| /**************************************************************************** |
| ** |
| ** Copyright (C) 2016 The Qt Company Ltd. |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the QtGui module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
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| ** General Public License version 3 as published by the Free Software |
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| ** packaging of this file. Please review the following information to |
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| ** 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 |
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| ** $QT_END_LICENSE$ |
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| ****************************************************************************/ |
| |
| #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_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(0) |
| , pex(0) |
| , m_blitProgram(0) |
| , 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 == 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 |
| 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 == 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); |
| 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, NULL); |
| 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 != 0) |
| 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 = 0; |
| if (pex == 0) { |
| if (m_blitProgram == 0) { |
| 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 != 0) { |
| 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 == 0) { |
| 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 == 0) |
| return QImageTextureGlyphCache::maxTextureWidth(); |
| else |
| return ctx->d_func()->maxTextureSize(); |
| } |
| |
| int QOpenGLTextureGlyphCache::maxTextureHeight() const |
| { |
| QOpenGLContext *ctx = const_cast<QOpenGLContext *>(QOpenGLContext::currentContext()); |
| if (ctx == 0) |
| 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; |
| |
| delete m_blitProgram; |
| m_blitProgram = 0; |
| |
| m_w = 0; |
| m_h = 0; |
| m_cx = 0; |
| m_cy = 0; |
| m_currentRowHeight = 0; |
| coords.clear(); |
| } |
| |
| QT_END_NAMESPACE |