qglgradientcache.cpp

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1 /**************************************************************************** -

2 ** -

4 ** Contact: https://www.qt.io/licensing/ -

5 ** -

6 ** This file is part of the QtOpenGL module of the Qt Toolkit. -

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8 ** $QT_BEGIN_LICENSE:LGPL$ -

9 ** Commercial License Usage -

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17 ** GNU Lesser General Public License Usage -

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19 ** General Public License version 3 as published by the Free Software -

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21 ** packaging of this file. Please review the following information to -

22 ** ensure the GNU Lesser General Public License version 3 requirements -

23 ** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. -

24 ** -

25 ** GNU General Public License Usage -

26 ** Alternatively, this file may be used under the terms of the GNU -

27 ** General Public License version 2.0 or (at your option) the GNU General -

28 ** Public license version 3 or any later version approved by the KDE Free -

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31 ** included in the packaging of this file. Please review the following -

32 ** information to ensure the GNU General Public License requirements will -

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35 ** -

36 ** $QT_END_LICENSE$ -

37 ** -

38 ****************************************************************************/ -

39 -

40 #include "qglgradientcache_p.h" -

41 #include <private/qdrawhelper_p.h> -

42 #include <private/qgl_p.h> -

43 #include <QtCore/qmutex.h> -

44 -

45 QT_BEGIN_NAMESPACE -

46 -

47 class QGL2GradientCacheWrapper -

48 { -

49 public: -

50 QGL2GradientCache *cacheForContext(const QGLContext *context) { -

51 QMutexLocker lock(&m_mutex); -

return m_resource.value<QGL2GradientCache>(context->contextHandle());

never executed: return m_resource.value<QGL2GradientCache>(context->contextHandle());

53 } -

54 -

55 private: -

56 QOpenGLMultiGroupSharedResource m_resource; -

57 QMutex m_mutex; -

58 }; -

59 -

Q_GLOBAL_STATIC(QGL2GradientCacheWrapper, qt_gradient_caches)

never executed: end of block

never executed: guard.store(QtGlobalStatic::Destroyed);

never executed: return &holder.value;

guard.load() =...c::Initialized	Description
TRUE	never evaluated
FALSE	never evaluated

61 -

62 QGL2GradientCache::QGL2GradientCache(QOpenGLContext *ctx) -

63 : QOpenGLSharedResource(ctx->shareGroup()) -

64 { -

}

never executed: end of block

66 -

67 QGL2GradientCache::~QGL2GradientCache() -

68 { -

69 cache.clear(); -

}

never executed: end of block

71 -

72 QGL2GradientCache *QGL2GradientCache::cacheForContext(const QGLContext *context) -

73 { -

return qt_gradient_caches()->cacheForContext(context);

never executed: return qt_gradient_caches()->cacheForContext(context);

75 } -

76 -

77 void QGL2GradientCache::invalidateResource() -

78 { -

79 QMutexLocker lock(&m_mutex); -

80 cache.clear(); -

}

never executed: end of block

82 -

83 void QGL2GradientCache::freeResource(QOpenGLContext *) -

84 { -

85 cleanCache(); -

}

never executed: end of block

87 -

88 void QGL2GradientCache::cleanCache() -

89 { -

90 QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions(); -

91 QMutexLocker lock(&m_mutex); -

92 QGLGradientColorTableHash::const_iterator it = cache.constBegin(); -

for (; it != cache.constEnd(); ++it) {

it != cache.constEnd()	Description
TRUE	never evaluated
FALSE	never evaluated

94 const CacheInfo &cache_info = it.value(); -

95 funcs->glDeleteTextures(1, &cache_info.texId); -

}

never executed: end of block

97 cache.clear(); -

}

never executed: end of block

99 -

100 GLuint QGL2GradientCache::getBuffer(const QGradient &gradient, qreal opacity) -

101 { -

102 QMutexLocker lock(&m_mutex); -

103 quint64 hash_val = 0; -

104 -

105 const QGradientStops stops = gradient.stops(); -

106

for (int i = 0; i < stops.size() && i <= 2; i++)

i < stops.size()	Description
TRUE	never evaluated
FALSE	never evaluated

i <= 2	Description
TRUE	never evaluated
FALSE	never evaluated

107

hash_val += stops[i].second.rgba();

never executed: hash_val += stops[i].second.rgba();

