summaryrefslogtreecommitdiff
path: root/vcl/win/gdi/winlayout.cxx
blob: facaf82ad93c732347c02e708fe6d6d8b59a6cd1 (plain)
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
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
/* -*- 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 <memory>
#include "osl/module.h"
#include "osl/file.h"

#include <comphelper/windowserrorstring.hxx>

#include <opengl/texture.hxx>
#include <opengl/win/gdiimpl.hxx>

#include <vcl/opengl/OpenGLHelper.hxx>
#include <win/salgdi.h>
#include <win/saldata.hxx>
#include <outdev.h>

#include "win/DWriteTextRenderer.hxx"

#include "sft.hxx"
#include "sallayout.hxx"
#include "CommonSalLayout.hxx"
#include "win/ScopedHDC.hxx"

#include <cstdio>
#include <cstdlib>

#include <rtl/character.hxx>

#include <algorithm>

#include <shlwapi.h>
#include <winver.h>

GlobalGlyphCache * GlobalGlyphCache::get() {
    SalData * data = GetSalData();
    if (!data->m_pGlobalGlyphCache) {
        data->m_pGlobalGlyphCache.reset(new GlobalGlyphCache);
    }
    return data->m_pGlobalGlyphCache.get();
}

bool WinFontInstance::CacheGlyphToAtlas(HDC hDC, HFONT hFont, int nGlyphIndex, SalGraphics& rGraphics)
{
    OpenGLGlyphDrawElement aElement;

    ScopedHDC aHDC(CreateCompatibleDC(hDC));

    if (!aHDC)
    {
        SAL_WARN("vcl.gdi", "CreateCompatibleDC failed: " << WindowsErrorString(GetLastError()));
        return false;
    }
    HFONT hOrigFont = static_cast<HFONT>(SelectObject(aHDC.get(), hFont));
    if (hOrigFont == nullptr)
    {
        SAL_WARN("vcl.gdi", "SelectObject failed: " << WindowsErrorString(GetLastError()));
        return false;
    }

    // For now we assume DWrite is present and we won't bother with fallback paths.
    D2DWriteTextOutRenderer * pTxt = dynamic_cast<D2DWriteTextOutRenderer *>(&TextOutRenderer::get(true));
    if (!pTxt)
        return false;

    pTxt->setTextAntiAliasMode(D2DTextAntiAliasMode::AntiAliased);

    if (!pTxt->BindFont(aHDC.get()))
    {
        SAL_WARN("vcl.gdi", "Binding of font failed. The font might not be supported by Direct Write.");
        return false;
    }

    std::vector<WORD> aGlyphIndices(1);
    aGlyphIndices[0] = nGlyphIndex;
    // Fetch the ink boxes and calculate the size of the atlas.
    tools::Rectangle bounds(0, 0, 0, 0);
    auto aInkBoxes = pTxt->GetGlyphInkBoxes(aGlyphIndices.data(), aGlyphIndices.data() + 1);
    if (aInkBoxes.empty())
        return false;

    for (auto &box : aInkBoxes)
        bounds.Union(box + Point(bounds.Right(), 0));

    // bounds.Top() is the offset from the baseline at (0,0) to the top of the
    // inkbox.
    aElement.mnBaselineOffset = -bounds.Top();
    aElement.mnHeight = bounds.getHeight();
    aElement.mbVertical = false;

    // Try hard to avoid overlap as we want to be able to use
    // individual rectangles for each glyph. The ABC widths don't
    // take anti-aliasing into consideration. Let's hope that leaving
    // "extra" space between glyphs will help.
    std::vector<float> aGlyphAdv(1);   // offsets between glyphs
    std::vector<DWRITE_GLYPH_OFFSET> aGlyphOffset(1, DWRITE_GLYPH_OFFSET{0.0f, 0.0f});
    std::vector<int> aEnds(1); // end of each glyph box
    float totWidth = 0;
    {
        int overhang = aInkBoxes[0].Left();
        int blackWidth = aInkBoxes[0].getWidth(); // width of non-AA pixels
        aElement.maLeftOverhangs = overhang;

        aGlyphAdv[0] = blackWidth + aElement.getExtraSpace();
        aGlyphOffset[0].advanceOffset = -overhang;

        totWidth += aGlyphAdv[0];
        aEnds[0] = totWidth;
    }
    // Leave extra space also at top and bottom
    int nBitmapWidth = totWidth;
    int nBitmapHeight = bounds.getHeight() + aElement.getExtraSpace();

    UINT nPos = 0;

