add SkImage from encoded data

git-svn-id: http://skia.googlecode.com/svn/trunk@4845 2bbb7eff-a529-9590-31e7-b0007b416f81

diff --git a/gm/image.cpp b/gm/image.cpp
index 2227956..3b83c02 100644 (file)
--- a/gm/image.cpp
+++ b/gm/image.cpp
@@ -8,6 +8,31 @@
 #include "gm.h"
 #include "SkSurface.h"
 #include "SkCanvas.h"
+#include "SkStream.h"
+#include "SkData.h"
+
+static SkData* fileToData(const char path[]) {
+    SkFILEStream stream(path);
+    if (!stream.isValid()) {
+        return SkData::NewEmpty();
+    }
+    size_t size = stream.getLength();
+    void* mem = sk_malloc_throw(size);
+    stream.read(mem, size);
+    return SkData::NewFromMalloc(mem, size);
+}
+
+static void drawJpeg(SkCanvas* canvas, const SkISize& size) {
+    SkAutoDataUnref data(fileToData("/Users/mike/Downloads/skia.google.jpeg"));
+    SkImage* image = SkImage::NewEncodedData(data);
+    if (image) {
+        SkAutoCanvasRestore acr(canvas, true);
+        canvas->scale(size.width() * 1.0f / image->width(),
+                      size.height() * 1.0f / image->height());
+        image->draw(canvas,0, 0, NULL);
+        image->unref();
+    }
+}
 
 static void drawContents(SkSurface* surface, SkColor fillC) {
     SkSize size = SkSize::Make(surface->width(), surface->height());
@@ -80,6 +105,8 @@ protected:
     }
     
     virtual void onDraw(SkCanvas* canvas) {
+        drawJpeg(canvas, this->getISize());
+
         canvas->translate(10, 10);
         canvas->scale(2, 2);
 

diff --git a/src/image/SkImage_Codec.cpp b/src/image/SkImage_Codec.cpp
new file mode 100644 (file)
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()));
+}
+

diff --git a/src/image/SkImage_Codec.h b/src/image/SkImage_Codec.h
new file mode 100644 (file)
index 0000000..1f77d4e
--- /dev/null
+++ b/src/image/SkImage_Codec.h
@@ -0,0 +1,14 @@
+//
+//  SkImage_Codec.h
+//  sfnt
+//
+//  Created by Mike Reed on 7/30/12.
+//
+//
+
+#ifndef __sfnt__SkImage_Codec__
+#define __sfnt__SkImage_Codec__
+
+#include <iostream>
+
+#endif /* defined(__sfnt__SkImage_Codec__) */