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/fxge/cfx_cliprgn.h"
8
9 #include <utility>
10
11 #include "core/fxge/dib/cfx_dibitmap.h"
12 #include "third_party/base/logging.h"
13
CFX_ClipRgn(int width,int height)14 CFX_ClipRgn::CFX_ClipRgn(int width, int height)
15 : m_Type(RectI), m_Box(0, 0, width, height) {}
16
CFX_ClipRgn(const CFX_ClipRgn & src)17 CFX_ClipRgn::CFX_ClipRgn(const CFX_ClipRgn& src) {
18 m_Type = src.m_Type;
19 m_Box = src.m_Box;
20 m_Mask = src.m_Mask;
21 }
22
~CFX_ClipRgn()23 CFX_ClipRgn::~CFX_ClipRgn() {}
24
Reset(const FX_RECT & rect)25 void CFX_ClipRgn::Reset(const FX_RECT& rect) {
26 m_Type = RectI;
27 m_Box = rect;
28 m_Mask = nullptr;
29 }
30
IntersectRect(const FX_RECT & rect)31 void CFX_ClipRgn::IntersectRect(const FX_RECT& rect) {
32 if (m_Type == RectI) {
33 m_Box.Intersect(rect);
34 return;
35 }
36 if (m_Type == MaskF) {
37 IntersectMaskRect(rect, m_Box, m_Mask);
38 return;
39 }
40 }
41
IntersectMaskRect(FX_RECT rect,FX_RECT mask_rect,const RetainPtr<CFX_DIBitmap> & pMask)42 void CFX_ClipRgn::IntersectMaskRect(FX_RECT rect,
43 FX_RECT mask_rect,
44 const RetainPtr<CFX_DIBitmap>& pMask) {
45 m_Type = MaskF;
46 m_Box = rect;
47 m_Box.Intersect(mask_rect);
48 if (m_Box.IsEmpty()) {
49 m_Type = RectI;
50 return;
51 }
52 if (m_Box == mask_rect) {
53 m_Mask = pMask;
54 return;
55 }
56 RetainPtr<CFX_DIBitmap> pOldMask(pMask);
57 m_Mask = pdfium::MakeRetain<CFX_DIBitmap>();
58 m_Mask->Create(m_Box.Width(), m_Box.Height(), FXDIB_8bppMask);
59 for (int row = m_Box.top; row < m_Box.bottom; row++) {
60 uint8_t* dest_scan =
61 m_Mask->GetBuffer() + m_Mask->GetPitch() * (row - m_Box.top);
62 uint8_t* src_scan =
63 pOldMask->GetBuffer() + pOldMask->GetPitch() * (row - mask_rect.top);
64 for (int col = m_Box.left; col < m_Box.right; col++)
65 dest_scan[col - m_Box.left] = src_scan[col - mask_rect.left];
66 }
67 }
68
IntersectMaskF(int left,int top,const RetainPtr<CFX_DIBitmap> & pMask)69 void CFX_ClipRgn::IntersectMaskF(int left,
70 int top,
71 const RetainPtr<CFX_DIBitmap>& pMask) {
72 ASSERT(pMask->GetFormat() == FXDIB_8bppMask);
73 FX_RECT mask_box(left, top, left + pMask->GetWidth(),
74 top + pMask->GetHeight());
75 if (m_Type == RectI) {
76 IntersectMaskRect(m_Box, mask_box, pMask);
77 return;
78 }
79 if (m_Type == MaskF) {
80 FX_RECT new_box = m_Box;
81 new_box.Intersect(mask_box);
82 if (new_box.IsEmpty()) {
83 m_Type = RectI;
84 m_Mask = nullptr;
85 m_Box = new_box;
86 return;
87 }
88 auto new_dib = pdfium::MakeRetain<CFX_DIBitmap>();
89 new_dib->Create(new_box.Width(), new_box.Height(), FXDIB_8bppMask);
90 for (int row = new_box.top; row < new_box.bottom; row++) {
91 uint8_t* old_scan =
92 m_Mask->GetBuffer() + (row - m_Box.top) * m_Mask->GetPitch();
93 uint8_t* mask_scan = pMask->GetBuffer() + (row - top) * pMask->GetPitch();
94 uint8_t* new_scan =
95 new_dib->GetBuffer() + (row - new_box.top) * new_dib->GetPitch();
96 for (int col = new_box.left; col < new_box.right; col++) {
97 new_scan[col - new_box.left] =
98 old_scan[col - m_Box.left] * mask_scan[col - left] / 255;
99 }
100 }
101 m_Box = new_box;
102 m_Mask = std::move(new_dib);
103 return;
104 }
105 NOTREACHED();
106 }
107