| // 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_defaultrenderdevice.h" |
| #include "core/fxge/dib/cfx_dibitmap.h" |
| #include "third_party/base/ptr_util.h" |
| |
| namespace { |
| |
| constexpr size_t kImageSizeLimitBytes = 30 * 1024 * 1024; |
| |
| } // namespace |
| |
| 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((float)(max_dpi) / dpih, 1.0f); |
| if (dpiv > max_dpi) |
| m_Matrix.Scale(1.0f, (float)(max_dpi) / (float)dpiv); |
| } |
| m_pBitmapDevice = pdfium::MakeUnique<CFX_DefaultRenderDevice>(); |
| bool bIsAlpha = |
| !!(m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_ALPHA_OUTPUT); |
| FXDIB_Format dibFormat = bIsAlpha ? FXDIB_Argb : FXDIB_Rgb; |
| while (1) { |
| FX_RECT bitmap_rect = |
| m_Matrix.TransformRect(CFX_FloatRect(pRect)).GetOuterRect(); |
| int32_t width = bitmap_rect.Width(); |
| int32_t height = bitmap_rect.Height(); |
| // Set to 0 to make CalculatePitchAndSize() calculate it. |
| uint32_t pitch = 0; |
| uint32_t size; |
| if (!CFX_DIBitmap::CalculatePitchAndSize(width, height, dibFormat, &pitch, |
| &size)) { |
| return false; |
| } |
| |
| if (size <= kImageSizeLimitBytes && |
| m_pBitmapDevice->Create(width, height, dibFormat, nullptr)) { |
| break; |
| } |
| m_Matrix.Scale(0.5f, 0.5f); |
| } |
| m_pContext->GetBackground(m_pBitmapDevice->GetBitmap(), m_pObject.Get(), |
| 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()); |
| } |
| } |