summaryrefslogtreecommitdiffstats
path: root/src/gui/painting/qpixellayout_p.h
blob: 99a781b49bf0bef79dfbf4a5e98ef3f769d6818d (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
/****************************************************************************
**
** Copyright (C) 2020 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QPIXELLAYOUT_P_H
#define QPIXELLAYOUT_P_H

//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//

#include <QtCore/qvector.h>
#include <QtGui/qimage.h>
#include <QtGui/qrgba64.h>

QT_BEGIN_NAMESPACE

enum QtPixelOrder {
    PixelOrderRGB,
    PixelOrderBGR
};

template<enum QtPixelOrder> inline uint qConvertArgb32ToA2rgb30(QRgb);

template<enum QtPixelOrder> inline uint qConvertRgb32ToRgb30(QRgb);

template<enum QtPixelOrder> inline QRgb qConvertA2rgb30ToArgb32(uint c);

// A combined unpremultiply and premultiply with new simplified alpha.
// Needed when alpha loses precision relative to other colors during conversion (ARGB32 -> A2RGB30).
template<unsigned int Shift>
inline QRgb qRepremultiply(QRgb p)
{
    const uint alpha = qAlpha(p);
    if (alpha == 255 || alpha == 0)
        return p;
    p = qUnpremultiply(p);
    Q_CONSTEXPR  uint mult = 255 / (255 >> Shift);
    const uint newAlpha = mult * (alpha >> Shift);
    p = (p & ~0xff000000) | (newAlpha<<24);
    return qPremultiply(p);
}

template<unsigned int Shift>
inline QRgba64 qRepremultiply(QRgba64 p)
{
    const uint alpha = p.alpha();
    if (alpha == 65535 || alpha == 0)
        return p;
    p = p.unpremultiplied();
    Q_CONSTEXPR  uint mult = 65535 / (65535 >> Shift);
    p.setAlpha(mult * (alpha >> Shift));
    return p.premultiplied();
}

template<>
inline uint qConvertArgb32ToA2rgb30<PixelOrderBGR>(QRgb c)
{
    c = qRepremultiply<6>(c);
    return (c & 0xc0000000)
        | (((c << 22) & 0x3fc00000) | ((c << 14) & 0x00300000))
        | (((c << 4)  & 0x000ff000) | ((c >> 4)  & 0x00000c00))
        | (((c >> 14) & 0x000003fc) | ((c >> 22) & 0x00000003));
}

template<>
inline uint qConvertArgb32ToA2rgb30<PixelOrderRGB>(QRgb c)
{
    c = qRepremultiply<6>(c);
    return (c & 0xc0000000)
        | (((c << 6) & 0x3fc00000) | ((c >> 2) & 0x00300000))
        | (((c << 4) & 0x000ff000) | ((c >> 4) & 0x00000c00))
        | (((c << 2) & 0x000003fc) | ((c >> 6) & 0x00000003));
}

template<>
inline uint qConvertRgb32ToRgb30<PixelOrderBGR>(QRgb c)
{
    return 0xc0000000
        | (((c << 22) & 0x3fc00000) | ((c << 14) & 0x00300000))
        | (((c << 4)  & 0x000ff000) | ((c >> 4)  & 0x00000c00))
        | (((c >> 14) & 0x000003fc) | ((c >> 22) & 0x00000003));
}

template<>
inline uint qConvertRgb32ToRgb30<PixelOrderRGB>(QRgb c)
{
    return 0xc0000000
        | (((c << 6) & 0x3fc00000) | ((c >> 2) & 0x00300000))
        | (((c << 4) & 0x000ff000) | ((c >> 4) & 0x00000c00))
        | (((c << 2) & 0x000003fc) | ((c >> 6) & 0x00000003));
}

template<>
inline QRgb qConvertA2rgb30ToArgb32<PixelOrderBGR>(uint c)
{
    uint a = c >> 30;
    a |= a << 2;
    a |= a << 4;
    return (a << 24)
        | ((c << 14) & 0x00ff0000)
        | ((c >> 4)  & 0x0000ff00)
        | ((c >> 22) & 0x000000ff);
}

