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// Copyright (c) 2006-2008 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 "chrome/browser/window_clipping_info.h"
#define DEBUG_WINDOW_CLIPPING_INFO 0
WindowClippingInfo::WindowClippingInfo(HWND aWindow,
HWND ignore_wnd) : hwnd_(aWindow),
ignore_(ignore_wnd),
rgn_(NULL) {
::GetWindowRect(hwnd_, &hwnd_rect_);
ComputeScreenClipping();
ComputeWindowsClipping();
if (rgn_) {
::OffsetRgn(rgn_, -hwnd_rect_.left, -hwnd_rect_.top);
#if DEBUG_WINDOW_CLIPPING_INFO
RECT r;
::GetRgnBox(rgn_, &r);
LOG(INFO) << "Window clip rect is (" << r.left << ", " << r.top << ", "
<< r.right << ", " << r.bottom << ")";
#endif
}
}
WindowClippingInfo::~WindowClippingInfo() {
if (rgn_) {
DeleteObject(rgn_);
}
}
HRGN WindowClippingInfo::GetClippedRegion() const {
return rgn_;
}
BOOL WindowClippingInfo::IsClipped() const {
if (rgn_ == NULL) {
return FALSE;
} else {
CRect r;
::GetRgnBox(rgn_, &r);
if (r.Width() > 0 && r.Height() > 0) {
return TRUE;
} else {
return FALSE;
}
}
}
HRGN WindowClippingInfo::CombineRegions(HRGN existing, HRGN additional) const {
if (existing == NULL) {
return additional;
} else {
HRGN new_dest = CreateRectRgn(0, 0, 0, 0);
::CombineRgn(new_dest, existing, additional, RGN_OR);
DeleteObject(existing);
DeleteObject(additional);
return new_dest;
}
}
void WindowClippingInfo::ComputeScreenClipping() {
int screen_width = GetSystemMetrics(SM_CXVIRTUALSCREEN);
int screen_height = GetSystemMetrics(SM_CYVIRTUALSCREEN);
CRect c;
if (hwnd_rect_.left < 0) {
c.left = 0;
c.right = -hwnd_rect_.left;
c.top = 0;
c.bottom = hwnd_rect_.Height();
rgn_ = CombineRegions(rgn_,
CreateRectRgn(c.left, c.top, c.right, c.bottom));
}
if (hwnd_rect_.top < 0) {
c.left = 0;
c.right = hwnd_rect_.Width();
c.top = 0;
c.bottom = -hwnd_rect_.top;
rgn_ = CombineRegions(rgn_,
CreateRectRgn(c.left, c.top, c.right, c.bottom));
}
if (hwnd_rect_.right > screen_width) {
c.left = screen_width - hwnd_rect_.left;
c.right = hwnd_rect_.right - screen_width + c.left;
c.top = 0;
c.bottom = hwnd_rect_.Height();
rgn_ = CombineRegions(rgn_,
CreateRectRgn(c.left, c.top, c.right, c.bottom));
}
if (hwnd_rect_.bottom > screen_height) {
c.left = 0;
c.right = hwnd_rect_.Width();
c.top = screen_height - hwnd_rect_.top;
c.bottom = hwnd_rect_.bottom - screen_height + c.top;
rgn_ = CombineRegions(rgn_,
CreateRectRgn(c.left, c.top, c.right, c.bottom));
}
if (rgn_) {
// Convert the region in screen coordinate system to be compatible with
// the the windows clipping regions
::OffsetRgn(rgn_, hwnd_rect_.left, hwnd_rect_.top);
#if DEBUG_WINDOW_CLIPPING_INFO
RECT cr;
::GetRgnBox(rgn_, &cr);
LOG(INFO) << "Screen Clip is (" << cr.left << ", " << cr.top << ", " <<
cr.right << ", " << cr.bottom << ")";
#endif
} else {
#if DEBUG_WINDOW_CLIPPING_INFO
LOG(INFO) << "Screen Clip is null";
#endif
}
}
// WindowEnumProc is called for every top level windows until we
// return FALSE or all top level windows have been enumerated.
//
// Windows are ordered per Z-Order with higher level windows first and
// lower level windows last.
//
//static
BOOL CALLBACK WindowClippingInfo::WindowEnumProc(HWND hwnd, LPARAM lParam) {
WindowClippingInfo* wci =
reinterpret_cast<WindowClippingInfo*>(lParam);
if (hwnd == wci->ignore_) {
return TRUE;
}
if (hwnd == wci->hwnd_) {
// We have enumerated all the windows above us so we are done
return FALSE;
}
if (::IsWindowVisible(hwnd)) {
RECT r;
::GetWindowRect(hwnd, &r);
RECT intersection;
if (::IntersectRect(&intersection, &r, &wci->hwnd_rect_)) {
HRGN rgn = CreateRectRgn(intersection.left,
intersection.top,
intersection.right,
intersection.bottom);
if (wci->rgn_ == NULL) {
wci->rgn_ = rgn;
} else {
::CombineRgn(wci->rgn_, wci->rgn_, rgn, RGN_OR);
::DeleteObject(rgn);
}
}
}
return TRUE;
}
void WindowClippingInfo::ComputeWindowsClipping() {
::EnumWindows(WindowEnumProc, reinterpret_cast<LPARAM>(this));
}
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