| // Copyright 2014 PDFium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| |
| #include <windows.h> |
| |
| #include <algorithm> |
| #include <memory> |
| #include <vector> |
| |
| #include "core/fxcrt/fx_system.h" |
| #include "core/fxge/cfx_renderdevice.h" |
| #include "core/fxge/cfx_windowsdevice.h" |
| #include "core/fxge/dib/dib_int.h" |
| #include "core/fxge/fx_freetype.h" |
| #include "core/fxge/ge/fx_text_int.h" |
| #include "core/fxge/win32/win32_int.h" |
| |
| #if defined(PDFIUM_PRINT_TEXT_WITH_GDI) |
| namespace { |
| |
| class ScopedState { |
| public: |
| ScopedState(HDC hDC, HFONT hFont) : m_hDC(hDC) { |
| m_iState = SaveDC(m_hDC); |
| m_hFont = SelectObject(m_hDC, hFont); |
| } |
| |
| ~ScopedState() { |
| HGDIOBJ hFont = SelectObject(m_hDC, m_hFont); |
| DeleteObject(hFont); |
| RestoreDC(m_hDC, m_iState); |
| } |
| |
| private: |
| HDC m_hDC; |
| HGDIOBJ m_hFont; |
| int m_iState; |
| |
| ScopedState(const ScopedState&) = delete; |
| void operator=(const ScopedState&) = delete; |
| }; |
| |
| } // namespace |
| |
| bool g_pdfium_print_text_with_gdi = false; |
| |
| PDFiumEnsureTypefaceCharactersAccessible g_pdfium_typeface_accessible_func = |
| nullptr; |
| #endif |
| |
| CGdiPrinterDriver::CGdiPrinterDriver(HDC hDC) |
| : CGdiDeviceDriver(hDC, FXDC_PRINTER), |
| m_HorzSize(::GetDeviceCaps(m_hDC, HORZSIZE)), |
| m_VertSize(::GetDeviceCaps(m_hDC, VERTSIZE)) {} |
| |
| CGdiPrinterDriver::~CGdiPrinterDriver() {} |
| |
| int CGdiPrinterDriver::GetDeviceCaps(int caps_id) const { |
| if (caps_id == FXDC_HORZ_SIZE) |
| return m_HorzSize; |
| if (caps_id == FXDC_VERT_SIZE) |
| return m_VertSize; |
| return CGdiDeviceDriver::GetDeviceCaps(caps_id); |
| } |
| |
| FX_BOOL CGdiPrinterDriver::SetDIBits(const CFX_DIBSource* pSource, |
| uint32_t color, |
| const FX_RECT* pSrcRect, |
| int left, |
| int top, |
| int blend_type) { |
| if (pSource->IsAlphaMask()) { |
| FX_RECT clip_rect(left, top, left + pSrcRect->Width(), |
| top + pSrcRect->Height()); |
| return StretchDIBits(pSource, color, left - pSrcRect->left, |
| top - pSrcRect->top, pSource->GetWidth(), |
| pSource->GetHeight(), &clip_rect, 0, |
| FXDIB_BLEND_NORMAL); |
| } |
| ASSERT(pSource && !pSource->IsAlphaMask() && pSrcRect); |
| ASSERT(blend_type == FXDIB_BLEND_NORMAL); |
| if (pSource->HasAlpha()) |
| return FALSE; |
| |
| CFX_DIBExtractor temp(pSource); |
| CFX_DIBitmap* pBitmap = temp.GetBitmap(); |
| if (!pBitmap) |
| return FALSE; |
| |
| return GDI_SetDIBits(pBitmap, pSrcRect, left, top); |
| } |
| |
| FX_BOOL CGdiPrinterDriver::StretchDIBits(const CFX_DIBSource* pSource, |
| uint32_t color, |
| int dest_left, |
| int dest_top, |
| int dest_width, |
| int dest_height, |
| const FX_RECT* pClipRect, |
| uint32_t flags, |
| int blend_type) { |
| if (pSource->IsAlphaMask()) { |
| int alpha = FXARGB_A(color); |
| if (pSource->GetBPP() != 1 || alpha != 255) |
| return FALSE; |
| |
| if (dest_width < 0 || dest_height < 0) { |
| std::unique_ptr<CFX_DIBitmap> pFlipped( |
| pSource->FlipImage(dest_width < 0, dest_height < 0)); |
| if (!pFlipped) |
| return FALSE; |
| |
| if (dest_width < 0) |
| dest_left += dest_width; |
| if (dest_height < 0) |
| dest_top += dest_height; |
| |
| return GDI_StretchBitMask(pFlipped.get(), dest_left, dest_top, |
| abs(dest_width), abs(dest_height), color, |
| flags); |
| } |
| |
| CFX_DIBExtractor temp(pSource); |
| CFX_DIBitmap* pBitmap = temp.GetBitmap(); |
| if (!pBitmap) |
| return FALSE; |
| return GDI_StretchBitMask(pBitmap, dest_left, dest_top, dest_width, |
| dest_height, color, flags); |
| } |
