1 // Copyright 2016 The PDFium Authors
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_devicebuffer.h"
8
9 #include <utility>
10
11 #include "build/build_config.h"
12 #include "core/fpdfapi/page/cpdf_pageobject.h"
13 #include "core/fpdfapi/parser/cpdf_dictionary.h"
14 #include "core/fpdfapi/render/cpdf_renderoptions.h"
15 #include "core/fxge/cfx_defaultrenderdevice.h"
16 #include "core/fxge/cfx_renderdevice.h"
17 #include "core/fxge/dib/cfx_dibitmap.h"
18 #include "core/fxge/dib/fx_dib.h"
19
20 #if BUILDFLAG(IS_WIN)
21 #include "core/fpdfapi/render/cpdf_rendercontext.h"
22 #else
23 #include "core/fxcrt/notreached.h"
24 #endif
25
26 namespace {
27
28 #if BUILDFLAG(IS_WIN)
29 constexpr bool kScaleDeviceBuffer = true;
30 #else
31 constexpr bool kScaleDeviceBuffer = false;
32 #endif
33
34 } // namespace
35
36 // static
CalculateMatrix(CFX_RenderDevice * pDevice,const FX_RECT & rect,int max_dpi,bool scale)37 CFX_Matrix CPDF_DeviceBuffer::CalculateMatrix(CFX_RenderDevice* pDevice,
38 const FX_RECT& rect,
39 int max_dpi,
40 bool scale) {
41 CFX_Matrix matrix;
42 matrix.Translate(-rect.left, -rect.top);
43 if (scale) {
44 int horz_size = pDevice->GetDeviceCaps(FXDC_HORZ_SIZE);
45 int vert_size = pDevice->GetDeviceCaps(FXDC_VERT_SIZE);
46 if (horz_size && vert_size && max_dpi) {
47 int dpih =
48 pDevice->GetDeviceCaps(FXDC_PIXEL_WIDTH) * 254 / (horz_size * 10);
49 int dpiv =
50 pDevice->GetDeviceCaps(FXDC_PIXEL_HEIGHT) * 254 / (vert_size * 10);
51 if (dpih > max_dpi)
52 matrix.Scale(static_cast<float>(max_dpi) / dpih, 1.0f);
53 if (dpiv > max_dpi)
54 matrix.Scale(1.0f, static_cast<float>(max_dpi) / dpiv);
55 }
56 }
57 return matrix;
58 }
59
CPDF_DeviceBuffer(CPDF_RenderContext * pContext,CFX_RenderDevice * pDevice,const FX_RECT & rect,const CPDF_PageObject * pObj,int max_dpi)60 CPDF_DeviceBuffer::CPDF_DeviceBuffer(CPDF_RenderContext* pContext,
61 CFX_RenderDevice* pDevice,
62 const FX_RECT& rect,
63 const CPDF_PageObject* pObj,
64 int max_dpi)
65 : m_pDevice(pDevice),
66 #if BUILDFLAG(IS_WIN)
67 m_pContext(pContext),
68 #endif
69 m_pObject(pObj),
70 m_pBitmap(pdfium::MakeRetain<CFX_DIBitmap>()),
71 m_Rect(rect),
72 m_Matrix(CalculateMatrix(pDevice, rect, max_dpi, kScaleDeviceBuffer)) {
73 }
74
75 CPDF_DeviceBuffer::~CPDF_DeviceBuffer() = default;
76
Initialize()77 RetainPtr<CFX_DIBitmap> CPDF_DeviceBuffer::Initialize() {
78 FX_RECT bitmap_rect =
79 m_Matrix.TransformRect(CFX_FloatRect(m_Rect)).GetOuterRect();
80 // TODO(crbug.com/355630557): Consider adding support for
81 // `FXDIB_Format::kBgraPremul`
82 if (!m_pBitmap->Create(bitmap_rect.Width(), bitmap_rect.Height(),
83 FXDIB_Format::kBgra)) {
84 return nullptr;
85 }
86 return m_pBitmap;
87 }
88
OutputToDevice()89 void CPDF_DeviceBuffer::OutputToDevice() {
90 if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_GET_BITS) {
91 if (m_Matrix.a == 1.0f && m_Matrix.d == 1.0f) {
92 m_pDevice->SetDIBits(m_pBitmap, m_Rect.left, m_Rect.top);
93 return;
94 }
95
96 #if BUILDFLAG(IS_WIN)
97 m_pDevice->StretchDIBits(m_pBitmap, m_Rect.left, m_Rect.top, m_Rect.Width(),
98 m_Rect.Height());
99 return;
100 #else
101 NOTREACHED_NORETURN();
102 #endif
103 }
104
105 #if BUILDFLAG(IS_WIN)
106 auto buffer = pdfium::MakeRetain<CFX_DIBitmap>();
107 if (!m_pDevice->CreateCompatibleBitmap(buffer, m_pBitmap->GetWidth(),
108 m_pBitmap->GetHeight())) {
109 return;
110 }
111 m_pContext->GetBackgroundToBitmap(buffer, m_pObject, m_Matrix);
112 buffer->CompositeBitmap(0, 0, buffer->GetWidth(), buffer->GetHeight(),
113 m_pBitmap, 0, 0, BlendMode::kNormal, nullptr, false);
114 m_pDevice->StretchDIBits(std::move(buffer), m_Rect.left, m_Rect.top,
115 m_Rect.Width(), m_Rect.Height());
116 #else
117 NOTREACHED_NORETURN();
118 #endif
119 }
120