9a0dad2a64
Before commit 81994cb2b8,
RemoveBlendedStartColor(COL_BLACK, aAlpha) would darken
the bitmap when running a slideshow, printing, or exporting
to PDF. To get the same effect, the alpha mask must be
inverted, RemoveBlendedStartColor(COL_WHITE, aAlpha)
called, and the alpha mask uninverted.
Change-Id: I8e81b11aab05954c821f833f4a2fc77eec7b7701
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/159742
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>
382 lines
15 KiB
C++
382 lines
15 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#include <drawinglayer/geometry/viewinformation2d.hxx>
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#include <drawinglayer/primitive2d/modifiedcolorprimitive2d.hxx>
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#include <basegfx/matrix/b2dhommatrixtools.hxx>
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#include <drawinglayer/primitive2d/transformprimitive2d.hxx>
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#include <drawinglayer/processor2d/baseprocessor2d.hxx>
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#include <drawinglayer/processor2d/processor2dtools.hxx>
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#include <vcl/svapp.hxx>
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#include <vcl/virdev.hxx>
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#include <com/sun/star/geometry/RealRectangle2D.hpp>
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#include <comphelper/diagnose_ex.hxx>
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#include <drawinglayer/converters.hxx>
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#ifdef DBG_UTIL
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#include <tools/stream.hxx>
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// #include <vcl/filter/PngImageWriter.hxx>
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#include <vcl/dibtools.hxx>
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#endif
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// #include <vcl/BitmapReadAccess.hxx>
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namespace
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{
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bool implPrepareConversion(drawinglayer::primitive2d::Primitive2DContainer& rSequence,
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sal_uInt32& rnDiscreteWidth, sal_uInt32& rnDiscreteHeight,
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const sal_uInt32 nMaxSquarePixels)
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{
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if (rSequence.empty())
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return false;
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if (rnDiscreteWidth <= 0 || rnDiscreteHeight <= 0)
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return false;
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const sal_uInt32 nViewVisibleArea(rnDiscreteWidth * rnDiscreteHeight);
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if (nViewVisibleArea > nMaxSquarePixels)
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{
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// reduce render size
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double fReduceFactor
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= sqrt(static_cast<double>(nMaxSquarePixels) / static_cast<double>(nViewVisibleArea));
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rnDiscreteWidth = basegfx::fround(static_cast<double>(rnDiscreteWidth) * fReduceFactor);
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rnDiscreteHeight = basegfx::fround(static_cast<double>(rnDiscreteHeight) * fReduceFactor);
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const drawinglayer::primitive2d::Primitive2DReference aEmbed(
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new drawinglayer::primitive2d::TransformPrimitive2D(
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basegfx::utils::createScaleB2DHomMatrix(fReduceFactor, fReduceFactor),
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std::move(rSequence)));
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rSequence = drawinglayer::primitive2d::Primitive2DContainer{ aEmbed };
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}
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return true;
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}
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AlphaMask implcreateAlphaMask(drawinglayer::primitive2d::Primitive2DContainer& rSequence,
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const drawinglayer::geometry::ViewInformation2D& rViewInformation2D,
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const Size& rSizePixel, bool bUseLuminance)
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{
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ScopedVclPtrInstance<VirtualDevice> pContent;
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// prepare vdev
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if (!pContent->SetOutputSizePixel(rSizePixel, false))
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{
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SAL_WARN("vcl", "Cannot set VirtualDevice to size : " << rSizePixel.Width() << "x"
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<< rSizePixel.Height());
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return AlphaMask();
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}
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// create pixel processor, also already takes care of AAing and
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// checking the getOptionsDrawinglayer().IsAntiAliasing() switch. If
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// not wanted, change after this call as needed
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std::unique_ptr<drawinglayer::processor2d::BaseProcessor2D> pContentProcessor
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= drawinglayer::processor2d::createPixelProcessor2DFromOutputDevice(*pContent,
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rViewInformation2D);
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// prepare for mask creation
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pContent->SetMapMode(MapMode(MapUnit::MapPixel));
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// set transparency to all white (fully transparent)
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pContent->Erase();
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basegfx::BColorModifierSharedPtr aBColorModifier;
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if (bUseLuminance)
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{
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// new mode: bUseLuminance allows simple creation of alpha channels
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// for any content (e.g. gradients)
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aBColorModifier = std::make_shared<basegfx::BColorModifier_luminance_to_alpha>();
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}
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else
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{
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// Embed primitives to paint them black (fully opaque)
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aBColorModifier
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= std::make_shared<basegfx::BColorModifier_replace>(basegfx::BColor(0.0, 0.0, 0.0));
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}
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const drawinglayer::primitive2d::Primitive2DReference xRef(
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new drawinglayer::primitive2d::ModifiedColorPrimitive2D(std::move(rSequence),
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aBColorModifier));
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const drawinglayer::primitive2d::Primitive2DContainer xSeq{ xRef };
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// render
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pContentProcessor->process(xSeq);
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pContentProcessor.reset();
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// get alpha channel from vdev
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pContent->EnableMapMode(false);
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const Point aEmptyPoint;
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// Convert from transparency->alpha.
