[2] | 1 | /****************************************************************************
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| 2 | **
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[651] | 3 | ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
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[561] | 4 | ** All rights reserved.
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| 5 | ** Contact: Nokia Corporation ([email protected])
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[2] | 6 | **
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| 7 | ** This file is part of the QtOpenGL module of the Qt Toolkit.
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| 8 | **
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| 9 | ** $QT_BEGIN_LICENSE:LGPL$
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| 10 | ** Commercial Usage
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| 11 | ** Licensees holding valid Qt Commercial licenses may use this file in
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| 12 | ** accordance with the Qt Commercial License Agreement provided with the
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| 13 | ** Software or, alternatively, in accordance with the terms contained in
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| 14 | ** a written agreement between you and Nokia.
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| 15 | **
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| 16 | ** GNU Lesser General Public License Usage
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| 17 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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| 18 | ** General Public License version 2.1 as published by the Free Software
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| 19 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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| 20 | ** packaging of this file. Please review the following information to
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| 21 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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| 22 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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| 23 | **
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[561] | 24 | ** In addition, as a special exception, Nokia gives you certain additional
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| 25 | ** rights. These rights are described in the Nokia Qt LGPL Exception
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| 26 | ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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[2] | 27 | **
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| 28 | ** GNU General Public License Usage
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| 29 | ** Alternatively, this file may be used under the terms of the GNU
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| 30 | ** General Public License version 3.0 as published by the Free Software
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| 31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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| 32 | ** packaging of this file. Please review the following information to
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| 33 | ** ensure the GNU General Public License version 3.0 requirements will be
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| 34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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| 35 | **
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[561] | 36 | ** If you have questions regarding the use of this file, please contact
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| 37 | ** Nokia at [email protected].
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[2] | 38 | ** $QT_END_LICENSE$
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| 39 | **
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| 40 | ****************************************************************************/
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| 41 |
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| 42 | #include <private/qdrawhelper_p.h>
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| 43 | #include <private/qgl_p.h>
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| 44 |
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| 45 | #include "qglgradientcache_p.h"
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| 46 |
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[561] | 47 | QT_BEGIN_NAMESPACE
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| 48 |
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| 49 | static void QGL2GradientCache_free(void *ptr)
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| 50 | {
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| 51 | delete reinterpret_cast<QGL2GradientCache *>(ptr);
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| 52 | }
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| 53 |
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| 54 | Q_GLOBAL_STATIC_WITH_ARGS(QGLContextResource, qt_gradient_caches, (QGL2GradientCache_free))
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| 55 |
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| 56 | QGL2GradientCache *QGL2GradientCache::cacheForContext(const QGLContext *context)
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| 57 | {
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| 58 | QGL2GradientCache *p = reinterpret_cast<QGL2GradientCache *>(qt_gradient_caches()->value(context));
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| 59 | if (!p) {
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| 60 | QGLShareContextScope scope(context);
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| 61 | p = new QGL2GradientCache;
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| 62 | qt_gradient_caches()->insert(context, p);
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| 63 | }
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| 64 | return p;
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| 65 | }
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| 66 |
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| 67 | void QGL2GradientCache::cleanCache() {
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[2] | 68 | QGLGradientColorTableHash::const_iterator it = cache.constBegin();
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| 69 | for (; it != cache.constEnd(); ++it) {
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| 70 | const CacheInfo &cache_info = it.value();
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| 71 | glDeleteTextures(1, &cache_info.texId);
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| 72 | }
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| 73 | cache.clear();
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| 74 | }
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| 75 |
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[561] | 76 | GLuint QGL2GradientCache::getBuffer(const QGradient &gradient, qreal opacity)
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[2] | 77 | {
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| 78 | quint64 hash_val = 0;
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| 79 |
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| 80 | QGradientStops stops = gradient.stops();
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| 81 | for (int i = 0; i < stops.size() && i <= 2; i++)
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| 82 | hash_val += stops[i].second.rgba();
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| 83 |
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| 84 | QGLGradientColorTableHash::const_iterator it = cache.constFind(hash_val);
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| 85 |
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| 86 | if (it == cache.constEnd())
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| 87 | return addCacheElement(hash_val, gradient, opacity);
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| 88 | else {
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| 89 | do {
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| 90 | const CacheInfo &cache_info = it.value();
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| 91 | if (cache_info.stops == stops && cache_info.opacity == opacity && cache_info.interpolationMode == gradient.interpolationMode()) {
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| 92 | return cache_info.texId;
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| 93 | }
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| 94 | ++it;
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| 95 | } while (it != cache.constEnd() && it.key() == hash_val);
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| 96 | // an exact match for these stops and opacity was not found, create new cache
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| 97 | return addCacheElement(hash_val, gradient, opacity);
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| 98 | }
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| 99 | }
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| 100 |
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| 101 |
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[561] | 102 | GLuint QGL2GradientCache::addCacheElement(quint64 hash_val, const QGradient &gradient, qreal opacity)
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[2] | 103 | {
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| 104 | if (cache.size() == maxCacheSize()) {
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| 105 | int elem_to_remove = qrand() % maxCacheSize();
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| 106 | quint64 key = cache.keys()[elem_to_remove];
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| 107 |
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| 108 | // need to call glDeleteTextures on each removed cache entry:
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| 109 | QGLGradientColorTableHash::const_iterator it = cache.constFind(key);
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| 110 | do {
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| 111 | glDeleteTextures(1, &it.value().texId);
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| 112 | } while (++it != cache.constEnd() && it.key() == key);
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| 113 | cache.remove(key); // may remove more than 1, but OK
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| 114 | }
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| 115 |
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| 116 | CacheInfo cache_entry(gradient.stops(), opacity, gradient.interpolationMode());
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| 117 | uint buffer[1024];
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| 118 | generateGradientColorTable(gradient, buffer, paletteSize(), opacity);
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| 119 | glGenTextures(1, &cache_entry.texId);
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| 120 | glBindTexture(GL_TEXTURE_2D, cache_entry.texId);
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| 121 | glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, paletteSize(), 1,
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| 122 | 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
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| 123 | return cache.insert(hash_val, cache_entry).value().texId;
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| 124 | }
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| 125 |
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| 126 |
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[561] | 127 | // GL's expects pixels in RGBA (when using GL_RGBA), bin-endian (ABGR on x86).
