464 lines
17 KiB
C++
464 lines
17 KiB
C++
/****************************************************************************
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**
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** Contact: http://www.qt-project.org/legal
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**
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** This file is part of the QtGui module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:LGPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia. For licensing terms and
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** conditions see http://qt.digia.com/licensing. For further information
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** use the contact form at http://qt.digia.com/contact-us.
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**
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** GNU Lesser General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU Lesser
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** General Public License version 2.1 as published by the Free Software
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** Foundation and appearing in the file LICENSE.LGPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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**
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** In addition, as a special exception, Digia gives you certain additional
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** rights. These rights are described in the Digia Qt LGPL Exception
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3.0 as published by the Free Software
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** Foundation and appearing in the file LICENSE.GPL included in the
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** packaging of this file. Please review the following information to
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** ensure the GNU General Public License version 3.0 requirements will be
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** met: http://www.gnu.org/copyleft/gpl.html.
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**
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "qopengltextureglyphcache_p.h"
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#include "qopenglpaintengine_p.h"
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#include "private/qopenglengineshadersource_p.h"
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#include "qopenglextensions_p.h"
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#include <qrgb.h>
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#include <private/qdrawhelper_p.h>
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QT_BEGIN_NAMESPACE
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QBasicAtomicInt qopengltextureglyphcache_serial_number = Q_BASIC_ATOMIC_INITIALIZER(1);
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QOpenGLTextureGlyphCache::QOpenGLTextureGlyphCache(QFontEngine::GlyphFormat format, const QTransform &matrix)
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: QImageTextureGlyphCache(format, matrix)
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, m_textureResource(0)
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, pex(0)
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, m_blitProgram(0)
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, m_filterMode(Nearest)
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, m_serialNumber(qopengltextureglyphcache_serial_number.fetchAndAddRelaxed(1))
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, m_buffer(QOpenGLBuffer::VertexBuffer)
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{
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#ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG
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qDebug(" -> QOpenGLTextureGlyphCache() %p for context %p.", this, QOpenGLContext::currentContext());
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#endif
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m_vertexCoordinateArray[0] = -1.0f;
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m_vertexCoordinateArray[1] = -1.0f;
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m_vertexCoordinateArray[2] = 1.0f;
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m_vertexCoordinateArray[3] = -1.0f;
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m_vertexCoordinateArray[4] = 1.0f;
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m_vertexCoordinateArray[5] = 1.0f;
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m_vertexCoordinateArray[6] = -1.0f;
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m_vertexCoordinateArray[7] = 1.0f;
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m_textureCoordinateArray[0] = 0.0f;
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m_textureCoordinateArray[1] = 0.0f;
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m_textureCoordinateArray[2] = 1.0f;
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m_textureCoordinateArray[3] = 0.0f;
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m_textureCoordinateArray[4] = 1.0f;
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m_textureCoordinateArray[5] = 1.0f;
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m_textureCoordinateArray[6] = 0.0f;
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m_textureCoordinateArray[7] = 1.0f;
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}
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QOpenGLTextureGlyphCache::~QOpenGLTextureGlyphCache()
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{
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#ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG
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qDebug(" -> ~QOpenGLTextureGlyphCache() %p.", this);
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#endif
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clear();
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}
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static inline bool isCoreProfile()
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{
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return QOpenGLContext::currentContext()->format().profile() == QSurfaceFormat::CoreProfile;
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}
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void QOpenGLTextureGlyphCache::createTextureData(int width, int height)
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{
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QOpenGLContext *ctx = const_cast<QOpenGLContext *>(QOpenGLContext::currentContext());
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if (ctx == 0) {
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qWarning("QOpenGLTextureGlyphCache::createTextureData: Called with no context");
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return;
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}
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// create in QImageTextureGlyphCache baseclass is meant to be called
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// only to create the initial image and does not preserve the content,
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// so we don't call when this function is called from resize.
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if (ctx->d_func()->workaround_brokenFBOReadBack && image().isNull())
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QImageTextureGlyphCache::createTextureData(width, height);
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// Make the lower glyph texture size 16 x 16.
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if (width < 16)
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width = 16;
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if (height < 16)
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height = 16;
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if (m_textureResource && !m_textureResource->m_texture) {
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delete m_textureResource;
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m_textureResource = 0;
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}
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if (!m_textureResource)
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m_textureResource = new QOpenGLGlyphTexture(ctx);
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QOpenGLFunctions *funcs = ctx->functions();
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funcs->glGenTextures(1, &m_textureResource->m_texture);
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funcs->glBindTexture(GL_TEXTURE_2D, m_textureResource->m_texture);
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m_textureResource->m_width = width;
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m_textureResource->m_height = height;
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if (m_format == QFontEngine::Format_A32 || m_format == QFontEngine::Format_ARGB) {
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QVarLengthArray<uchar> data(width * height * 4);
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for (int i = 0; i < data.size(); ++i)
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data[i] = 0;
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funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, &data[0]);
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} else {
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QVarLengthArray<uchar> data(width * height);
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for (int i = 0; i < data.size(); ++i)
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data[i] = 0;
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#if !defined(QT_OPENGL_ES_2)
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const GLint internalFormat = isCoreProfile() ? GL_R8 : GL_ALPHA;
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const GLenum format = isCoreProfile() ? GL_RED : GL_ALPHA;
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#else
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const GLint internalFormat = GL_ALPHA;
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const GLenum format = GL_ALPHA;
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#endif
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funcs->glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, width, height, 0, format, GL_UNSIGNED_BYTE, &data[0]);
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}
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funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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m_filterMode = Nearest;
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if (!m_buffer.isCreated()) {
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m_buffer.create();
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m_buffer.bind();
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static GLfloat buf[sizeof(m_vertexCoordinateArray) + sizeof(m_textureCoordinateArray)];
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memcpy(buf, m_vertexCoordinateArray, sizeof(m_vertexCoordinateArray));
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memcpy(buf + (sizeof(m_vertexCoordinateArray) / sizeof(GLfloat)),
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m_textureCoordinateArray,
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sizeof(m_textureCoordinateArray));
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m_buffer.allocate(buf, sizeof(buf));
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m_buffer.release();
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}
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if (!m_vao.isCreated())
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m_vao.create();
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}
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void QOpenGLTextureGlyphCache::setupVertexAttribs()
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{
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m_buffer.bind();
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m_blitProgram->setAttributeBuffer(int(QT_VERTEX_COORDS_ATTR), GL_FLOAT, 0, 2);
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m_blitProgram->setAttributeBuffer(int(QT_TEXTURE_COORDS_ATTR), GL_FLOAT, sizeof(m_vertexCoordinateArray), 2);
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m_blitProgram->enableAttributeArray(int(QT_VERTEX_COORDS_ATTR));
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m_blitProgram->enableAttributeArray(int(QT_TEXTURE_COORDS_ATTR));
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m_buffer.release();
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}
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void QOpenGLTextureGlyphCache::resizeTextureData(int width, int height)
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{
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QOpenGLContext *ctx = QOpenGLContext::currentContext();
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if (ctx == 0) {
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qWarning("QOpenGLTextureGlyphCache::resizeTextureData: Called with no context");
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return;
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}
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QOpenGLFunctions *funcs = ctx->functions();
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GLint oldFbo;
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funcs->glGetIntegerv(GL_FRAMEBUFFER_BINDING, &oldFbo);
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int oldWidth = m_textureResource->m_width;
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int oldHeight = m_textureResource->m_height;
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// Make the lower glyph texture size 16 x 16.
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if (width < 16)
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width = 16;
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if (height < 16)
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height = 16;
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GLuint oldTexture = m_textureResource->m_texture;
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createTextureData(width, height);
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if (ctx->d_func()->workaround_brokenFBOReadBack) {
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QImageTextureGlyphCache::resizeTextureData(width, height);
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Q_ASSERT(image().depth() == 8);
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funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, oldHeight, GL_ALPHA, GL_UNSIGNED_BYTE, image().constBits());
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funcs->glDeleteTextures(1, &oldTexture);
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return;
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}
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// ### the QTextureGlyphCache API needs to be reworked to allow
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// ### resizeTextureData to fail
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funcs->glBindFramebuffer(GL_FRAMEBUFFER, m_textureResource->m_fbo);
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GLuint tmp_texture;
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funcs->glGenTextures(1, &tmp_texture);
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funcs->glBindTexture(GL_TEXTURE_2D, tmp_texture);
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funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, oldWidth, oldHeight, 0,
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GL_RGBA, GL_UNSIGNED_BYTE, NULL);
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funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
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funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
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funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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m_filterMode = Nearest;
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funcs->glBindTexture(GL_TEXTURE_2D, 0);
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funcs->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
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GL_TEXTURE_2D, tmp_texture, 0);
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funcs->glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT);
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funcs->glBindTexture(GL_TEXTURE_2D, oldTexture);
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if (pex != 0)
