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 "build/build_config.h"
10 #include "core/fpdfapi/page/cpdf_pageobject.h"
11 #include "core/fpdfapi/parser/cpdf_dictionary.h"
12 #include "core/fpdfapi/render/cpdf_rendercontext.h"
13 #include "core/fpdfapi/render/cpdf_renderoptions.h"
14 #include "core/fxge/cfx_defaultrenderdevice.h"
15 #include "core/fxge/cfx_renderdevice.h"
16 #include "core/fxge/dib/cfx_dibitmap.h"
17 #include "core/fxge/dib/fx_dib.h"
18
19 namespace {
20
21 #if BUILDFLAG(IS_APPLE)
22 constexpr bool kScaleDeviceBuffer = false;
23 #else
24 constexpr bool kScaleDeviceBuffer = true;
25 #endif
26
27 } // namespace
28
29 // static
CalculateMatrix(CFX_RenderDevice * pDevice,const FX_RECT & rect,int max_dpi,bool scale)30 CFX_Matrix CPDF_DeviceBuffer::CalculateMatrix(CFX_RenderDevice* pDevice,
31 const FX_RECT& rect,
32 int max_dpi,
33 bool scale) {
34 CFX_Matrix matrix;
35 matrix.Translate(-rect.left, -rect.top);
36 if (scale) {
37 int horz_size = pDevice->GetDeviceCaps(FXDC_HORZ_SIZE);
38 int vert_size = pDevice->GetDeviceCaps(FXDC_VERT_SIZE);
39 if (horz_size && vert_size && max_dpi) {
40 int dpih =
41 pDevice->GetDeviceCaps(FXDC_PIXEL_WIDTH) * 254 / (horz_size * 10);
42 int dpiv =
43 pDevice->GetDeviceCaps(FXDC_PIXEL_HEIGHT) * 254 / (vert_size * 10);
44 if (dpih > max_dpi)
45 matrix.Scale(static_cast<float>(max_dpi) / dpih, 1.0f);
46 if (dpiv > max_dpi)
47 matrix.Scale(1.0f, static_cast<float>(max_dpi) / dpiv);
48 }
49 }
50 return matrix;
51 }
52
CPDF_DeviceBuffer(CPDF_RenderContext * pContext,CFX_RenderDevice * pDevice,const FX_RECT & rect,const CPDF_PageObject * pObj,int max_dpi)53 CPDF_DeviceBuffer::CPDF_DeviceBuffer(CPDF_RenderContext* pContext,
54 CFX_RenderDevice* pDevice,
55 const FX_RECT& rect,
56 const CPDF_PageObject* pObj,
57 int max_dpi)
58 : m_pDevice(pDevice),
59 m_pContext(pContext),
60 m_pObject(pObj),
61 m_pBitmap(pdfium::MakeRetain<CFX_DIBitmap>()),
62 m_Rect(rect),
63 m_Matrix(CalculateMatrix(pDevice, rect, max_dpi, kScaleDeviceBuffer)) {}
64
65 CPDF_DeviceBuffer::~CPDF_DeviceBuffer() = default;
66
Initialize()67 bool CPDF_DeviceBuffer::Initialize() {
68 FX_RECT bitmap_rect =
69 m_Matrix.TransformRect(CFX_FloatRect(m_Rect)).GetOuterRect();
70 return m_pBitmap->Create(bitmap_rect.Width(), bitmap_rect.Height(),
71 FXDIB_Format::kArgb);
72 }
73
OutputToDevice()74 void CPDF_DeviceBuffer::OutputToDevice() {
75 if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_GET_BITS) {
76 if (m_Matrix.a == 1.0f && m_Matrix.d == 1.0f) {
77 m_pDevice->SetDIBits(m_pBitmap, m_Rect.left, m_Rect.top);
78 } else {
79 m_pDevice->StretchDIBits(m_pBitmap, m_Rect.left, m_Rect.top,
80 m_Rect.Width(), m_Rect.Height());
81 }
82 return;
83 }
84 auto pBuffer = pdfium::MakeRetain<CFX_DIBitmap>();
85 m_pDevice->CreateCompatibleBitmap(pBuffer, m_pBitmap->GetWidth(),
86 m_pBitmap->GetHeight());
87 m_pContext->GetBackground(pBuffer, m_pObject, nullptr, m_Matrix);
88 pBuffer->CompositeBitmap(0, 0, pBuffer->GetWidth(), pBuffer->GetHeight(),
89 m_pBitmap, 0, 0, BlendMode::kNormal, nullptr, false);
90 m_pDevice->StretchDIBits(pBuffer, m_Rect.left, m_Rect.top, m_Rect.Width(),
91 m_Rect.Height());
92 }
93