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// Copyright (c) 2011 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 "printing/image.h"
#include "base/win/scoped_gdi_object.h"
#include "base/win/scoped_hdc.h"
#include "base/win/scoped_select_object.h"
#include "printing/metafile.h"
#include "skia/ext/platform_device.h"
#include "ui/gfx/gdi_util.h" // EMF support
#include "ui/gfx/rect.h"
namespace {
// A simple class which temporarily overrides system settings.
// The bitmap image rendered via the PlayEnhMetaFile() function depends on
// some system settings.
// As a workaround for such dependency, this class saves the system settings
// and changes them. This class also restore the saved settings in its
// destructor.
class DisableFontSmoothing {
public:
explicit DisableFontSmoothing() : enable_again_(false) {
BOOL enabled;
if (SystemParametersInfo(SPI_GETFONTSMOOTHING, 0, &enabled, 0) &&
enabled) {
if (SystemParametersInfo(SPI_SETFONTSMOOTHING, FALSE, NULL, 0))
enable_again_ = true;
}
}
~DisableFontSmoothing() {
if (enable_again_) {
BOOL result = SystemParametersInfo(SPI_SETFONTSMOOTHING, TRUE, NULL, 0);
DCHECK(result);
}
}
private:
bool enable_again_;
DISALLOW_COPY_AND_ASSIGN(DisableFontSmoothing);
};
} // namespace
namespace printing {
bool Image::LoadMetafile(const Metafile& metafile) {
gfx::Rect rect(metafile.GetPageBounds(1));
DisableFontSmoothing disable_in_this_scope;
// Create a temporary HDC and bitmap to retrieve the rendered data.
base::win::ScopedCreateDC hdc(::CreateCompatibleDC(NULL));
BITMAPV4HEADER hdr;
DCHECK_EQ(rect.x(), 0);
DCHECK_EQ(rect.y(), 0);
DCHECK_GE(rect.width(), 0); // Metafile could be empty.
DCHECK_GE(rect.height(), 0);
if (rect.width() < 1 || rect.height() < 1)
return false;
size_ = rect.size();
gfx::CreateBitmapV4Header(rect.width(), rect.height(), &hdr);
unsigned char* bits = NULL;
base::win::ScopedBitmap bitmap(
::CreateDIBSection(hdc, reinterpret_cast<BITMAPINFO*>(&hdr), 0,
reinterpret_cast<void**>(&bits), NULL, 0));
DCHECK(bitmap);
base::win::ScopedSelectObject select_object(hdc, bitmap);
skia::InitializeDC(hdc);
bool success = metafile.Playback(hdc, NULL);
row_length_ = size_.width() * sizeof(uint32);
size_t bytes = row_length_ * size_.height();
DCHECK(bytes);
data_.assign(bits, bits + bytes);
return success;
}
} // namespace printing
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