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// Copyright 2017 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/dib/cfx_bitmapcomposer.h"
#include "core/fxge/cfx_cliprgn.h"
#include "core/fxge/dib/cfx_dibitmap.h"
CFX_BitmapComposer::CFX_BitmapComposer()
: m_bRgbByteOrder(false), m_BlendType(FXDIB_BLEND_NORMAL) {}
CFX_BitmapComposer::~CFX_BitmapComposer() {}
void CFX_BitmapComposer::Compose(const CFX_RetainPtr<CFX_DIBitmap>& pDest,
const CFX_ClipRgn* pClipRgn,
int bitmap_alpha,
uint32_t mask_color,
const FX_RECT& dest_rect,
bool bVertical,
bool bFlipX,
bool bFlipY,
bool bRgbByteOrder,
int alpha_flag,
int blend_type) {
m_pBitmap = pDest;
m_pClipRgn = pClipRgn;
m_DestLeft = dest_rect.left;
m_DestTop = dest_rect.top;
m_DestWidth = dest_rect.Width();
m_DestHeight = dest_rect.Height();
m_BitmapAlpha = bitmap_alpha;
m_MaskColor = mask_color;
m_pClipMask = nullptr;
if (pClipRgn && pClipRgn->GetType() != CFX_ClipRgn::RectI)
m_pClipMask = pClipRgn->GetMask();
m_bVertical = bVertical;
m_bFlipX = bFlipX;
m_bFlipY = bFlipY;
m_AlphaFlag = alpha_flag;
m_bRgbByteOrder = bRgbByteOrder;
m_BlendType = blend_type;
}
bool CFX_BitmapComposer::SetInfo(int width,
int height,
FXDIB_Format src_format,
uint32_t* pSrcPalette) {
m_SrcFormat = src_format;
if (!m_Compositor.Init(m_pBitmap->GetFormat(), src_format, width, pSrcPalette,
m_MaskColor, FXDIB_BLEND_NORMAL,
m_pClipMask != nullptr || (m_BitmapAlpha < 255),
m_bRgbByteOrder, m_AlphaFlag)) {
return false;
}
if (m_bVertical) {
m_pScanlineV.resize(m_pBitmap->GetBPP() / 8 * width + 4);
m_pClipScanV.resize(m_pBitmap->GetHeight());
if (m_pBitmap->m_pAlphaMask)
m_pScanlineAlphaV.resize(width + 4);
}
if (m_BitmapAlpha < 255) {
m_pAddClipScan.resize(m_bVertical ? m_pBitmap->GetHeight()
: m_pBitmap->GetWidth());
}
return true;
}
void CFX_BitmapComposer::DoCompose(uint8_t* dest_scan,
const uint8_t* src_scan,
int dest_width,
const uint8_t* clip_scan,
const uint8_t* src_extra_alpha,
uint8_t* dst_extra_alpha) {
uint8_t* pAddClipScan = m_pAddClipScan.data();
if (m_BitmapAlpha < 255) {
if (clip_scan) {
for (int i = 0; i < dest_width; ++i)
pAddClipScan[i] = clip_scan[i] * m_BitmapAlpha / 255;
} else {
memset(pAddClipScan, m_BitmapAlpha, dest_width);
}
clip_scan = pAddClipScan;
}
if (m_SrcFormat == FXDIB_8bppMask) {
m_Compositor.CompositeByteMaskLine(dest_scan, src_scan, dest_width,
clip_scan, dst_extra_alpha);
} else if ((m_SrcFormat & 0xff) == 8) {
m_Compositor.CompositePalBitmapLine(dest_scan, src_scan, 0, dest_width,
clip_scan, src_extra_alpha,
dst_extra_alpha);
} else {
m_Compositor.CompositeRgbBitmapLine(dest_scan, src_scan, dest_width,
clip_scan, src_extra_alpha,
dst_extra_alpha);
}
}
void CFX_BitmapComposer::ComposeScanline(int line,
const uint8_t* scanline,
const uint8_t* scan_extra_alpha) {
if (m_bVertical) {
ComposeScanlineV(line, scanline, scan_extra_alpha);
return;
