| /**************************************************************************** |
| ** |
| ** Copyright (C) 2018 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtQuick module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
| ** Commercial License Usage |
| ** Licensees holding valid commercial Qt licenses may use this file in |
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| ** 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 |
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| ** |
| ** 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 |
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| ** information to ensure the GNU General Public License requirements will |
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| ** $QT_END_LICENSE$ |
| ** |
| ****************************************************************************/ |
| |
| #include "qsgopengldistancefieldglyphcache_p.h" |
| |
| #include <QtCore/qelapsedtimer.h> |
| #include <QtCore/qbuffer.h> |
| #include <QtCore/qendian.h> |
| #include <QtQml/qqmlfile.h> |
| |
| #include <QtGui/private/qdistancefield_p.h> |
| #include <QtGui/private/qopenglcontext_p.h> |
| #include <QtQml/private/qqmlglobal_p.h> |
| #include <qopenglfunctions.h> |
| #include <qopenglframebufferobject.h> |
| #include <qmath.h> |
| #include "qsgcontext_p.h" |
| |
| |
| #if !defined(QT_OPENGL_ES_2) |
| #include <QtGui/qopenglfunctions_3_2_core.h> |
| #endif |
| |
| QT_BEGIN_NAMESPACE |
| |
| DEFINE_BOOL_CONFIG_OPTION(qmlUseGlyphCacheWorkaround, QML_USE_GLYPHCACHE_WORKAROUND) |
| DEFINE_BOOL_CONFIG_OPTION(qsgPreferFullSizeGlyphCacheTextures, QSG_PREFER_FULLSIZE_GLYPHCACHE_TEXTURES) |
| |
| #if !defined(QSG_OPENGL_DISTANCEFIELD_GLYPH_CACHE_PADDING) |
| # define QSG_OPENGL_DISTANCEFIELD_GLYPH_CACHE_PADDING 2 |
| #endif |
| |
| QSGOpenGLDistanceFieldGlyphCache::QSGOpenGLDistanceFieldGlyphCache(QOpenGLContext *c, |
| const QRawFont &font) |
| : QSGDistanceFieldGlyphCache(font) |
| , m_maxTextureWidth(0) |
| , m_maxTextureHeight(0) |
| , m_maxTextureCount(3) |
| , m_areaAllocator(nullptr) |
| , m_blitProgram(nullptr) |
| , m_blitBuffer(QOpenGLBuffer::VertexBuffer) |
| , m_fboGuard(nullptr) |
| , m_funcs(c->functions()) |
| #if !defined(QT_OPENGL_ES_2) |
| , m_coreFuncs(nullptr) |
| #endif |
| { |
| if (Q_LIKELY(m_blitBuffer.create())) { |
| m_blitBuffer.bind(); |
| static const GLfloat buffer[16] = {-1.0f, -1.0f, 1.0f, -1.0f, 1.0f, 1.0f, -1.0f, 1.0f, |
| 0.0f, 0.0f, 1.0f, 0.0f, 1.0f, 1.0f, 0.0f, 1.0f}; |
| m_blitBuffer.allocate(buffer, sizeof(buffer)); |
| m_blitBuffer.release(); |
| } else { |
| qWarning("Buffer creation failed"); |
| } |
| |
| m_coreProfile = (c->format().profile() == QSurfaceFormat::CoreProfile); |
| |
| // Load a pregenerated cache if the font contains one |
| loadPregeneratedCache(font); |
| } |
| |
| QSGOpenGLDistanceFieldGlyphCache::~QSGOpenGLDistanceFieldGlyphCache() |
| { |
| for (int i = 0; i < m_textures.count(); ++i) |
| m_funcs->glDeleteTextures(1, &m_textures[i].texture); |
| |
| if (m_fboGuard != nullptr) |
| m_fboGuard->free(); |
| |
| delete m_blitProgram; |
| delete m_areaAllocator; |
| } |
| |
| void QSGOpenGLDistanceFieldGlyphCache::requestGlyphs(const QSet<glyph_t> &glyphs) |
| { |
| QList<GlyphPosition> glyphPositions; |
| QVector<glyph_t> glyphsToRender; |
| |
| const int padding = QSG_OPENGL_DISTANCEFIELD_GLYPH_CACHE_PADDING; |
| const qreal scaleFactor = qreal(1) / QT_DISTANCEFIELD_SCALE(m_doubleGlyphResolution); |