    // FIXME: really I don't get why 'vertical' makes any difference [!] what does it mean !?
    if (aElement.mbVertical)
    {
        aElement.maLocation.Left() = 0;
        aElement.maLocation.Right() = nBitmapWidth;
        aElement.maLocation.Top() = nPos;
        aElement.maLocation.Bottom() = nPos + aGlyphAdv[0] + aElement.maLeftOverhangs;
    }
    else
    {
        aElement.maLocation.Left() = nPos;
        aElement.maLocation.Right() = aEnds[0];
        aElement.maLocation.Top() = 0;
        aElement.maLocation.Bottom() = bounds.getHeight() + aElement.getExtraSpace();
    }
    nPos = aEnds[0];

    OpenGLCompatibleDC aDC(rGraphics, 0, 0, nBitmapWidth, nBitmapHeight);

    SetTextColor(aDC.getCompatibleHDC(), RGB(0, 0, 0));
    SetBkColor(aDC.getCompatibleHDC(), RGB(255, 255, 255));

    aDC.fill(MAKE_SALCOLOR(0xff, 0xff, 0xff));

    pTxt->BindDC(aDC.getCompatibleHDC(), tools::Rectangle(0, 0, nBitmapWidth, nBitmapHeight));
    auto pRT = pTxt->GetRenderTarget();

    ID2D1SolidColorBrush* pBrush = nullptr;
    if (!SUCCEEDED(pRT->CreateSolidColorBrush(D2D1::ColorF(D2D1::ColorF::Black), &pBrush)))
    {
        pTxt->ReleaseFont();
        return false;
    }

    D2D1_POINT_2F baseline = {
        aElement.getExtraOffset(),
        aElement.getExtraOffset() + aElement.mnBaselineOffset
    };

    DWRITE_GLYPH_RUN glyphs = {
        pTxt->GetFontFace(),
        pTxt->GetEmHeight(),
        1,
        aGlyphIndices.data(),
        aGlyphAdv.data(),
        aGlyphOffset.data(),
        false,
        0
    };

    pRT->BeginDraw();
    pTxt->applyTextAntiAliasMode();
    pRT->DrawGlyphRun(baseline, &glyphs, pBrush);
    HRESULT hResult = pRT->EndDraw();

    pBrush->Release();

    switch (hResult)
    {
    case S_OK:
        break;
    case D2DERR_RECREATE_TARGET:
        pTxt->CreateRenderTarget();
        break;
    default:
        SAL_WARN("vcl.gdi", "DrawGlyphRun-EndDraw failed: " << WindowsErrorString(GetLastError()));
        SelectFont(aDC.getCompatibleHDC(), hOrigFont);
        return false;
    }

    pTxt->ReleaseFont();

    if (!GlyphCache::ReserveTextureSpace(aElement, nBitmapWidth, nBitmapHeight))
        return false;
    if (!aDC.copyToTexture(aElement.maTexture))
        return false;

    maGlyphCache.PutDrawElementInCache(aElement, nGlyphIndex);

    SelectFont(aDC.getCompatibleHDC(), hOrigFont);

    return true;
}

TextOutRenderer & TextOutRenderer::get(bool bUseDWrite)
{
    SalData *const pSalData = GetSalData();

    if (!pSalData)
    {   // don't call this after DeInitVCL()
        fprintf(stderr, "TextOutRenderer fatal error: no SalData");
        abort();
    }

    if (bUseDWrite)
    {
        static bool const bSuccess(D2DWriteTextOutRenderer::InitModules());
        if (bSuccess && !pSalData->m_pD2DWriteTextOutRenderer)
        {
            pSalData->m_pD2DWriteTextOutRenderer.reset(new D2DWriteTextOutRenderer());
        }
        if (pSalData->m_pD2DWriteTextOutRenderer)
        {
            return *pSalData->m_pD2DWriteTextOutRenderer;
        }
        // else: fall back to GDI
    }
    if (!pSalData->m_pExTextOutRenderer)
    {
        pSalData->m_pExTextOutRenderer.reset(new ExTextOutRenderer);
    }
    return *pSalData->m_pExTextOutRenderer;
}


bool ExTextOutRenderer::operator ()(CommonSalLayout const &rLayout,
    SalGraphics & /*rGraphics*/,
    HDC hDC)
{
    HFONT hFont = static_cast<HFONT>(GetCurrentObject( hDC, OBJ_FONT ));
    HFONT hAltFont = nullptr;
    bool bUseAltFont = false;
    if (rLayout.getFontSelData().mbVertical)
    {
        LOGFONTW aLogFont;
        GetObjectW(hFont, sizeof(LOGFONTW), &aLogFont);
        if (aLogFont.lfFaceName[0] == '@')
        {
            memmove(&aLogFont.lfFaceName[0], &aLogFont.lfFaceName[1],
                sizeof(aLogFont.lfFaceName)-sizeof(aLogFont.lfFaceName[0]));
            hAltFont = CreateFontIndirectW(&aLogFont);
        }
    }

