void Render(HDC hdc, RectI target, int pageNo, float zoom) {
ScopedCritSec scope(&currAccess);
if (currBmp && currPage == pageNo && currSize == target.Size())
currBmp->StretchDIBits(hdc, target);
else if (!thread) {
reqPage = pageNo;
reqZoom = zoom;
reqSize = target.Size();
thread = CreateThread(NULL, 0, RenderThread, this, 0, 0);
}
}
void Render(HDC hdc, RectI target, int pageNo, float zoom) {
ScopedCritSec scope(&currAccess);
if (currBmp && currPage == pageNo && currSize == target.Size())
currBmp->StretchDIBits(hdc, target);
else if (!thread) {
reqPage = pageNo;
reqZoom = zoom;
reqSize = target.Size();
reqAbort = false;
thread = CreateThread(NULL, 0, RenderThread, this, 0, 0);
}
else if (reqPage != pageNo || reqSize != target.Size()) {
if (abortCookie)
abortCookie->Abort();
reqAbort = true;
}
}
RenderedBitmap *DjVuEngineImpl::RenderBitmap(int pageNo, float zoom, int rotation, RectD *pageRect, RenderTarget target, AbortCookie **cookie_out)
{
ScopedCritSec scope(&gDjVuContext.lock);
RectD pageRc = pageRect ? *pageRect : PageMediabox(pageNo);
RectI screen = Transform(pageRc, pageNo, zoom, rotation).Round();
RectI full = Transform(PageMediabox(pageNo), pageNo, zoom, rotation).Round();
screen = full.Intersect(screen);
ddjvu_page_t *page = ddjvu_page_create_by_pageno(doc, pageNo-1);
if (!page)
return NULL;
int rotation4 = (((-rotation / 90) % 4) + 4) % 4;
ddjvu_page_set_rotation(page, (ddjvu_page_rotation_t)rotation4);
while (!ddjvu_page_decoding_done(page))
gDjVuContext.SpinMessageLoop();
if (ddjvu_page_decoding_error(page))
return NULL;
bool isBitonal = DDJVU_PAGETYPE_BITONAL == ddjvu_page_get_type(page);
ddjvu_format_t *fmt = ddjvu_format_create(isBitonal ? DDJVU_FORMAT_GREY8 : DDJVU_FORMAT_BGR24, 0, NULL);
ddjvu_format_set_row_order(fmt, /* top_to_bottom */ TRUE);
ddjvu_rect_t prect = { full.x, full.y, full.dx, full.dy };
ddjvu_rect_t rrect = { screen.x, 2 * full.y - screen.y + full.dy - screen.dy, screen.dx, screen.dy };
RenderedBitmap *bmp = NULL;
int stride = ((screen.dx * (isBitonal ? 1 : 3) + 3) / 4) * 4;
ScopedMem<char> bmpData(AllocArray<char>(stride * (screen.dy + 5)));
if (bmpData) {
#ifndef DEBUG
ddjvu_render_mode_t mode = isBitonal ? DDJVU_RENDER_MASKONLY : DDJVU_RENDER_COLOR;
#else
// TODO: there seems to be a heap corruption in IW44Image.cpp
// in debug builds when passing in DDJVU_RENDER_COLOR
ddjvu_render_mode_t mode = DDJVU_RENDER_MASKONLY;
#endif
if (ddjvu_page_render(page, mode, &prect, &rrect, fmt, stride, bmpData.Get())) {
bmp = new RenderedDjVuPixmap(bmpData, screen.Size(), isBitonal);
AddUserAnnots(bmp, pageNo, zoom, rotation, screen);
}
}
ddjvu_format_release(fmt);
ddjvu_page_release(page);
return bmp;
}
void EnsureAreaVisibility(RectI& r)
{
// adjust to the work-area of the current monitor (not necessarily the primary one)
RectI work = GetWorkAreaRect(r);
// make sure that the window is neither too small nor bigger than the monitor
if (r.dx < MIN_WIN_DX || r.dx > work.dx)
r.dx = (int)min(work.dy * DEF_PAGE_RATIO, work.dx);
if (r.dy < MIN_WIN_DY || r.dy > work.dy)
r.dy = work.dy;
// check whether the lower half of the window's title bar is
// inside a visible working area
int captionDy = GetSystemMetrics(SM_CYCAPTION);
RectI halfCaption(r.x, r.y + captionDy / 2, r.dx, captionDy / 2);
if (halfCaption.Intersect(work).IsEmpty())
r = RectI(work.TL(), r.Size());
}
RenderedBitmap *ImagesEngine::RenderBitmap(int pageNo, float zoom, int rotation, RectD *pageRect, RenderTarget target, AbortCookie **cookie_out)
{
RectD pageRc = pageRect ? *pageRect : PageMediabox(pageNo);
RectI screen = Transform(pageRc, pageNo, zoom, rotation).Round();
screen.Offset(-screen.x, -screen.y);
HDC hDC = GetDC(NULL);
HDC hDCMem = CreateCompatibleDC(hDC);
HBITMAP hbmp = CreateCompatibleBitmap(hDC, screen.dx, screen.dy);
DeleteObject(SelectObject(hDCMem, hbmp));
bool ok = RenderPage(hDCMem, screen, pageNo, zoom, rotation, pageRect, target, cookie_out);
DeleteDC(hDCMem);
ReleaseDC(NULL, hDC);
if (!ok) {
DeleteObject(hbmp);
return NULL;
}
return new RenderedBitmap(hbmp, screen.Size());
}