| |
| if (pSource->HasAlpha()) |
| return FALSE; |
| |
| if (dest_width < 0 || dest_height < 0) { |
| std::unique_ptr<CFX_DIBitmap> pFlipped( |
| pSource->FlipImage(dest_width < 0, dest_height < 0)); |
| if (!pFlipped) |
| return FALSE; |
| |
| if (dest_width < 0) |
| dest_left += dest_width; |
| if (dest_height < 0) |
| dest_top += dest_height; |
| |
| return GDI_StretchDIBits(pFlipped.get(), dest_left, dest_top, |
| abs(dest_width), abs(dest_height), flags); |
| } |
| |
| CFX_DIBExtractor temp(pSource); |
| CFX_DIBitmap* pBitmap = temp.GetBitmap(); |
| if (!pBitmap) |
| return FALSE; |
| return GDI_StretchDIBits(pBitmap, dest_left, dest_top, dest_width, |
| dest_height, flags); |
| } |
| |
| FX_BOOL CGdiPrinterDriver::StartDIBits(const CFX_DIBSource* pSource, |
| int bitmap_alpha, |
| uint32_t color, |
| const CFX_Matrix* pMatrix, |
| uint32_t render_flags, |
| void*& handle, |
| int blend_type) { |
| if (bitmap_alpha < 255 || pSource->HasAlpha() || |
| (pSource->IsAlphaMask() && (pSource->GetBPP() != 1))) { |
| return FALSE; |
| } |
| CFX_FloatRect unit_rect = pMatrix->GetUnitRect(); |
| FX_RECT full_rect = unit_rect.GetOuterRect(); |
| if (FXSYS_fabs(pMatrix->b) < 0.5f && pMatrix->a != 0 && |
| FXSYS_fabs(pMatrix->c) < 0.5f && pMatrix->d != 0) { |
| FX_BOOL bFlipX = pMatrix->a < 0; |
| FX_BOOL bFlipY = pMatrix->d > 0; |
| return StretchDIBits(pSource, color, |
| bFlipX ? full_rect.right : full_rect.left, |
| bFlipY ? full_rect.bottom : full_rect.top, |
| bFlipX ? -full_rect.Width() : full_rect.Width(), |
| bFlipY ? -full_rect.Height() : full_rect.Height(), |
| nullptr, 0, blend_type); |
| } |
| if (FXSYS_fabs(pMatrix->a) >= 0.5f || FXSYS_fabs(pMatrix->d) >= 0.5f) |
| return FALSE; |
| |
| std::unique_ptr<CFX_DIBitmap> pTransformed( |
| pSource->SwapXY(pMatrix->c > 0, pMatrix->b < 0)); |
| if (!pTransformed) |
| return FALSE; |
| |
| return StretchDIBits(pTransformed.get(), color, full_rect.left, full_rect.top, |
| full_rect.Width(), full_rect.Height(), nullptr, 0, |
| blend_type); |
| } |
| |
| FX_BOOL CGdiPrinterDriver::DrawDeviceText(int nChars, |
| const FXTEXT_CHARPOS* pCharPos, |
| CFX_Font* pFont, |
| const CFX_Matrix* pObject2Device, |
| FX_FLOAT font_size, |
| uint32_t color) { |
| #if defined(PDFIUM_PRINT_TEXT_WITH_GDI) |
| if (!g_pdfium_print_text_with_gdi) |
| return FALSE; |
| |
| if (nChars < 1 || !pFont || !pFont->IsEmbedded() || !pFont->IsTTFont()) |
| return FALSE; |
| |
| // Scale factor used to minimize the kerning problems caused by rounding |
| // errors below. Value choosen based on the title of https://crbug.com/18383 |
| const double kScaleFactor = 10; |
| |
| // Font |
| // |
| // Note that |pFont| has the actual font to render with embedded within, but |
| // but unfortunately AddFontMemResourceEx() does not seem to cooperate. |
| // Loading font data to memory seems to work, but then enumerating the fonts |
| // fails to find it. This requires more investigation. In the meanwhile, |
| // assume the printing is happening on the machine that generated the PDF, so |
| // the embedded font, if not a web font, is available through GDI anyway. |
| // TODO(thestig): Figure out why AddFontMemResourceEx() does not work. |
| // Generalize this method to work for all PDFs with embedded fonts. |
| // In sandboxed environments, font loading may not work at all, so this may be |
| // the best possible effort. |
| LOGFONT lf = {}; |
| lf.lfHeight = -font_size * kScaleFactor; |
| lf.lfWeight = pFont->IsBold() ? FW_BOLD : FW_NORMAL; |
| lf.lfItalic = pFont->IsItalic(); |
| lf.lfCharSet = DEFAULT_CHARSET; |