| |
| if (m_maxTextureHeight == 0) { |
| m_funcs->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &m_maxTextureWidth); |
| |
| // We need to add a buffer to avoid glyphs that overlap the border between two |
| // textures causing the height of the textures to extend beyond the limit. |
| m_maxTextureHeight = m_maxTextureWidth - (qCeil(m_referenceFont.pixelSize() * scaleFactor) + distanceFieldRadius() * 2 + padding * 2); |
| } |
| |
| if (m_areaAllocator == nullptr) |
| m_areaAllocator = new QSGAreaAllocator(QSize(m_maxTextureWidth, m_maxTextureCount * m_maxTextureHeight)); |
| |
| for (QSet<glyph_t>::const_iterator it = glyphs.constBegin(); it != glyphs.constEnd() ; ++it) { |
| glyph_t glyphIndex = *it; |
| |
| QRectF boundingRect = glyphData(glyphIndex).boundingRect; |
| int glyphWidth = qCeil(boundingRect.width()) + distanceFieldRadius() * 2; |
| int glyphHeight = qCeil(boundingRect.height()) + distanceFieldRadius() * 2; |
| QSize glyphSize(glyphWidth + padding * 2, glyphHeight + padding * 2); |
| QRect alloc = m_areaAllocator->allocate(glyphSize); |
| |
| if (alloc.isNull()) { |
| // Unallocate unused glyphs until we can allocated the new glyph |
| while (alloc.isNull() && !m_unusedGlyphs.isEmpty()) { |
| glyph_t unusedGlyph = *m_unusedGlyphs.constBegin(); |
| |
| TexCoord unusedCoord = glyphTexCoord(unusedGlyph); |
| QRectF unusedGlyphBoundingRect = glyphData(unusedGlyph).boundingRect; |
| int unusedGlyphWidth = qCeil(unusedGlyphBoundingRect.width()) + distanceFieldRadius() * 2; |
| int unusedGlyphHeight = qCeil(unusedGlyphBoundingRect.height()) + distanceFieldRadius() * 2; |
| m_areaAllocator->deallocate(QRect(unusedCoord.x - padding, |
| unusedCoord.y - padding, |
| padding * 2 + unusedGlyphWidth, |
| padding * 2 + unusedGlyphHeight)); |
| |
| m_unusedGlyphs.remove(unusedGlyph); |
| m_glyphsTexture.remove(unusedGlyph); |
| removeGlyph(unusedGlyph); |
| |
| alloc = m_areaAllocator->allocate(glyphSize); |
| } |
| |
| // Not enough space left for this glyph... skip to the next one |
| if (alloc.isNull()) |
| continue; |
| } |
| |
| TextureInfo *tex = textureInfo(alloc.y() / m_maxTextureHeight); |
| alloc = QRect(alloc.x(), alloc.y() % m_maxTextureHeight, alloc.width(), alloc.height()); |
| |
| tex->allocatedArea |= alloc; |
| Q_ASSERT(tex->padding == padding || tex->padding < 0); |
| tex->padding = padding; |
| |
| GlyphPosition p; |
| p.glyph = glyphIndex; |
| p.position = alloc.topLeft() + QPoint(padding, padding); |
| |
| glyphPositions.append(p); |
| glyphsToRender.append(glyphIndex); |
| m_glyphsTexture.insert(glyphIndex, tex); |
| } |
| |
| setGlyphsPosition(glyphPositions); |
| markGlyphsToRender(glyphsToRender); |
| } |
| |
| void QSGOpenGLDistanceFieldGlyphCache::storeGlyphs(const QList<QDistanceField> &glyphs) |
| { |
| typedef QHash<TextureInfo *, QVector<glyph_t> > GlyphTextureHash; |
| typedef GlyphTextureHash::const_iterator GlyphTextureHashConstIt; |
| |
| GlyphTextureHash glyphTextures; |
| |
| GLint alignment = 4; // default value |
| m_funcs->glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment); |
| |
| // Distance field data is always tightly packed |
| m_funcs->glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
| |
| for (int i = 0; i < glyphs.size(); ++i) { |
| QDistanceField glyph = glyphs.at(i); |
| glyph_t glyphIndex = glyph.glyph(); |
| TexCoord c = glyphTexCoord(glyphIndex); |
| TextureInfo *texInfo = m_glyphsTexture.value(glyphIndex); |
| |
