CFX_DIBitmap* CPDF_RenderStatus::GetBackdrop(const CPDF_PageObject* pObj,
const FX_RECT& rect,
int& left,
int& top,
FX_BOOL bBackAlphaRequired) {
FX_RECT bbox = rect;
bbox.Intersect(m_pDevice->GetClipBox());
left = bbox.left;
top = bbox.top;
CFX_Matrix deviceCTM = m_pDevice->GetCTM();
FX_FLOAT scaleX = FXSYS_fabs(deviceCTM.a);
FX_FLOAT scaleY = FXSYS_fabs(deviceCTM.d);
int width = FXSYS_round(bbox.Width() * scaleX);
int height = FXSYS_round(bbox.Height() * scaleY);
std::unique_ptr<CFX_DIBitmap> pBackdrop(new CFX_DIBitmap);
if (bBackAlphaRequired && !m_bDropObjects)
pBackdrop->Create(width, height, FXDIB_Argb);
else
m_pDevice->CreateCompatibleBitmap(pBackdrop.get(), width, height);
if (!pBackdrop->GetBuffer())
return nullptr;
FX_BOOL bNeedDraw;
if (pBackdrop->HasAlpha())
bNeedDraw = !(m_pDevice->GetRenderCaps() & FXRC_ALPHA_OUTPUT);
else
bNeedDraw = !(m_pDevice->GetRenderCaps() & FXRC_GET_BITS);
if (!bNeedDraw) {
m_pDevice->GetDIBits(pBackdrop.get(), left, top);
return pBackdrop.release();
}
CFX_Matrix FinalMatrix = m_DeviceMatrix;
FinalMatrix.TranslateI(-left, -top);
FinalMatrix.Scale(scaleX, scaleY);
pBackdrop->Clear(pBackdrop->HasAlpha() ? 0 : 0xffffffff);
CFX_FxgeDevice device;
device.Attach(pBackdrop.get(), false, nullptr, false);
m_pContext->Render(&device, pObj, &m_Options, &FinalMatrix);
return pBackdrop.release();
}
void CPDF_RenderStatus::CompositeDIBitmap(CFX_DIBitmap* pDIBitmap,
int left,
int top,
FX_ARGB mask_argb,
int bitmap_alpha,
int blend_mode,
int Transparency) {
if (pDIBitmap == NULL) {
return;
}
FX_BOOL bIsolated = Transparency & PDFTRANS_ISOLATED;
FX_BOOL bGroup = Transparency & PDFTRANS_GROUP;
if (blend_mode == FXDIB_BLEND_NORMAL) {
if (!pDIBitmap->IsAlphaMask()) {
if (bitmap_alpha < 255) {
pDIBitmap->MultiplyAlpha(bitmap_alpha);
}
if (m_pDevice->SetDIBits(pDIBitmap, left, top)) {
return;
}
} else {
FX_DWORD fill_argb = m_Options.TranslateColor(mask_argb);
if (bitmap_alpha < 255) {
((uint8_t*)&fill_argb)[3] =
((uint8_t*)&fill_argb)[3] * bitmap_alpha / 255;
}
if (m_pDevice->SetBitMask(pDIBitmap, left, top, fill_argb)) {
return;
}
}
}
FX_BOOL bBackAlphaRequired = blend_mode && bIsolated && !m_bDropObjects;
FX_BOOL bGetBackGround =
((m_pDevice->GetRenderCaps() & FXRC_ALPHA_OUTPUT)) ||
(!(m_pDevice->GetRenderCaps() & FXRC_ALPHA_OUTPUT) &&
(m_pDevice->GetRenderCaps() & FXRC_GET_BITS) && !bBackAlphaRequired);
if (bGetBackGround) {
if (bIsolated || !bGroup) {
if (pDIBitmap->IsAlphaMask()) {
return;
}
m_pDevice->SetDIBits(pDIBitmap, left, top, blend_mode);
} else {
FX_RECT rect(left, top, left + pDIBitmap->GetWidth(),
top + pDIBitmap->GetHeight());
rect.Intersect(m_pDevice->GetClipBox());
CFX_DIBitmap* pClone = NULL;
FX_BOOL bClone = FALSE;
if (m_pDevice->GetBackDrop() && m_pDevice->GetBitmap()) {
bClone = TRUE;
pClone = m_pDevice->GetBackDrop()->Clone(&rect);
CFX_DIBitmap* pForeBitmap = m_pDevice->GetBitmap();
pClone->CompositeBitmap(0, 0, pClone->GetWidth(), pClone->GetHeight(),
pForeBitmap, rect.left, rect.top);
left = left >= 0 ? 0 : left;
top = top >= 0 ? 0 : top;
if (!pDIBitmap->IsAlphaMask())
pClone->CompositeBitmap(0, 0, pClone->GetWidth(), pClone->GetHeight(),
pDIBitmap, left, top, blend_mode);
else
pClone->CompositeMask(0, 0, pClone->GetWidth(), pClone->GetHeight(),
pDIBitmap, mask_argb, left, top, blend_mode);
} else {
pClone = pDIBitmap;
}
if (m_pDevice->GetBackDrop()) {
m_pDevice->SetDIBits(pClone, rect.left, rect.top);
} else {
if (pDIBitmap->IsAlphaMask()) {
return;
}
m_pDevice->SetDIBits(pDIBitmap, rect.left, rect.top, blend_mode);
}
if (bClone) {
delete pClone;
}
}
return;
}
int back_left, back_top;
FX_RECT rect(left, top, left + pDIBitmap->GetWidth(),
top + pDIBitmap->GetHeight());
nonstd::unique_ptr<CFX_DIBitmap> pBackdrop(
GetBackdrop(m_pCurObj, rect, back_left, back_top,
blend_mode > FXDIB_BLEND_NORMAL && bIsolated));
if (!pBackdrop)
return;
if (!pDIBitmap->IsAlphaMask()) {
pBackdrop->CompositeBitmap(left - back_left, top - back_top,
pDIBitmap->GetWidth(), pDIBitmap->GetHeight(),
pDIBitmap, 0, 0, blend_mode);
} else {
pBackdrop->CompositeMask(left - back_left, top - back_top,
pDIBitmap->GetWidth(), pDIBitmap->GetHeight(),
pDIBitmap, mask_argb, 0, 0, blend_mode);
}
nonstd::unique_ptr<CFX_DIBitmap> pBackdrop1(new CFX_DIBitmap);
pBackdrop1->Create(pBackdrop->GetWidth(), pBackdrop->GetHeight(),
FXDIB_Rgb32);
pBackdrop1->Clear((FX_DWORD)-1);
pBackdrop1->CompositeBitmap(0, 0, pBackdrop->GetWidth(),
pBackdrop->GetHeight(), pBackdrop.get(), 0, 0);
pBackdrop = nonstd::move(pBackdrop1);
m_pDevice->SetDIBits(pBackdrop.get(), back_left, back_top);
}
