// Copyright 2016 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 "core/fpdfapi/render/cpdf_scaledrenderbuffer.h" #include "core/fpdfapi/render/cpdf_rendercontext.h" #include "core/fpdfapi/render/cpdf_renderoptions.h" #include "core/fxge/cfx_fxgedevice.h" #include "core/fxge/cfx_renderdevice.h" #include "third_party/base/ptr_util.h" #define _FPDFAPI_IMAGESIZE_LIMIT_ (30 * 1024 * 1024) CPDF_ScaledRenderBuffer::CPDF_ScaledRenderBuffer() {} CPDF_ScaledRenderBuffer::~CPDF_ScaledRenderBuffer() {} bool CPDF_ScaledRenderBuffer::Initialize(CPDF_RenderContext* pContext, CFX_RenderDevice* pDevice, const FX_RECT& pRect, const CPDF_PageObject* pObj, const CPDF_RenderOptions* pOptions, int max_dpi) { m_pDevice = pDevice; if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_GET_BITS) return true; m_pContext = pContext; m_Rect = pRect; m_pObject = pObj; m_Matrix.Translate(-pRect.left, -pRect.top); int horz_size = pDevice->GetDeviceCaps(FXDC_HORZ_SIZE); int vert_size = pDevice->GetDeviceCaps(FXDC_VERT_SIZE); if (horz_size && vert_size && max_dpi) { int dpih = pDevice->GetDeviceCaps(FXDC_PIXEL_WIDTH) * 254 / (horz_size * 10); int dpiv = pDevice->GetDeviceCaps(FXDC_PIXEL_HEIGHT) * 254 / (vert_size * 10); if (dpih > max_dpi) m_Matrix.Scale((FX_FLOAT)(max_dpi) / dpih, 1.0f); if (dpiv > max_dpi) m_Matrix.Scale(1.0f, (FX_FLOAT)(max_dpi) / (FX_FLOAT)dpiv); } m_pBitmapDevice = pdfium::MakeUnique<CFX_FxgeDevice>(); FXDIB_Format dibFormat = FXDIB_Rgb; int32_t bpp = 24; if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_ALPHA_OUTPUT) { dibFormat = FXDIB_Argb; bpp = 32; } while (1) { CFX_FloatRect rect(pRect); m_Matrix.TransformRect(rect); FX_RECT bitmap_rect = rect.GetOuterRect(); int32_t iWidth = bitmap_rect.Width(); int32_t iHeight = bitmap_rect.Height(); int32_t iPitch = (iWidth * bpp + 31) / 32 * 4; if (iWidth * iHeight < 1) return false; if (iPitch * iHeight <= _FPDFAPI_IMAGESIZE_LIMIT_ && m_pBitmapDevice->Create(iWidth, iHeight, dibFormat, nullptr)) { break; } m_Matrix.Scale(0.5f, 0.5f); } m_pContext->GetBackground(m_pBitmapDevice->GetBitmap(), m_pObject, pOptions, &m_Matrix); return true; } void CPDF_ScaledRenderBuffer::OutputToDevice() { if (m_pBitmapDevice) { m_pDevice->StretchDIBits(m_pBitmapDevice->GetBitmap(), m_Rect.left, m_Rect.top, m_Rect.Width(), m_Rect.Height()); } }