| resizeTexture(texInfo, texInfo->allocatedArea.width(), texInfo->allocatedArea.height()); |
| m_funcs->glBindTexture(GL_TEXTURE_2D, texInfo->texture); |
| |
| glyphTextures[texInfo].append(glyphIndex); |
| |
| int padding = texInfo->padding; |
| int expectedWidth = qCeil(c.width + c.xMargin * 2); |
| glyph = glyph.copy(-padding, -padding, |
| expectedWidth + padding * 2, glyph.height() + padding * 2); |
| |
| if (useTextureResizeWorkaround()) { |
| uchar *inBits = glyph.scanLine(0); |
| uchar *outBits = texInfo->image.scanLine(int(c.y) - padding) + int(c.x) - padding; |
| for (int y = 0; y < glyph.height(); ++y) { |
| memcpy(outBits, inBits, glyph.width()); |
| inBits += glyph.width(); |
| outBits += texInfo->image.width(); |
| } |
| } |
| |
| #if !defined(QT_OPENGL_ES_2) |
| const GLenum format = isCoreProfile() ? GL_RED : GL_ALPHA; |
| #else |
| const GLenum format = GL_ALPHA; |
| #endif |
| if (useTextureUploadWorkaround()) { |
| for (int i = 0; i < glyph.height(); ++i) { |
| m_funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, |
| c.x - padding, c.y + i - padding, glyph.width(),1, |
| format, GL_UNSIGNED_BYTE, |
| glyph.scanLine(i)); |
| } |
| } else { |
| m_funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, |
| c.x - padding, c.y - padding, glyph.width(), glyph.height(), |
| format, GL_UNSIGNED_BYTE, |
| glyph.constBits()); |
| } |
| } |
| |
| // restore to previous alignment |
| m_funcs->glPixelStorei(GL_UNPACK_ALIGNMENT, alignment); |
| |
| for (GlyphTextureHashConstIt i = glyphTextures.constBegin(), cend = glyphTextures.constEnd(); i != cend; ++i) { |
| Texture t; |
| t.textureId = i.key()->texture; |
| t.size = i.key()->size; |
| t.rhiBased = false; |
| setGlyphsTexture(i.value(), t); |
| } |
| } |
| |
| void QSGOpenGLDistanceFieldGlyphCache::referenceGlyphs(const QSet<glyph_t> &glyphs) |
| { |
| m_unusedGlyphs -= glyphs; |
| } |
| |
| void QSGOpenGLDistanceFieldGlyphCache::releaseGlyphs(const QSet<glyph_t> &glyphs) |
| { |
| m_unusedGlyphs += glyphs; |
| } |
| |
| void QSGOpenGLDistanceFieldGlyphCache::createTexture(TextureInfo *texInfo, |
| int width, |
| int height) |
| { |
| QByteArray zeroBuf(width * height, 0); |
| createTexture(texInfo, width, height, zeroBuf.constData()); |
| } |
| |
| void QSGOpenGLDistanceFieldGlyphCache::createTexture(TextureInfo *texInfo, |
| int width, |
| int height, |
| const void *pixels) |
| { |
| if (useTextureResizeWorkaround() && texInfo->image.isNull()) { |
| texInfo->image = QDistanceField(width, height); |
| memcpy(texInfo->image.bits(), pixels, width * height); |
| } |
| |
| while (m_funcs->glGetError() != GL_NO_ERROR) { } |
| |
| m_funcs->glGenTextures(1, &texInfo->texture); |
| m_funcs->glBindTexture(GL_TEXTURE_2D, texInfo->texture); |
| |
| m_funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| m_funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| m_funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); |
| m_funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); |
| #if !defined(QT_OPENGL_ES_2) |
| if (!QOpenGLContext::currentContext()->isOpenGLES()) |
| m_funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0); |
| 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 |
| |
| m_funcs->glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, width, height, 0, format, GL_UNSIGNED_BYTE, pixels); |
| |
| texInfo->size = QSize(width, height); |
| |
| GLuint error = m_funcs->glGetError(); |
| if (error != GL_NO_ERROR) { |
| m_funcs->glBindTexture(GL_TEXTURE_2D, 0); |
