The Tor Browser: widget/android/AndroidGraphicBuffer.h@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  * This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #ifndef AndroidGraphicBuffer_h_

     7 #define AndroidGraphicBuffer_h_

     9 #include "gfxTypes.h"

    11 typedef void* EGLImageKHR;

    12 typedef void* EGLClientBuffer;

    14 struct nsIntRect;

    16 namespace mozilla {

    18 /**

    19  * This class allows access to Android's direct texturing mechanism. Locking

    20  * the buffer gives you a pointer you can read/write to directly. It is fully

    21  * threadsafe, but you probably really want to use the AndroidDirectTexture

    22  * class which will handle double buffering.

    23  *

    24  * In order to use the buffer in OpenGL, just call Bind() and it will attach

    25  * to whatever texture is bound to GL_TEXTURE_2D.

    26  */

    27 class AndroidGraphicBuffer

    28 {

    29 public:

    30   enum {

    31     UsageSoftwareRead = 1,

    32     UsageSoftwareWrite = 1 << 1,

    33     UsageTexture = 1 << 2,

    34     UsageTarget = 1 << 3,

    35     Usage2D = 1 << 4

    36   };

    38   AndroidGraphicBuffer(uint32_t width, uint32_t height, uint32_t usage, gfxImageFormat format);

    39   virtual ~AndroidGraphicBuffer();

    41   int Lock(uint32_t usage, unsigned char **bits);

    42   int Lock(uint32_t usage, const nsIntRect& rect, unsigned char **bits);

    43   int Unlock();

    44   bool Reallocate(uint32_t aWidth, uint32_t aHeight, gfxImageFormat aFormat);

    46   uint32_t Width() { return mWidth; }

    47   uint32_t Height() { return mHeight; }

    49   bool Bind();

    51   static bool IsBlacklisted();

    53 private:

    54   uint32_t mWidth;

    55   uint32_t mHeight;

    56   uint32_t mUsage;

    57   gfxImageFormat mFormat;

    59   bool EnsureInitialized();

    60   bool EnsureEGLImage();

    62   void DestroyBuffer();

    63   bool EnsureBufferCreated();

    65   uint32_t GetAndroidUsage(uint32_t aUsage);

    66   uint32_t GetAndroidFormat(gfxImageFormat aFormat);

    68   void *mHandle;

    69   void *mEGLImage;

    70 };

    72 } /* mozilla */

    73 #endif /* AndroidGraphicBuffer_h_ */

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