diff options
Diffstat (limited to 'src/opengl/qopengltextureglyphcache.cpp')
| -rw-r--r-- | src/opengl/qopengltextureglyphcache.cpp | 485 |
1 files changed, 485 insertions, 0 deletions
diff --git a/src/opengl/qopengltextureglyphcache.cpp b/src/opengl/qopengltextureglyphcache.cpp new file mode 100644 index 0000000000..66fd3a7507 --- /dev/null +++ b/src/opengl/qopengltextureglyphcache.cpp @@ -0,0 +1,485 @@ +/**************************************************************************** +** +** 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 "qopengltextureglyphcache_p.h" +#include <private/qopenglpaintengine_p.h> +#include "private/qopenglengineshadersource_p.h" +#include <private/qopenglextensions_p.h> +#include <qrgb.h> +#include <private/qdrawhelper_p.h> + +QT_BEGIN_NAMESPACE + + +static int next_qopengltextureglyphcache_serial_number() +{ + static QBasicAtomicInt serial = Q_BASIC_ATOMIC_INITIALIZER(0); + return 1 + serial.fetchAndAddRelaxed(1); +} + +QOpenGLTextureGlyphCache::QOpenGLTextureGlyphCache(QFontEngine::GlyphFormat format, const QTransform &matrix, const QColor &color) + : QImageTextureGlyphCache(format, matrix, color) + , m_textureResource(nullptr) + , pex(nullptr) + , m_blitProgram(nullptr) + , m_filterMode(Nearest) + , m_serialNumber(next_qopengltextureglyphcache_serial_number()) + , 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; + 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(); +} + +#if !defined(QT_OPENGL_ES_2) +static inline bool isCoreProfile() +{ + return QOpenGLContext::currentContext()->format().profile() == QSurfaceFormat::CoreProfile; +} +#endif + +void QOpenGLTextureGlyphCache::createTextureData(int width, int height) +{ + QOpenGLContext *ctx = const_cast<QOpenGLContext *>(QOpenGLContext::currentContext()); + if (ctx == nullptr) { + 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 = nullptr; + } + + 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 + 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(); +} + +static void load_glyph_image_to_texture(QOpenGLContext *ctx, + QImage &img, + GLuint texture, + int tx, int ty) +{ + QOpenGLFunctions *funcs = ctx->functions(); + + const int imgWidth = img.width(); + const int imgHeight = img.height(); + + if (img.format() == QImage::Format_Mono) { + img = img.convertToFormat(QImage::Format_Grayscale8); + } else if (img.depth() == 32) { + if (img.format() == QImage::Format_RGB32 + // We need to make the alpha component equal to the average of the RGB values. + // This is needed when drawing sub-pixel antialiased text on translucent targets. +#if Q_BYTE_ORDER == Q_BIG_ENDIAN + || img.format() == QImage::Format_ARGB32_Premultiplied +#else + || (img.format() == QImage::Format_ARGB32_Premultiplied + && ctx->isOpenGLES()) +#endif + ) { + for (int y = 0; y < imgHeight; ++y) { + QRgb *src = (QRgb *) img.scanLine(y); + for (int x = 0; x < imgWidth; ++x) { + int r = qRed(src[x]); + int g = qGreen(src[x]); + int b = qBlue(src[x]); + int avg; + if (img.format() == QImage::Format_RGB32) + avg = (r + g + b + 1) / 3; // "+1" for rounding. + else // Format_ARGB_Premultiplied + avg = qAlpha(src[x]); + + src[x] = qRgba(r, g, b, avg); + // swizzle the bits to accommodate for the GL_RGBA upload. +#if Q_BYTE_ORDER != Q_BIG_ENDIAN + if (ctx->isOpenGLES()) +#endif + src[x] = ARGB2RGBA(src[x]); + } + } + } + } + + funcs->glBindTexture(GL_TEXTURE_2D, texture); + if (img.depth() == 32) { +#ifdef QT_OPENGL_ES_2 + GLenum fmt = GL_RGBA; +#else + GLenum fmt = ctx->isOpenGLES() ? GL_RGBA : GL_BGRA; +#endif // QT_OPENGL_ES_2 + +#if Q_BYTE_ORDER == Q_BIG_ENDIAN + fmt = GL_RGBA; +#endif + funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, tx, ty, imgWidth, imgHeight, fmt, GL_UNSIGNED_BYTE, img.constBits()); + } else { + // The scanlines in image are 32-bit aligned, even for mono or 8-bit formats. This + // is good because it matches the default of 4 bytes for GL_UNPACK_ALIGNMENT. +#if !defined(QT_OPENGL_ES_2) + const GLenum format = isCoreProfile() ? GL_RED : GL_ALPHA; +#else + const GLenum format = GL_ALPHA; +#endif + funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, tx, ty, imgWidth, imgHeight, format, GL_UNSIGNED_BYTE, img.constBits()); + } +} + +static void load_glyph_image_region_to_texture(QOpenGLContext *ctx, + const QImage &srcImg, + int x, int y, + int w, int h, + GLuint texture, + int tx, int ty) +{ + Q_ASSERT(x + w <= srcImg.width() && y + h <= srcImg.height()); + + QImage img; + if (x != 0 || y != 0 || w != srcImg.width() || h != srcImg.height()) + img = srcImg.copy(x, y, w, h); + else + img = srcImg; + + load_glyph_image_to_texture(ctx, img, texture, tx, ty); +} + +void QOpenGLTextureGlyphCache::resizeTextureData(int width, int height) +{ + QOpenGLContext *ctx = QOpenGLContext::currentContext(); + if (ctx == nullptr) { + 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); + load_glyph_image_region_to_texture(ctx, image(), 0, 0, qMin(oldWidth, width), qMin(oldHeight, height), + m_textureResource->m_texture, 0, 0); + return; + } + + // ### the QTextureGlyphCache API needs to be reworked to allow + // ### resizeTextureData to fail + + funcs->glBindFramebuffer(GL_FRAMEBUFFER, m_textureResource->m_fbo); + + GLuint tmp_texture; + funcs->glGenTextures(1, &tmp_texture); + funcs->glBindTexture(GL_TEXTURE_2D, tmp_texture); + funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, oldWidth, oldHeight, 0, + GL_RGBA, GL_UNSIGNED_BYTE, nullptr); + funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_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; + funcs->glBindTexture(GL_TEXTURE_2D, 0); + funcs->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, + GL_TEXTURE_2D, tmp_texture, 0); + + funcs->glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT); + funcs->glBindTexture(GL_TEXTURE_2D, oldTexture); + + if (pex != nullptr) + pex->transferMode(BrushDrawingMode); + + funcs->glDisable(GL_STENCIL_TEST); + funcs->glDisable(GL_DEPTH_TEST); + funcs->glDisable(GL_SCISSOR_TEST); + funcs->glDisable(GL_BLEND); + + funcs->glViewport(0, 0, oldWidth, oldHeight); + + QOpenGLShaderProgram *blitProgram = nullptr; + if (pex == nullptr) { + if (m_blitProgram == nullptr) { + m_blitProgram = new QOpenGLShaderProgram; + const bool isCoreProfile = ctx->format().profile() == QSurfaceFormat::CoreProfile; + + { + QString source; +#ifdef Q_OS_WASM + source.append(QLatin1String(isCoreProfile ? qopenglslUntransformedPositionVertexShader_core : qopenglslUntransformedPositionVertexShader)); + source.append(QLatin1String(isCoreProfile ? qopenglslMainWithTexCoordsVertexShader_core : qopenglslMainWithTexCoordsVertexShader)); +#else + source.append(QLatin1String(isCoreProfile ? qopenglslMainWithTexCoordsVertexShader_core : qopenglslMainWithTexCoordsVertexShader)); + source.append(QLatin1String(isCoreProfile ? qopenglslUntransformedPositionVertexShader_core : qopenglslUntransformedPositionVertexShader)); +#endif + m_blitProgram->addCacheableShaderFromSourceCode(QOpenGLShader::Vertex, source); + } + + { + QString source; +#ifdef