| m_funcs->glDeleteTextures(1, &texInfo->texture); |
| texInfo->texture = 0; |
| } |
| |
| } |
| |
| static void freeFramebufferFunc(QOpenGLFunctions *funcs, GLuint id) |
| { |
| funcs->glDeleteFramebuffers(1, &id); |
| } |
| |
| void QSGOpenGLDistanceFieldGlyphCache::resizeTexture(TextureInfo *texInfo, int width, int height) |
| { |
| QOpenGLContext *ctx = QOpenGLContext::currentContext(); |
| Q_ASSERT(ctx); |
| |
| int oldWidth = texInfo->size.width(); |
| int oldHeight = texInfo->size.height(); |
| if (width == oldWidth && height == oldHeight) |
| return; |
| |
| GLuint oldTexture = texInfo->texture; |
| createTexture(texInfo, width, height); |
| |
| if (!oldTexture) |
| return; |
| |
| updateTexture(oldTexture, texInfo->texture, texInfo->size); |
| |
| #if !defined(QT_OPENGL_ES_2) |
| if (isCoreProfile() && !useTextureResizeWorkaround()) { |
| // For an OpenGL Core Profile we can use http://www.opengl.org/wiki/Framebuffer#Blitting |
| // to efficiently copy the contents of the old texture to the new texture |
| // TODO: Use ARB_copy_image if available of if we have >=4.3 context |
| if (!m_coreFuncs) { |
| m_coreFuncs = ctx->versionFunctions<QOpenGLFunctions_3_2_Core>(); |
| Q_ASSERT(m_coreFuncs); |
| m_coreFuncs->initializeOpenGLFunctions(); |
| } |
| |
| // Create a framebuffer object to which we can attach our old and new textures (to |
| // the first two color buffer attachment points) |
| if (!m_fboGuard) { |
| GLuint fbo; |
| m_coreFuncs->glGenFramebuffers(1, &fbo); |
| m_fboGuard = new QOpenGLSharedResourceGuard(ctx, fbo, freeFramebufferFunc); |
| } |
| |
| // Bind the FBO to both the GL_READ_FRAMEBUFFER? and GL_DRAW_FRAMEBUFFER targets |
| m_coreFuncs->glBindFramebuffer(GL_FRAMEBUFFER, m_fboGuard->id()); |
| |
| // Bind the old texture to GL_COLOR_ATTACHMENT0 |
| m_coreFuncs->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, |
| GL_TEXTURE_2D, oldTexture, 0); |
| |
| // Bind the new texture to GL_COLOR_ATTACHMENT1 |
| m_coreFuncs->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT1, |
| GL_TEXTURE_2D, texInfo->texture, 0); |
| |
| // Set the source and destination buffers |
| m_coreFuncs->glReadBuffer(GL_COLOR_ATTACHMENT0); |
| m_coreFuncs->glDrawBuffer(GL_COLOR_ATTACHMENT1); |
| |
| // Do the blit |
| m_coreFuncs->glBlitFramebuffer(0, 0, oldWidth, oldHeight, |
| 0, 0, oldWidth, oldHeight, |
| GL_COLOR_BUFFER_BIT, GL_NEAREST); |
| |
| // Reset the default framebuffer |
| QOpenGLFramebufferObject::bindDefault(); |
| |
| return; |
| } else if (useTextureResizeWorkaround()) { |
| #else |
| if (useTextureResizeWorkaround()) { |
| #endif |
| GLint alignment = 4; // default value |
| m_funcs->glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment); |
| m_funcs->glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
| |
| #if !defined(QT_OPENGL_ES_2) |
| const GLenum format = isCoreProfile() ? GL_RED : GL_ALPHA; |
| #else |
| const GLenum format = GL_ALPHA; |
| #endif |
| |
| if (useTextureUploadWorkaround()) { |
| for (int i = 0; i < texInfo->image.height(); ++i) { |
| m_funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, |
| 0, i, oldWidth, 1, |
| format, GL_UNSIGNED_BYTE, |
| texInfo->image.scanLine(i)); |
| } |
| } else { |
| m_funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, |
| 0, 0, oldWidth, oldHeight, |
| format, GL_UNSIGNED_BYTE, |
| texInfo->image.constBits()); |
| } |
| |
| m_funcs->glPixelStorei(GL_UNPACK_ALIGNMENT, alignment); // restore to previous value |