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// FIXME in theory I should be able to directly construct alpha by using black as background
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// and white as foreground, but that doesn't work for some reason.
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Bitmap aContentBitmap = pContent->GetBitmap(aEmptyPoint, rSizePixel);
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aContentBitmap.Invert();
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return AlphaMask(aContentBitmap);
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}
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}
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namespace drawinglayer
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{
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AlphaMask createAlphaMask(drawinglayer::primitive2d::Primitive2DContainer&& rSeq,
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const geometry::ViewInformation2D& rViewInformation2D,
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sal_uInt32 nDiscreteWidth, sal_uInt32 nDiscreteHeight,
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sal_uInt32 nMaxSquarePixels, bool bUseLuminance)
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{
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drawinglayer::primitive2d::Primitive2DContainer aSequence(std::move(rSeq));
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if (!implPrepareConversion(aSequence, nDiscreteWidth, nDiscreteHeight, nMaxSquarePixels))
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{
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return AlphaMask();
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}
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const Size aSizePixel(nDiscreteWidth, nDiscreteHeight);
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return implcreateAlphaMask(aSequence, rViewInformation2D, aSizePixel, bUseLuminance);
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}
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BitmapEx convertToBitmapEx(drawinglayer::primitive2d::Primitive2DContainer&& rSeq,
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const geometry::ViewInformation2D& rViewInformation2D,
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sal_uInt32 nDiscreteWidth, sal_uInt32 nDiscreteHeight,
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sal_uInt32 nMaxSquarePixels, bool bForceAlphaMaskCreation)
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{
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drawinglayer::primitive2d::Primitive2DContainer aSequence(std::move(rSeq));
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if (!implPrepareConversion(aSequence, nDiscreteWidth, nDiscreteHeight, nMaxSquarePixels))
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{
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return BitmapEx();
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}
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const Point aEmptyPoint;
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const Size aSizePixel(nDiscreteWidth, nDiscreteHeight);
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// Create target VirtualDevice. Go back to using a simple RGB
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// target version (compared with former version, see history).
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// Reasons are manyfold:
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// - Avoid the RGBA mode for VirtualDevice (two VDevs)
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// - It's not suggested to be used outside presentation engine
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// - It only works *by chance* with VCLPrimitiveRenderer
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// - Usage of two-VDev alpha-VDev avoided alpha blending against
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// COL_WHITE in the 1st layer of targets (not in buffers below)
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// but is kind of a 'hack' doing so
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// - Other renderers (system-dependent PrimitiveRenderers, other
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// than the VCL-based ones) will probably not support splitted
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// VDevs for content/alpha, so require a method that works with
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// RGB targeting (for now)
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// - Less resource usage, better speed (no 2 VDevs, no merge of
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// AlphaChannels)
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// As long as not all our mechanisms are changed to RGBA completely,
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// mixing these is just too dangerous and expensive and may to wrong
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// or deliver bad quality results.
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// Nonetheless we need a RGBA result here. Luckily we are able to
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// create a complete and valid AlphaChannel using 'createAlphaMask'
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// above.
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// When we know the content (RGB result from renderer), alpha
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// (result from createAlphaMask) and the start condition (content
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// rendered against COL_WHITE), it is possible to calculate back
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// the content, quasi 'remove' that initial blending against
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// COL_WHITE.
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// That is what the helper Bitmap::RemoveBlendedStartColor does.
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// Luckily we only need it for this 'convertToBitmapEx', not in
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// any other rendering. It could be further optimized, too.
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// This gives good results, it is in principle comparable with
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// the results using pre-multiplied alpha tooling, also reducing
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// the range of values where high alpha values are used.
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ScopedVclPtrInstance<VirtualDevice> pContent(*Application::GetDefaultDevice());
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// prepare vdev
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if (!pContent->SetOutputSizePixel(aSizePixel, false))
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{
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SAL_WARN("vcl", "Cannot set VirtualDevice to size : " << aSizePixel.Width() << "x"
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<< aSizePixel.Height());
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return BitmapEx();
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}
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// We map to pixel, use that MapMode. Init by erasing.
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pContent->SetMapMode(MapMode(MapUnit::MapPixel));
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pContent->Erase();
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// create pixel processor, also already takes care of AAing and
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// checking the getOptionsDrawinglayer().IsAntiAliasing() switch. If
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// not wanted, change after this call as needed
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std::unique_ptr<processor2d::BaseProcessor2D> pContentProcessor
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= processor2d::createPixelProcessor2DFromOutputDevice(*pContent, rViewInformation2D);
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// render content
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pContentProcessor->process(aSequence);
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// create final BitmapEx result (content)
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Bitmap aRetval(pContent->GetBitmap(aEmptyPoint, aSizePixel));
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#ifdef DBG_UTIL
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static bool bDoSaveForVisualControl(false); // loplugin:constvars:ignore
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if (bDoSaveForVisualControl)
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{
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// VCL_DUMP_BMP_PATH should be like C:/path/ or ~/path/
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static const OUString sDumpPath(
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OUString::createFromAscii(std::getenv("VCL_DUMP_BMP_PATH")));
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if (!sDumpPath.isEmpty())
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{
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SvFileStream aNew(sDumpPath + "test_content.bmp",
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StreamMode::WRITE | StreamMode::TRUNC);
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WriteDIB(aRetval, aNew, false, true);
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}
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}
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#endif
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// Create the AlphaMask using a method that does this always correct (also used
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// now in GlowPrimitive2D and ShadowPrimitive2D which both only need the
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// AlphaMask to do their job, so speeding that up, too).
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AlphaMask aAlpha(implcreateAlphaMask(aSequence, rViewInformation2D, aSizePixel, false));
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#ifdef DBG_UTIL
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if (bDoSaveForVisualControl)
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{
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// VCL_DUMP_BMP_PATH should be like C:/path/ or ~/path/
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static const OUString sDumpPath(
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OUString::createFromAscii(std::getenv("VCL_DUMP_BMP_PATH")));
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if (!sDumpPath.isEmpty())
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{
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SvFileStream aNew(sDumpPath + "test_alpha.bmp", StreamMode::WRITE | StreamMode::TRUNC);
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WriteDIB(aAlpha.GetBitmap(), aNew, false, true);
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}
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}
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#endif
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if (bForceAlphaMaskCreation || aAlpha.hasAlpha())
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{
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// Need to correct content using known alpha to get to background-free
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// RGBA result, usable e.g. in PNG export(s) or convert-to-bitmap.
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// Now that vcl supports bitmaps with an alpha channel, only apply
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// this correction to bitmaps without an alpha channel.
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if (pContent->GetBitCount() < 32)
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{
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aRetval.RemoveBlendedStartColor(COL_BLACK, aAlpha);
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}
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else
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{
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// tdf#157558 invert and remove blended white color
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// Before commit 81994cb2b8b32453a92bcb011830fcb884f22ff3,
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// RemoveBlendedStartColor(COL_BLACK, aAlpha) would darken
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// the bitmap when running a slideshow, printing, or exporting
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// to PDF. To get the same effect, the alpha mask must be
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// inverted, RemoveBlendedStartColor(COL_WHITE, aAlpha)
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// called, and the alpha mask uninverted.
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aAlpha.Invert();
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aRetval.RemoveBlendedStartColor(COL_WHITE, aAlpha);
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aAlpha.Invert();
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}
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// return combined result
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return BitmapEx(aRetval, aAlpha);
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}
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else
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return BitmapEx(aRetval);
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}
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BitmapEx convertPrimitive2DContainerToBitmapEx(primitive2d::Primitive2DContainer&& rSequence,
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const basegfx::B2DRange& rTargetRange,
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sal_uInt32 nMaximumQuadraticPixels,
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const o3tl::Length eTargetUnit,
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const std::optional<Size>& rTargetDPI)
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{
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if (rSequence.empty())
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return BitmapEx();
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try
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{
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css::geometry::RealRectangle2D aRealRect;
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aRealRect.X1 = rTargetRange.getMinX();
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aRealRect.Y1 = rTargetRange.getMinY();
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aRealRect.X2 = rTargetRange.getMaxX();
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aRealRect.Y2 = rTargetRange.getMaxY();
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// get system DPI
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Size aDPI(
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Application::GetDefaultDevice()->LogicToPixel(Size(1, 1), MapMode(MapUnit::MapInch)));
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if (rTargetDPI.has_value())
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{
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aDPI = *rTargetDPI;
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}
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::sal_uInt32 DPI_X = aDPI.getWidth();
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::sal_uInt32 DPI_Y = aDPI.getHeight();
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const basegfx::B2DRange aRange(aRealRect.X1, aRealRect.Y1, aRealRect.X2, aRealRect.Y2);
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const double fWidth(aRange.getWidth());
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const double fHeight(aRange.getHeight());
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if (!(basegfx::fTools::more(fWidth, 0.0) && basegfx::fTools::more(fHeight, 0.0)))
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return BitmapEx();
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if (0 == DPI_X)
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{
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DPI_X = 75;
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}
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if (0 == DPI_Y)
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{
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DPI_Y = 75;
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}
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if (0 == nMaximumQuadraticPixels)
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{
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nMaximumQuadraticPixels = 500000;
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}
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const auto aViewInformation2D = geometry::createViewInformation2D({});
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const sal_uInt32 nDiscreteWidth(
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basegfx::fround(o3tl::convert(fWidth, eTargetUnit, o3tl::Length::in) * DPI_X));
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const sal_uInt32 nDiscreteHeight(
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basegfx::fround(o3tl::convert(fHeight, eTargetUnit, o3tl::Length::in) * DPI_Y));
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basegfx::B2DHomMatrix aEmbedding(
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basegfx::utils::createTranslateB2DHomMatrix(-aRange.getMinX(), -aRange.getMinY()));
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aEmbedding.scale(nDiscreteWidth / fWidth, nDiscreteHeight / fHeight);
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const primitive2d::Primitive2DReference xEmbedRef(
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new primitive2d::TransformPrimitive2D(aEmbedding, std::move(rSequence)));
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primitive2d::Primitive2DContainer xEmbedSeq{ xEmbedRef };
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BitmapEx aBitmapEx(convertToBitmapEx(std::move(xEmbedSeq), aViewInformation2D,
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nDiscreteWidth, nDiscreteHeight,
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nMaximumQuadraticPixels));
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if (aBitmapEx.IsEmpty())
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return BitmapEx();
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aBitmapEx.SetPrefMapMode(MapMode(MapUnit::Map100thMM));
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aBitmapEx.SetPrefSize(Size(basegfx::fround(fWidth), basegfx::fround(fHeight)));
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return aBitmapEx;
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}
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catch (const css::uno::Exception&)
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{
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TOOLS_WARN_EXCEPTION("vcl", "Got no graphic::XPrimitive2DRenderer!");
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}
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catch (const std::exception& e)
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{
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SAL_WARN("vcl", "Got no graphic::XPrimitive2DRenderer! : " << e.what());
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}
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return BitmapEx();
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}
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} // end of namespace drawinglayer
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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