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      1 /*
      2  * Copyright (C) 2006 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #ifndef SkGLCanvas_DEFINED
     18 #define SkGLCanvas_DEFINED
     19 
     20 #include "SkCanvas.h"
     21 
     22 #ifdef SK_BUILD_FOR_MAC
     23     #include <OpenGL/gl.h>
     24 #elif defined(ANDROID)
     25     #include <GLES/gl.h>
     26 #endif
     27 
     28 class SkGLDevice;
     29 class SkGLClipIter;
     30 
     31 class SkGLCanvas : public SkCanvas {
     32 public:
     33     // notice, we do NOT allow the SkCanvas(bitmap) constructor, since that
     34     // does not create a SkGLDevice, which we require
     35     SkGLCanvas();
     36     virtual ~SkGLCanvas();
     37 
     38     // overrides from SkCanvas
     39 
     40     virtual bool getViewport(SkIPoint*) const;
     41     virtual bool setViewport(int width, int height);
     42 
     43     virtual SkDevice* createDevice(SkBitmap::Config, int width, int height,
     44                                    bool isOpaque, bool isForLayer);
     45 
     46     // settings for the global texture cache
     47 
     48     static size_t GetTextureCacheMaxCount();
     49     static void SetTextureCacheMaxCount(size_t count);
     50 
     51     static size_t GetTextureCacheMaxSize();
     52     static void SetTextureCacheMaxSize(size_t size);
     53 
     54     /** Call glDeleteTextures for all textures (including those for text)
     55         This should be called while the gl-context is still valid. Its purpose
     56         is to free up gl resources. Note that if a bitmap or text is drawn after
     57         this call, new caches will be created.
     58     */
     59     static void DeleteAllTextures();
     60 
     61     /** Forget all textures without calling delete (including those for text).
     62         This should be called if the gl-context has changed, and the texture
     63         IDs that have been cached are no longer valid.
     64     */
     65     static void AbandonAllTextures();
     66 
     67 private:
     68     SkIPoint fViewportSize;
     69 
     70     // need to disallow this guy
     71     virtual SkDevice* setBitmapDevice(const SkBitmap& bitmap) {
     72         sk_throw();
     73         return NULL;
     74     }
     75 
     76     typedef SkCanvas INHERITED;
     77 };
     78 
     79 #endif
     80 
     81