkAutoLockPixels al(*dst);
+        void* buffer = dst->getPixels();
+        return fTexture->readPixels(left, top, width, height,
+                                    kSkia8888_PM_GrPixelConfig,
+                                    buffer, dst->rowBytes());
+    } else {
+        return false;
+    }
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkGrRenderTargetPixelRef::SkGrRenderTargetPixelRef(GrRenderTarget* rt) {
+    fRenderTarget = rt;
+    GrSafeRef(fRenderTarget);
+}
+
+SkGrRenderTargetPixelRef::~SkGrRenderTargetPixelRef() {
+    GrSafeUnref(fRenderTarget);
+}
+
+SkGpuTexture* SkGrRenderTargetPixelRef::getTexture() { 
+    if (NULL != fRenderTarget) {
+        return (SkGpuTexture*) fRenderTarget->asTexture();
+    }
+    return NULL;
+}
+
+SkPixelRef* SkGrRenderTargetPixelRef::deepCopy(SkBitmap::Config dstConfig) {
+    if (NULL == fRenderTarget) {
+        return NULL;
+    }
+    // Note that when copying an SkGrRenderTargetPixelRef, we actually 
+    // return an SkGrTexturePixelRef instead.  This is because
+    // SkGrRenderTargetPixelRef is usually created in conjunction with
+    // GrTexture owned elsewhere (e.g., SkGpuDevice), and cannot live
+    // independently of that texture.  SkGrTexturePixelRef, on the other
+    // hand, owns its own GrTexture, and is thus self-contained.
+    return copyToTexturePixelRef(fRenderTarget->asTexture(), dstConfig);
+}
+
+bool SkGrRenderTargetPixelRef::onReadPixels(SkBitmap* dst, const SkIRect* subset) {
+    if (NULL != fRenderTarget && fRenderTarget->isValid()) {
+        int left, top, width, height;
+        if (NULL != subset) {
+            left = subset->fLeft;
+            width = subset->width();
+            top = subset->fTop;
+            height = subset->height();
+        } else {
+            left = 0;
+            width = fRenderTarget->width();
+            top = 0;
+            height = fRenderTarget->height();
+        }
+        dst->setConfig(SkBitmap::kARGB_8888_Config, width, height);
+        dst->allocPixels();
+        SkAutoLockPixels al(*dst);
+        void* buffer = dst->getPixels();
+        return fRenderTarget->readPixels(left, top, width, height,
+                                         kSkia8888_PM_GrPixelConfig,
+                                         buffer, dst->rowBytes());
+    } else {
+        return false;
+    }
+}
+