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_devicebuffer.h"
10 #include "core/fpdfapi/render/cpdf_rendercontext.h"
11 #include "core/fxge/cfx_defaultrenderdevice.h"
12 #include "core/fxge/dib/cfx_dibitmap.h"
13
14 namespace {
15
16 constexpr size_t kImageSizeLimitBytes = 30 * 1024 * 1024;
17
18 } // namespace
19
20 CPDF_ScaledRenderBuffer::CPDF_ScaledRenderBuffer() = default;
21
22 CPDF_ScaledRenderBuffer::~CPDF_ScaledRenderBuffer() = default;
23
Initialize(CPDF_RenderContext * pContext,CFX_RenderDevice * pDevice,const FX_RECT & rect,const CPDF_PageObject * pObj,const CPDF_RenderOptions * pOptions,int max_dpi)24 bool CPDF_ScaledRenderBuffer::Initialize(CPDF_RenderContext* pContext,
25 CFX_RenderDevice* pDevice,
26 const FX_RECT& rect,
27 const CPDF_PageObject* pObj,
28 const CPDF_RenderOptions* pOptions,
29 int max_dpi) {
30 m_pDevice = pDevice;
31 if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_GET_BITS)
32 return true;
33
34 m_pContext = pContext;
35 m_Rect = rect;
36 m_pObject = pObj;
37 m_Matrix = CPDF_DeviceBuffer::CalculateMatrix(pDevice, rect, max_dpi,
38 /*scale=*/true);
39 m_pBitmapDevice = std::make_unique<CFX_DefaultRenderDevice>();
40 bool bIsAlpha =
41 !!(m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_ALPHA_OUTPUT);
42 FXDIB_Format dibFormat = bIsAlpha ? FXDIB_Format::kArgb : FXDIB_Format::kRgb;
43 while (1) {
44 FX_RECT bitmap_rect =
45 m_Matrix.TransformRect(CFX_FloatRect(rect)).GetOuterRect();
46 int32_t width = bitmap_rect.Width();
47 int32_t height = bitmap_rect.Height();
48 // Set to 0 to make CalculatePitchAndSize() calculate it.
49 constexpr uint32_t kNoPitch = 0;
50 Optional<CFX_DIBitmap::PitchAndSize> pitch_size =
51 CFX_DIBitmap::CalculatePitchAndSize(width, height, dibFormat, kNoPitch);
52 if (!pitch_size.has_value())
53 return false;
54
55 if (pitch_size.value().size <= kImageSizeLimitBytes &&
56 m_pBitmapDevice->Create(width, height, dibFormat, nullptr)) {
57 break;
58 }
59 m_Matrix.Scale(0.5f, 0.5f);
60 }
61 m_pContext->GetBackground(m_pBitmapDevice->GetBitmap(), m_pObject.Get(),
62 pOptions, m_Matrix);
63 return true;
64 }
65
GetDevice() const66 CFX_RenderDevice* CPDF_ScaledRenderBuffer::GetDevice() const {
67 return m_pBitmapDevice ? m_pBitmapDevice.get() : m_pDevice.Get();
68 }
69
OutputToDevice()70 void CPDF_ScaledRenderBuffer::OutputToDevice() {
71 if (m_pBitmapDevice) {
72 m_pDevice->StretchDIBits(m_pBitmapDevice->GetBitmap(), m_Rect.left,
73 m_Rect.top, m_Rect.Width(), m_Rect.Height());
74 }
75 }
76