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Friedemann Kleint authored
Change-Id: I528b7c4c22a1c47f54fe1b78a9d781a6af9cfc6b Reviewed-by:Allan Sandfeld Jensen <allan.jensen@theqtcompany.com>
35216895
/******************************************************************************** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).** Contact: http://www.qt-project.org/legal**** This file is part of the QtGui module of the Qt Toolkit.**** $QT_BEGIN_LICENSE:LGPL21$** 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 Digia. For licensing terms and** conditions see http://qt.digia.com/licensing. For further information** use the contact form at http://qt.digia.com/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 2.1 or version 3 as published by the Free** Software Foundation and appearing in the file LICENSE.LGPLv21 and** LICENSE.LGPLv3 included in the packaging of this file. Please review the** following information to ensure the GNU Lesser General Public License** requirements will be met: https://www.gnu.org/licenses/lgpl.html and** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.**** In addition, as a special exception, Digia gives you certain additional** rights. These rights are described in the Digia Qt LGPL Exception** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.**** $QT_END_LICENSE$******************************************************************************/#include "qopengltextureglyphcache_p.h"#include "qopenglpaintengine_p.h"#include "private/qopenglengineshadersource_p.h"#include "qopenglextensions_p.h"#include <qrgb.h>#include <private/qdrawhelper_p.h>QT_BEGIN_NAMESPACEQBasicAtomicInt qopengltextureglyphcache_serial_number = Q_BASIC_ATOMIC_INITIALIZER(1);QOpenGLTextureGlyphCache::QOpenGLTextureGlyphCache(QFontEngine::GlyphFormat format, const QTransform &matrix) : QImageTextureGlyphCache(format, matrix) , m_textureResource(0) , pex(0) , m_blitProgram(0) , m_filterMode(Nearest) , m_serialNumber(qopengltextureglyphcache_serial_number.fetchAndAddRelaxed(1)) , m_buffer(QOpenGLBuffer::VertexBuffer){#ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG qDebug(" -> QOpenGLTextureGlyphCache() %p for context %p.", this, QOpenGLContext::currentContext());#endif m_vertexCoordinateArray[0] = -1.0f; m_vertexCoordinateArray[1] = -1.0f; m_vertexCoordinateArray[2] = 1.0f; m_vertexCoordinateArray[3] = -1.0f; m_vertexCoordinateArray[4] = 1.0f; m_vertexCoordinateArray[5] = 1.0f; m_vertexCoordinateArray[6] = -1.0f; m_vertexCoordinateArray[7] = 1.0f; m_textureCoordinateArray[0] = 0.0f; m_textureCoordinateArray[1] = 0.0f; m_textureCoordinateArray[2] = 1.0f; m_textureCoordinateArray[3] = 0.0f;7172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129130131132133134135136137138139140
m_textureCoordinateArray[4] = 1.0f;
m_textureCoordinateArray[5] = 1.0f;
m_textureCoordinateArray[6] = 0.0f;
m_textureCoordinateArray[7] = 1.0f;
}
QOpenGLTextureGlyphCache::~QOpenGLTextureGlyphCache()
{
#ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG
qDebug(" -> ~QOpenGLTextureGlyphCache() %p.", this);
#endif
clear();
}
static inline bool isCoreProfile()
{
return QOpenGLContext::currentContext()->format().profile() == QSurfaceFormat::CoreProfile;
}
void QOpenGLTextureGlyphCache::createTextureData(int width, int height)
{
QOpenGLContext *ctx = const_cast<QOpenGLContext *>(QOpenGLContext::currentContext());
if (ctx == 0) {
qWarning("QOpenGLTextureGlyphCache::createTextureData: Called with no context");
return;
}
// create in QImageTextureGlyphCache baseclass is meant to be called
// only to create the initial image and does not preserve the content,
// so we don't call when this function is called from resize.
if (ctx->d_func()->workaround_brokenFBOReadBack && image().isNull())
QImageTextureGlyphCache::createTextureData(width, height);
// Make the lower glyph texture size 16 x 16.
if (width < 16)
width = 16;
if (height < 16)
height = 16;
if (m_textureResource && !m_textureResource->m_texture) {
delete m_textureResource;
m_textureResource = 0;
}
if (!m_textureResource)
m_textureResource = new QOpenGLGlyphTexture(ctx);
QOpenGLFunctions *funcs = ctx->functions();
funcs->glGenTextures(1, &m_textureResource->m_texture);
funcs->glBindTexture(GL_TEXTURE_2D, m_textureResource->m_texture);
m_textureResource->m_width = width;
m_textureResource->m_height = height;
if (m_format == QFontEngine::Format_A32 || m_format == QFontEngine::Format_ARGB) {
QVarLengthArray<uchar> data(width * height * 4);
for (int i = 0; i < data.size(); ++i)
data[i] = 0;
funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, &data[0]);
} else {
QVarLengthArray<uchar> data(width * height);
for (int i = 0; i < data.size(); ++i)
data[i] = 0;
#if !defined(QT_OPENGL_ES_2)
const GLint internalFormat = isCoreProfile() ? GL_R8 : GL_ALPHA;
const GLenum format = isCoreProfile() ? GL_RED : GL_ALPHA;
#else
const GLint internalFormat = GL_ALPHA;
const GLenum format = GL_ALPHA;
#endif
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funcs->glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, width, height, 0, format, GL_UNSIGNED_BYTE, &data[0]);
}
funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
m_filterMode = Nearest;
if (!m_buffer.isCreated()) {
m_buffer.create();
m_buffer.bind();
static GLfloat buf[sizeof(m_vertexCoordinateArray) + sizeof(m_textureCoordinateArray)];
memcpy(buf, m_vertexCoordinateArray, sizeof(m_vertexCoordinateArray));
memcpy(buf + (sizeof(m_vertexCoordinateArray) / sizeof(GLfloat)),
m_textureCoordinateArray,
sizeof(m_textureCoordinateArray));
m_buffer.allocate(buf, sizeof(buf));
m_buffer.release();
}
if (!m_vao.isCreated())
m_vao.create();
}
void QOpenGLTextureGlyphCache::setupVertexAttribs()
{
m_buffer.bind();
m_blitProgram->setAttributeBuffer(int(QT_VERTEX_COORDS_ATTR), GL_FLOAT, 0, 2);
m_blitProgram->setAttributeBuffer(int(QT_TEXTURE_COORDS_ATTR), GL_FLOAT, sizeof(m_vertexCoordinateArray), 2);
m_blitProgram->enableAttributeArray(int(QT_VERTEX_COORDS_ATTR));
m_blitProgram->enableAttributeArray(int(QT_TEXTURE_COORDS_ATTR));
m_buffer.release();
}
void QOpenGLTextureGlyphCache::resizeTextureData(int width, int height)
{
QOpenGLContext *ctx = QOpenGLContext::currentContext();
if (ctx == 0) {
qWarning("QOpenGLTextureGlyphCache::resizeTextureData: Called with no context");
return;
}
QOpenGLFunctions *funcs = ctx->functions();
GLint oldFbo;
funcs->glGetIntegerv(GL_FRAMEBUFFER_BINDING, &oldFbo);
int oldWidth = m_textureResource->m_width;
int oldHeight = m_textureResource->m_height;
// Make the lower glyph texture size 16 x 16.
if (width < 16)
width = 16;
if (height < 16)
height = 16;
GLuint oldTexture = m_textureResource->m_texture;
createTextureData(width, height);
if (ctx->d_func()->workaround_brokenFBOReadBack) {
QImageTextureGlyphCache::resizeTextureData(width, height);
Q_ASSERT(image().depth() == 8);
funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, width, oldHeight, GL_ALPHA, GL_UNSIGNED_BYTE, image().constBits());
funcs->glDeleteTextures(1, &oldTexture);
return;
}
// ### the QTextureGlyphCache API needs to be reworked to allow
// ### resizeTextureData to fail