| // Copyright 2016 PDFium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com |
| |
| #include "core/fxge/cfx_cliprgn.h" |
| |
| #include <utility> |
| |
| #include "core/fxge/dib/cfx_dibitmap.h" |
| #include "third_party/base/check_op.h" |
| #include "third_party/base/notreached.h" |
| |
| CFX_ClipRgn::CFX_ClipRgn(int width, int height) : m_Box(0, 0, width, height) {} |
| |
| CFX_ClipRgn::CFX_ClipRgn(const CFX_ClipRgn& src) = default; |
| |
| CFX_ClipRgn::~CFX_ClipRgn() = default; |
| |
| void CFX_ClipRgn::IntersectRect(const FX_RECT& rect) { |
| if (m_Type == kRectI) { |
| m_Box.Intersect(rect); |
| return; |
| } |
| IntersectMaskRect(rect, m_Box, m_Mask); |
| } |
| |
| void CFX_ClipRgn::IntersectMaskRect(FX_RECT rect, |
| FX_RECT mask_rect, |
| const RetainPtr<CFX_DIBitmap>& pMask) { |
| m_Type = kMaskF; |
| m_Box = rect; |
| m_Box.Intersect(mask_rect); |
| if (m_Box.IsEmpty()) { |
| m_Type = kRectI; |
| return; |
| } |
| if (m_Box == mask_rect) { |
| m_Mask = pMask; |
| return; |
| } |
| RetainPtr<CFX_DIBitmap> pOldMask(pMask); |
| m_Mask = pdfium::MakeRetain<CFX_DIBitmap>(); |
| m_Mask->Create(m_Box.Width(), m_Box.Height(), FXDIB_Format::k8bppMask); |
| const int offset = m_Box.left - mask_rect.left; |
| for (int row = m_Box.top; row < m_Box.bottom; row++) { |
| uint8_t* dest_scan = |
| m_Mask->GetBuffer() + m_Mask->GetPitch() * (row - m_Box.top); |
| const uint8_t* src_scan = pOldMask->GetScanline(row - mask_rect.top); |
| memcpy(dest_scan, &src_scan[offset], m_Box.Width()); |
| } |
| } |
| |
| void CFX_ClipRgn::IntersectMaskF(int left, |
| int top, |
| const RetainPtr<CFX_DIBitmap>& pMask) { |
| DCHECK_EQ(pMask->GetFormat(), FXDIB_Format::k8bppMask); |
| FX_RECT mask_box(left, top, left + pMask->GetWidth(), |
| top + pMask->GetHeight()); |
| if (m_Type == kRectI) { |
| IntersectMaskRect(m_Box, mask_box, pMask); |
| return; |
| } |
| |
| FX_RECT new_box = m_Box; |
| new_box.Intersect(mask_box); |
| if (new_box.IsEmpty()) { |
| m_Type = kRectI; |
| m_Mask = nullptr; |
| m_Box = new_box; |
| return; |
| } |
| auto new_dib = pdfium::MakeRetain<CFX_DIBitmap>(); |
| new_dib->Create(new_box.Width(), new_box.Height(), FXDIB_Format::k8bppMask); |
| for (int row = new_box.top; row < new_box.bottom; row++) { |
| const uint8_t* old_scan = m_Mask->GetScanline(row - m_Box.top); |
| const uint8_t* mask_scan = pMask->GetScanline(row - top); |
| uint8_t* new_scan = |
| new_dib->GetBuffer() + (row - new_box.top) * new_dib->GetPitch(); |
| for (int col = new_box.left; col < new_box.right; col++) { |
| new_scan[col - new_box.left] = |
| old_scan[col - m_Box.left] * mask_scan[col - left] / 255; |
| } |
| } |
| m_Box = new_box; |
| m_Mask = std::move(new_dib); |
| } |