The Tor Browser: gfx/skia/trunk/src/gpu/gl/win/SkNativeGLContext

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     2 /*

     3  * Copyright 2011 Google Inc.

     4  *

     5  * Use of this source code is governed by a BSD-style license that can be

     6  * found in the LICENSE file.

     7  */

     9 #include "gl/SkNativeGLContext.h"

    10 #include "SkWGL.h"

    12 #define WIN32_LEAN_AND_MEAN

    13 #include <windows.h>

    15 SkNativeGLContext::AutoContextRestore::AutoContextRestore() {

    16     fOldHGLRC = wglGetCurrentContext();

    17     fOldHDC = wglGetCurrentDC();

    18 }

    20 SkNativeGLContext::AutoContextRestore::~AutoContextRestore() {

    21     wglMakeCurrent(fOldHDC, fOldHGLRC);

    22 }

    24 ///////////////////////////////////////////////////////////////////////////////

    26 ATOM SkNativeGLContext::gWC = 0;

    28 SkNativeGLContext::SkNativeGLContext()

    29     : fWindow(NULL)

    30     , fDeviceContext(NULL)

    31     , fGlRenderContext(0) {

    32 }

    34 SkNativeGLContext::~SkNativeGLContext() {

    35     this->destroyGLContext();

    36 }

    38 void SkNativeGLContext::destroyGLContext() {

    39     if (fGlRenderContext) {

    40         wglDeleteContext(fGlRenderContext);

    41     }

    42     if (fWindow && fDeviceContext) {

    43         ReleaseDC(fWindow, fDeviceContext);

    44     }

    45     if (fWindow) {

    46         DestroyWindow(fWindow);

    47     }

    48 }

    50 const GrGLInterface* SkNativeGLContext::createGLContext() {

    51     HINSTANCE hInstance = (HINSTANCE)GetModuleHandle(NULL);

    53     if (!gWC) {

    54         WNDCLASS wc;

    55         wc.cbClsExtra = 0;

    56         wc.cbWndExtra = 0;

    57         wc.hbrBackground = NULL;

    58         wc.hCursor = LoadCursor(NULL, IDC_ARROW);

    59         wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);

    60         wc.hInstance = hInstance;

    61         wc.lpfnWndProc = (WNDPROC) DefWindowProc;

    62         wc.lpszClassName = TEXT("Griffin");

    63         wc.lpszMenuName = NULL;

    64         wc.style = CS_HREDRAW | CS_VREDRAW | CS_OWNDC;

    66         gWC = RegisterClass(&wc);

    67         if (!gWC) {

    68             SkDebugf("Could not register window class.\n");

    69             return NULL;

    70         }

    71     }

    73     if (!(fWindow = CreateWindow(TEXT("Griffin"),

    74                                  TEXT("The Invisible Man"),

    75                                  WS_OVERLAPPEDWINDOW,

    76                                  0, 0, 1, 1,

    77                                  NULL, NULL,

    78                                  hInstance, NULL))) {

    79         SkDebugf("Could not create window.\n");

    80         return NULL;

    81     }

    83     if (!(fDeviceContext = GetDC(fWindow))) {

    84         SkDebugf("Could not get device context.\n");

    85         this->destroyGLContext();

    86         return NULL;

    87     }

    89     // Requesting a Core profile would bar us from using NVPR. So we pass false.

    90     if (!(fGlRenderContext = SkCreateWGLContext(fDeviceContext, 0, false))) {

    91         SkDebugf("Could not create rendering context.\n");

    92         this->destroyGLContext();

    93         return NULL;

    94     }

    96     if (!(wglMakeCurrent(fDeviceContext, fGlRenderContext))) {

    97         SkDebugf("Could not set the context.\n");

    98         this->destroyGLContext();

    99         return NULL;

   100     }

   101     const GrGLInterface* interface = GrGLCreateNativeInterface();

   102     if (NULL == interface) {

   103         SkDebugf("Could not create GL interface.\n");

   104         this->destroyGLContext();

   105         return NULL;

   106     }

   108     return interface;

   109 }

   111 void SkNativeGLContext::makeCurrent() const {

   112     if (!wglMakeCurrent(fDeviceContext, fGlRenderContext)) {

   113         SkDebugf("Could not create rendering context.\n");

   114     }

   115 }

   117 void SkNativeGLContext::swapBuffers() const {

   118     if (!SwapBuffers(fDeviceContext)) {

   119         SkDebugf("Could not complete SwapBuffers.\n");

   120     }

   121 }

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