| // 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 "chrome/renderer/print_web_view_helper.h" |
| |
| #include "base/logging.h" |
| #include "base/process_util.h" |
| #include "chrome/common/print_messages.h" |
| #include "printing/native_metafile_factory.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" |
| #include "ui/gfx/gdi_util.h" |
| #include "ui/gfx/point.h" |
| #include "ui/gfx/rect.h" |
| #include "ui/gfx/size.h" |
| |
| using printing::ConvertUnitDouble; |
| using printing::kPointsPerInch; |
| using WebKit::WebFrame; |
| |
| namespace { |
| |
| 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 |
| } |
| |
| } // namespace |
| |
| void PrintWebViewHelper::PrintPage(const PrintMsg_PrintPage_Params& params, |
| const gfx::Size& canvas_size, |
| WebFrame* frame) { |
| // Generate a memory-based metafile. It will use the current screen's DPI. |
| // Each metafile contains a single page. |
| scoped_ptr<printing::NativeMetafile> metafile( |
| printing::NativeMetafileFactory::Create()); |
| DCHECK(metafile->context()); |
| skia::PlatformDevice::InitializeDC(metafile->context()); |
| |
| int page_number = params.page_number; |
| |
| // Calculate the dpi adjustment. |
| float scale_factor = static_cast<float>(params.params.desired_dpi / |
| params.params.dpi); |
| |
| // Render page for printing. |
| RenderPage(params.params, &scale_factor, page_number, frame, &metafile); |
| |
| // Close the device context to retrieve the compiled metafile. |
| if (!metafile->FinishDocument()) |
| NOTREACHED(); |
| |
| // Get the size of the compiled metafile. |
| uint32 buf_size = metafile->GetDataSize(); |
| DCHECK_GT(buf_size, 128u); |
| |
| PrintHostMsg_DidPrintPage_Params page_params; |
| page_params.data_size = buf_size; |
| 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); |
| |
| if (!CopyMetafileDataToSharedMem(metafile.get(), |
| &(page_params.metafile_data_handle))) { |
| page_params.data_size = 0; |
| } |
| if (!Send(new PrintHostMsg_DuplicateSection( |
| routing_id(), |
| page_params.metafile_data_handle, |
| &page_params.metafile_data_handle))) { |
| NOTREACHED() << "Send message failed."; |
| } |
| Send(new PrintHostMsg_DidPrintPage(routing_id(), page_params)); |
| } |
| |
| void PrintWebViewHelper::CreatePreviewDocument( |
| const PrintMsg_PrintPages_Params& params, WebKit::WebFrame* frame, |
| WebKit::WebNode* node) { |
| int page_count = 0; |
| PrintMsg_Print_Params print_params = params.params; |
| UpdatePrintableSizeInPrintParameters(frame, node, &print_params); |
| PrepareFrameAndViewForPrint prep_frame_view(print_params, frame, node, |
| frame->view()); |
| page_count = prep_frame_view.GetExpectedPageCount(); |
| if (!page_count) |
| return; |
| |
| // NOTE: This is an enhanced-format metafile(EMF) which has an appearance of |
| // single page metafile. For print preview, we need a metafile with multiple |
| // pages. |
| // TODO(kmadhusu): Use a PDF metafile to support multiple pages. After "Skia |
| // PDF backend" work is completed for windows, make changes to replace this |
| // EMF with PDF metafile. |
| // http://code.google.com/p/chromium/issues/detail?id=62889 |
| scoped_ptr<printing::NativeMetafile> metafile( |
| printing::NativeMetafileFactory::Create()); |
| DCHECK(metafile->context()); |
| skia::PlatformDevice::InitializeDC(metafile->context()); |
| |
| // Calculate the dpi adjustment. |
| float shrink = static_cast<float>(params.params.desired_dpi / |
| params.params.dpi); |
| |
| if (params.pages.empty()) { |
| for (int i = 0; i < page_count; ++i) { |
| float scale_factor = shrink; |
| RenderPage(params.params, &scale_factor, i, frame, &metafile); |
| } |
| } else { |
| for (size_t i = 0; i < params.pages.size(); ++i) { |
| if (params.pages[i] >= page_count) |
| break; |
| float scale_factor = shrink; |
| RenderPage(params.params, &scale_factor, |
