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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 "chrome/gpu/gpu_backing_store_win.h"
#include "app/win_util.h"
#include "base/logging.h"
#include "chrome/common/gpu_messages.h"
#include "chrome/gpu/gpu_view_win.h"
#include "chrome/gpu/gpu_thread.h"
#include "gfx/gdi_util.h"
namespace {
// Creates a dib conforming to the height/width/section parameters passed in.
HANDLE CreateDIB(HDC dc, int width, int height, int color_depth) {
BITMAPV5HEADER hdr = {0};
ZeroMemory(&hdr, sizeof(BITMAPV5HEADER));
// These values are shared with gfx::PlatformDevice
hdr.bV5Size = sizeof(BITMAPINFOHEADER);
hdr.bV5Width = width;
hdr.bV5Height = -height; // minus means top-down bitmap
hdr.bV5Planes = 1;
hdr.bV5BitCount = color_depth;
hdr.bV5Compression = BI_RGB; // no compression
hdr.bV5SizeImage = 0;
hdr.bV5XPelsPerMeter = 1;
hdr.bV5YPelsPerMeter = 1;
hdr.bV5ClrUsed = 0;
hdr.bV5ClrImportant = 0;
void* data = NULL;
HANDLE dib = CreateDIBSection(dc, reinterpret_cast<BITMAPINFO*>(&hdr),
0, &data, NULL, 0);
DCHECK(data);
return dib;
}
void CallStretchDIBits(HDC hdc, int dest_x, int dest_y, int dest_w, int dest_h,
int src_x, int src_y, int src_w, int src_h, void* pixels,
const BITMAPINFO* bitmap_info) {
// When blitting a rectangle that touches the bottom, left corner of the
// bitmap, StretchDIBits looks at it top-down! For more details, see
// http://wiki.allegro.cc/index.php?title=StretchDIBits.
int rv;
int bitmap_h = -bitmap_info->bmiHeader.biHeight;
int bottom_up_src_y = bitmap_h - src_y - src_h;
if (bottom_up_src_y == 0 && src_x == 0 && src_h != bitmap_h) {
rv = StretchDIBits(hdc,
dest_x, dest_h + dest_y - 1, dest_w, -dest_h,
src_x, bitmap_h - src_y + 1, src_w, -src_h,
pixels, bitmap_info, DIB_RGB_COLORS, SRCCOPY);
} else {
rv = StretchDIBits(hdc,
dest_x, dest_y, dest_w, dest_h,
src_x, bottom_up_src_y, src_w, src_h,
pixels, bitmap_info, DIB_RGB_COLORS, SRCCOPY);
}
DCHECK(rv != GDI_ERROR);
}
} // namespace
GpuBackingStoreWin::GpuBackingStoreWin(GpuViewWin* view,
GpuThread* gpu_thread,
int32 routing_id,
const gfx::Size& size)
: view_(view),
gpu_thread_(gpu_thread),
routing_id_(routing_id),
size_(size) {
gpu_thread_->AddRoute(routing_id_, this);
HDC screen_dc = ::GetDC(NULL);
color_depth_ = ::GetDeviceCaps(screen_dc, BITSPIXEL);
// Color depths less than 16 bpp require a palette to be specified. Instead,
// we specify the desired color depth as 16 which lets the OS to come up
// with an approximation.
if (color_depth_ < 16)
color_depth_ = 16;
hdc_ = CreateCompatibleDC(screen_dc);
ReleaseDC(NULL, screen_dc);
}
GpuBackingStoreWin::~GpuBackingStoreWin() {
gpu_thread_->RemoveRoute(routing_id_);
DCHECK(hdc_);
if (original_bitmap_) {
SelectObject(hdc_, original_bitmap_);
}
if (backing_store_dib_) {
DeleteObject(backing_store_dib_);
backing_store_dib_ = NULL;
}
DeleteDC(hdc_);
}
void GpuBackingStoreWin::OnMessageReceived(const IPC::Message& msg) {
IPC_BEGIN_MESSAGE_MAP(GpuBackingStoreWin, msg)
IPC_MESSAGE_HANDLER(GpuMsg_PaintToBackingStore, OnPaintToBackingStore)
IPC_MESSAGE_HANDLER(GpuMsg_ScrollBackingStore, OnScrollBackingStore)
IPC_END_MESSAGE_MAP_EX()
}
void GpuBackingStoreWin::OnChannelConnected(int32 peer_pid) {
}
void GpuBackingStoreWin::OnChannelError() {
// FIXME(brettw) does this mean we aren't getting any more messages and we
// should delete outselves?
}
void GpuBackingStoreWin::OnPaintToBackingStore(
base::ProcessId source_process_id,
TransportDIB::Id id,
const gfx::Rect& bitmap_rect,
const std::vector<gfx::Rect>& copy_rects) {
HANDLE source_process_handle = OpenProcess(PROCESS_ALL_ACCESS,
FALSE, source_process_id);
CHECK(source_process_handle);
// On Windows we need to duplicate the handle from the remote process.
// See BrowserRenderProcessHost::MapTransportDIB for how to do this on other
// platforms.
HANDLE section = win_util::GetSectionFromProcess(
id.handle, source_process_handle, false /* read write */);
CHECK(section);
scoped_ptr<TransportDIB> dib(TransportDIB::Map(section));
CHECK(dib.get());
if (!backing_store_dib_) {
backing_store_dib_ = CreateDIB(hdc_, size_.width(),
size_.height(), color_depth_);
if (!backing_store_dib_) {
NOTREACHED();
// TODO(brettw): do this in such a way that we can't forget to
// send the ACK.
gpu_thread_->Send(new GpuHostMsg_PaintToBackingStore_ACK(routing_id_));
return;
}
original_bitmap_ = SelectObject(hdc_, backing_store_dib_);
}
BITMAPINFOHEADER hdr;
gfx::CreateBitmapHeader(bitmap_rect.width(), bitmap_rect.height(), &hdr);
// Account for a bitmap_rect that exceeds the bounds of our view
gfx::Rect view_rect(0, 0, size_.width(), size_.height());
for (size_t i = 0; i < copy_rects.size(); i++) {
gfx::Rect paint_rect = view_rect.Intersect(copy_rects[i]);
CallStretchDIBits(hdc_,
paint_rect.x(),
paint_rect.y(),
paint_rect.width(),
paint_rect.height(),
paint_rect.x() - bitmap_rect.x(),
paint_rect.y() - bitmap_rect.y(),
paint_rect.width(),
paint_rect.height(),
dib->memory(),
reinterpret_cast<BITMAPINFO*>(&hdr));
view_->InvalidateRect(&paint_rect.ToRECT());
}
CloseHandle(source_process_handle);
gpu_thread_->Send(new GpuHostMsg_PaintToBackingStore_ACK(routing_id_));
}
void GpuBackingStoreWin::OnScrollBackingStore(int dx, int dy,
const gfx::Rect& clip_rect,
const gfx::Size& view_size) {
RECT damaged_rect, r = clip_rect.ToRECT();
ScrollDC(hdc_, dx, dy, NULL, &r, NULL, &damaged_rect);
// TODO(darin): this doesn't work if dx and dy are both non-zero!
DCHECK(dx == 0 || dy == 0);
view_->DidScrollBackingStoreRect(dx, dy, clip_rect);
}
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