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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/renderer/print_web_view_helper.h"
#include "app/l10n_util.h"
#include "base/logging.h"
#include "chrome/common/render_messages.h"
#include "chrome/renderer/render_view.h"
#include "gfx/size.h"
#include "grit/generated_resources.h"
#include "printing/native_metafile.h"
#include "skia/ext/vector_canvas.h"
#include "third_party/WebKit/WebKit/chromium/public/WebFrame.h"
using WebKit::WebFrame;
using WebKit::WebString;
void PrintWebViewHelper::PrintPage(const ViewMsg_PrintPage_Params& params,
const gfx::Size& canvas_size,
WebFrame* frame) {
// Generate a memory-based metafile. It will use the current screen's DPI.
printing::NativeMetafile metafile;
metafile.CreateDc(NULL, NULL);
HDC hdc = metafile.hdc();
DCHECK(hdc);
skia::PlatformDevice::InitializeDC(hdc);
// Since WebKit extends the page width depending on the magical shrink
// factor we make sure the canvas covers the worst case scenario
// (x2.0 currently). PrintContext will then set the correct clipping region.
int size_x = static_cast<int>(canvas_size.width() * params.params.max_shrink);
int size_y = static_cast<int>(canvas_size.height() *
params.params.max_shrink);
// Calculate the dpi adjustment.
float shrink = static_cast<float>(canvas_size.width()) /
params.params.printable_size.width();
#if 0
// TODO(maruel): This code is kept for testing until the 100% GDI drawing
// code is stable. maruels use this code's output as a reference when the
// GDI drawing code fails.
// Mix of Skia and GDI based.
skia::PlatformCanvas canvas(size_x, size_y, true);
canvas.drawARGB(255, 255, 255, 255, SkPorterDuff::kSrc_Mode);
float webkit_shrink = frame->PrintPage(params.page_number, &canvas);
if (shrink <= 0 || webkit_shrink <= 0) {
NOTREACHED() << "Printing page " << params.page_number << " failed.";
} else {
// Update the dpi adjustment with the "page shrink" calculated in webkit.
shrink /= webkit_shrink;
}
// Create a BMP v4 header that we can serialize.
BITMAPV4HEADER bitmap_header;
gfx::CreateBitmapV4Header(size_x, size_y, &bitmap_header);
const SkBitmap& src_bmp = canvas.getDevice()->accessBitmap(true);
SkAutoLockPixels src_lock(src_bmp);
int retval = StretchDIBits(hdc,
0,
0,
size_x, size_y,
0, 0,
size_x, size_y,
src_bmp.getPixels(),
reinterpret_cast<BITMAPINFO*>(&bitmap_header),
DIB_RGB_COLORS,
SRCCOPY);
DCHECK(retval != GDI_ERROR);
#else
// 100% GDI based.
skia::VectorCanvas canvas(hdc, size_x, size_y);
float webkit_shrink = frame->printPage(params.page_number, &canvas);
if (shrink <= 0 || webkit_shrink <= 0) {
NOTREACHED() << "Printing page " << params.page_number << " failed.";
} else {
// Update the dpi adjustment with the "page shrink" calculated in webkit.
shrink /= webkit_shrink;
}
#endif
// Done printing. Close the device context to retrieve the compiled metafile.
if (!metafile.CloseDc()) {
NOTREACHED() << "metafile failed";
}
// Get the size of the compiled metafile.
uint32 buf_size = metafile.GetDataSize();
DCHECK_GT(buf_size, 128u);
ViewHostMsg_DidPrintPage_Params page_params;
page_params.data_size = 0;
page_params.metafile_data_handle = NULL;
page_params.page_number = params.page_number;
page_params.document_cookie = params.params.document_cookie;
page_params.actual_shrink = shrink;
base::SharedMemory shared_buf;
// http://msdn2.microsoft.com/en-us/library/ms535522.aspx
// Windows 2000/XP: When a page in a spooled file exceeds approximately 350
// MB, it can fail to print and not send an error message.
if (buf_size < 350*1024*1024) {
// Allocate a shared memory buffer to hold the generated metafile data.
if (shared_buf.Create(L"", false, false, buf_size) &&
shared_buf.Map(buf_size)) {
// Copy the bits into shared memory.
if (metafile.GetData(shared_buf.memory(), buf_size)) {
page_params.metafile_data_handle = shared_buf.handle();
page_params.data_size = buf_size;
} else {
NOTREACHED() << "GetData() failed";
}
shared_buf.Unmap();
} else {
NOTREACHED() << "Buffer allocation failed";
}
} else {
NOTREACHED() << "Buffer too large: " << buf_size;
}
metafile.CloseEmf();
if (Send(new ViewHostMsg_DuplicateSection(
routing_id(),
page_params.metafile_data_handle,
&page_params.metafile_data_handle))) {
Send(new ViewHostMsg_DidPrintPage(routing_id(), page_params));
}
}
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