The Tor Browser: gfx/gl/ForceDiscreteGPUHelperCGL.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: 4 -*-

     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 ForceDiscreteGPUHelperCGL_h_

     7 #define ForceDiscreteGPUHelperCGL_h_

     9 #include <OpenGL/OpenGL.h>

    11 /** This RAII helper guarantees that we're on the discrete GPU during its lifetime.

    12  *

    13  * As long as any ForceDiscreteGPUHelperCGL object is alive, we're on the discrete GPU.

    14  */

    15 class ForceDiscreteGPUHelperCGL

    16 {

    17     CGLPixelFormatObj mPixelFormatObj;

    19 public:

    20     ForceDiscreteGPUHelperCGL()

    21     {

    22         // the code in this function is taken from Chromium, src/ui/gfx/gl/gl_context_cgl.cc, r122013

    23         // BSD-style license, (c) The Chromium Authors

    24         CGLPixelFormatAttribute attribs[1];

    25         attribs[0] = static_cast<CGLPixelFormatAttribute>(0);

    26         GLint num_pixel_formats = 0;

    27         CGLChoosePixelFormat(attribs, &mPixelFormatObj, &num_pixel_formats);

    28     }

    30     ~ForceDiscreteGPUHelperCGL()

    31     {

    32         CGLReleasePixelFormat(mPixelFormatObj);

    33     }

    34 };

    36 #endif // ForceDiscreteGPUHelperCGL_h_

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