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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 "base/logging.h"
#include "chrome/common/render_messages.h"
#include "skia/ext/vector_canvas.h"
#include "webkit/glue/webframe.h"
void PrintWebViewHelper::Print(WebFrame* frame, bool script_initiated) {
// If still not finished with earlier print request simply ignore.
if (IsPrinting())
return;
// TODO(myhuang): Get printing parameters via IPC.
// For testing purpose, we hard-coded printing parameters here.
// The paper size is US Letter (8.5 in. by 11 in.).
// Using default margins:
// Left = 0.25 in.
// Right = 0.25 in.
// Top = 0.25 in.
// Bottom = 0.56 in.
const int kDPI = 72;
const int kWidth = (8.5-0.25-0.25) * kDPI;
const int kHeight = (11-0.25-0.56) * kDPI;
ViewMsg_Print_Params default_settings;
default_settings.printable_size = gfx::Size(kWidth, kHeight);
default_settings.dpi = kDPI;
default_settings.min_shrink = 1.25;
default_settings.max_shrink = 2.0;
default_settings.desired_dpi = kDPI;
default_settings.document_cookie = NULL;
default_settings.selection_only = false;
// Calculate the estimated page count.
PrepareFrameAndViewForPrint prep_frame_view(default_settings,
frame,
frame->GetView());
int expected_pages_count = prep_frame_view.GetExpectedPageCount();
DCHECK(expected_pages_count);
ViewMsg_PrintPage_Params page_params;
page_params.params = default_settings;
// TODO(myhuang): Get final printing settings via IPC.
// For testing purpose, we hard-coded printing settings here.
// Print the first page only.
expected_pages_count = 1;
for (int i = 0; i < expected_pages_count; ++i) {
page_params.page_number = i;
PrintPage(page_params, prep_frame_view.GetPrintCanvasSize(), frame);
}
}
void PrintWebViewHelper::PrintPage(const ViewMsg_PrintPage_Params& params,
const gfx::Size& canvas_size,
WebFrame* frame) {
// 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();
// TODO(myhuang): We now use VectorCanvas to generate a PS/PDF file for
// each page in printing. We might also need to create a metafile class
// on Linux.
skia::VectorCanvas canvas(size_x, size_y);
float webkit_shrink = frame->PrintPage(params.page_number, &canvas);
if (shrink <= 0) {
NOTREACHED() << "Printing page " << params.page_number << " failed.";
} else {
// Update the dpi adjustment with the "page shrink" calculated in webkit.
shrink /= webkit_shrink;
}
}
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