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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/ge/cfx_cliprgn.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.Clear();
}
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,
CFX_DIBitmapRef Mask) {
const CFX_DIBitmap* mask_dib = Mask.GetObject();
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 = Mask;
return;
}
CFX_DIBitmap* new_dib = m_Mask.New();
if (!new_dib)
return;
new_dib->Create(m_Box.Width(), m_Box.Height(), FXDIB_8bppMask);
for (int row = m_Box.top; row < m_Box.bottom; row++) {
uint8_t* dest_scan =
new_dib->GetBuffer() + new_dib->GetPitch() * (row - m_Box.top);
uint8_t* src_scan =
mask_dib->GetBuffer() + mask_dib->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, CFX_DIBitmapRef Mask) {
const CFX_DIBitmap* mask_dib = Mask.GetObject();
ASSERT(mask_dib->GetFormat() == FXDIB_8bppMask);
FX_RECT mask_box(left, top, left + mask_dib->GetWidth(),
top + mask_dib->GetHeight());
if (m_Type == RectI) {
IntersectMaskRect(m_Box, mask_box, Mask);
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.Clear();
m_Box = new_box;
return;
}
CFX_DIBitmapRef new_mask;
CFX_DIBitmap* new_dib = new_mask.New();
if (!new_dib)
return;
new_dib->Create(new_box.Width(), new_box.Height(), FXDIB_8bppMask);
const CFX_DIBitmap* old_dib = m_Mask.GetObject();
for (int row = new_box.top; row < new_box.bottom; row++) {
uint8_t* old_scan =
old_dib->GetBuffer() + (row - m_Box.top) * old_dib->GetPitch();
uint8_t* mask_scan =
mask_dib->GetBuffer() + (row - top) * mask_dib->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 = new_mask;
return;
}
ASSERT(FALSE);
}
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