Q_OS_WASM + source.append(QLatin1String(isCoreProfile ? qopenglslImageSrcFragmentShader_core : qopenglslImageSrcFragmentShader)); + source.append(QLatin1String(isCoreProfile ? qopenglslMainFragmentShader_core : qopenglslMainFragmentShader)); +#else + source.append(QLatin1String(isCoreProfile ? qopenglslMainFragmentShader_core : qopenglslMainFragmentShader)); + source.append(QLatin1String(isCoreProfile ? qopenglslImageSrcFragmentShader_core : qopenglslImageSrcFragmentShader)); +#endif + m_blitProgram->addCacheableShaderFromSourceCode(QOpenGLShader::Fragment, source); + } + + m_blitProgram->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR); + m_blitProgram->bindAttributeLocation("textureCoordArray", QT_TEXTURE_COORDS_ATTR); + + m_blitProgram->link(); + + if (m_vao.isCreated()) { + m_vao.bind(); + setupVertexAttribs(); + } + } + + if (m_vao.isCreated()) + m_vao.bind(); + else + setupVertexAttribs(); + + m_blitProgram->bind(); + blitProgram = m_blitProgram; + + } else { + pex->uploadData(QT_VERTEX_COORDS_ATTR, m_vertexCoordinateArray, 8); + pex->uploadData(QT_TEXTURE_COORDS_ATTR, m_textureCoordinateArray, 8); + + pex->shaderManager->useBlitProgram(); + blitProgram = pex->shaderManager->blitProgram(); + } + + blitProgram->setUniformValue("imageTexture", QT_IMAGE_TEXTURE_UNIT); + + funcs->glDrawArrays(GL_TRIANGLE_FAN, 0, 4); + + funcs->glBindTexture(GL_TEXTURE_2D, m_textureResource->m_texture); + + funcs->glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, oldWidth, oldHeight); + + funcs->glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, + GL_RENDERBUFFER, 0); + funcs->glDeleteTextures(1, &tmp_texture); + funcs->glDeleteTextures(1, &oldTexture); + + funcs->glBindFramebuffer(GL_FRAMEBUFFER, (GLuint)oldFbo); + + if (pex != nullptr) { + funcs->glViewport(0, 0, pex->width, pex->height); + pex->updateClipScissorTest(); + } else { + if (m_vao.isCreated()) { + m_vao.release(); + } else { + m_blitProgram->disableAttributeArray(int(QT_VERTEX_COORDS_ATTR)); + m_blitProgram->disableAttributeArray(int(QT_TEXTURE_COORDS_ATTR)); + } + } +} + +void QOpenGLTextureGlyphCache::fillTexture(const Coord &c, glyph_t glyph, QFixed subPixelPosition) +{ + QOpenGLContext *ctx = QOpenGLContext::currentContext(); + if (ctx == nullptr) { + qWarning("QOpenGLTextureGlyphCache::fillTexture: Called with no context"); + return; + } + + if (ctx->d_func()->workaround_brokenFBOReadBack) { + QImageTextureGlyphCache::fillTexture(c, glyph, subPixelPosition); + load_glyph_image_region_to_texture(ctx, image(), c.x, c.y, c.w, c.h, m_textureResource->m_texture, c.x, c.y); + return; + } + + QImage mask = textureMapForGlyph(glyph, subPixelPosition); + load_glyph_image_to_texture(ctx, mask, m_textureResource->m_texture, c.x, c.y); +} + +int QOpenGLTextureGlyphCache::glyphPadding() const +{ + return 1; +} + +int QOpenGLTextureGlyphCache::maxTextureWidth() const +{ + QOpenGLContext *ctx = const_cast<QOpenGLContext *>(QOpenGLContext::currentContext()); + if (ctx == nullptr) + return QImageTextureGlyphCache::maxTextureWidth(); + else + return ctx->d_func()->maxTextureSize(); +} + +int QOpenGLTextureGlyphCache::maxTextureHeight() const +{ + QOpenGLContext *ctx = const_cast<QOpenGLContext *>(QOpenGLContext::currentContext()); + if (ctx == nullptr) + 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 = nullptr; + + delete m_blitProgram; + m_blitProgram = nullptr; + + m_w = 0; + m_h = 0; + m_cx = 0; + m_cy = 0; + m_currentRowHeight = 0; + coords.clear(); +} + +QT_END_NAMESPACE |