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-rw-r--r--src/opengl/qopenglgradientcache.cpp276
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diff --git a/src/opengl/qopenglgradientcache.cpp b/src/opengl/qopenglgradientcache.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the QtOpenGL 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qopenglgradientcache_p.h"
+#include <private/qdrawhelper_p.h>
+#include <private/qopenglcontext_p.h>
+#include <private/qrgba64_p.h>
+#include <QtCore/qmutex.h>
+#include <QtCore/qrandom.h>
+#include "qopenglfunctions.h"
+#include <private/qopenglextensions_p.h>
+
+#ifndef GL_RGBA16
+#define GL_RGBA16 0x805B
+#endif
+
+QT_BEGIN_NAMESPACE
+
+class QOpenGL2GradientCacheWrapper
+{
+public:
+ QOpenGL2GradientCache *cacheForContext(QOpenGLContext *context) {
+ QMutexLocker lock(&m_mutex);
+ return m_resource.value<QOpenGL2GradientCache>(context);
+ }
+
+private:
+ QOpenGLMultiGroupSharedResource m_resource;
+ QMutex m_mutex;
+};
+
+Q_GLOBAL_STATIC(QOpenGL2GradientCacheWrapper, qt_gradient_caches)
+
+QOpenGL2GradientCache::QOpenGL2GradientCache(QOpenGLContext *ctx)
+ : QOpenGLSharedResource(ctx->shareGroup())
+{
+}
+
+QOpenGL2GradientCache::~QOpenGL2GradientCache()
+{
+ cache.clear();
+}
+
+QOpenGL2GradientCache *QOpenGL2GradientCache::cacheForContext(QOpenGLContext *context)
+{
+ return qt_gradient_caches()->cacheForContext(context);
+}
+
+void QOpenGL2GradientCache::invalidateResource()
+{
+ QMutexLocker lock(&m_mutex);
+ cache.clear();
+}
+
+void QOpenGL2GradientCache::freeResource(QOpenGLContext *)
+{
+ cleanCache();
+}
+
+void QOpenGL2GradientCache::cleanCache()
+{
+ QMutexLocker lock(&m_mutex);
+ QOpenGLGradientColorTableHash::const_iterator it = cache.constBegin();
+ QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions();
+ for (; it != cache.constEnd(); ++it) {
+ const CacheInfo &cache_info = it.value();
+ funcs->glDeleteTextures(1, &cache_info.texId);
+ }
+ cache.clear();
+}
+
+GLuint QOpenGL2GradientCache::getBuffer(const QGradient &gradient, qreal opacity)
+{
+ quint64 hash_val = 0;
+
+ const QGradientStops stops = gradient.stops();
+ for (int i = 0; i < stops.size() && i <= 2; i++)
+ hash_val += stops[i].second.rgba();
+
+ const QMutexLocker lock(&m_mutex);
+ QOpenGLGradientColorTableHash::const_iterator it = cache.constFind(hash_val);
+
+ if (it == cache.constEnd())
+ return addCacheElement(hash_val, gradient, opacity);
+ else {
+ do {
+ const CacheInfo &cache_info = it.value();
+ if (cache_info.stops == stops && cache_info.opacity == opacity
+ && cache_info.interpolationMode == gradient.interpolationMode())
+ {
+ return cache_info.texId;
+ }
+ ++it;
+ } while (it != cache.constEnd() && it.key() == hash_val);
+ // an exact match for these stops and opacity was not found, create new cache
+ return addCacheElement(hash_val, gradient, opacity);
+ }
+}
+
+
+GLuint QOpenGL2GradientCache::addCacheElement(quint64 hash_val, const QGradient &gradient, qreal opacity)
+{
+ QOpenGLFunctions *funcs = QOpenGLContext::currentContext()->functions();
+ if (cache.size() == maxCacheSize()) {
+ int elem_to_remove = QRandomGenerator::global()->bounded(maxCacheSize());
+ quint64 key = cache.keys()[elem_to_remove];
+
+ // need to call glDeleteTextures on each removed cache entry:
+ QOpenGLGradientColorTableHash::const_iterator it = cache.constFind(key);
+ do {
+ funcs->glDeleteTextures(1, &it.value().texId);
+ } while (++it != cache.constEnd() && it.key() == key);
+ cache.remove(key); // may remove more than 1, but OK
+ }
+
+ CacheInfo cache_entry(gradient.stops(), opacity, gradient.interpolationMode());
+ funcs->glGenTextures(1, &cache_entry.texId);
+ funcs->glBindTexture(GL_TEXTURE_2D, cache_entry.texId);
+ if (static_cast<QOpenGLExtensions *>(funcs)->hasOpenGLExtension(QOpenGLExtensions::Sized16Formats)) {
+ QRgba64 buffer[1024];
+ generateGradientColorTable(gradient, buffer, paletteSize(), opacity);
+ funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA16, paletteSize(), 1,
+ 0, GL_RGBA, GL_UNSIGNED_SHORT, buffer);
+ } else {
+ uint buffer[1024];
+ generateGradientColorTable(gradient, buffer, paletteSize(), opacity);
+ funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, paletteSize(), 1,
+ 0, GL_RGBA, GL_UNSIGNED_BYTE, buffer);
+ }
+ return cache.insert(hash_val, cache_entry).value().texId;
+}
+
+
+//TODO: Let GL generate the texture using an FBO
+void QOpenGL2GradientCache::generateGradientColorTable(const QGradient& gradient, QRgba64 *colorTable, int size, qreal opacity) const
+{
+ int pos = 0;
+ const QGradientStops s = gradient.stops();
+
+ bool colorInterpolation = (gradient.interpolationMode() == QGradient::ColorInterpolation);
+
+ uint alpha = qRound(opacity * 256);
+ QRgba64 current_color = combineAlpha256(s[0].second.rgba64(), alpha);
+ qreal incr = 1.0 / qreal(size);
+ qreal fpos = 1.5 * incr;
+ colorTable[pos++] = qPremultiply(current_color);
+
+ while (fpos <= s.first().first) {
+ colorTable[pos] = colorTable[pos - 1];
+ pos++;
+ fpos += incr;
+ }
+
+ if (colorInterpolation)
+ current_color = qPremultiply(current_color);
+
+ const int sLast = s.size() - 1;
+ for (int i = 0; i < sLast; ++i) {
+ qreal delta = 1/(s[i+1].first - s[i].first);
+ QRgba64 next_color = combineAlpha256(s[i + 1].second.rgba64(), alpha);
+ if (colorInterpolation)
+ next_color = qPremultiply(next_color);
+
+ while (fpos < s[i+1].first && pos < size) {
+ int dist = int(256 * ((fpos - s[i].first) * delta));
+ int idist = 256 - dist;
+ if (colorInterpolation)
+ colorTable[pos] = interpolate256(current_color, idist, next_color, dist);
+ else
+ colorTable[pos] = qPremultiply(interpolate256(current_color, idist, next_color, dist));
+ ++pos;
+ fpos += incr;
+ }
+ current_color = next_color;
+ }
+
+ Q_ASSERT(s.size() > 0);
+
+ QRgba64 last_color = qPremultiply(combineAlpha256(s[sLast].second.rgba64(), alpha));
+ for (;pos < size; ++pos)
+ colorTable[pos] = last_color;
+
+ // Make sure the last color stop is represented at the end of the table
+ colorTable[size-1] = last_color;
+}
+
+void QOpenGL2GradientCache::generateGradientColorTable(const QGradient& gradient, uint *colorTable, int size, qreal opacity) const
+{
+ int pos = 0;
+ const QGradientStops s = gradient.stops();
+
+ bool colorInterpolation = (gradient.interpolationMode() == QGradient::ColorInterpolation);
+
+ uint alpha = qRound(opacity * 256);
+ // Qt LIES! It returns ARGB (on little-endian AND on big-endian)
+ uint current_color = ARGB_COMBINE_ALPHA(s[0].second.rgba(), alpha);
+ qreal incr = 1.0 / qreal(size);
+ qreal fpos = 1.5 * incr;
+ colorTable[pos++] = ARGB2RGBA(qPremultiply(current_color));
+
+ while (fpos <= s.first().first) {
+ colorTable[pos] = colorTable[pos - 1];
+ pos++;
+ fpos += incr;
+ }
+
+ if (colorInterpolation)
+ current_color = qPremultiply(current_color);
+
+ const int sLast = s.size() - 1;
+ for (int i = 0; i < sLast; ++i) {
+ qreal delta = 1/(s[i+1].first - s[i].first);
+ uint next_color = ARGB_COMBINE_ALPHA(s[i + 1].second.rgba(), alpha);
+ if (colorInterpolation)
+ next_color = qPremultiply(next_color);
+
+ while (fpos < s[i+1].first && pos < size) {
+ int dist = int(256 * ((fpos - s[i].first) * delta));
+ int idist = 256 - dist;
+ if (colorInterpolation)
+ colorTable[pos] = ARGB2RGBA(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist));
+ else
+ colorTable[pos] = ARGB2RGBA(qPremultiply(INTERPOLATE_PIXEL_256(current_color, idist, next_color, dist)));
+ ++pos;
+ fpos += incr;
+ }
+ current_color = next_color;
+ }
+
+ Q_ASSERT(s.size() > 0);
+
+ uint last_color = ARGB2RGBA(qPremultiply(ARGB_COMBINE_ALPHA(s[sLast].second.rgba(), alpha)));
+ for (;pos < size; ++pos)
+ colorTable[pos] = last_color;
+
+ // Make sure the last color stop is represented at the end of the table
+ colorTable[size-1] = last_color;
+}
+
+QT_END_NAMESPACE