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| author | Miklos Vajna <vmiklos@collabora.co.uk> | 2015-10-01 14:17:21 +0200 |
|---|---|---|
| committer | Miklos Vajna <vmiklos@collabora.co.uk> | 2015-10-01 16:45:23 +0200 |
| commit | 1d3b613318654ceb2d34996ef8ca653cfe32a8ea (patch) | |
| tree | a996b2c83a430af3a88a5af91daed6f7c1817e52 /desktop/source/lib/init.cxx | |
| parent | ded566addabf4e6813d22b14de4fb8ce8405d491 (diff) | |
desktop, vcl: support transparency in VirtualDevices with user-provided memory
Change-Id: I65c31995c02a644aa436aecd065255fab38045e4
Diffstat (limited to 'desktop/source/lib/init.cxx')
| -rw-r--r-- | desktop/source/lib/init.cxx | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/desktop/source/lib/init.cxx b/desktop/source/lib/init.cxx index 509983c1c8ac..e902df0c71ba 100644 --- a/desktop/source/lib/init.cxx +++ b/desktop/source/lib/init.cxx @@ -755,10 +755,21 @@ void doc_paintTile (LibreOfficeKitDocument* pThis, InitSvpForLibreOfficeKit(); ScopedVclPtrInstance< VirtualDevice > pDevice(nullptr, Size(1, 1), (sal_uInt16)32) ; + + // Set background to transparent by default. + memset(pBuffer, 0, nCanvasWidth * nCanvasHeight * 4); + pDevice->SetBackground(Wallpaper(Color(COL_TRANSPARENT))); + boost::shared_array< sal_uInt8 > aBuffer( pBuffer, NoDelete< sal_uInt8 >() ); + + // Allocate a separate buffer for the alpha device. + std::vector<sal_uInt8> aAlpha(nCanvasWidth * nCanvasHeight); + memset(aAlpha.data(), 0, nCanvasWidth * nCanvasHeight); + boost::shared_array<sal_uInt8> aAlphaBuffer(aAlpha.data(), NoDelete<sal_uInt8>()); + pDevice->SetOutputSizePixelScaleOffsetAndBuffer( Size(nCanvasWidth, nCanvasHeight), Fraction(1.0), Point(), - aBuffer, true ); + aBuffer, aAlphaBuffer, true ); pDoc->paintTile(*pDevice.get(), nCanvasWidth, nCanvasHeight, nTilePosX, nTilePosY, nTileWidth, nTileHeight); @@ -772,6 +783,17 @@ void doc_paintTile (LibreOfficeKitDocument* pThis, nTilePosX, nTilePosY, nTileWidth, nTileHeight); #endif + // Overwrite pBuffer's alpha channel with the separate alpha buffer. + for (int nRow = 0; nRow < nCanvasHeight; ++nRow) + { + for (int nCol = 0; nCol < nCanvasWidth; ++nCol) + { + const int nOffset = (nCanvasHeight * nRow) + nCol; + // VCL's transparent is 0, RGBA's transparent is 0xff. + pBuffer[nOffset * 4 +3] = 0xff - aAlpha[nOffset]; + } + } + static bool bDebug = getenv("LOK_DEBUG") != 0; if (bDebug) { |