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pex->transferMode(BrushDrawingMode);
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funcs->glDisable(GL_STENCIL_TEST);
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funcs->glDisable(GL_DEPTH_TEST);
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funcs->glDisable(GL_SCISSOR_TEST);
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funcs->glDisable(GL_BLEND);
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funcs->glViewport(0, 0, oldWidth, oldHeight);
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QOpenGLShaderProgram *blitProgram = 0;
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if (pex == 0) {
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if (m_blitProgram == 0) {
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m_blitProgram = new QOpenGLShaderProgram(ctx);
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const bool isCoreProfile = ctx->format().profile() == QSurfaceFormat::CoreProfile;
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{
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QString source;
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source.append(QLatin1String(isCoreProfile ? qopenglslMainWithTexCoordsVertexShader_core : qopenglslMainWithTexCoordsVertexShader));
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source.append(QLatin1String(isCoreProfile ? qopenglslUntransformedPositionVertexShader_core : qopenglslUntransformedPositionVertexShader));
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QOpenGLShader *vertexShader = new QOpenGLShader(QOpenGLShader::Vertex, m_blitProgram);
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vertexShader->compileSourceCode(source);
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m_blitProgram->addShader(vertexShader);
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}
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{
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QString source;
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source.append(QLatin1String(isCoreProfile ? qopenglslMainFragmentShader_core : qopenglslMainFragmentShader));
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source.append(QLatin1String(isCoreProfile ? qopenglslImageSrcFragmentShader_core : qopenglslImageSrcFragmentShader));
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QOpenGLShader *fragmentShader = new QOpenGLShader(QOpenGLShader::Fragment, m_blitProgram);
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fragmentShader->compileSourceCode(source);
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m_blitProgram->addShader(fragmentShader);
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}
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m_blitProgram->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR);
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m_blitProgram->bindAttributeLocation("textureCoordArray", QT_TEXTURE_COORDS_ATTR);
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m_blitProgram->link();
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if (m_vao.isCreated()) {
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m_vao.bind();
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setupVertexAttribs();
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}
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}
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if (m_vao.isCreated())
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m_vao.bind();
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else
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setupVertexAttribs();
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m_blitProgram->bind();
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blitProgram = m_blitProgram;
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} else {
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pex->setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, m_vertexCoordinateArray);
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pex->setVertexAttributePointer(QT_TEXTURE_COORDS_ATTR, m_textureCoordinateArray);
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pex->shaderManager->useBlitProgram();
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blitProgram = pex->shaderManager->blitProgram();
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}
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blitProgram->setUniformValue("imageTexture", QT_IMAGE_TEXTURE_UNIT);
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funcs->glDrawArrays(GL_TRIANGLE_FAN, 0, 4);
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funcs->glBindTexture(GL_TEXTURE_2D, m_textureResource->m_texture);
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funcs->glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, oldWidth, oldHeight);
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funcs->glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0,
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GL_RENDERBUFFER, 0);
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funcs->glDeleteTextures(1, &tmp_texture);
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funcs->glDeleteTextures(1, &oldTexture);
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funcs->glBindFramebuffer(GL_FRAMEBUFFER, (GLuint)oldFbo);
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if (pex != 0) {
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funcs->glViewport(0, 0, pex->width, pex->height);
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pex->updateClipScissorTest();
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} else {
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if (m_vao.isCreated()) {
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m_vao.release();
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} else {
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m_blitProgram->disableAttributeArray(int(QT_VERTEX_COORDS_ATTR));
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m_blitProgram->disableAttributeArray(int(QT_TEXTURE_COORDS_ATTR));
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}
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}
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}
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void QOpenGLTextureGlyphCache::fillTexture(const Coord &c, glyph_t glyph, QFixed subPixelPosition)
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{
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QOpenGLContext *ctx = QOpenGLContext::currentContext();
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if (ctx == 0) {
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qWarning("QOpenGLTextureGlyphCache::fillTexture: Called with no context");
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return;
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}
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QOpenGLFunctions *funcs = ctx->functions();
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if (ctx->d_func()->workaround_brokenFBOReadBack) {
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QImageTextureGlyphCache::fillTexture(c, glyph, subPixelPosition);
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funcs->glBindTexture(GL_TEXTURE_2D, m_textureResource->m_texture);
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const QImage &texture = image();
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const uchar *bits = texture.constBits();
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bits += c.y * texture.bytesPerLine() + c.x;
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for (int i=0; i<c.h; ++i) {
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funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y + i, c.w, 1, GL_ALPHA, GL_UNSIGNED_BYTE, bits);
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bits += texture.bytesPerLine();
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}
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return;
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}
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QImage mask = textureMapForGlyph(glyph, subPixelPosition);
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const int maskWidth = mask.width();
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const int maskHeight = mask.height();
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if (mask.format() == QImage::Format_Mono) {
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mask = mask.convertToFormat(QImage::Format_Indexed8);
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for (int y = 0; y < maskHeight; ++y) {
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uchar *src = (uchar *) mask.scanLine(y);
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for (int x = 0; x < maskWidth; ++x)
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src[x] = -src[x]; // convert 0 and 1 into 0 and 255
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}
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} else if (mask.depth() == 32) {
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if (mask.format() == QImage::Format_RGB32
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// We need to make the alpha component equal to the average of the RGB values.
