move SkBitmapProvider to its own file

src/core/SkBitmapProvider.cpp

+/*
+ * Copyright 2015 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkBitmapProvider.h"
+#include "SkImage_Base.h"
+#include "SkPixelRef.h"
+
+int SkBitmapProvider::width() const {
+    return fImage ? fImage->width() : fBitmap.width();
+}
+
+int SkBitmapProvider::height() const {
+    return fImage ? fImage->height() : fBitmap.height();
+}
+
+uint32_t SkBitmapProvider::getID() const {
+    return fImage ? fImage->uniqueID() : fBitmap.getGenerationID();
+}
+
+bool SkBitmapProvider::validForDrawing() const {
+    if (!fImage) {
+        if (0 == fBitmap.width() || 0 == fBitmap.height()) {
+            return false;
+        }
+        if (nullptr == fBitmap.pixelRef()) {
+            return false;   // no pixels to read
+        }
+        if (fBitmap.getTexture()) {
+            // we can handle texture (ugh) since lockPixels will perform a read-back
+            return true;
+        }
+        if (kIndex_8_SkColorType == fBitmap.colorType()) {
+            SkAutoLockPixels alp(fBitmap); // but we need to call it before getColorTable() is safe.
+            if (!fBitmap.getColorTable()) {
+                return false;
+            }
+        }
+    }
+    return true;
+}
+
+SkImageInfo SkBitmapProvider::info() const {
+    if (fImage) {
+        SkAlphaType at = fImage->isOpaque() ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
+        return SkImageInfo::MakeN32(fImage->width(), fImage->height(), at);
+    } else {
+        return fBitmap.info();
+    }
+}
+
+SkBitmapCacheDesc SkBitmapProvider::makeCacheDesc(int w, int h) const {
+    return fImage ? SkBitmapCacheDesc::Make(fImage, w, h) : SkBitmapCacheDesc::Make(fBitmap, w, h);
+}
+
+SkBitmapCacheDesc SkBitmapProvider::makeCacheDesc() const {
+    return fImage ? SkBitmapCacheDesc::Make(fImage) : SkBitmapCacheDesc::Make(fBitmap);
+}
+
+void SkBitmapProvider::notifyAddedToCache() const {
+    if (fImage) {
+        // TODO
+    } else {
+        fBitmap.pixelRef()->notifyAddedToCache();
+    }
+}
+
+bool SkBitmapProvider::asBitmap(SkBitmap* bm) const {
+    if (fImage) {
+        return as_IB(fImage)->getROPixels(bm);
+    } else {
+        *bm = fBitmap;
+        return true;
+    }
+}
+