108 -

109 QGLGradientColorTableHash::const_iterator it = cache.constFind(hash_val); -

110 -

111

if (it == cache.constEnd())

it == cache.constEnd()	Description
TRUE	never evaluated
FALSE	never evaluated

112

return addCacheElement(hash_val, gradient, opacity);

never executed: return addCacheElement(hash_val, gradient, opacity);

113 else { -

114 do { -

115 const CacheInfo &cache_info = it.value(); -

116

if (cache_info.stops == stops && cache_info.opacity == opacity

cache_info.stops == stops	Description
TRUE	never evaluated
FALSE	never evaluated

cache_info.opacity == opacity	Description
TRUE	never evaluated
FALSE	never evaluated

117

&& cache_info.interpolationMode == gradient.interpolationMode())

cache_info.int...polationMode()	Description
TRUE	never evaluated
FALSE	never evaluated

118 { -

119

return cache_info.texId;

never executed: return cache_info.texId;

120 } -

121 ++it; -

122

} while (it != cache.constEnd() && it.key() == hash_val);

never executed: end of block

it != cache.constEnd()	Description
TRUE	never evaluated
FALSE	never evaluated

it.key() == hash_val	Description
TRUE	never evaluated
FALSE	never evaluated

123 // an exact match for these stops and opacity was not found, create new cache -

124

return addCacheElement(hash_val, gradient, opacity);

never executed: return addCacheElement(hash_val, gradient, opacity);

125 } -

126 } -

127 -

128 -

129 GLuint QGL2GradientCache::addCacheElement(quint64 hash_val, const QGradient &gradient, qreal opacity) -

130 { -

131 QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions(); -

132

if (cache.size() == maxCacheSize()) {

cache.size() == maxCacheSize()	Description
TRUE	never evaluated
FALSE	never evaluated

133 int elem_to_remove = qrand() % maxCacheSize(); -

134 quint64 key = cache.keys()[elem_to_remove]; -

135 -

136 // need to call glDeleteTextures on each removed cache entry: -

137 QGLGradientColorTableHash::const_iterator it = cache.constFind(key); -

138 do { -

139 funcs->glDeleteTextures(1, &it.value().texId); -

140

} while (++it != cache.constEnd() && it.key() == key);

never executed: end of block

++it != cache.constEnd()	Description
TRUE	never evaluated
FALSE	never evaluated

it.key() == key	Description
TRUE	never evaluated
FALSE	never evaluated

141 cache.remove(key); // may remove more than 1, but OK -

142

}

never executed: end of block

143 -

144 CacheInfo cache_entry(gradient.stops(), opacity, gradient.interpolationMode()); -

145 uint buffer[1024]; -

146 generateGradientColorTable(gradient, buffer, paletteSize(), opacity); -

147 funcs->glGenTextures(1, &cache_entry.texId); -

148 funcs->glBindTexture(GL_TEXTURE_2D, cache_entry.texId); -

149 funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, paletteSize(), 1, -

150 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer); -

151

return cache.insert(hash_val, cache_entry).value().texId;

never executed: return cache.insert(hash_val, cache_entry).value().texId;

152 } -

153 -

154 -

155 // GL's expects pixels in RGBA (when using GL_RGBA), bin-endian (ABGR on x86). -

156 // Qt always stores in ARGB reguardless of the byte-order the mancine uses. -

