| 1801 | // for a specific monitor on a multi monitor system |
| 1802 | |
| 1803 | HRESULT CImagePalette::PreparePalette(const CMediaType *pmtNew, const CMediaType *pmtOld, __in LPSTR szDevice) |
| 1804 | { |
| 1805 | const VIDEOINFOHEADER *pNewInfo = (VIDEOINFOHEADER *)pmtNew->Format(); |
| 1806 | const VIDEOINFOHEADER *pOldInfo = (VIDEOINFOHEADER *)pmtOld->Format(); |
| 1807 | ASSERT(pNewInfo); |
| 1808 | |
| 1809 | // This is an performance optimisation, when we get a media type we check |
| 1810 | // to see if the format requires a palette change. If either we need one |
| 1811 | // when previously we didn't or vica versa then this returns TRUE, if we |
| 1812 | // previously needed a palette and we do now it compares their colours |
| 1813 | |
| 1814 | if (ShouldUpdate(pNewInfo, pOldInfo) == FALSE) |
| 1815 | { |
| 1816 | NOTE("No update needed"); |
| 1817 | return S_FALSE; |
| 1818 | } |
| 1819 | |
| 1820 | // We must notify the filter graph that the application may have changed |
| 1821 | // the palette although in practice we don't bother checking to see if it |
| 1822 | // is really different. If it tries to get the palette either the window |
| 1823 | // or renderer lock will ensure it doesn't get in until we are finished |
| 1824 | |
| 1825 | RemovePalette(); |
| 1826 | m_pFilter->NotifyEvent(EC_PALETTE_CHANGED, 0, 0); |
| 1827 | |
| 1828 | // Do we need a palette for the new format |
| 1829 | |
| 1830 | if (ContainsPalette(pNewInfo) == FALSE) |
| 1831 | { |
| 1832 | NOTE("New has no palette"); |
| 1833 | return S_FALSE; |
| 1834 | } |
| 1835 | |
| 1836 | if (m_pBaseWindow) |
| 1837 | { |
| 1838 | m_pBaseWindow->LockPaletteLock(); |
| 1839 | } |
| 1840 | |
| 1841 | // If we're changing the palette on the fly then we increment our palette |
| 1842 | // cookie which is compared against the cookie also stored in all of our |
| 1843 | // DIBSECTION media samples. If they don't match when we come to draw it |
| 1844 | // then we know the sample is out of date and we'll update it's palette |
| 1845 | |
| 1846 | NOTE("Making new colour palette"); |
| 1847 | m_hPalette = MakePalette(pNewInfo, szDevice); |
| 1848 | ASSERT(m_hPalette != NULL); |
| 1849 | |
| 1850 | if (m_pBaseWindow) |
| 1851 | { |
| 1852 | m_pBaseWindow->UnlockPaletteLock(); |
| 1853 | } |
| 1854 | |
| 1855 | // The window in which the new palette is to be realised may be a NULL |
| 1856 | // pointer to signal that no window is in use, if so we don't call it |
| 1857 | // Some filters just want to use this object to create/manage palettes |
| 1858 | |
| 1859 | if (m_pBaseWindow) |
| 1860 | m_pBaseWindow->SetPalette(m_hPalette); |
nothing calls this directly
no test coverage detected