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// 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/logging.h"
CFX_ClipRgn::CFX_ClipRgn(int width, int height)
: m_Type(RectI), m_Box(0, 0, width, height) {}
CFX_ClipRgn::CFX_ClipRgn(const CFX_ClipRgn& src) {
m_Type = src.m_Type;
m_Box = src.m_Box;
m_Mask = src.m_Mask;
}
CFX_ClipRgn::~CFX_ClipRgn() {}
void CFX_ClipRgn::Reset(const FX_RECT& rect) {
m_Type = RectI;
m_Box = rect;
m_Mask = nullptr;
}
void CFX_ClipRgn::IntersectRect(const FX_RECT& rect) {
if (m_Type == RectI) {
m_Box.Intersect(rect);
return;
}
if (m_Type == MaskF) {
IntersectMaskRect(rect, m_Box, m_Mask);
return;
}
}
void CFX_ClipRgn::IntersectMaskRect(FX_RECT rect,
FX_RECT mask_rect,
const RetainPtr<CFX_DIBitmap>& pMask) {
m_Type = MaskF;
m_Box = rect;
m_Box.Intersect(mask_rect);
if (m_Box.IsEmpty()) {
m_Type = RectI;
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_8bppMask);
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);
uint8_t* src_scan =
pOldMask->GetBuffer() + pOldMask->GetPitch() * (row - mask_rect.top);
for (int col = m_Box.left; col < m_Box.right; col++)
dest_scan[col - m_Box.left] = src_scan[col - mask_rect.left];
}
}
void CFX_ClipRgn::IntersectMaskF(int left,
int top,
const RetainPtr<CFX_DIBitmap>& pMask) {
ASSERT(pMask->GetFormat() == FXDIB_8bppMask);
FX_RECT mask_box(left, top, left + pMask->GetWidth(),
top + pMask->GetHeight());
if (m_Type == RectI) {
IntersectMaskRect(m_Box, mask_box, pMask);
return;
}
if (m_Type == MaskF) {
FX_RECT new_box = m_Box;
new_box.Intersect(mask_box);
if (new_box.IsEmpty()) {
m_Type = RectI;
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_8bppMask);
for (int row = new_box.top; row < new_box.bottom; row++) {
uint8_t* old_scan =
m_Mask->GetBuffer() + (row - m_Box.top) * m_Mask->GetPitch();
uint8_t* mask_scan = pMask->GetBuffer() + (row - top) * pMask->GetPitch();
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);
return;
}
NOTREACHED();
}
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