template<>
inline QRgb qConvertA2rgb30ToArgb32<PixelOrderRGB>(uint c)
{
    uint a = c >> 30;
    a |= a << 2;
    a |= a << 4;
    return (a << 24)
        | ((c >> 6) & 0x00ff0000)
        | ((c >> 4) & 0x0000ff00)
        | ((c >> 2) & 0x000000ff);
}

template<enum QtPixelOrder> inline QRgba64 qConvertA2rgb30ToRgb64(uint rgb);

template<>
inline QRgba64 qConvertA2rgb30ToRgb64<PixelOrderBGR>(uint rgb)
{
    quint16 alpha = rgb >> 30;
    quint16 blue  = (rgb >> 20) & 0x3ff;
    quint16 green = (rgb >> 10) & 0x3ff;
    quint16 red   = rgb & 0x3ff;
    // Expand the range.
    alpha |= (alpha << 2);
    alpha |= (alpha << 4);
    alpha |= (alpha << 8);
    red   = (red   << 6) | (red   >> 4);
    green = (green << 6) | (green >> 4);
    blue  = (blue  << 6) | (blue  >> 4);
    return qRgba64(red, green, blue, alpha);
}

template<>
inline QRgba64 qConvertA2rgb30ToRgb64<PixelOrderRGB>(uint rgb)
{
    quint16 alpha = rgb >> 30;
    quint16 red   = (rgb >> 20) & 0x3ff;
    quint16 green = (rgb >> 10) & 0x3ff;
    quint16 blue  = rgb & 0x3ff;
    // Expand the range.
    alpha |= (alpha << 2);
    alpha |= (alpha << 4);
    alpha |= (alpha << 8);
    red   = (red   << 6) | (red   >> 4);
    green = (green << 6) | (green >> 4);
    blue  = (blue  << 6) | (blue  >> 4);
    return qRgba64(red, green, blue, alpha);
}

template<enum QtPixelOrder> inline unsigned int qConvertRgb64ToRgb30(QRgba64);

template<>
inline unsigned int qConvertRgb64ToRgb30<PixelOrderBGR>(QRgba64 c)
{
    c = qRepremultiply<14>(c);
    const uint a = c.alpha() >> 14;
    const uint r = c.red()   >> 6;
    const uint g = c.green() >> 6;
    const uint b = c.blue()  >> 6;
    return (a << 30) | (b << 20) | (g << 10) | r;
}

template<>
inline unsigned int qConvertRgb64ToRgb30<PixelOrderRGB>(QRgba64 c)
{
    c = qRepremultiply<14>(c);
    const uint a = c.alpha() >> 14;
    const uint r = c.red()   >> 6;
    const uint g = c.green() >> 6;
    const uint b = c.blue()  >> 6;
    return (a << 30) | (r << 20) | (g << 10) | b;
}

inline uint qRgbSwapRgb30(uint c)
{
    const uint ag = c & 0xc00ffc00;
    const uint rb = c & 0x3ff003ff;
    return ag | (rb << 20) | (rb >> 20);
}

#if Q_BYTE_ORDER == Q_BIG_ENDIAN
Q_ALWAYS_INLINE quint32 RGBA2ARGB(quint32 x) {
    quint32 rgb = x >> 8;
    quint32 a = x << 24;
    return a | rgb;
}

Q_ALWAYS_INLINE quint32 ARGB2RGBA(quint32 x) {
    quint32 rgb = x << 8;
    quint32 a = x >> 24;
    return a | rgb;
}
#else
Q_ALWAYS_INLINE quint32 RGBA2ARGB(quint32 x) {
    // RGBA8888 is ABGR32 on little endian.
    quint32 ag = x & 0xff00ff00;
    quint32 rg = x & 0x00ff00ff;
    return ag | (rg  << 16) | (rg >> 16);
}

