/* And the real drawing loop: */
void CairoDrawLoop(HWND hwndClientWindow,
int iWidth,
int iHeight,
cairo_surface_t *pCairoSurface,
cairo_t *pCairoHandle)
{
double dRandMax;
unsigned int uiLoopCounter = 0;
NewsItem_p pCurrItem;
// Initialize random number generator
srand(clock());
dRandMax = RAND_MAX;
// Clear background with black
cairo_set_source_rgb (pCairoHandle, 0, 0 ,0);
cairo_rectangle (pCairoHandle,
0, 0,
iWidth, iHeight);
cairo_fill(pCairoHandle);
// Calculate screen aspect ratio
if (iWidth<iHeight)
{
iUniSize = iWidth;
dYAspect = iHeight;
dYAspect /= iWidth;
dXAspect = 1;
}
else
{
iUniSize = iHeight;
dXAspect = iWidth;
dXAspect /= iHeight;
dYAspect = 1;
}
// --------------------------------
// Show info that we're downloading the feed
cairo_save(pCairoHandle);
cairo_scale(pCairoHandle, iUniSize, iUniSize);
ShowInfo("Downloading",
achRSSURL,
hwndClientWindow,
pCairoSurface, pCairoHandle);
cairo_restore(pCairoHandle);
WinInvalidateRect(hwndClientWindow, NULL, TRUE);
// --------------------------------
// Download the URL and parse it with libXML
pNewsListHead = NULL;
DownloadXML(achRSSURL, &pNewsListHead);
pCurrItem = pNewsListHead;
// --------------------------------
// Do the main drawing loop as long as needed!
while (!bShutdownDrawing)
{
if (bPauseDrawing)
{
// Do not draw anything if we're paused!
DosSleep(250);
}
else
{
// Otherwise draw something!
if (!pNewsListHead)
{
if (uiLoopCounter==0)
{
// Save cairo canvas state
cairo_save(pCairoHandle);
// Scale canvas so we'll have a
// normalized coordinate system of (0;0) -> (1;1)
cairo_scale(pCairoHandle, iUniSize, iUniSize);
// Clear background with black
cairo_set_source_rgb(pCairoHandle, 0, 0 ,0);
cairo_rectangle(pCairoHandle,
0, 0,
dXAspect, dYAspect);
cairo_fill(pCairoHandle);
ShowInfo("Error downloading",
achRSSURL,
hwndClientWindow,
pCairoSurface, pCairoHandle);
// Restore canvas state to original one
cairo_restore(pCairoHandle);
WinInvalidateRect(hwndClientWindow, NULL, TRUE);
} else
if (uiLoopCounter==10)
{
// Save cairo canvas state
cairo_save(pCairoHandle);
// Scale canvas so we'll have a
// normalized coordinate system of (0;0) -> (1;1)
cairo_scale(pCairoHandle, iUniSize, iUniSize);
// Clear background with black
cairo_set_source_rgb(pCairoHandle, 0, 0 ,0);
cairo_rectangle(pCairoHandle,
0, 0,
dXAspect, dYAspect);
cairo_fill(pCairoHandle);
cairo_os2_surface_paint_window(pCairoSurface,
NULL,
NULL,
1);
// Restore canvas state to original one
cairo_restore(pCairoHandle);
WinInvalidateRect(hwndClientWindow, NULL, TRUE);
}
if (uiLoopCounter<20)
uiLoopCounter++;
else
uiLoopCounter = 0;
} else
{
if (uiLoopCounter % 150 == 0)
{
// Save cairo canvas state
cairo_save(pCairoHandle);
// Scale canvas so we'll have a
// normalized coordinate system of (0;0) -> (1;1)
cairo_scale(pCairoHandle, iUniSize, iUniSize);
// Clear background with black
cairo_set_source_rgb(pCairoHandle, 0, 0 ,0);
cairo_rectangle(pCairoHandle,
0, 0,
dXAspect, dYAspect);
cairo_fill(pCairoHandle);
if (pCurrItem)
VisualizeXML(pCurrItem,
pCairoHandle);
// Restore canvas state to original one
cairo_restore(pCairoHandle);
WinInvalidateRect(hwndClientWindow, NULL, TRUE);
// Go for next news item then.
if (pCurrItem)
{
pCurrItem = pCurrItem->pNext;
if (!pCurrItem)
pCurrItem = pNewsListHead;
}
}
uiLoopCounter++;
}
}
DosSleep(30); // Wait some
}
// Got shutdown event, so stopped drawing. That's all.
// Clean up
FreeNewsData(&pNewsListHead);
}
void gfxOS2Surface::Refresh(RECTL *aRect, int aCount, HPS aPS)
{
if (mSurfType == os2Window)
cairo_os2_surface_paint_window((cairo_os2_surface_t*)CairoSurface(),
(aPS ? aPS : mPS), aRect, aCount);
}