1 // Copyright 2016 PDFium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com 6 7 #include "core/fpdfapi/render/cpdf_scaledrenderbuffer.h" 8 9 #include "core/fpdfapi/render/cpdf_rendercontext.h" 10 #include "core/fpdfapi/render/cpdf_renderoptions.h" 11 #include "core/fxge/cfx_fxgedevice.h" 12 #include "core/fxge/cfx_renderdevice.h" 13 #include "third_party/base/ptr_util.h" 14 15 #define _FPDFAPI_IMAGESIZE_LIMIT_ (30 * 1024 * 1024) 16 17 CPDF_ScaledRenderBuffer::CPDF_ScaledRenderBuffer() {} 18 19 CPDF_ScaledRenderBuffer::~CPDF_ScaledRenderBuffer() {} 20 21 bool CPDF_ScaledRenderBuffer::Initialize(CPDF_RenderContext* pContext, 22 CFX_RenderDevice* pDevice, 23 const FX_RECT& pRect, 24 const CPDF_PageObject* pObj, 25 const CPDF_RenderOptions* pOptions, 26 int max_dpi) { 27 m_pDevice = pDevice; 28 if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_GET_BITS) 29 return true; 30 31 m_pContext = pContext; 32 m_Rect = pRect; 33 m_pObject = pObj; 34 m_Matrix.Translate(-pRect.left, -pRect.top); 35 int horz_size = pDevice->GetDeviceCaps(FXDC_HORZ_SIZE); 36 int vert_size = pDevice->GetDeviceCaps(FXDC_VERT_SIZE); 37 if (horz_size && vert_size && max_dpi) { 38 int dpih = 39 pDevice->GetDeviceCaps(FXDC_PIXEL_WIDTH) * 254 / (horz_size * 10); 40 int dpiv = 41 pDevice->GetDeviceCaps(FXDC_PIXEL_HEIGHT) * 254 / (vert_size * 10); 42 if (dpih > max_dpi) 43 m_Matrix.Scale((FX_FLOAT)(max_dpi) / dpih, 1.0f); 44 if (dpiv > max_dpi) 45 m_Matrix.Scale(1.0f, (FX_FLOAT)(max_dpi) / (FX_FLOAT)dpiv); 46 } 47 m_pBitmapDevice = pdfium::MakeUnique<CFX_FxgeDevice>(); 48 FXDIB_Format dibFormat = FXDIB_Rgb; 49 int32_t bpp = 24; 50 if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_ALPHA_OUTPUT) { 51 dibFormat = FXDIB_Argb; 52 bpp = 32; 53 } 54 while (1) { 55 CFX_FloatRect rect(pRect); 56 m_Matrix.TransformRect(rect); 57 FX_RECT bitmap_rect = rect.GetOuterRect(); 58 int32_t iWidth = bitmap_rect.Width(); 59 int32_t iHeight = bitmap_rect.Height(); 60 int32_t iPitch = (iWidth * bpp + 31) / 32 * 4; 61 if (iWidth * iHeight < 1) 62 return false; 63 64 if (iPitch * iHeight <= _FPDFAPI_IMAGESIZE_LIMIT_ && 65 m_pBitmapDevice->Create(iWidth, iHeight, dibFormat, nullptr)) { 66 break; 67 } 68 m_Matrix.Scale(0.5f, 0.5f); 69 } 70 m_pContext->GetBackground(m_pBitmapDevice->GetBitmap(), m_pObject, pOptions, 71 &m_Matrix); 72 return true; 73 } 74 75 void CPDF_ScaledRenderBuffer::OutputToDevice() { 76 if (m_pBitmapDevice) { 77 m_pDevice->StretchDIBits(m_pBitmapDevice->GetBitmap(), m_Rect.left, 78 m_Rect.top, m_Rect.Width(), m_Rect.Height()); 79 } 80 } 81
