add SkImage from encoded data
git-svn-id: http://skia.googlecode.com/svn/trunk@4845 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/image/SkImage_Codec.cpp b/src/image/SkImage_Codec.cpp
new file mode 100644
index 0000000..af7e0db
--- /dev/null
+++ b/src/image/SkImage_Codec.cpp
@@ -0,0 +1,67 @@
+/*
+ * 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 "SkImage_Base.h"
+#include "SkBitmap.h"
+#include "SkCanvas.h"
+#include "SkData.h"
+#include "../images/SkImageDecoder.h"
+
+class SkImage_Codec : public SkImage_Base {
+public:
+ static SkImage* NewEmpty();
+
+ SkImage_Codec(SkData* encodedData, int width, int height);
+ virtual ~SkImage_Codec();
+
+ virtual void onDraw(SkCanvas*, SkScalar, SkScalar, const SkPaint*) SK_OVERRIDE;
+
+private:
+ SkData* fEncodedData;
+ SkBitmap fBitmap;
+
+ typedef SkImage_Base INHERITED;
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkImage_Codec::SkImage_Codec(SkData* data, int width, int height) : INHERITED(width, height) {
+ fEncodedData = data;
+ fEncodedData->ref();
+}
+
+SkImage_Codec::~SkImage_Codec() {
+ fEncodedData->unref();
+}
+
+void SkImage_Codec::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) {
+ if (!fBitmap.pixelRef()) {
+ if (!SkImageDecoder::DecodeMemory(fEncodedData->bytes(), fEncodedData->size(),
+ &fBitmap)) {
+ return;
+ }
+ }
+ canvas->drawBitmap(fBitmap, x, y, paint);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+SkImage* SkImage::NewEncodedData(SkData* data) {
+ if (NULL == data) {
+ return NULL;
+ }
+
+ SkBitmap bitmap;
+ if (!SkImageDecoder::DecodeMemory(data->bytes(), data->size(), &bitmap,
+ SkBitmap::kNo_Config,
+ SkImageDecoder::kDecodeBounds_Mode)) {
+ return NULL;
+ }
+
+ return SkNEW_ARGS(SkImage_Codec, (data, bitmap.width(), bitmap.height()));
+}
+