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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 "chrome/common/render_messages_params.h"
#include "chrome/renderer/render_view.h"
#include "gfx/gdi_util.h"
#include "gfx/size.h"
#include "grit/generated_resources.h"
#include "printing/native_metafile.h"
#include "printing/units.h"
#include "skia/ext/vector_canvas.h"
#include "skia/ext/vector_platform_device.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
using printing::ConvertUnitDouble;
using printing::kPointsPerInch;
using WebKit::WebFrame;
using WebKit::WebString;
int CALLBACK EnhMetaFileProc(HDC dc,
HANDLETABLE* handle_table,
const ENHMETARECORD *record,
int num_objects,
LPARAM data) {
HDC* bitmap_dc = reinterpret_cast<HDC*>(data);
// Play this command to the bitmap DC.
PlayEnhMetaFileRecord(*bitmap_dc, handle_table, record, num_objects);
if (record->iType == EMR_ALPHABLEND) {
const EMRALPHABLEND* emr_alpha_blend =
reinterpret_cast<const EMRALPHABLEND*>(record);
XFORM bitmap_dc_transform, metafile_dc_transform;
XFORM identity = { 1.0f, 0.0f, 0.0f, 1.0f, 0.0f, 0.0f };
// Temporarily set the world transforms of both DC's to identity.
GetWorldTransform(dc, &metafile_dc_transform);
SetWorldTransform(dc, &identity);
GetWorldTransform(*bitmap_dc, &bitmap_dc_transform);
SetWorldTransform(*bitmap_dc, &identity);
const RECTL& rect = emr_alpha_blend->rclBounds;
// Since the printer does not support alpha blend, copy the alpha blended
// region from our (software-rendered) bitmap DC to the metafile DC.
BitBlt(dc,
rect.left,
rect.top,
rect.right - rect.left + 1,
rect.bottom - rect.top + 1,
*bitmap_dc,
rect.left,
rect.top,
SRCCOPY);
// Restore the world transforms of both DC's.
SetWorldTransform(dc, &metafile_dc_transform);
SetWorldTransform(*bitmap_dc, &bitmap_dc_transform);
} else {
// Play this command to the metafile DC.
PlayEnhMetaFileRecord(dc, handle_table, record, num_objects);
}
return 1; // Continue enumeration
}
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);
int page_number = params.page_number;
double content_width_in_points;
double content_height_in_points;
GetPageSizeAndMarginsInPoints(frame, page_number, params.params,
&content_width_in_points, &content_height_in_points, NULL, NULL, NULL,
NULL);
// Calculate the dpi adjustment.
float scale_factor = static_cast<float>(params.params.desired_dpi /
params.params.dpi);
// Since WebKit extends the page width depending on the magical |scale_factor|
// we make sure the canvas covers the worst case scenario (x2.0 currently).
// PrintContext will then set the correct clipping region.
int width = static_cast<int>(content_width_in_points *
params.params.max_shrink);
int height = static_cast<int>(content_height_in_points *
params.params.max_shrink);
#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(width, height, true);
canvas.drawARGB(255, 255, 255, 255, SkXfermode::kSrc_Mode);
float webkit_scale_factor = frame->printPage(page_number, &canvas);
if (scale_factor <= 0 || webkit_scale_factor <= 0) {
NOTREACHED() << "Printing page " << page_number << " failed.";
} else {
// Update the dpi adjustment with the "page |scale_factor|" calculated
// in webkit.
scale_factor /= webkit_scale_factor;
}
// Create a BMP v4 header that we can serialize.
BITMAPV4HEADER bitmap_header;
gfx::CreateBitmapV4Header(width, height, &bitmap_header);
const SkBitmap& src_bmp = canvas.getDevice()->accessBitmap(true);
SkAutoLockPixels src_lock(src_bmp);
int retval = StretchDIBits(hdc,
0,
0,
width, height,
0, 0,
width, height,
src_bmp.getPixels(),
reinterpret_cast<BITMAPINFO*>(&bitmap_header),
DIB_RGB_COLORS,
SRCCOPY);
DCHECK(retval != GDI_ERROR);
#else
// 100% GDI based.
skia::VectorCanvas canvas(hdc, width, height);
float webkit_scale_factor = frame->printPage(page_number, &canvas);
if (scale_factor <= 0 || webkit_scale_factor <= 0) {
NOTREACHED() << "Printing page " << page_number << " failed.";
} else {
// Update the dpi adjustment with the "page scale_factor" calculated
// in webkit.
scale_factor /= webkit_scale_factor;
}
#endif
// Done printing. Close the device context to retrieve the compiled metafile.
if (!metafile.CloseDc()) {
NOTREACHED() << "metafile failed";
}
printing::NativeMetafile* mf = &metafile;
printing::NativeMetafile metafile2;
skia::VectorPlatformDevice* platform_device =
static_cast<skia::VectorPlatformDevice*>(canvas.getDevice());
if (platform_device->alpha_blend_used() &&
!params.params.supports_alpha_blend) {
// Page used alpha blend, but printer doesn't support it. Rewrite the
// metafile and flatten out the transparency.
HDC bitmap_dc = CreateCompatibleDC(GetDC(NULL));
if (!bitmap_dc) {
NOTREACHED() << "Bitmap DC creation failed";
}
SetGraphicsMode(bitmap_dc, GM_ADVANCED);
void* bits = NULL;
BITMAPINFO hdr;
gfx::CreateBitmapHeader(width, height, &hdr.bmiHeader);
HBITMAP hbitmap = CreateDIBSection(
bitmap_dc, &hdr, DIB_RGB_COLORS, &bits, NULL, 0);
if (!hbitmap) {
NOTREACHED() << "Raster bitmap creation for printing failed";
}
HGDIOBJ old_bitmap = SelectObject(bitmap_dc, hbitmap);
RECT rect = {0, 0, width, height };
HBRUSH whiteBrush = static_cast<HBRUSH>(GetStockObject(WHITE_BRUSH));
FillRect(bitmap_dc, &rect, whiteBrush);
metafile2.CreateDc(NULL, NULL);
HDC hdc = metafile2.hdc();
DCHECK(hdc);
skia::PlatformDevice::InitializeDC(hdc);
RECT metafile_bounds = metafile.GetBounds().ToRECT();
// Process the old metafile, placing all non-AlphaBlend calls into the
// new metafile, and copying the results of all the AlphaBlend calls
// from the bitmap DC.
EnumEnhMetaFile(hdc,
metafile.emf(),
EnhMetaFileProc,
&bitmap_dc,
&metafile_bounds);
SelectObject(bitmap_dc, old_bitmap);
if (!metafile2.CloseDc()) {
NOTREACHED() << "metafile failed";
}
mf = &metafile2;
}
// Get the size of the compiled metafile.
uint32 buf_size = mf->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 = page_number;
page_params.document_cookie = params.params.document_cookie;
page_params.actual_shrink = scale_factor;
page_params.page_size = params.params.page_size;
page_params.content_area = gfx::Rect(params.params.margin_left,
params.params.margin_top, params.params.printable_size.width(),
params.params.printable_size.height());
page_params.has_visible_overlays = frame->isPageBoxVisible(page_number);
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.CreateAndMapAnonymous(buf_size)) {
// Copy the bits into shared memory.
if (mf->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;
}
mf->CloseEmf();
if (Send(new ViewHostMsg_DuplicateSection(
routing_id(),
page_params.metafile_data_handle,
&page_params.metafile_data_handle))) {
if (!is_preview_) {
Send(new ViewHostMsg_DidPrintPage(routing_id(), page_params));
}
}
}
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