    int nStart = 0;
    Point aPos(0, 0);
    const GlyphItem* pGlyph;
    while (rLayout.GetNextGlyphs(1, &pGlyph, aPos, nStart))
    {
        WORD glyphWStr[] = { pGlyph->maGlyphId };
        if (hAltFont && pGlyph->IsVertical() == bUseAltFont)
        {
            bUseAltFont = !bUseAltFont;
            SelectFont(hDC, bUseAltFont ? hAltFont : hFont);
        }
        ExtTextOutW(hDC, aPos.X(), aPos.Y(), ETO_GLYPH_INDEX, nullptr, LPCWSTR(&glyphWStr), 1, nullptr);
    }
    if (hAltFont)
    {
        if (bUseAltFont)
            SelectFont(hDC, hFont);
        DeleteObject(hAltFont);
    }

    return true;
}

SalLayout* WinSalGraphics::GetTextLayout(ImplLayoutArgs& /*rArgs*/, int nFallbackLevel)
{
    if (!mpWinFontEntry[nFallbackLevel])
        return nullptr;

    assert(mpWinFontData[nFallbackLevel]);

    return new CommonSalLayout(getHDC(), *mpWinFontEntry[nFallbackLevel], *mpWinFontData[nFallbackLevel]);
}

LogicalFontInstance * WinSalGraphics::GetWinFontEntry(int const nFallbackLevel)
{
    return mpWinFontEntry[nFallbackLevel];
}

WinFontInstance::WinFontInstance( FontSelectPattern& rFSD )
:   LogicalFontInstance( rFSD )
{
}

WinFontInstance::~WinFontInstance()
{
}

PhysicalFontFace* WinFontFace::Clone() const
{
    if( mpHbFont )
        hb_font_reference( mpHbFont );

    PhysicalFontFace* pClone = new WinFontFace( *this );
    return pClone;
}

LogicalFontInstance* WinFontFace::CreateFontInstance( FontSelectPattern& rFSD ) const
{
    LogicalFontInstance* pFontInstance = new WinFontInstance( rFSD );
    return pFontInstance;
}

bool WinSalGraphics::CacheGlyphs(const CommonSalLayout& rLayout)
{
    static bool bDoGlyphCaching = (std::getenv("SAL_DISABLE_GLYPH_CACHING") == nullptr);
    if (!bDoGlyphCaching)
        return false;

    HDC hDC = getHDC();
    HFONT hFONT = rLayout.getHFONT();
    WinFontInstance& rFont = rLayout.getWinFontInstance();

    int nStart = 0;
    Point aPos(0, 0);
    const GlyphItem* pGlyph;
    while (rLayout.GetNextGlyphs(1, &pGlyph, aPos, nStart))
    {
        if (!rFont.GetGlyphCache().IsGlyphCached(pGlyph->maGlyphId))
        {
            if (!rFont.CacheGlyphToAtlas(hDC, hFONT, pGlyph->maGlyphId, *this))
                return false;
        }
    }

    return true;
}

bool WinSalGraphics::DrawCachedGlyphs(const CommonSalLayout& rLayout)
{
    HDC hDC = getHDC();

    tools::Rectangle aRect;
    rLayout.GetBoundRect(*this, aRect);

    COLORREF color = GetTextColor(hDC);
    SalColor salColor = MAKE_SALCOLOR(GetRValue(color), GetGValue(color), GetBValue(color));

    WinOpenGLSalGraphicsImpl *pImpl = dynamic_cast<WinOpenGLSalGraphicsImpl*>(mpImpl.get());
    if (!pImpl)
        return false;

    WinFontInstance& rFont = rLayout.getWinFontInstance();

    int nStart = 0;
    Point aPos(0, 0);
    const GlyphItem* pGlyph;
    while (rLayout.GetNextGlyphs(1, &pGlyph, aPos, nStart))
    {
        OpenGLGlyphDrawElement& rElement(rFont.GetGlyphCache().GetDrawElement(pGlyph->maGlyphId));
        OpenGLTexture& rTexture = rElement.maTexture;

        if (!rTexture)
            return false;