}
const uint8_t* clip_scan = nullptr;
if (m_pClipMask) {
clip_scan = m_pClipMask->GetBuffer() +
(m_DestTop + line - m_pClipRgn->GetBox().top) *
m_pClipMask->GetPitch() +
(m_DestLeft - m_pClipRgn->GetBox().left);
}
uint8_t* dest_scan =
const_cast<uint8_t*>(m_pBitmap->GetScanline(line + m_DestTop)) +
m_DestLeft * m_pBitmap->GetBPP() / 8;
uint8_t* dest_alpha_scan =
m_pBitmap->m_pAlphaMask
? const_cast<uint8_t*>(
m_pBitmap->m_pAlphaMask->GetScanline(line + m_DestTop)) +
m_DestLeft
: nullptr;
DoCompose(dest_scan, scanline, m_DestWidth, clip_scan, scan_extra_alpha,
dest_alpha_scan);
}
void CFX_BitmapComposer::ComposeScanlineV(int line,
const uint8_t* scanline,
const uint8_t* scan_extra_alpha) {
int Bpp = m_pBitmap->GetBPP() / 8;
int dest_pitch = m_pBitmap->GetPitch();
int dest_alpha_pitch =
m_pBitmap->m_pAlphaMask ? m_pBitmap->m_pAlphaMask->GetPitch() : 0;
int dest_x = m_DestLeft + (m_bFlipX ? (m_DestWidth - line - 1) : line);
uint8_t* dest_buf =
m_pBitmap->GetBuffer() + dest_x * Bpp + m_DestTop * dest_pitch;
uint8_t* dest_alpha_buf = m_pBitmap->m_pAlphaMask
? m_pBitmap->m_pAlphaMask->GetBuffer() +
dest_x + m_DestTop * dest_alpha_pitch
: nullptr;
if (m_bFlipY) {
dest_buf += dest_pitch * (m_DestHeight - 1);
dest_alpha_buf += dest_alpha_pitch * (m_DestHeight - 1);
}
int y_step = dest_pitch;
int y_alpha_step = dest_alpha_pitch;
if (m_bFlipY) {
y_step = -y_step;
y_alpha_step = -y_alpha_step;
}
uint8_t* src_scan = m_pScanlineV.data();
uint8_t* dest_scan = dest_buf;
for (int i = 0; i < m_DestHeight; ++i) {
for (int j = 0; j < Bpp; ++j)
*src_scan++ = dest_scan[j];
dest_scan += y_step;
}
uint8_t* src_alpha_scan = m_pScanlineAlphaV.data();
uint8_t* dest_alpha_scan = dest_alpha_buf;
if (dest_alpha_scan) {
for (int i = 0; i < m_DestHeight; ++i) {
*src_alpha_scan++ = *dest_alpha_scan;
dest_alpha_scan += y_alpha_step;
}
}
uint8_t* clip_scan = nullptr;
if (m_pClipMask) {
clip_scan = m_pClipScanV.data();
int clip_pitch = m_pClipMask->GetPitch();
const uint8_t* src_clip =
m_pClipMask->GetBuffer() +
(m_DestTop - m_pClipRgn->GetBox().top) * clip_pitch +
(dest_x - m_pClipRgn->GetBox().left);
if (m_bFlipY) {
src_clip += clip_pitch * (m_DestHeight - 1);
clip_pitch = -clip_pitch;
}
for (int i = 0; i < m_DestHeight; ++i) {
clip_scan[i] = *src_clip;
src_clip += clip_pitch;
}
}
DoCompose(m_pScanlineV.data(), scanline, m_DestHeight, clip_scan,
scan_extra_alpha, m_pScanlineAlphaV.data());
src_scan = m_pScanlineV.data();
dest_scan = dest_buf;
for (int i = 0; i < m_DestHeight; ++i) {
for (int j = 0; j < Bpp; ++j)
dest_scan[j] = *src_scan++;
dest_scan += y_step;
}
src_alpha_scan = m_pScanlineAlphaV.data();
dest_alpha_scan = dest_alpha_buf;
if (!dest_alpha_scan)
return;
for (int i = 0; i < m_DestHeight; ++i) {
*dest_alpha_scan = *src_alpha_scan++;
dest_alpha_scan += y_alpha_step;
}
}
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