diff options
Diffstat (limited to 'printing/emf_win.cc')
| -rw-r--r-- | printing/emf_win.cc | 109 |
1 files changed, 98 insertions, 11 deletions
diff --git a/printing/emf_win.cc b/printing/emf_win.cc index 3634cbd..a5d4c02 100644 --- a/printing/emf_win.cc +++ b/printing/emf_win.cc @@ -7,6 +7,9 @@ #include "base/file_path.h" #include "base/logging.h" #include "base/memory/scoped_ptr.h" +#include "base/win/scoped_gdi_object.h" +#include "base/win/scoped_hdc.h" +#include "base/win/scoped_select_object.h" #include "skia/ext/vector_platform_device_emf_win.h" #include "third_party/skia/include/core/SkBitmap.h" #include "ui/gfx/codec/jpeg_codec.h" @@ -16,6 +19,7 @@ #include "ui/gfx/size.h" namespace { + const int kCustomGdiCommentSignature = 0xdeadbabe; struct PageBreakRecord { int signature; @@ -31,8 +35,27 @@ struct PageBreakRecord { (type >= START_PAGE) && (type <= END_PAGE); } }; + +int CALLBACK IsAlphaBlendUsedEnumProc(HDC, + HANDLETABLE*, + const ENHMETARECORD *record, + int, + LPARAM data) { + bool* result = reinterpret_cast<bool*>(data); + if (!result) + return 0; + switch (record->iType) { + case EMR_ALPHABLEND: { + *result = true; + return 0; + break; + } + } + return 1; } +} // namespace + namespace printing { bool DIBFormatNativelySupported(HDC dc, uint32 escape, const BYTE* bits, @@ -126,19 +149,12 @@ gfx::Rect Emf::GetPageBounds(unsigned int page_number) const { NOTREACHED(); return gfx::Rect(); } - if (header.rclBounds.left == 0 && - header.rclBounds.top == 0 && - header.rclBounds.right == -1 && - header.rclBounds.bottom == -1) { - // A freshly created EMF buffer that has no drawing operation has invalid - // bounds. Instead of having an (0,0) size, it has a (-1,-1) size. Detect - // this special case and returns an empty Rect instead of an invalid one. - return gfx::Rect(); - } + // Add 1 to right and bottom because it's inclusive rectangle. + // See ENHMETAHEADER. return gfx::Rect(header.rclBounds.left, header.rclBounds.top, - header.rclBounds.right - header.rclBounds.left, - header.rclBounds.bottom - header.rclBounds.top); + header.rclBounds.right - header.rclBounds.left + 1, + header.rclBounds.bottom - header.rclBounds.top + 1); } uint32 Emf::GetDataSize() const { @@ -478,4 +494,75 @@ int CALLBACK Emf::Enumerator::EnhMetaFileProc(HDC hdc, return 1; } +bool Emf::IsAlphaBlendUsed() const { + bool result = false; + ::EnumEnhMetaFile(NULL, + emf(), + &IsAlphaBlendUsedEnumProc, + &result, + NULL); + return result; +} + +Emf* Emf::RasterizeMetafile(int raster_area_in_pixels) const { + gfx::Rect page_bounds = GetPageBounds(1); + gfx::Size page_size(page_bounds.size()); + if (page_size.GetArea() <= 0) { + NOTREACHED() << "Metafile is empty"; + page_bounds = gfx::Rect(1, 1); + } + + float scale = sqrt(float(raster_area_in_pixels) / page_size.GetArea()); + page_size.set_width(std::max<int>(1, page_size.width() * scale)); + page_size.set_height(std::max<int>(1, page_size.height() * scale)); + + base::win::ScopedCreateDC bitmap_dc(::CreateCompatibleDC(NULL)); + if (!bitmap_dc) { + NOTREACHED() << "Bitmap DC creation failed"; + return NULL; + } + ::SetGraphicsMode(bitmap_dc, GM_ADVANCED); + void* bits = NULL; + BITMAPINFO hdr; + gfx::CreateBitmapHeader(page_size.width(), page_size.height(), + &hdr.bmiHeader); + base::win::ScopedBitmap hbitmap(CreateDIBSection( + bitmap_dc, &hdr, DIB_RGB_COLORS, &bits, NULL, 0)); + if (!hbitmap) + NOTREACHED() << "Raster bitmap creation for printing failed"; + + base::win::ScopedSelectObject selectBitmap(bitmap_dc, hbitmap); + RECT rect = { 0, 0, page_size.width(), page_size.height() }; + HBRUSH white_brush = static_cast<HBRUSH>(::GetStockObject(WHITE_BRUSH)); + FillRect(bitmap_dc, &rect, white_brush); + + gfx::Rect bitmap_rect(page_size); + Playback(bitmap_dc, &bitmap_rect.ToRECT()); + + scoped_ptr<Emf> result(new Emf); + result->Init(); + HDC hdc = result->context(); + DCHECK(hdc); + skia::InitializeDC(hdc); + + // Params are ignored. + result->StartPage(page_bounds.size(), page_bounds, 1); + + ::ModifyWorldTransform(hdc, NULL, MWT_IDENTITY); + XFORM xform = { + float(page_bounds.width()) / bitmap_rect.width(), 0, + 0, float(page_bounds.height()) / bitmap_rect.height(), + page_bounds.x(), + page_bounds.y(), + }; + ::SetWorldTransform(hdc, &xform); + ::BitBlt(hdc, 0, 0, bitmap_rect.width(), bitmap_rect.height(), + bitmap_dc, bitmap_rect.x(), bitmap_rect.y(), SRCCOPY); + + result->FinishPage(); + result->FinishDocument(); + + return result.release(); +} + } // namespace printing |