Q_ALWAYS_INLINE quint32 ARGB2RGBA(quint32 x) {
    return RGBA2ARGB(x);
}
#endif

// We manually unalias the variables to make sure the compiler
// fully optimizes both aliased and unaliased cases.
#define UNALIASED_CONVERSION_LOOP(buffer, src, count, conversion) \
    if (src == buffer) { \
        for (int i = 0; i < count; ++i) \
            buffer[i] = conversion(buffer[i]); \
    } else { \
        for (int i = 0; i < count; ++i) \
            buffer[i] = conversion(src[i]); \
    }


inline const uint *qt_convertARGB32ToARGB32PM(uint *buffer, const uint *src, int count)
{
    UNALIASED_CONVERSION_LOOP(buffer, src, count, qPremultiply);
    return buffer;
}

inline const uint *qt_convertRGBA8888ToARGB32PM(uint *buffer, const uint *src, int count)
{
    UNALIASED_CONVERSION_LOOP(buffer, src, count, [](uint s) { return qPremultiply(RGBA2ARGB(s));});
    return buffer;
}

template<bool RGBA> void qt_convertRGBA64ToARGB32(uint *dst, const QRgba64 *src, int count);

struct QDitherInfo {
    int x;
    int y;
};

typedef const uint *(QT_FASTCALL *FetchAndConvertPixelsFunc)(uint *buffer, const uchar *src, int index, int count,
                                                             const QVector<QRgb> *clut, QDitherInfo *dither);
typedef void (QT_FASTCALL *ConvertAndStorePixelsFunc)(uchar *dest, const uint *src, int index, int count,
                                                      const QVector<QRgb> *clut, QDitherInfo *dither);

typedef const QRgba64 *(QT_FASTCALL *FetchAndConvertPixelsFunc64)(QRgba64 *buffer, const uchar *src, int index, int count,
                                                                 const QVector<QRgb> *clut, QDitherInfo *dither);
typedef void (QT_FASTCALL *ConvertAndStorePixelsFunc64)(uchar *dest, const QRgba64 *src, int index, int count,
                                                        const QVector<QRgb> *clut, QDitherInfo *dither);

typedef void (QT_FASTCALL *ConvertFunc)(uint *buffer, int count, const QVector<QRgb> *clut);
typedef void (QT_FASTCALL *Convert64Func)(quint64 *buffer, int count, const QVector<QRgb> *clut);
typedef const QRgba64 *(QT_FASTCALL *ConvertTo64Func)(QRgba64 *buffer, const uint *src, int count,
                                                      const QVector<QRgb> *clut, QDitherInfo *dither);
typedef void (QT_FASTCALL *RbSwapFunc)(uchar *dst, const uchar *src, int count);

typedef void (*MemRotateFunc)(const uchar *srcPixels, int w, int h, int sbpl, uchar *destPixels, int dbpl);

struct QPixelLayout
{
    // Bits per pixel
    enum BPP {
        BPPNone,
        BPP1MSB,
        BPP1LSB,
        BPP8,
        BPP16,
        BPP24,
        BPP32,
        BPP64,
        BPPCount
    };

    bool hasAlphaChannel;
    bool premultiplied;
    BPP bpp;
    RbSwapFunc rbSwap;
    ConvertFunc convertToARGB32PM;
    ConvertTo64Func convertToRGBA64PM;
    FetchAndConvertPixelsFunc fetchToARGB32PM;
    FetchAndConvertPixelsFunc64 fetchToRGBA64PM;
    ConvertAndStorePixelsFunc storeFromARGB32PM;
    ConvertAndStorePixelsFunc storeFromRGB32;
};

extern ConvertAndStorePixelsFunc64 qStoreFromRGBA64PM[QImage::NImageFormats];

extern QPixelLayout qPixelLayouts[QImage::NImageFormats];

extern MemRotateFunc qMemRotateFunctions[QPixelLayout::BPPCount][3];

QT_END_NAMESPACE

#endif // QPIXELLAYOUT_P_H