157 static inline uint qtToGlColor(uint c) -

158 { -

159 uint o; -

160 #if Q_BYTE_ORDER == Q_LITTLE_ENDIAN -

161 o = (c & 0xff00ff00) // alpha & green already in the right place -

162 | ((c >> 16) & 0x000000ff) // red -

163 | ((c << 16) & 0x00ff0000); // blue -

164 #else //Q_BIG_ENDIAN -

165 o = (c << 8) -

166 | ((c >> 24) & 0x000000ff); -

167 #endif // Q_BYTE_ORDER -

168

return o;

never executed: return o;

169 } -

170 -

171 //TODO: Let GL generate the texture using an FBO -

172 void QGL2GradientCache::generateGradientColorTable(const QGradient& gradient, uint *colorTable, int size, qreal opacity) const -

173 { -

174 int pos = 0; -

175 const QGradientStops s = gradient.stops(); -

176 bool colorInterpolation = (gradient.interpolationMode() == QGradient::ColorInterpolation); -

177 -

178 uint alpha = qRound(opacity * 256); -

179 // Qt LIES! It returns ARGB (on little-endian AND on big-endian) -

180 uint current_color = ARGB_COMBINE_ALPHA(s[0].second.rgba(), alpha); -

181 qreal incr = 1.0 / qreal(size); -

182 qreal fpos = 1.5 * incr; -

183 colorTable[pos++] = qtToGlColor(qPremultiply(current_color)); -

184 -

185

while (fpos <= s.first().first) {

fpos <= s.first().first	Description
TRUE	never evaluated
FALSE	never evaluated

186 colorTable[pos] = colorTable[pos - 1]; -

187 pos++; -

188 fpos += incr; -

189

}

never executed: end of block

190 -

191

if (colorInterpolation)

colorInterpolation	Description
TRUE	never evaluated
FALSE	never evaluated

192

current_color = qPremultiply(current_color);

never executed: current_color = qPremultiply(current_color);

193 -

194 const int sLast = s.size() - 1; -

195

for (int i = 0; i < sLast; ++i) {

i < sLast	Description
TRUE	never evaluated
FALSE	never evaluated

196 qreal delta = 1/(s[i+1].first - s[i].first); -

197 uint next_color = ARGB_COMBINE_ALPHA(s[i + 1].second.rgba(), alpha); -

198

if (colorInterpolation)

colorInterpolation	Description
TRUE	never evaluated
FALSE	never evaluated

199

next_color = qPremultiply(next_color);

never executed: next_color = qPremultiply(next_color);

200 -

201

while (fpos < s[i+1].first && pos < size) {

fpos < s[i+1].first	Description
TRUE	never evaluated
FALSE	never evaluated

pos < size	Description
TRUE	never evaluated
FALSE	never evaluated

202 int dist = int(256 * ((fpos - s[i].first) * delta)); -

203 int idist = 256 - dist; -

204

if (colorInterpolation)

colorInterpolation	Description
TRUE	never evaluated
FALSE	never evaluated

205

colorTable[pos] = qtToGlColor(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist));

never executed: colorTable[pos] = qtToGlColor(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist));

206 else -

207

colorTable[pos] = qtToGlColor(qPremultiply(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist)));

never executed: colorTable[pos] = qtToGlColor(qPremultiply(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist)));

208 ++pos; -

209 fpos += incr; -

210

}

never executed: end of block

211 current_color = next_color; -

212

}

never executed: end of block

213 -

214 Q_ASSERT(s.size() > 0); -

215 -

216 uint last_color = qtToGlColor(qPremultiply(ARGB_COMBINE_ALPHA(s[sLast].second.rgba(), alpha))); -

217

for (;pos < size; ++pos)

pos < size	Description
TRUE	never evaluated
FALSE	never evaluated

218

colorTable[pos] = last_color;

never executed: colorTable[pos] = last_color;

219 -

220 // Make sure the last color stop is represented at the end of the table -

221 colorTable[size-1] = last_color; -

222

}

never executed: end of block

223 -

224 QT_END_NAMESPACE -

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