        SalTwoRect a2Rects(0, 0,
                           rTexture.GetWidth(), rTexture.GetHeight(),
                           aPos.X() - rElement.getExtraOffset() + rElement.maLeftOverhangs,
                           aPos.Y() - rElement.mnBaselineOffset - rElement.getExtraOffset(),
                           rTexture.GetWidth(), rTexture.GetHeight());

        pImpl->DeferredTextDraw(rTexture, salColor, a2Rects);
    }

    return true;
}

void WinSalGraphics::DrawTextLayout(const CommonSalLayout& rLayout, HDC hDC, bool bUseDWrite)
{
    TextOutRenderer &render = TextOutRenderer::get(bUseDWrite);
    render(rLayout, *this, hDC);
}

void WinSalGraphics::DrawTextLayout(const CommonSalLayout& rLayout)
{
    HDC hDC = getHDC();

    // Our DirectWrite renderer is incomplete, skip it for non-horizontal or
    // stretched text.
    bool bForceGDI = rLayout.GetOrientation() || rLayout.hasHScale();

    bool bUseOpenGL = OpenGLHelper::isVCLOpenGLEnabled() && !mbPrinter;
    if (!bUseOpenGL)
    {
        // no OpenGL, just classic rendering
        DrawTextLayout(rLayout, hDC, !bForceGDI);
    }
    else if (!bForceGDI && CacheGlyphs(rLayout) &&
             DrawCachedGlyphs(rLayout))
    {
        // Nothing
    }
    else
    {
        // We have to render the text to a hidden texture, and draw it.
        //
        // Note that Windows GDI does not really support the alpha correctly
        // when drawing - ie. it draws nothing to the alpha channel when
        // rendering the text, even the antialiasing is done as 'real' pixels,
        // not alpha...
        //
        // Luckily, this does not really limit us:
        //
        // To blend properly, we draw the texture, but then use it as an alpha
        // channel for solid color (that will define the text color).  This
        // destroys the subpixel antialiasing - turns it into 'classic'
        // antialiasing - but that is the best we can do, because the subpixel
        // antialiasing needs to know what is in the background: When the
        // background is white, or white-ish, it does the subpixel, but when
        // there is a color, it just darkens the color (and does this even
        // when part of the character is on a colored background, and part on
        // white).  It has to work this way, the results would look strange
        // otherwise.
        //
        // For the GL rendering to work even with the subpixel antialiasing,
        // we would need to get the current texture from the screen, let GDI
        // draw the text to it (so that it can decide well where to use the
        // subpixel and where not), and draw the result - but in that case we
        // don't need alpha anyway.
        //
        // TODO: check the performance of this 2nd approach at some stage and
        // switch to that if it performs well.

        tools::Rectangle aRect;
        rLayout.GetBoundRect(*this, aRect);

        WinOpenGLSalGraphicsImpl *pImpl = dynamic_cast<WinOpenGLSalGraphicsImpl*>(mpImpl.get());

        if (pImpl)
        {
            pImpl->PreDraw();

            OpenGLCompatibleDC aDC(*this, aRect.Left(), aRect.Top(), aRect.GetWidth(), aRect.GetHeight());

            // we are making changes to the DC, make sure we got a new one
            assert(aDC.getCompatibleHDC() != hDC);

            RECT aWinRect = { aRect.Left(), aRect.Top(), aRect.Left() + aRect.GetWidth(), aRect.Top() + aRect.GetHeight() };
            ::FillRect(aDC.getCompatibleHDC(), &aWinRect, static_cast<HBRUSH>(::GetStockObject(WHITE_BRUSH)));

            // setup the hidden DC with black color and white background, we will
            // use the result of the text drawing later as a mask only
            HFONT hOrigFont = ::SelectFont(aDC.getCompatibleHDC(), static_cast<HFONT>(::GetCurrentObject(hDC, OBJ_FONT)));

            ::SetTextColor(aDC.getCompatibleHDC(), RGB(0, 0, 0));
            ::SetBkColor(aDC.getCompatibleHDC(), RGB(255, 255, 255));

            UINT nTextAlign = ::GetTextAlign(hDC);
            ::SetTextAlign(aDC.getCompatibleHDC(), nTextAlign);

            COLORREF color = ::GetTextColor(hDC);
            SalColor salColor = MAKE_SALCOLOR(GetRValue(color), GetGValue(color), GetBValue(color));

            // the actual drawing
            DrawTextLayout(rLayout, aDC.getCompatibleHDC(), !bForceGDI);

            std::unique_ptr<OpenGLTexture> xTexture(aDC.getTexture());
            if (xTexture)
                pImpl->DrawMask(*xTexture, salColor, aDC.getTwoRect());

            ::SelectFont(aDC.getCompatibleHDC(), hOrigFont);

            pImpl->PostDraw();
        }
    }
}

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