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// Copyright 2017 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/dib/cfx_bitmapcomposer.h"
#include <string.h>
#include "core/fxcrt/fx_2d_size.h"
#include "core/fxcrt/fx_coordinates.h"
#include "core/fxcrt/fx_safe_types.h"
#include "core/fxcrt/span_util.h"
#include "core/fxge/cfx_cliprgn.h"
#include "core/fxge/dib/cfx_dibitmap.h"
#include "third_party/base/check_op.h"
CFX_BitmapComposer::CFX_BitmapComposer() = default;
CFX_BitmapComposer::~CFX_BitmapComposer() = default;
void CFX_BitmapComposer::Compose(const 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,
BlendMode blend_mode) {
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::kRectI)
m_pClipMask = pClipRgn->GetMask();
m_bVertical = bVertical;
m_bFlipX = bFlipX;
m_bFlipY = bFlipY;
m_bRgbByteOrder = bRgbByteOrder;
m_BlendMode = blend_mode;
}
bool CFX_BitmapComposer::SetInfo(int width,
int height,
FXDIB_Format src_format,
pdfium::span<const uint32_t> src_palette) {
DCHECK_NE(src_format, FXDIB_Format::k1bppMask);
DCHECK_NE(src_format, FXDIB_Format::k1bppRgb);
m_SrcFormat = src_format;
if (!m_Compositor.Init(m_pBitmap->GetFormat(), src_format, src_palette,
m_MaskColor, m_BlendMode,
m_pClipMask != nullptr || (m_BitmapAlpha < 255),
m_bRgbByteOrder)) {
return false;
}
if (m_bVertical) {
m_pScanlineV.resize(m_pBitmap->GetBPP() / 8 * width + 4);
m_pClipScanV.resize(m_pBitmap->GetHeight());
}
if (m_BitmapAlpha < 255) {
m_pAddClipScan.resize(m_bVertical ? m_pBitmap->GetHeight()
: m_pBitmap->GetWidth());
}
return true;
}
void CFX_BitmapComposer::DoCompose(pdfium::span<uint8_t> dest_scan,
pdfium::span<const uint8_t> src_scan,
int dest_width,
pdfium::span<const uint8_t> clip_scan) {
if (m_BitmapAlpha < 255) {
if (!clip_scan.empty()) {
for (int i = 0; i < dest_width; ++i)
m_pAddClipScan[i] = clip_scan[i] * m_BitmapAlpha / 255;
} else {
fxcrt::spanset(pdfium::make_span(m_pAddClipScan).first(dest_width),
m_BitmapAlpha);
}
clip_scan = m_pAddClipScan;
}
if (m_SrcFormat == FXDIB_Format::k8bppMask) {
m_Compositor.CompositeByteMaskLine(dest_scan, src_scan, dest_width,
clip_scan);
} else if (m_SrcFormat == FXDIB_Format::k8bppRgb) {
m_Compositor.CompositePalBitmapLine(dest_scan, src_scan, 0, dest_width,
clip_scan);
} else {
m_Compositor.CompositeRgbBitmapLine(dest_scan, src_scan, dest_width,
clip_scan);
}
}
void CFX_BitmapComposer::ComposeScanline(int line,
pdfium::span<const uint8_t> scanline) {
if (m_bVertical) {
ComposeScanlineV(line, scanline);
return;
}
pdfium::span<const uint8_t> clip_scan;
if (m_pClipMask) {
clip_scan =
m_pClipMask
->GetWritableScanline(m_DestTop + line - m_pClipRgn->GetBox().top)
.subspan(m_DestLeft - m_pClipRgn->GetBox().left);
}
pdfium::span<uint8_t> dest_scan =
m_pBitmap->GetWritableScanline(line + m_DestTop);
if (!dest_scan.empty()) {
FX_SAFE_UINT32 offset = m_DestLeft;
offset *= m_pBitmap->GetBPP();
offset /= 8;
if (!offset.IsValid())
return;
dest_scan = dest_scan.subspan(offset.ValueOrDie());
}
DoCompose(dest_scan, scanline, m_DestWidth, clip_scan);
}
void CFX_BitmapComposer::ComposeScanlineV(
int line,
pdfium::span<const uint8_t> scanline) {
int Bpp = m_pBitmap->GetBPP() / 8;
int dest_pitch = m_pBitmap->GetPitch();
int dest_x = m_DestLeft + (m_bFlipX ? (m_DestWidth - line - 1) : line);
pdfium::span<uint8_t> dest_span = m_pBitmap->GetBuffer();
if (!dest_span.empty()) {
const size_t dest_x_offset = Fx2DSizeOrDie(dest_x, Bpp);
const size_t dest_y_offset = Fx2DSizeOrDie(m_DestTop, dest_pitch);
dest_span = dest_span.subspan(dest_y_offset).subspan(dest_x_offset);
if (m_bFlipY) {
const size_t dest_flip_offset =
Fx2DSizeOrDie(dest_pitch, m_DestHeight - 1);
dest_span = dest_span.subspan(dest_flip_offset);
}
}
uint8_t* dest_buf = dest_span.data();
const int y_step = m_bFlipY ? -dest_pitch : dest_pitch;
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;
}
pdfium::span<uint8_t> clip_scan;
if (m_pClipMask) {
clip_scan = m_pClipScanV;
int clip_pitch = m_pClipMask->GetPitch();
const uint8_t* src_clip =
m_pClipMask->GetScanline(m_DestTop - m_pClipRgn->GetBox().top)
.subspan(dest_x - m_pClipRgn->GetBox().left)
.data();
if (m_bFlipY) {
src_clip += Fx2DSizeOrDie(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, scanline, m_DestHeight, clip_scan);
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;
}
}
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