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      1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef ANDROID_WEBVIEW_PUBLIC_BROWSER_DRAW_SW_H_
      6 #define ANDROID_WEBVIEW_PUBLIC_BROWSER_DRAW_SW_H_
      7 
      8 #include <jni.h>
      9 #include <stddef.h>
     10 
     11 #ifndef __cplusplus
     12 #error "Can't mix C and C++ when using jni.h"
     13 #endif
     14 
     15 class SkCanvasState;
     16 class SkPicture;
     17 
     18 static const int kAwPixelInfoVersion = 3;
     19 
     20 // Holds the information required to implement the SW draw to system canvas.
     21 struct AwPixelInfo {
     22   int version;          // The kAwPixelInfoVersion this struct was built with.
     23   SkCanvasState* state; // The externalize state in skia format.
     24   // NOTE: If you add more members, bump kAwPixelInfoVersion.
     25 };
     26 
     27 // Function that can be called to fish out the underlying native pixel data
     28 // from a Java canvas object, for optimized rendering path.
     29 // Returns the pixel info on success, which must be freed via a call to
     30 // AwReleasePixelsFunction, or NULL.
     31 typedef AwPixelInfo* (AwAccessPixelsFunction)(JNIEnv* env, jobject canvas);
     32 
     33 // Must be called to balance every *successful* call to AwAccessPixelsFunction
     34 // (i.e. that returned true).
     35 typedef void (AwReleasePixelsFunction)(AwPixelInfo* pixels);
     36 
     37 // Called to create an Android Picture object encapsulating a native SkPicture.
     38 typedef jobject (AwCreatePictureFunction)(JNIEnv* env, SkPicture* picture);
     39 
     40 // Method that returns the current Skia function.
     41 typedef void (SkiaVersionFunction)(int* major, int* minor, int* patch);
     42 
     43 // Called to verify if the Skia versions are compatible.
     44 typedef bool (AwIsSkiaVersionCompatibleFunction)(SkiaVersionFunction function);
     45 
     46 static const int kAwDrawSWFunctionTableVersion = 1;
     47 
     48 // "vtable" for the functions declared in this file. An instance must be set via
     49 // AwContents.setAwDrawSWFunctionTable
     50 struct AwDrawSWFunctionTable {
     51   int version;
     52   AwAccessPixelsFunction* access_pixels;
     53   AwReleasePixelsFunction* release_pixels;
     54 };
     55 
     56 #endif  // ANDROID_WEBVIEW_PUBLIC_BROWSER_DRAW_SW_H_
     57