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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <windows.h>
#include "chrome/common/command_buffer_messages.h"
#include "chrome/plugin/command_buffer_stub.h"
namespace {
const wchar_t* kPreviousWndProcProperty = L"CommandBufferStubPrevWndProc";
const wchar_t* kCommandBufferStubProperty = L"CommandBufferStub";
// Message handler for the GPU plugin's child window. Used to intercept
// WM_PAINT events and forward repaint notifications to the client.
LRESULT WINAPI WndProc(HWND handle,
UINT message,
WPARAM w_param,
LPARAM l_param) {
WNDPROC previous_wnd_proc = reinterpret_cast<WNDPROC>(
::GetProp(handle, kPreviousWndProcProperty));
CommandBufferStub* stub = reinterpret_cast<CommandBufferStub*>(
::GetProp(handle, kCommandBufferStubProperty));
switch (message) {
case WM_ERASEBKGND:
// Do not clear background. Avoids flickering.
return 1;
case WM_PAINT:
// Validate the whole window to prevent another WM_PAINT message.
ValidateRect(handle, NULL);
// Notify client that the window is invalid and needs to be repainted.
stub->NotifyRepaint();
return 1;
default:
return CallWindowProc(previous_wnd_proc,
handle,
message,
w_param,
l_param);
}
}
} // namespace anonymous
void CommandBufferStub::NotifyRepaint() {
Send(new CommandBufferMsg_NotifyRepaint(route_id_));
}
bool CommandBufferStub::InitializePlatformSpecific() {
// Subclass window.
WNDPROC previous_wnd_proc = reinterpret_cast<WNDPROC>(
::GetWindowLongPtr(window_, GWLP_WNDPROC));
::SetProp(window_,
kPreviousWndProcProperty,
reinterpret_cast<HANDLE>(previous_wnd_proc));
::SetWindowLongPtr(window_,
GWLP_WNDPROC,
reinterpret_cast<LONG_PTR>(WndProc));
// Record pointer to this in window.
::SetProp(window_,
kCommandBufferStubProperty,
reinterpret_cast<HANDLE>(this));
return true;
}
void CommandBufferStub::DestroyPlatformSpecific() {
// Restore window.
WNDPROC previous_wnd_proc = reinterpret_cast<WNDPROC>(
::GetProp(window_, kPreviousWndProcProperty));
::SetWindowLongPtr(window_, GWLP_WNDPROC, reinterpret_cast<LONG_PTR>(
previous_wnd_proc));
::RemoveProp(window_, kPreviousWndProcProperty);
::RemoveProp(window_, kCommandBufferStubProperty);
}
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