| static_cast<int>(params.pages[i]), frame, &metafile); |
| } |
| } |
| |
| // Close the device context to retrieve the compiled metafile. |
| if (!metafile->FinishDocument()) |
| NOTREACHED(); |
| |
| // Get the size of the compiled metafile. |
| uint32 buf_size = metafile->GetDataSize(); |
| DCHECK_GT(buf_size, 128u); |
| |
| PrintHostMsg_DidPreviewDocument_Params preview_params; |
| preview_params.document_cookie = params.params.document_cookie; |
| preview_params.data_size = buf_size; |
| preview_params.metafile_data_handle = NULL; |
| preview_params.expected_pages_count = page_count; |
| |
| if (!CopyMetafileDataToSharedMem(metafile.get(), |
| &(preview_params.metafile_data_handle))) { |
| preview_params.data_size = 0; |
| preview_params.expected_pages_count = 0; |
| } |
| if (!Send(new PrintHostMsg_DuplicateSection( |
| routing_id(), |
| preview_params.metafile_data_handle, |
| &preview_params.metafile_data_handle))) { |
| NOTREACHED() << "Send message failed."; |
| } |
| Send(new PrintHostMsg_PagesReadyForPreview(routing_id(), preview_params)); |
| } |
| |
| void PrintWebViewHelper::RenderPage( |
| const PrintMsg_Print_Params& params, float* scale_factor, int page_number, |
| WebFrame* frame, scoped_ptr<printing::NativeMetafile>* metafile) { |
| DCHECK(metafile->get()->context()); |
| |
| double content_width_in_points; |
| double content_height_in_points; |
| double margin_top_in_points; |
| double margin_left_in_points; |
| GetPageSizeAndMarginsInPoints(frame, page_number, params, |
| &content_width_in_points, |
| &content_height_in_points, |
| &margin_top_in_points, NULL, NULL, |
| &margin_left_in_points); |
| |
| // 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.max_shrink); |
| int height = static_cast<int>(content_height_in_points * params.max_shrink); |
| |
| gfx::Size page_size(width, height); |
| gfx::Point content_origin(static_cast<int>(margin_left_in_points), |
| static_cast<int>(margin_top_in_points)); |
| skia::PlatformDevice* device = (*metafile)->StartPageForVectorCanvas( |
| page_size, content_origin, 1.0f); |
| DCHECK(device); |
| skia::VectorCanvas canvas(device); |
| |
| 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; |
| } |
| |
| bool result = (*metafile)->FinishPage(); |
| DCHECK(result); |
| |
| skia::VectorPlatformDevice* platform_device = |
| static_cast<skia::VectorPlatformDevice*>(device); |
| if (platform_device->alpha_blend_used() && !params.supports_alpha_blend) { |
| // Close the device context to retrieve the compiled metafile. |
| if (!(*metafile)->FinishDocument()) |
| NOTREACHED(); |
| |
| scoped_ptr<printing::NativeMetafile> metafile2( |
| printing::NativeMetafileFactory::Create()); |
| // 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); |
| |
| HDC hdc = metafile2->context(); |
| DCHECK(hdc); |
| skia::PlatformDevice::InitializeDC(hdc); |
| |
| RECT metafile_bounds = (*metafile)->GetPageBounds(1).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); |
| metafile->reset(metafile2.release()); |
| } |
| } |
| |
| bool PrintWebViewHelper::CopyMetafileDataToSharedMem( |
| printing::NativeMetafile* metafile, |
| base::SharedMemoryHandle* shared_mem_handle) { |
| uint32 buf_size = metafile->GetDataSize(); |
| 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) { |
| NOTREACHED() << "Buffer too large: " << buf_size; |
| return false; |
| } |
| |
| // Allocate a shared memory buffer to hold the generated metafile data. |
| if (!shared_buf.CreateAndMapAnonymous(buf_size)) { |
| NOTREACHED() << "Buffer allocation failed"; |
| return false; |
| } |
| |
| // Copy the bits into shared memory. |
| if (!metafile->GetData(shared_buf.memory(), buf_size)) { |
| NOTREACHED() << "GetData() failed"; |
| shared_buf.Unmap(); |
| return false; |
| } |
| shared_buf.GiveToProcess(base::GetCurrentProcessHandle(), shared_mem_handle); |
| shared_buf.Unmap(); |
| return true; |
| } |