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// This is needed when drawing sub-pixel antialiased text on translucent targets.
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#if Q_BYTE_ORDER == Q_BIG_ENDIAN
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|| mask.format() == QImage::Format_ARGB32_Premultiplied
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#else
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|| (mask.format() == QImage::Format_ARGB32_Premultiplied
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&& ctx->isOpenGLES())
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#endif
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) {
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for (int y = 0; y < maskHeight; ++y) {
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QRgb *src = (QRgb *) mask.scanLine(y);
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for (int x = 0; x < maskWidth; ++x) {
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int r = qRed(src[x]);
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int g = qGreen(src[x]);
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int b = qBlue(src[x]);
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int avg;
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if (mask.format() == QImage::Format_RGB32)
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avg = (r + g + b + 1) / 3; // "+1" for rounding.
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else // Format_ARGB_Premultiplied
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avg = qAlpha(src[x]);
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src[x] = qRgba(r, g, b, avg);
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// swizzle the bits to accommodate for the GL_RGBA upload.
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#if Q_BYTE_ORDER != Q_BIG_ENDIAN
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if (ctx->isOpenGLES())
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#endif
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src[x] = ARGB2RGBA(src[x]);
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}
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}
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}
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}
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funcs->glBindTexture(GL_TEXTURE_2D, m_textureResource->m_texture);
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if (mask.depth() == 32) {
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#ifdef QT_OPENGL_ES_2
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GLenum fmt = GL_RGBA;
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#else
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GLenum fmt = ctx->isOpenGLES() ? GL_RGBA : GL_BGRA;
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#endif // QT_OPENGL_ES_2
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#if Q_BYTE_ORDER == Q_BIG_ENDIAN
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fmt = GL_RGBA;
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#endif
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funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, fmt, GL_UNSIGNED_BYTE, mask.bits());
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} else {
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// The scanlines in mask are 32-bit aligned, even for mono or 8-bit formats. This
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// is good because it matches the default of 4 bytes for GL_UNPACK_ALIGNMENT.
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#if !defined(QT_OPENGL_ES_2)
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const GLenum format = isCoreProfile() ? GL_RED : GL_ALPHA;
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#else
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const GLenum format = GL_ALPHA;
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#endif
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funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, format, GL_UNSIGNED_BYTE, mask.bits());
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}
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}
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int QOpenGLTextureGlyphCache::glyphPadding() const
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{
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return 1;
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}
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int QOpenGLTextureGlyphCache::maxTextureWidth() const
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{
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QOpenGLContext *ctx = const_cast<QOpenGLContext *>(QOpenGLContext::currentContext());
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if (ctx == 0)
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return QImageTextureGlyphCache::maxTextureWidth();
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else
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return ctx->d_func()->maxTextureSize();
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}
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int QOpenGLTextureGlyphCache::maxTextureHeight() const
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{
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QOpenGLContext *ctx = const_cast<QOpenGLContext *>(QOpenGLContext::currentContext());
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if (ctx == 0)
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return QImageTextureGlyphCache::maxTextureHeight();
|
|
|
|
if (ctx->d_func()->workaround_brokenTexSubImage)
|
|
return qMin(1024, ctx->d_func()->maxTextureSize());
|
|
else
|
|
return ctx->d_func()->maxTextureSize();
|
|
}
|
|
|
|
void QOpenGLTextureGlyphCache::clear()
|
|
{
|
|
if (m_textureResource)
|
|
m_textureResource->free();
|
|
m_textureResource = 0;
|
|
|
|
m_w = 0;
|
|
m_h = 0;
|
|
m_cx = 0;
|
|
m_cy = 0;
|
|
m_currentRowHeight = 0;
|
|
coords.clear();
|
|
}
|
|
|
|
QT_END_NAMESPACE
|