| |
| texInfo->image = texInfo->image.copy(0, 0, width, height); |
| m_funcs->glDeleteTextures(1, &oldTexture); |
| return; |
| } |
| |
| if (!m_blitProgram) |
| createBlitProgram(); |
| |
| Q_ASSERT(m_blitProgram); |
| |
| if (!m_fboGuard) { |
| GLuint fbo; |
| m_funcs->glGenFramebuffers(1, &fbo); |
| m_fboGuard = new QOpenGLSharedResourceGuard(ctx, fbo, freeFramebufferFunc); |
| } |
| m_funcs->glBindFramebuffer(GL_FRAMEBUFFER, m_fboGuard->id()); |
| |
| GLuint tmp_texture; |
| m_funcs->glGenTextures(1, &tmp_texture); |
| m_funcs->glBindTexture(GL_TEXTURE_2D, tmp_texture); |
| m_funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); |
| m_funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); |
| m_funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); |
| m_funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); |
| #if !defined(QT_OPENGL_ES_2) |
| if (!ctx->isOpenGLES()) |
| m_funcs->glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAX_LEVEL, 0); |
| #endif |
| m_funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, oldWidth, oldHeight, 0, |
| GL_RGBA, GL_UNSIGNED_BYTE, nullptr); |
| m_funcs->glBindTexture(GL_TEXTURE_2D, 0); |
| m_funcs->glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, |
| GL_TEXTURE_2D, tmp_texture, 0); |
| |
| m_funcs->glActiveTexture(GL_TEXTURE0); |
| m_funcs->glBindTexture(GL_TEXTURE_2D, oldTexture); |
| |
| // save current render states |
| GLboolean stencilTestEnabled; |
| GLboolean depthTestEnabled; |
| GLboolean scissorTestEnabled; |
| GLboolean blendEnabled; |
| GLint viewport[4]; |
| GLint oldProgram; |
| m_funcs->glGetBooleanv(GL_STENCIL_TEST, &stencilTestEnabled); |
| m_funcs->glGetBooleanv(GL_DEPTH_TEST, &depthTestEnabled); |
| m_funcs->glGetBooleanv(GL_SCISSOR_TEST, &scissorTestEnabled); |
| m_funcs->glGetBooleanv(GL_BLEND, &blendEnabled); |
| m_funcs->glGetIntegerv(GL_VIEWPORT, &viewport[0]); |
| m_funcs->glGetIntegerv(GL_CURRENT_PROGRAM, &oldProgram); |
| |
| m_funcs->glDisable(GL_STENCIL_TEST); |
| m_funcs->glDisable(GL_DEPTH_TEST); |
| m_funcs->glDisable(GL_SCISSOR_TEST); |
| m_funcs->glDisable(GL_BLEND); |
| |
| m_funcs->glViewport(0, 0, oldWidth, oldHeight); |
| |
| const bool vaoInit = m_vao.isCreated(); |
| if (isCoreProfile()) { |
| if ( !vaoInit ) |
| m_vao.create(); |
| m_vao.bind(); |
| } |
| m_blitProgram->bind(); |
| if (!vaoInit || !isCoreProfile()) { |
| m_blitBuffer.bind(); |
| |
| m_blitProgram->enableAttributeArray(int(QT_VERTEX_COORDS_ATTR)); |
| m_blitProgram->enableAttributeArray(int(QT_TEXTURE_COORDS_ATTR)); |
| m_blitProgram->setAttributeBuffer(int(QT_VERTEX_COORDS_ATTR), GL_FLOAT, 0, 2); |
| m_blitProgram->setAttributeBuffer(int(QT_TEXTURE_COORDS_ATTR), GL_FLOAT, 32, 2); |
| } |
| m_blitProgram->disableAttributeArray(int(QT_OPACITY_ATTR)); |
| m_blitProgram->setUniformValue("imageTexture", GLuint(0)); |
| |
| m_funcs->glDrawArrays(GL_TRIANGLE_FAN, 0, 4); |
| |
| m_funcs->glBindTexture(GL_TEXTURE_2D, texInfo->texture); |
| |
| if (useTextureUploadWorkaround()) { |
| for (int i = 0; i < oldHeight; ++i) |
| m_funcs->glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, i, 0, i, oldWidth, 1); |
| } else { |
| m_funcs->glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, oldWidth, oldHeight); |
| } |
| |
| m_funcs->glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, |
| GL_RENDERBUFFER, 0); |
| m_funcs->glDeleteTextures(1, &tmp_texture); |
| m_funcs->glDeleteTextures(1, &oldTexture); |
| |
