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// Copyright 2016 The PDFium Authors
// 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 <string.h>
#include <utility>
#include "core/fxcrt/span_util.h"
#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,
RetainPtr<CFX_DIBitmap> pOldMask) {
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 = std::move(pOldMask);
return;
}
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++) {
pdfium::span<uint8_t> dest_scan =
m_Mask->GetWritableScanline(row - m_Box.top);
pdfium::span<const uint8_t> src_scan =
pOldMask->GetScanline(row - mask_rect.top);
fxcrt::spancpy(dest_scan, src_scan.subspan(offset, m_Box.Width()));
}
}
void CFX_ClipRgn::IntersectMaskF(int left,
int top,
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, std::move(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++) {
pdfium::span<const uint8_t> old_scan = m_Mask->GetScanline(row - m_Box.top);
pdfium::span<const uint8_t> mask_scan = pMask->GetScanline(row - top);
uint8_t* new_scan = new_dib->GetWritableScanline(row - new_box.top).data();
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);
}
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