Expand pixelref to return SkImageInfo and rowbytes

src/lazy/SkBitmapFactory.cpp

+/*
+ * Copyright 2012 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "SkBitmapFactory.h"
+
+#include "SkBitmap.h"
+#include "SkData.h"
+#include "SkImageCache.h"
+#include "SkImagePriv.h"
+#include "SkLazyPixelRef.h"
+
+SkBitmapFactory::SkBitmapFactory(SkBitmapFactory::DecodeProc proc)

[scroggo, 2013/12/06 14:50:33]

Hal deleted this file, correct? 

[reed1, 2013/12/06 15:48:46]

Done.

+    : fDecodeProc(proc)
+    , fImageCache(NULL)
+    , fCacheSelector(NULL) {
+    SkASSERT(fDecodeProc != NULL);
+}
+
+SkBitmapFactory::~SkBitmapFactory() {
+    SkSafeUnref(fImageCache);
+    SkSafeUnref(fCacheSelector);
+}
+
+void SkBitmapFactory::setImageCache(SkImageCache *cache) {
+    SkRefCnt_SafeAssign(fImageCache, cache);
+    if (cache != NULL) {
+        SkSafeUnref(fCacheSelector);
+        fCacheSelector = NULL;
+    }
+}
+
+void SkBitmapFactory::setCacheSelector(CacheSelector* selector) {
+    SkRefCnt_SafeAssign(fCacheSelector, selector);
+    if (selector != NULL) {
+        SkSafeUnref(fImageCache);
+        fImageCache = NULL;
+    }
+}
+
+bool SkBitmapFactory::installPixelRef(SkData* data, SkBitmap* dst) {
+    if (NULL == data || 0 == data->size() || dst == NULL) {
+        return false;
+    }
+
+    SkImageInfo info;
+    if (!fDecodeProc(data->data(), data->size(), &info, NULL)) {
+        return false;
+    }
+
+    SkBitmap::Config config = SkImageInfoToBitmapConfig(info);
+
+    Target target;
+    // FIMXE: There will be a problem if this rowbytes is calculated differently from
+    // in SkLazyPixelRef.
+    target.fRowBytes = SkImageMinRowBytes(info);
+    dst->setConfig(config, info.fWidth, info.fHeight, target.fRowBytes, info.fAlphaType);
+
+    // fImageCache and fCacheSelector are mutually exclusive.
+    SkASSERT(NULL == fImageCache || NULL == fCacheSelector);
+
+    SkImageCache* cache = NULL == fCacheSelector ? fImageCache : fCacheSelector->selectCache(info);
+
+    if (cache != NULL) {
+        // Now set a new LazyPixelRef on dst.
+        SkAutoTUnref<SkLazyPixelRef> lazyRef(SkNEW_ARGS(SkLazyPixelRef,
+                                            (info, data, fDecodeProc, cache)));
+        dst->setPixelRef(lazyRef);
+        return true;
+    } else {
+        dst->allocPixels();
+        target.fAddr = dst->getPixels();
+        return fDecodeProc(data->data(), data->size(), &info, &target);
+    }
+}