| QOpenGLFramebufferObject::bindDefault(); |
| |
| // restore render states |
| if (stencilTestEnabled) |
| m_funcs->glEnable(GL_STENCIL_TEST); |
| if (depthTestEnabled) |
| m_funcs->glEnable(GL_DEPTH_TEST); |
| if (scissorTestEnabled) |
| m_funcs->glEnable(GL_SCISSOR_TEST); |
| if (blendEnabled) |
| m_funcs->glEnable(GL_BLEND); |
| m_funcs->glViewport(viewport[0], viewport[1], viewport[2], viewport[3]); |
| m_funcs->glUseProgram(oldProgram); |
| |
| m_blitProgram->disableAttributeArray(int(QT_VERTEX_COORDS_ATTR)); |
| m_blitProgram->disableAttributeArray(int(QT_TEXTURE_COORDS_ATTR)); |
| if (isCoreProfile()) |
| m_vao.release(); |
| } |
| |
| bool QSGOpenGLDistanceFieldGlyphCache::useTextureResizeWorkaround() const |
| { |
| static bool set = false; |
| static bool useWorkaround = false; |
| if (!set) { |
| QOpenGLContextPrivate *ctx_p = static_cast<QOpenGLContextPrivate *>(QOpenGLContextPrivate::get(QOpenGLContext::currentContext())); |
| useWorkaround = ctx_p->workaround_brokenFBOReadBack |
| || qmlUseGlyphCacheWorkaround(); // on some hardware the workaround is faster (see QTBUG-29264) |
| set = true; |
| } |
| return useWorkaround; |
| } |
| |
| bool QSGOpenGLDistanceFieldGlyphCache::useTextureUploadWorkaround() const |
| { |
| static bool set = false; |
| static bool useWorkaround = false; |
| if (!set) { |
| useWorkaround = qstrcmp(reinterpret_cast<const char*>(m_funcs->glGetString(GL_RENDERER)), |
| "Mali-400 MP") == 0; |
| set = true; |
| } |
| return useWorkaround; |
| } |
| |
| bool QSGOpenGLDistanceFieldGlyphCache::createFullSizeTextures() const |
| { |
| return qsgPreferFullSizeGlyphCacheTextures() && glyphCount() > QT_DISTANCEFIELD_HIGHGLYPHCOUNT(); |
| } |
| |
| namespace { |
| struct Qtdf { |
| // We need these structs to be tightly packed, but some compilers we use do not |
| // support #pragma pack(1), so we need to hardcode the offsets/sizes in the |
| // file format |
| enum TableSize { |
| HeaderSize = 14, |
| GlyphRecordSize = 46, |
| TextureRecordSize = 17 |
| }; |
| |
| enum Offset { |
| // Header |
| majorVersion = 0, |
| minorVersion = 1, |
| pixelSize = 2, |
| textureSize = 4, |
| flags = 8, |
| headerPadding = 9, |
| numGlyphs = 10, |
| |
| // Glyph record |
| glyphIndex = 0, |
| textureOffsetX = 4, |
| textureOffsetY = 8, |
| textureWidth = 12, |
| textureHeight = 16, |
| xMargin = 20, |
| yMargin = 24, |
| boundingRectX = 28, |
| boundingRectY = 32, |
| boundingRectWidth = 36, |
| boundingRectHeight = 40, |
| textureIndex = 44, |
| |
| // Texture record |
| allocatedX = 0, |
| allocatedY = 4, |
| allocatedWidth = 8, |
| allocatedHeight = 12, |
| texturePadding = 16 |
| |
| }; |
| |
| template <typename T> |
| static inline T fetch(const char *data, Offset offset) |
| { |
| return qFromBigEndian<T>(data + int(offset)); |
| } |
| }; |
| } |
| |
| bool QSGOpenGLDistanceFieldGlyphCache::loadPregeneratedCache(const QRawFont &font) |
| { |
| // The pregenerated data must be loaded first, otherwise the area allocator |
| // will be wrong |
| if (m_areaAllocator != nullptr) { |
| qWarning("Font cache must be loaded before cache is used"); |
| return false; |
| } |
| |
| static QElapsedTimer timer; |
| |
| bool profile = QSG_LOG_TIME_GLYPH().isDebugEnabled(); |
| if (profile) |
| timer.start(); |
| |
| QByteArray qtdfTable = font.fontTable("qtdf"); |
| if (qtdfTable.isEmpty()) |
| return false; |
| |
| typedef QHash<TextureInfo *, QVector<glyph_t> > GlyphTextureHash; |
| |
| GlyphTextureHash glyphTextures; |
