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/notreached.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
17 CFX_ClipRgn::CFX_ClipRgn(const CFX_ClipRgn& src) = default;
18
19 CFX_ClipRgn::~CFX_ClipRgn() = default;
20
IntersectRect(const FX_RECT & rect)21 void CFX_ClipRgn::IntersectRect(const FX_RECT& rect) {
22 if (m_Type == RectI) {
23 m_Box.Intersect(rect);
24 return;
25 }
26 if (m_Type == MaskF) {
27 IntersectMaskRect(rect, m_Box, m_Mask);
28 return;
29 }
30 }
31
IntersectMaskRect(FX_RECT rect,FX_RECT mask_rect,const RetainPtr<CFX_DIBitmap> & pMask)32 void CFX_ClipRgn::IntersectMaskRect(FX_RECT rect,
33 FX_RECT mask_rect,
34 const RetainPtr<CFX_DIBitmap>& pMask) {
35 m_Type = MaskF;
36 m_Box = rect;
37 m_Box.Intersect(mask_rect);
38 if (m_Box.IsEmpty()) {
39 m_Type = RectI;
40 return;
41 }
42 if (m_Box == mask_rect) {
43 m_Mask = pMask;
44 return;
45 }
46 RetainPtr<CFX_DIBitmap> pOldMask(pMask);
47 m_Mask = pdfium::MakeRetain<CFX_DIBitmap>();
48 m_Mask->Create(m_Box.Width(), m_Box.Height(), FXDIB_Format::k8bppMask);
49 for (int row = m_Box.top; row < m_Box.bottom; row++) {
50 uint8_t* dest_scan =
51 m_Mask->GetBuffer() + m_Mask->GetPitch() * (row - m_Box.top);
52 uint8_t* src_scan =
53 pOldMask->GetBuffer() + pOldMask->GetPitch() * (row - mask_rect.top);
54 for (int col = m_Box.left; col < m_Box.right; col++)
55 dest_scan[col - m_Box.left] = src_scan[col - mask_rect.left];
56 }
57 }
58
IntersectMaskF(int left,int top,const RetainPtr<CFX_DIBitmap> & pMask)59 void CFX_ClipRgn::IntersectMaskF(int left,
60 int top,
61 const RetainPtr<CFX_DIBitmap>& pMask) {
62 ASSERT(pMask->GetFormat() == FXDIB_Format::k8bppMask);
63 FX_RECT mask_box(left, top, left + pMask->GetWidth(),
64 top + pMask->GetHeight());
65 if (m_Type == RectI) {
66 IntersectMaskRect(m_Box, mask_box, pMask);
67 return;
68 }
69 if (m_Type == MaskF) {
70 FX_RECT new_box = m_Box;
71 new_box.Intersect(mask_box);
72 if (new_box.IsEmpty()) {
73 m_Type = RectI;
74 m_Mask = nullptr;
75 m_Box = new_box;
76 return;
77 }
78 auto new_dib = pdfium::MakeRetain<CFX_DIBitmap>();
79 new_dib->Create(new_box.Width(), new_box.Height(), FXDIB_Format::k8bppMask);
80 for (int row = new_box.top; row < new_box.bottom; row++) {
81 uint8_t* old_scan =
82 m_Mask->GetBuffer() + (row - m_Box.top) * m_Mask->GetPitch();
83 uint8_t* mask_scan = pMask->GetBuffer() + (row - top) * pMask->GetPitch();
84 uint8_t* new_scan =
85 new_dib->GetBuffer() + (row - new_box.top) * new_dib->GetPitch();
86 for (int col = new_box.left; col < new_box.right; col++) {
87 new_scan[col - new_box.left] =
88 old_scan[col - m_Box.left] * mask_scan[col - left] / 255;
89 }
90 }
91 m_Box = new_box;
92 m_Mask = std::move(new_dib);
93 return;
94 }
95 NOTREACHED();
96 }
97