| |
| const CFX_WideString wsName = pFont->GetFaceName().UTF8Decode(); |
| int iNameLen = std::min(wsName.GetLength(), LF_FACESIZE - 1); |
| memcpy(lf.lfFaceName, wsName.c_str(), sizeof(lf.lfFaceName[0]) * iNameLen); |
| lf.lfFaceName[iNameLen] = 0; |
| |
| HFONT hFont = CreateFontIndirect(&lf); |
| if (!hFont) |
| return FALSE; |
| |
| ScopedState state(m_hDC, hFont); |
| size_t nTextMetricSize = GetOutlineTextMetrics(m_hDC, 0, nullptr); |
| if (nTextMetricSize == 0) { |
| // Give up and fail if there is no way to get the font to try again. |
| if (!g_pdfium_typeface_accessible_func) |
| return FALSE; |
| |
| // Try to get the font. Any letter will do. |
| g_pdfium_typeface_accessible_func(&lf, L"A", 1); |
| nTextMetricSize = GetOutlineTextMetrics(m_hDC, 0, nullptr); |
| if (nTextMetricSize == 0) |
| return FALSE; |
| } |
| |
| std::vector<BYTE> buf(nTextMetricSize); |
| OUTLINETEXTMETRIC* pTextMetric = |
| reinterpret_cast<OUTLINETEXTMETRIC*>(buf.data()); |
| if (GetOutlineTextMetrics(m_hDC, nTextMetricSize, pTextMetric) == 0) |
| return FALSE; |
| |
| // If the selected font is not the requested font, then bail out. This can |
| // happen with web fonts, for example. |
| wchar_t* wsSelectedName = reinterpret_cast<wchar_t*>( |
| buf.data() + reinterpret_cast<size_t>(pTextMetric->otmpFaceName)); |
| if (wsName != wsSelectedName) |
| return FALSE; |
| |
| // Transforms |
| SetGraphicsMode(m_hDC, GM_ADVANCED); |
| XFORM xform; |
| xform.eM11 = pObject2Device->GetA() / kScaleFactor; |
| xform.eM12 = pObject2Device->GetB() / kScaleFactor; |
| xform.eM21 = -pObject2Device->GetC() / kScaleFactor; |
| xform.eM22 = -pObject2Device->GetD() / kScaleFactor; |
| xform.eDx = pObject2Device->GetE(); |
| xform.eDy = pObject2Device->GetF(); |
| ModifyWorldTransform(m_hDC, &xform, MWT_LEFTMULTIPLY); |
| |
| // Color |
| int iUnusedAlpha; |
| FX_COLORREF rgb; |
| ArgbDecode(color, iUnusedAlpha, rgb); |
| SetTextColor(m_hDC, rgb); |
| SetBkMode(m_hDC, TRANSPARENT); |
| |
| // Text |
| CFX_WideString wsText; |
| std::vector<INT> spacing(nChars); |
| FX_FLOAT fPreviousOriginX = 0; |
| for (int i = 0; i < nChars; ++i) { |
| // Only works with PDFs from Skia's PDF generator. Cannot handle arbitrary |
| // values from PDFs. |
| const FXTEXT_CHARPOS& charpos = pCharPos[i]; |
| ASSERT(charpos.m_AdjustMatrix[0] == 0); |
| ASSERT(charpos.m_AdjustMatrix[1] == 0); |
| ASSERT(charpos.m_AdjustMatrix[2] == 0); |
| ASSERT(charpos.m_AdjustMatrix[3] == 0); |
| ASSERT(charpos.m_OriginY == 0); |
| |
| // Round the spacing to the nearest integer, but keep track of the rounding |
| // error for calculating the next spacing value. |
| FX_FLOAT fOriginX = charpos.m_OriginX * kScaleFactor; |
| FX_FLOAT fPixelSpacing = fOriginX - fPreviousOriginX; |
| spacing[i] = FXSYS_round(fPixelSpacing); |
| fPreviousOriginX = fOriginX - (fPixelSpacing - spacing[i]); |
| |
| wsText += charpos.m_GlyphIndex; |
| } |
| |
| // Draw |
| SetTextAlign(m_hDC, TA_LEFT | TA_BASELINE); |
| if (ExtTextOutW(m_hDC, 0, 0, ETO_GLYPH_INDEX, nullptr, wsText.c_str(), nChars, |
| nChars > 1 ? &spacing[1] : nullptr)) { |
| return TRUE; |
| } |
| |
| // Give up and fail if there is no way to get the font to try again. |
| if (!g_pdfium_typeface_accessible_func) |
| return FALSE; |
| |
| // Try to get the font and draw again. |
| g_pdfium_typeface_accessible_func(&lf, wsText.c_str(), nChars); |
| return ExtTextOutW(m_hDC, 0, 0, ETO_GLYPH_INDEX, nullptr, wsText.c_str(), |
| nChars, nChars > 1 ? &spacing[1] : nullptr); |
| #else |
| return FALSE; |
| #endif |
| } |