| |
| if (uint(qtdfTable.size()) < Qtdf::HeaderSize) { |
| qWarning("Invalid qtdf table in font '%s'", |
| qPrintable(font.familyName())); |
| return false; |
| } |
| |
| const char *qtdfTableStart = qtdfTable.constData(); |
| const char *qtdfTableEnd = qtdfTableStart + qtdfTable.size(); |
| |
| int padding = 0; |
| int textureCount = 0; |
| { |
| quint8 majorVersion = Qtdf::fetch<quint8>(qtdfTableStart, Qtdf::majorVersion); |
| quint8 minorVersion = Qtdf::fetch<quint8>(qtdfTableStart, Qtdf::minorVersion); |
| if (majorVersion != 5 || minorVersion != 12) { |
| qWarning("Invalid version of qtdf table %d.%d in font '%s'", |
| majorVersion, |
| minorVersion, |
| qPrintable(font.familyName())); |
| return false; |
| } |
| |
| qreal pixelSize = qreal(Qtdf::fetch<quint16>(qtdfTableStart, Qtdf::pixelSize)); |
| m_maxTextureWidth = m_maxTextureHeight = Qtdf::fetch<quint32>(qtdfTableStart, Qtdf::textureSize); |
| m_doubleGlyphResolution = Qtdf::fetch<quint8>(qtdfTableStart, Qtdf::flags) == 1; |
| padding = Qtdf::fetch<quint8>(qtdfTableStart, Qtdf::headerPadding); |
| |
| if (pixelSize <= 0.0) { |
| qWarning("Invalid pixel size in '%s'", qPrintable(font.familyName())); |
| return false; |
| } |
| |
| if (m_maxTextureWidth <= 0) { |
| qWarning("Invalid texture size in '%s'", qPrintable(font.familyName())); |
| return false; |
| } |
| |
| int systemMaxTextureSize; |
| m_funcs->glGetIntegerv(GL_MAX_TEXTURE_SIZE, &systemMaxTextureSize); |
| |
| if (m_maxTextureWidth > systemMaxTextureSize) { |
| qWarning("System maximum texture size is %d. This is lower than the value in '%s', which is %d", |
| systemMaxTextureSize, |
| qPrintable(font.familyName()), |
| m_maxTextureWidth); |
| } |
| |
| if (padding != QSG_OPENGL_DISTANCEFIELD_GLYPH_CACHE_PADDING) { |
| qWarning("Padding mismatch in '%s'. Font requires %d, but Qt is compiled with %d.", |
| qPrintable(font.familyName()), |
| padding, |
| QSG_OPENGL_DISTANCEFIELD_GLYPH_CACHE_PADDING); |
| } |
| |
| m_referenceFont.setPixelSize(pixelSize); |
| |
| quint32 glyphCount = Qtdf::fetch<quint32>(qtdfTableStart, Qtdf::numGlyphs); |
| m_unusedGlyphs.reserve(glyphCount); |
| |
| const char *allocatorData = qtdfTableStart + Qtdf::HeaderSize; |
| { |
| m_areaAllocator = new QSGAreaAllocator(QSize(0, 0)); |
| allocatorData = m_areaAllocator->deserialize(allocatorData, qtdfTableEnd - allocatorData); |
| if (allocatorData == nullptr) |
| return false; |
| } |
| |
| if (m_areaAllocator->size().height() % m_maxTextureHeight != 0) { |
| qWarning("Area allocator size mismatch in '%s'", qPrintable(font.familyName())); |
| return false; |
| } |
| |
| textureCount = m_areaAllocator->size().height() / m_maxTextureHeight; |
| m_maxTextureCount = qMax(m_maxTextureCount, textureCount); |
| |
| const char *textureRecord = allocatorData; |
| for (int i = 0; i < textureCount; ++i, textureRecord += Qtdf::TextureRecordSize) { |
| if (textureRecord + Qtdf::TextureRecordSize > qtdfTableEnd) { |
| qWarning("qtdf table too small in font '%s'.", |
| qPrintable(font.familyName())); |
| return false; |
| } |
| |
| TextureInfo *tex = textureInfo(i); |
| tex->allocatedArea.setX(Qtdf::fetch<quint32>(textureRecord, Qtdf::allocatedX)); |
| tex->allocatedArea.setY(Qtdf::fetch<quint32>(textureRecord, Qtdf::allocatedY)); |
| tex->allocatedArea.setWidth(Qtdf::fetch<quint32>(textureRecord, Qtdf::allocatedWidth)); |
| tex->allocatedArea.setHeight(Qtdf::fetch<quint32>(textureRecord, Qtdf::allocatedHeight)); |
