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// Copyright (c) 2009 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/renderer_host/backing_store.h"
#include "app/gfx/gdi_util.h"
#include "base/command_line.h"
#include "chrome/browser/renderer_host/render_widget_host.h"
#include "chrome/common/chrome_switches.h"
#include "chrome/common/transport_dib.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;
if (BackingStore::ColorManagementEnabled()) {
hdr.bV5CSType = LCS_sRGB;
hdr.bV5Intent = LCS_GM_IMAGES;
}
void* data = NULL;
HANDLE dib = CreateDIBSection(dc, reinterpret_cast<BITMAPINFO*>(&hdr),
0, &data, NULL, 0);
DCHECK(data);
return dib;
}
} // namespace
// BackingStore (Windows) ------------------------------------------------------
BackingStore::BackingStore(RenderWidgetHost* widget, const gfx::Size& size)
: render_widget_host_(widget),
size_(size),
backing_store_dib_(NULL),
original_bitmap_(NULL) {
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);
}
BackingStore::~BackingStore() {
DCHECK(hdc_);
if (original_bitmap_) {
SelectObject(hdc_, original_bitmap_);
}
if (backing_store_dib_) {
DeleteObject(backing_store_dib_);
backing_store_dib_ = NULL;
}
DeleteDC(hdc_);
}
size_t BackingStore::MemorySize() {
return size_.GetArea() * (color_depth_ / 8);
}
// static
bool BackingStore::ColorManagementEnabled() {
static bool enabled = false;
static bool checked = false;
if (!checked) {
checked = true;
const CommandLine& command = *CommandLine::ForCurrentProcess();
enabled = command.HasSwitch(switches::kEnableMonitorProfile);
}
return enabled;
}
void BackingStore::PaintRect(base::ProcessHandle process,
TransportDIB* bitmap,
const gfx::Rect& bitmap_rect) {
if (!backing_store_dib_) {
backing_store_dib_ = CreateDIB(hdc_, size_.width(),
size_.height(), color_depth_);
if (!backing_store_dib_) {
NOTREACHED();
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());
gfx::Rect paint_rect = view_rect.Intersect(bitmap_rect);
int rv = StretchDIBits(hdc_,
paint_rect.x(), paint_rect.y(),
paint_rect.width(), paint_rect.height(),
0, 0, // source x,y.
paint_rect.width(), paint_rect.height(),
bitmap->memory(),
reinterpret_cast<BITMAPINFO*>(&hdr),
DIB_RGB_COLORS, SRCCOPY);
DCHECK(rv != GDI_ERROR);
}
void BackingStore::ScrollRect(base::ProcessHandle process,
TransportDIB* bitmap,
const gfx::Rect& bitmap_rect,
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);
// We expect that damaged_rect should equal bitmap_rect.
DCHECK(gfx::Rect(damaged_rect) == bitmap_rect);
PaintRect(process, bitmap, bitmap_rect);
}
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