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move cairo surface code from canvas to BitmapTools

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part of making Bitmap an implementation detail of vcl/

Change-Id: Ic4b8d114a8091041374a083b3b7ca2fa68757ab1
Reviewed-on: https://gerrit.libreoffice.org/49719
Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
This commit is contained in:
Noel Grandin
2018-02-14 14:27:12 +02:00
parent abcd782510
commit 32d8a32dcf
3 changed files with 91 additions and 71 deletions
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77
canvas/source/cairo/cairo_canvasbitmap.cxx
View File

@@ -22,7 +22,7 @@
#include <cppuhelper/supportsservice.hxx>
#include <tools/diagnose_ex.h>
#include <vcl/bitmapex.hxx>
#include <vcl/bitmapaccess.hxx>
#include <vcl/BitmapTools.hxx>
#include <canvas/canvastools.hxx>
@@ -118,77 +118,12 @@ namespace cairocanvas
if ( !mbHasAlpha )
break;
::Size aSize( maSize.getX(), maSize.getY() );
// FIXME: if we could teach VCL/ about cairo handles, life could
// be significantly better here perhaps.
cairo_surface_t *pPixels;
pPixels = cairo_image_surface_create( CAIRO_FORMAT_ARGB32,
aSize.Width(), aSize.Height() );
cairo_t *pCairo = cairo_create( pPixels );
if( !pPixels || !pCairo || cairo_status(pCairo) != CAIRO_STATUS_SUCCESS )
break;
BitmapEx* pBitmapEx = vcl::bitmap::CreateFromCairoSurface(
::Size( maSize.getX(), maSize.getY() ),
getSurface()->getCairoSurface().get());
if (pBitmapEx)
aRV <<= reinterpret_cast<sal_Int64>( pBitmapEx );
// suck ourselves from the X server to this buffer so then we can fiddle with
// Alpha to turn it into the ultra-lame vcl required format and then push it
// all back again later at vast expense [ urgh ]
cairo_set_source_surface( pCairo, getSurface()->getCairoSurface().get(), 0, 0 );
cairo_set_operator( pCairo, CAIRO_OPERATOR_SOURCE );
cairo_paint( pCairo );
::Bitmap aRGB( aSize, 24 );
::AlphaMask aMask( aSize );
BitmapWriteAccess *pRGBWrite( aRGB.AcquireWriteAccess() );
if( pRGBWrite )
{
BitmapWriteAccess *pMaskWrite( aMask.AcquireWriteAccess() );
if( pMaskWrite )
{
cairo_surface_flush(pPixels);
unsigned char *pSrc = cairo_image_surface_get_data( pPixels );
unsigned int nStride = cairo_image_surface_get_stride( pPixels );
for( unsigned long y = 0; y < static_cast<unsigned long>(aSize.Height()); y++ )
{
sal_uInt32 *pPix = reinterpret_cast<sal_uInt32 *>(pSrc + nStride * y);
for( unsigned long x = 0; x < static_cast<unsigned long>(aSize.Width()); x++ )
{
#if defined OSL_BIGENDIAN
sal_uInt8 nB = (*pPix >> 24);
sal_uInt8 nG = (*pPix >> 16) & 0xff;
sal_uInt8 nR = (*pPix >> 8) & 0xff;
sal_uInt8 nAlpha = *pPix & 0xff;
#else
sal_uInt8 nAlpha = (*pPix >> 24);
sal_uInt8 nR = (*pPix >> 16) & 0xff;
sal_uInt8 nG = (*pPix >> 8) & 0xff;
sal_uInt8 nB = *pPix & 0xff;
#endif
if( nAlpha != 0 && nAlpha != 255 )
{
// Cairo uses pre-multiplied alpha - we do not => re-multiply
nR = static_cast<sal_uInt8>(MinMax( (static_cast<sal_uInt32>(nR) * 255) / nAlpha, 0, 255 ));
nG = static_cast<sal_uInt8>(MinMax( (static_cast<sal_uInt32>(nG) * 255) / nAlpha, 0, 255 ));
nB = static_cast<sal_uInt8>(MinMax( (static_cast<sal_uInt32>(nB) * 255) / nAlpha, 0, 255 ));
}
pRGBWrite->SetPixel( y, x, BitmapColor( nR, nG, nB ) );
pMaskWrite->SetPixelIndex( y, x, 255 - nAlpha );
pPix++;
}
}
aMask.ReleaseAccess( pMaskWrite );
}
::Bitmap::ReleaseAccess( pRGBWrite );
}
// ignore potential errors above. will get caller a
// uniformely white bitmap, but not that there would
// be error handling in calling code ...
::BitmapEx *pBitmapEx = new ::BitmapEx( aRGB, aMask );
cairo_destroy( pCairo );
cairo_surface_destroy( pPixels );
aRV <<= reinterpret_cast<sal_Int64>( pBitmapEx );
break;
}
case 1:

8
include/vcl/BitmapTools.hxx
View File

@@ -10,10 +10,14 @@
#ifndef INCLUDED_VCL_BITMAP_TOOLS_HXX
#define INCLUDED_VCL_BITMAP_TOOLS_HXX
#include <config_cairo_canvas.h>
#include <vcl/bitmapex.hxx>
#include <vcl/ImageTree.hxx>
#include <vcl/salbtype.hxx>
#include <tools/stream.hxx>
#if ENABLE_CAIRO_CANVAS
#include <vcl/cairo.hxx>
#endif
namespace vcl {
namespace bitmap {
@@ -66,6 +70,10 @@ BitmapEx VCL_DLLPUBLIC CreateFromData( sal_uInt8 const *pData, sal_Int32 nWidth,
BitmapEx VCL_DLLPUBLIC CreateFromData( RawBitmap && data );
#if ENABLE_CAIRO_CANVAS
VCL_DLLPUBLIC BitmapEx* CreateFromCairoSurface(Size size, cairo_surface_t* pSurface);
#endif
}} // end vcl::bitmap
#endif // INCLUDED_VCL_BITMAP_TOOLS_HXX

77
vcl/source/bitmap/BitmapTools.cxx
View File

@@ -26,6 +26,9 @@
#include <vcl/svapp.hxx>
#include <vcl/salbtype.hxx>
#include <vcl/bitmapaccess.hxx>
#if ENABLE_CAIRO_CANVAS
#include <cairo.h>
#endif
using namespace css;
@@ -199,6 +202,80 @@ BitmapEx CreateFromData( RawBitmap&& rawBitmap )
return aBmp;
}
#if ENABLE_CAIRO_CANVAS
BitmapEx* CreateFromCairoSurface(Size aSize, cairo_surface_t * pSurface)
{
// FIXME: if we could teach VCL/ about cairo handles, life could
// be significantly better here perhaps.
cairo_surface_t *pPixels = cairo_image_surface_create( CAIRO_FORMAT_ARGB32,
aSize.Width(), aSize.Height() );
cairo_t *pCairo = cairo_create( pPixels );
if( !pPixels || !pCairo || cairo_status(pCairo) != CAIRO_STATUS_SUCCESS )
return nullptr;
// suck ourselves from the X server to this buffer so then we can fiddle with
// Alpha to turn it into the ultra-lame vcl required format and then push it
// all back again later at vast expense [ urgh ]
cairo_set_source_surface( pCairo, pSurface, 0, 0 );
cairo_set_operator( pCairo, CAIRO_OPERATOR_SOURCE );
cairo_paint( pCairo );
::Bitmap aRGB( aSize, 24 );
::AlphaMask aMask( aSize );
Bitmap::ScopedWriteAccess pRGBWrite(aRGB);
assert(pRGBWrite);
if (!pRGBWrite)
return nullptr;
AlphaMask::ScopedWriteAccess pMaskWrite(aMask);
assert(pMaskWrite);
if (!pMaskWrite)
return nullptr;
cairo_surface_flush(pPixels);
unsigned char *pSrc = cairo_image_surface_get_data( pPixels );
unsigned int nStride = cairo_image_surface_get_stride( pPixels );
for( unsigned long y = 0; y < static_cast<unsigned long>(aSize.Height()); y++ )
{
sal_uInt32 *pPix = reinterpret_cast<sal_uInt32 *>(pSrc + nStride * y);
for( unsigned long x = 0; x < static_cast<unsigned long>(aSize.Width()); x++ )
{
#if defined OSL_BIGENDIAN
sal_uInt8 nB = (*pPix >> 24);
sal_uInt8 nG = (*pPix >> 16) & 0xff;
sal_uInt8 nR = (*pPix >> 8) & 0xff;
sal_uInt8 nAlpha = *pPix & 0xff;
#else
sal_uInt8 nAlpha = (*pPix >> 24);
sal_uInt8 nR = (*pPix >> 16) & 0xff;
sal_uInt8 nG = (*pPix >> 8) & 0xff;
sal_uInt8 nB = *pPix & 0xff;
#endif
if( nAlpha != 0 && nAlpha != 255 )
{
// Cairo uses pre-multiplied alpha - we do not => re-multiply
nR = static_cast<sal_uInt8>(MinMax( (static_cast<sal_uInt32>(nR) * 255) / nAlpha, 0, 255 ));
nG = static_cast<sal_uInt8>(MinMax( (static_cast<sal_uInt32>(nG) * 255) / nAlpha, 0, 255 ));
nB = static_cast<sal_uInt8>(MinMax( (static_cast<sal_uInt32>(nB) * 255) / nAlpha, 0, 255 ));
}
pRGBWrite->SetPixel( y, x, BitmapColor( nR, nG, nB ) );
pMaskWrite->SetPixelIndex( y, x, 255 - nAlpha );
pPix++;
}
}
// ignore potential errors above. will get caller a
// uniformly white bitmap, but not that there would
// be error handling in calling code ...
::BitmapEx *pBitmapEx = new ::BitmapEx( aRGB, aMask );
cairo_destroy( pCairo );
cairo_surface_destroy( pPixels );
return pBitmapEx;
}
#endif
}} // end vcl::bitmap
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