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| 128 | // Qt always stores in ARGB reguardless of the byte-order the mancine uses.
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[2] | 129 | static inline uint qtToGlColor(uint c)
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| 130 | {
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| 131 | uint o;
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| 132 | #if Q_BYTE_ORDER == Q_LITTLE_ENDIAN
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[561] | 133 | o = (c & 0xff00ff00) // alpha & green already in the right place
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| 134 | | ((c >> 16) & 0x000000ff) // red
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| 135 | | ((c << 16) & 0x00ff0000); // blue
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[2] | 136 | #else //Q_BIG_ENDIAN
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[561] | 137 | o = (c << 8)
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| 138 | | ((c >> 24) & 0x000000ff);
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[2] | 139 | #endif // Q_BYTE_ORDER
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| 140 | return o;
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| 141 | }
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| 142 |
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| 143 | //TODO: Let GL generate the texture using an FBO
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[561] | 144 | void QGL2GradientCache::generateGradientColorTable(const QGradient& gradient, uint *colorTable, int size, qreal opacity) const
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[2] | 145 | {
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| 146 | int pos = 0;
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| 147 | QGradientStops s = gradient.stops();
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| 148 | QVector<uint> colors(s.size());
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| 149 |
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| 150 | for (int i = 0; i < s.size(); ++i)
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[561] | 151 | colors[i] = s[i].second.rgba(); // Qt LIES! It returns ARGB (on little-endian AND on big-endian)
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[2] | 152 |
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| 153 | bool colorInterpolation = (gradient.interpolationMode() == QGradient::ColorInterpolation);
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| 154 |
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| 155 | uint alpha = qRound(opacity * 256);
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| 156 | uint current_color = ARGB_COMBINE_ALPHA(colors[0], alpha);
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| 157 | qreal incr = 1.0 / qreal(size);
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| 158 | qreal fpos = 1.5 * incr;
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| 159 | colorTable[pos++] = qtToGlColor(PREMUL(current_color));
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| 160 |
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| 161 | while (fpos <= s.first().first) {
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| 162 | colorTable[pos] = colorTable[pos - 1];
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| 163 | pos++;
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| 164 | fpos += incr;
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| 165 | }
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| 166 |
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| 167 | if (colorInterpolation)
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| 168 | current_color = PREMUL(current_color);
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| 169 |
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| 170 | for (int i = 0; i < s.size() - 1; ++i) {
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| 171 | qreal delta = 1/(s[i+1].first - s[i].first);
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| 172 | uint next_color = ARGB_COMBINE_ALPHA(colors[i+1], alpha);
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| 173 | if (colorInterpolation)
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| 174 | next_color = PREMUL(next_color);
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| 175 |
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| 176 | while (fpos < s[i+1].first && pos < size) {
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| 177 | int dist = int(256 * ((fpos - s[i].first) * delta));
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| 178 | int idist = 256 - dist;
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| 179 | if (colorInterpolation)
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| 180 | colorTable[pos] = qtToGlColor(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist));
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| 181 | else
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| 182 | colorTable[pos] = qtToGlColor(PREMUL(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist)));
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| 183 | ++pos;
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| 184 | fpos += incr;
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| 185 | }
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| 186 | current_color = next_color;
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| 187 | }
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| 188 |
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| 189 | Q_ASSERT(s.size() > 0);
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| 190 |
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| 191 | uint last_color = qtToGlColor(PREMUL(ARGB_COMBINE_ALPHA(colors[s.size() - 1], alpha)));
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| 192 | for (;pos < size; ++pos)
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| 193 | colorTable[pos] = last_color;
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| 194 |
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| 195 | // Make sure the last color stop is represented at the end of the table
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| 196 | colorTable[size-1] = last_color;
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| 197 | }
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[561] | 198 |
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| 199 | QT_END_NAMESPACE
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