| tex->padding = Qtdf::fetch<quint8>(textureRecord, Qtdf::texturePadding); |
| } |
| |
| const char *glyphRecord = textureRecord; |
| for (quint32 i = 0; i < glyphCount; ++i, glyphRecord += Qtdf::GlyphRecordSize) { |
| if (glyphRecord + Qtdf::GlyphRecordSize > qtdfTableEnd) { |
| qWarning("qtdf table too small in font '%s'.", |
| qPrintable(font.familyName())); |
| return false; |
| } |
| |
| glyph_t glyph = Qtdf::fetch<quint32>(glyphRecord, Qtdf::glyphIndex); |
| m_unusedGlyphs.insert(glyph); |
| |
| GlyphData &glyphData = emptyData(glyph); |
| |
| #define FROM_FIXED_POINT(value) \ |
| (((qreal)value)/(qreal)65536) |
| |
| glyphData.texCoord.x = FROM_FIXED_POINT(Qtdf::fetch<quint32>(glyphRecord, Qtdf::textureOffsetX)); |
| glyphData.texCoord.y = FROM_FIXED_POINT(Qtdf::fetch<quint32>(glyphRecord, Qtdf::textureOffsetY)); |
| glyphData.texCoord.width = FROM_FIXED_POINT(Qtdf::fetch<quint32>(glyphRecord, Qtdf::textureWidth)); |
| glyphData.texCoord.height = FROM_FIXED_POINT(Qtdf::fetch<quint32>(glyphRecord, Qtdf::textureHeight)); |
| glyphData.texCoord.xMargin = FROM_FIXED_POINT(Qtdf::fetch<quint32>(glyphRecord, Qtdf::xMargin)); |
| glyphData.texCoord.yMargin = FROM_FIXED_POINT(Qtdf::fetch<quint32>(glyphRecord, Qtdf::yMargin)); |
| glyphData.boundingRect.setX(FROM_FIXED_POINT(Qtdf::fetch<qint32>(glyphRecord, Qtdf::boundingRectX))); |
| glyphData.boundingRect.setY(FROM_FIXED_POINT(Qtdf::fetch<qint32>(glyphRecord, Qtdf::boundingRectY))); |
| glyphData.boundingRect.setWidth(FROM_FIXED_POINT(Qtdf::fetch<quint32>(glyphRecord, Qtdf::boundingRectWidth))); |
| glyphData.boundingRect.setHeight(FROM_FIXED_POINT(Qtdf::fetch<quint32>(glyphRecord, Qtdf::boundingRectHeight))); |
| |
| #undef FROM_FIXED_POINT |
| |
| int textureIndex = Qtdf::fetch<quint16>(glyphRecord, Qtdf::textureIndex); |
| if (textureIndex < 0 || textureIndex >= textureCount) { |
| qWarning("Invalid texture index %d (texture count == %d) in '%s'", |
| textureIndex, |
| textureCount, |
| qPrintable(font.familyName())); |
| return false; |
| } |
| |
| |
| TextureInfo *texInfo = textureInfo(textureIndex); |
| m_glyphsTexture.insert(glyph, texInfo); |
| |
| glyphTextures[texInfo].append(glyph); |
| } |
| |
| GLint alignment = 4; // default value |
| m_funcs->glGetIntegerv(GL_UNPACK_ALIGNMENT, &alignment); |
| |
| m_funcs->glPixelStorei(GL_UNPACK_ALIGNMENT, 1); |
| |
| const uchar *textureData = reinterpret_cast<const uchar *>(glyphRecord); |
| for (int i = 0; i < textureCount; ++i) { |
| |
| TextureInfo *texInfo = textureInfo(i); |
| |
| int width = texInfo->allocatedArea.width(); |
| int height = texInfo->allocatedArea.height(); |
| qint64 size = width * height; |
| if (reinterpret_cast<const char *>(textureData + size) > qtdfTableEnd) { |
| qWarning("qtdf table too small in font '%s'.", |
| qPrintable(font.familyName())); |
| return false; |
| } |
| |
| createTexture(texInfo, width, height, textureData); |
| |
| QVector<glyph_t> glyphs = glyphTextures.value(texInfo); |
| |
| Texture t; |
| t.textureId = texInfo->texture; |
| t.size = texInfo->size; |
| t.rhiBased = false; |
| |
| setGlyphsTexture(glyphs, t); |
| |
| textureData += size; |
| } |
| |
| m_funcs->glPixelStorei(GL_UNPACK_ALIGNMENT, alignment); |
| } |
| |
| if (profile) { |
| quint64 now = timer.elapsed(); |
| qCDebug(QSG_LOG_TIME_GLYPH, |
| "distancefield: %d pre-generated glyphs loaded in %dms", |
| m_unusedGlyphs.size(), |
| (int) now); |
| } |
| |
| return true; |
| } |
| |
| QT_END_NAMESPACE |