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 #include "third_party/base/ptr_util.h"
14
15 namespace {
16
17 constexpr size_t kImageSizeLimitBytes = 30 * 1024 * 1024;
18
19 } // namespace
20
CPDF_ScaledRenderBuffer()21 CPDF_ScaledRenderBuffer::CPDF_ScaledRenderBuffer() {}
22
~CPDF_ScaledRenderBuffer()23 CPDF_ScaledRenderBuffer::~CPDF_ScaledRenderBuffer() {}
24
Initialize(CPDF_RenderContext * pContext,CFX_RenderDevice * pDevice,const FX_RECT & rect,const CPDF_PageObject * pObj,const CPDF_RenderOptions * pOptions,int max_dpi)25 bool CPDF_ScaledRenderBuffer::Initialize(CPDF_RenderContext* pContext,
26 CFX_RenderDevice* pDevice,
27 const FX_RECT& rect,
28 const CPDF_PageObject* pObj,
29 const CPDF_RenderOptions* pOptions,
30 int max_dpi) {
31 m_pDevice = pDevice;
32 if (m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_GET_BITS)
33 return true;
34
35 m_pContext = pContext;
36 m_Rect = rect;
37 m_pObject = pObj;
38 m_Matrix = CPDF_DeviceBuffer::CalculateMatrix(pDevice, rect, max_dpi,
39 /*scale=*/true);
40 m_pBitmapDevice = pdfium::MakeUnique<CFX_DefaultRenderDevice>();
41 bool bIsAlpha =
42 !!(m_pDevice->GetDeviceCaps(FXDC_RENDER_CAPS) & FXRC_ALPHA_OUTPUT);
43 FXDIB_Format dibFormat = bIsAlpha ? FXDIB_Argb : FXDIB_Rgb;
44 while (1) {
45 FX_RECT bitmap_rect =
46 m_Matrix.TransformRect(CFX_FloatRect(rect)).GetOuterRect();
47 int32_t width = bitmap_rect.Width();
48 int32_t height = bitmap_rect.Height();
49 // Set to 0 to make CalculatePitchAndSize() calculate it.
50 uint32_t pitch = 0;
51 size_t size;
52 if (!CFX_DIBitmap::CalculatePitchAndSize(width, height, dibFormat, &pitch,
53 &size)) {
54 return false;
55 }
56
57 if (size <= kImageSizeLimitBytes &&
58 m_pBitmapDevice->Create(width, height, dibFormat, nullptr)) {
59 break;
60 }
61 m_Matrix.Scale(0.5f, 0.5f);
62 }
63 m_pContext->GetBackground(m_pBitmapDevice->GetBitmap(), m_pObject.Get(),
64 pOptions, m_Matrix);
65 return true;
66 }
67
GetDevice() const68 CFX_RenderDevice* CPDF_ScaledRenderBuffer::GetDevice() const {
69 return m_pBitmapDevice ? m_pBitmapDevice.get() : m_pDevice.Get();
70 }
71
OutputToDevice()72 void CPDF_ScaledRenderBuffer::OutputToDevice() {
73 if (m_pBitmapDevice) {
74 m_pDevice->StretchDIBits(m_pBitmapDevice->GetBitmap(), m_Rect.left,
75 m_Rect.top, m_Rect.Width(), m_Rect.Height());
76 }
77 }
78