office-gobmx/canvas/source/vcl/canvasbitmaphelper.cxx
Noel Grandin 81994cb2b8 Convert internal vcl bitmap formats transparency->alpha (II)
(Second attempt at landing this)

Image formats and graphics APIs use alpha, not transparency,
so change our internal formats and data structures to work directly
with alpha, so we don't need to modify data before we push it to
graphics APIs.

Add a couple of new Color constants to make the intention
of the vcl code clearer.

Notes
(*) On macOS, tweaking the logic in CreateWithSalBitmapAndMask
to more accurately reflect the requirements of the
CGImageCreateWithMask function seems to fix some
tests.

(*) The vcl code does not properly support gradients
with transparency. So the previous code was wrong, and this
change is going to result in slightly different wrongness.

Change-Id: I9e21c2e98d88ecfdc5f75db13bd1ffff7c38db98
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/114168
Tested-by: Jenkins
Reviewed-by: Patrick Luby <plubius@neooffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
2023-07-25 08:38:12 +02:00

176 lines
6.2 KiB
C++

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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* This file incorporates work covered by the following license notice:
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#include <sal/config.h>
#include <sal/log.hxx>
#include <canvas/canvastools.hxx>
#include <comphelper/diagnose_ex.hxx>
#include <vcl/bitmapex.hxx>
#include <vcl/BitmapTools.hxx>
#include <vcl/canvastools.hxx>
#include "canvasbitmap.hxx"
#include "canvasbitmaphelper.hxx"
using namespace ::com::sun::star;
namespace vclcanvas
{
CanvasBitmapHelper::CanvasBitmapHelper()
{
}
void CanvasBitmapHelper::init( const BitmapEx& rBitmap,
rendering::XGraphicDevice& rDevice,
const OutDevProviderSharedPtr& rOutDevReference )
{
mpOutDevReference = rOutDevReference;
mpBackBuffer = std::make_shared<BitmapBackBuffer>( rBitmap, rOutDevReference->getOutDev() );
// forward new settings to base class (ref device, output
// surface, no protection (own backbuffer), alpha depends on
// whether BmpEx is transparent or not)
CanvasHelper::init( rDevice,
mpBackBuffer,
false,
rBitmap.IsAlpha() );
}
void CanvasBitmapHelper::disposing()
{
mpBackBuffer.reset();
mpOutDevReference.reset();
// forward to base class
CanvasHelper::disposing();
}
geometry::IntegerSize2D CanvasBitmapHelper::getSize() const
{
if( !mpBackBuffer )
return geometry::IntegerSize2D();
return vcl::unotools::integerSize2DFromSize( mpBackBuffer->getBitmapSizePixel() );
}
void CanvasBitmapHelper::clear()
{
// are we disposed?
if( mpBackBuffer )
mpBackBuffer->clear(); // alpha vdev needs special treatment
}
uno::Reference< rendering::XBitmap > CanvasBitmapHelper::getScaledBitmap( const geometry::RealSize2D& newSize,
bool beFast )
{
ENSURE_OR_THROW( mpDevice,
"disposed CanvasHelper" );
SAL_INFO( "canvas.vcl", "::vclcanvas::CanvasBitmapHelper::getScaledBitmap()" );
if( !mpBackBuffer || mpDevice )
return uno::Reference< rendering::XBitmap >(); // we're disposed
BitmapEx aRes( mpBackBuffer->getBitmapReference() );
aRes.Scale( vcl::unotools::sizeFromRealSize2D(newSize),
beFast ? BmpScaleFlag::Default : BmpScaleFlag::BestQuality );
return uno::Reference< rendering::XBitmap >(
new CanvasBitmap( aRes, *mpDevice, mpOutDevReference ) );
}
uno::Sequence< sal_Int8 > CanvasBitmapHelper::getData( rendering::IntegerBitmapLayout& rLayout,
const geometry::IntegerRectangle2D& rect )
{
SAL_INFO( "canvas.vcl", "::vclcanvas::CanvasBitmapHelper::getData()" );
if( !mpBackBuffer )
return uno::Sequence< sal_Int8 >(); // we're disposed
rLayout = getMemoryLayout();
// TODO(F1): Support more formats.
const Size aBmpSize( mpBackBuffer->getBitmapReference().GetSizePixel() );
rLayout.ScanLines = aBmpSize.Height();
rLayout.ScanLineBytes = aBmpSize.Width()*4;
rLayout.ScanLineStride = rLayout.ScanLineBytes;
uno::Sequence< sal_Int8 > aRes = vcl::bitmap::CanvasExtractBitmapData(mpBackBuffer->getBitmapReference(), rect);
return aRes;
}
uno::Sequence< sal_Int8 > CanvasBitmapHelper::getPixel( rendering::IntegerBitmapLayout& rLayout,
const geometry::IntegerPoint2D& pos )
{
SAL_INFO( "canvas.vcl", "::vclcanvas::CanvasBitmapHelper::getPixel()" );
if( !mpBackBuffer )
return uno::Sequence< sal_Int8 >(); // we're disposed
rLayout = getMemoryLayout();
rLayout.ScanLines = 1;
rLayout.ScanLineBytes = 4;
rLayout.ScanLineStride = rLayout.ScanLineBytes;
const Size aBmpSize( mpBackBuffer->getBitmapReference().GetSizePixel() );
ENSURE_ARG_OR_THROW( pos.X >= 0 && pos.X < aBmpSize.Width(),
"X coordinate out of bounds" );
ENSURE_ARG_OR_THROW( pos.Y >= 0 && pos.Y < aBmpSize.Height(),
"Y coordinate out of bounds" );
::Color aColor = mpBackBuffer->getBitmapReference().GetPixelColor(pos.X, pos.Y);
uno::Sequence< sal_Int8 > aRes( 4 );
sal_Int8* pRes = aRes.getArray();
pRes[ 0 ] = aColor.GetRed();
pRes[ 1 ] = aColor.GetGreen();
pRes[ 2 ] = aColor.GetBlue();
pRes[ 3 ] = aColor.GetAlpha();
return aRes;
}
rendering::IntegerBitmapLayout CanvasBitmapHelper::getMemoryLayout() const
{
if( !mpOutDevProvider )
return rendering::IntegerBitmapLayout(); // we're disposed
rendering::IntegerBitmapLayout aBitmapLayout( ::canvas::tools::getStdMemoryLayout(getSize()) );
if ( !hasAlpha() )
aBitmapLayout.ColorSpace = canvas::tools::getStdColorSpaceWithoutAlpha();
return aBitmapLayout;
}
BitmapEx CanvasBitmapHelper::getBitmap() const
{
if( !mpBackBuffer )
return BitmapEx(); // we're disposed
else
return mpBackBuffer->getBitmapReference();
}
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */