1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <sal/config.h>

#include <com/sun/star/rendering/TextDirection.hpp>

#include <rtl/math.hxx>
#include <basegfx/matrix/b2dhommatrix.hxx>
#include <tools/diagnose_ex.h>
#include <vcl/canvastools.hxx>
#include <vcl/metric.hxx>
#include <vcl/virdev.hxx>

#include <canvas/canvastools.hxx>
#include <verifyinput.hxx>
#include <cairo.h>

#include "cairo_canvasfont.hxx"
#include "cairo_canvashelper.hxx"
#include "cairo_textlayout.hxx"

using namespace ::cairo;
using namespace ::com::sun::star;

namespace cairocanvas
{
    uno::Reference< rendering::XCanvasFont > CanvasHelper::createFont( const rendering::XCanvas*                    ,
                                                                       const rendering::FontRequest&                fontRequest,
                                                                       const uno::Sequence< beans::PropertyValue >& extraFontProperties,
                                                                       const geometry::Matrix2D&                    fontMatrix )
    {
        return uno::Reference< rendering::XCanvasFont >( new CanvasFont( fontRequest, extraFontProperties, fontMatrix, mpSurfaceProvider ));
    }

    uno::Sequence< rendering::FontInfo > CanvasHelper::queryAvailableFonts( const rendering::XCanvas*                       ,
                                                                            const rendering::FontInfo&                      /*aFilter*/,
                                                                            const uno::Sequence< beans::PropertyValue >&    /*aFontProperties*/ )
    {
        // TODO
        return uno::Sequence< rendering::FontInfo >();
    }

    static bool
    setupFontTransform( ::OutputDevice const &          rOutDev,
                        ::Point&                        o_rPoint,
                        vcl::Font&                      io_rVCLFont,
                        const rendering::ViewState&     rViewState,
                        const rendering::RenderState&   rRenderState )
    {
        ::basegfx::B2DHomMatrix aMatrix;

        ::canvas::tools::mergeViewAndRenderTransform(aMatrix,
                                                     rViewState,
                                                     rRenderState);

        ::basegfx::B2DTuple aScale;
        ::basegfx::B2DTuple aTranslate;
        double nRotate, nShearX;

        aMatrix.decompose( aScale, aTranslate, nRotate, nShearX );

        // query font metric _before_ tampering with width and height
        if( !::rtl::math::approxEqual(aScale.getX(), aScale.getY()) )
        {
            // retrieve true font width
            const sal_Int32 nFontWidth( rOutDev.GetFontMetric( io_rVCLFont ).GetAverageFontWidth() );

            const sal_Int32 nScaledFontWidth( ::basegfx::fround(nFontWidth * aScale.getX()) );

            if( !nScaledFontWidth )
            {
                // scale is smaller than one pixel - disable text
                // output altogether
                return false;
            }

            io_rVCLFont.SetAverageFontWidth( nScaledFontWidth );
        }

        if( !::rtl::math::approxEqual(aScale.getY(), 1.0) )
        {
            const sal_Int32 nFontHeight( io_rVCLFont.GetFontHeight() );
            io_rVCLFont.SetFontHeight( ::basegfx::fround(nFontHeight * aScale.getY()) );
        }

        io_rVCLFont.SetOrientation( static_cast< short >( ::basegfx::fround(-fmod(nRotate, 2*M_PI)*(1800.0/M_PI)) ) );

        // TODO(F2): Missing functionality in VCL: shearing
        o_rPoint.setX( ::basegfx::fround(aTranslate.getX()) );
        o_rPoint.setY( ::basegfx::fround(aTranslate.getY()) );

        return true;
    }

    static int
    setupOutDevState( OutputDevice&                 rOutDev,
                      const rendering::XCanvas*     pOwner,
                      const rendering::ViewState&   viewState,
                      const rendering::RenderState& renderState )
    {
        ::canvas::tools::verifyInput( renderState,
                                      OSL_THIS_FUNC,
                                      const_cast<rendering::XCanvas*>(pOwner), // only for refcount
                                      2,
                                      3 /* text */ );

        int nTransparency(0);

        // TODO(P2): Don't change clipping all the time, maintain current clip
        // state and change only when update is necessary
        ::canvas::tools::clipOutDev(viewState, renderState, rOutDev);

        Color aColor( COL_WHITE );

        if( renderState.DeviceColor.getLength() > 2 )
        {
            aColor = vcl::unotools::stdColorSpaceSequenceToColor( renderState.DeviceColor );
        }

        // extract alpha, and make color opaque
        // afterwards. Otherwise, OutputDevice won't draw anything
        nTransparency = aColor.GetTransparency();
        aColor.SetTransparency(0);

        rOutDev.SetTextColor( aColor );

        return nTransparency;
    }

    namespace {

    class DeviceSettingsGuard
    {
    private:
        VclPtr<OutputDevice> mpVirtualDevice;
        bool mbMappingWasEnabled;
    public:
        DeviceSettingsGuard(OutputDevice *pVirtualDevice)
            : mpVirtualDevice(pVirtualDevice)
            , mbMappingWasEnabled(mpVirtualDevice->IsMapModeEnabled())
        {
            mpVirtualDevice->Push();
            mpVirtualDevice->EnableMapMode(false);
        }

        ~DeviceSettingsGuard()
        {
            mpVirtualDevice->EnableMapMode(mbMappingWasEnabled);
            mpVirtualDevice->Pop();
        }
    };

    }

    static bool setupTextOutput( OutputDevice&                                     rOutDev,
                          const rendering::XCanvas*                         pOwner,
                          ::Point&                                          o_rOutPos,
                          const rendering::ViewState&                       viewState,
                          const rendering::RenderState&                     renderState,
                          const uno::Reference< rendering::XCanvasFont >&   xFont   )
    {
        setupOutDevState( rOutDev, pOwner, viewState, renderState );

        CanvasFont* pFont = dynamic_cast< CanvasFont* >( xFont.get() );

        ENSURE_ARG_OR_THROW( pFont,
                         "CanvasHelper::setupTextOutput(): Font not compatible with this canvas" );

        vcl::Font aVCLFont = pFont->getVCLFont();

        Color aColor( COL_BLACK );

        if( renderState.DeviceColor.getLength() > 2 )
        {
            aColor = vcl::unotools::stdColorSpaceSequenceToColor(renderState.DeviceColor );
        }

        // setup font color
        aVCLFont.SetColor( aColor );
        aVCLFont.SetFillColor( aColor );

        // no need to replicate this for mp2ndOutDev, we're modifying only aVCLFont here.
        if( !setupFontTransform( rOutDev, o_rOutPos, aVCLFont, viewState, renderState ) )
            return false;

        rOutDev.SetFont( aVCLFont );

        return true;
    }

    uno::Reference< rendering::XCachedPrimitive > CanvasHelper::drawText( const rendering::XCanvas*                         pOwner,
                                                                          const rendering::StringContext&                   text,
                                                                          const uno::Reference< rendering::XCanvasFont >&   xFont,
                                                                          const rendering::ViewState&                       viewState,
                                                                          const rendering::RenderState&                     renderState,
                                                                          sal_Int8                                          textDirection )
    {
#ifdef CAIRO_CANVAS_PERF_TRACE
        struct timespec aTimer;
        mxDevice->startPerfTrace( &aTimer );
#endif

        ENSURE_ARG_OR_THROW( xFont.is(),
                         "CanvasHelper::drawText(): font is NULL");

        if( !mpVirtualDevice )
            mpVirtualDevice = mpSurface->createVirtualDevice();

        if( mpVirtualDevice )
        {
            DeviceSettingsGuard aGuard(mpVirtualDevice.get());

            ::Point aOutpos;
            if( !setupTextOutput( *mpVirtualDevice, pOwner, aOutpos, viewState, renderState, xFont ) )
                return uno::Reference< rendering::XCachedPrimitive >(nullptr); // no output necessary

                // change text direction and layout mode
            ComplexTextLayoutFlags nLayoutMode(ComplexTextLayoutFlags::Default);
            switch( textDirection )
            {
                case rendering::TextDirection::WEAK_LEFT_TO_RIGHT:
                case rendering::TextDirection::STRONG_LEFT_TO_RIGHT:
                    nLayoutMode |= ComplexTextLayoutFlags::BiDiStrong;
                    nLayoutMode |= ComplexTextLayoutFlags::TextOriginLeft;
                    break;

                case rendering::TextDirection::WEAK_RIGHT_TO_LEFT:
                    nLayoutMode |= ComplexTextLayoutFlags::BiDiRtl;
                    [[fallthrough]];
                case rendering::TextDirection::STRONG_RIGHT_TO_LEFT:
                    nLayoutMode |= ComplexTextLayoutFlags::BiDiRtl | ComplexTextLayoutFlags::BiDiStrong;
                    nLayoutMode |= ComplexTextLayoutFlags::TextOriginRight;
                    break;
            }

            // TODO(F2): alpha
            mpVirtualDevice->SetLayoutMode( nLayoutMode );

            rtl::Reference pTextLayout( new TextLayout(text, textDirection, 0, CanvasFont::Reference(dynamic_cast< CanvasFont* >( xFont.get() )), mpSurfaceProvider) );
            pTextLayout->draw(*mpVirtualDevice, aOutpos, viewState, renderState);
        }

        return uno::Reference< rendering::XCachedPrimitive >(nullptr);
    }

    uno::Reference< rendering::XCachedPrimitive > CanvasHelper::drawTextLayout( const rendering::XCanvas*                       pOwner,
                                                                                const uno::Reference< rendering::XTextLayout >& xLayoutedText,
                                                                                const rendering::ViewState&                     viewState,
                                                                                const rendering::RenderState&                   renderState )
    {
        ENSURE_ARG_OR_THROW( xLayoutedText.is(),
                         "CanvasHelper::drawTextLayout(): layout is NULL");

        TextLayout* pTextLayout = dynamic_cast< TextLayout* >( xLayoutedText.get() );

        if( pTextLayout )
        {
            if( !mpVirtualDevice )
                mpVirtualDevice = mpSurface->createVirtualDevice();

            if( mpVirtualDevice )
            {
                DeviceSettingsGuard aGuard(mpVirtualDevice.get());

                // TODO(T3): Race condition. We're taking the font
                // from xLayoutedText, and then calling draw() at it,
                // without exclusive access. Move setupTextOutput(),
                // e.g. to impltools?

                ::Point aOutpos;
                if( !setupTextOutput( *mpVirtualDevice, pOwner, aOutpos, viewState, renderState, xLayoutedText->getFont() ) )
                    return uno::Reference< rendering::XCachedPrimitive >(nullptr); // no output necessary

                // TODO(F2): What about the offset scalings?
                pTextLayout->draw(*mpVirtualDevice, aOutpos, viewState, renderState);
            }
        }
        else
        {
            ENSURE_ARG_OR_THROW( false,
                             "CanvasHelper::drawTextLayout(): TextLayout not compatible with this canvas" );
        }

        return uno::Reference< rendering::XCachedPrimitive >(nullptr);
    }

}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */