| /**************************************************************************** |
| ** |
| ** 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 |
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| ** 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 |
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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 "qtextureglyphcache_gl_p.h" |
| #include "qpaintengineex_opengl2_p.h" |
| #include "qglfunctions.h" |
| #include "private/qglengineshadersource_p.h" |
| |
| QT_BEGIN_NAMESPACE |
| |
| |
| static int next_qgltextureglyphcache_serial_number() |
| { |
| static QBasicAtomicInt serial = Q_BASIC_ATOMIC_INITIALIZER(0); |
| return 1 + serial.fetchAndAddRelaxed(1); |
| } |
| |
| QGLTextureGlyphCache::QGLTextureGlyphCache(QFontEngine::GlyphFormat format, const QTransform &matrix) |
| : QImageTextureGlyphCache(format, matrix) |
| , m_textureResource(0) |
| , pex(0) |
| , m_blitProgram(0) |
| , m_filterMode(Nearest) |
| , m_serialNumber(next_qgltextureglyphcache_serial_number()) |
| { |
| #ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG |
| qDebug(" -> QGLTextureGlyphCache() %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; |
| } |
| |
| QGLTextureGlyphCache::~QGLTextureGlyphCache() |
| { |
| #ifdef QT_GL_TEXTURE_GLYPH_CACHE_DEBUG |
| qDebug(" -> ~QGLTextureGlyphCache() %p.", this); |
| #endif |
| delete m_blitProgram; |
| if (m_textureResource) |
| m_textureResource->free(); |
| } |
| |
| void QGLTextureGlyphCache::createTextureData(int width, int height) |
| { |
| QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext()); |
| if (ctx == 0) { |
| qWarning("QGLTextureGlyphCache::createTextureData: Called with no context"); |
| return; |
| } |
| QOpenGLFunctions *funcs = ctx->contextHandle()->functions(); |
| |
| // 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 ((!QGLFramebufferObject::hasOpenGLFramebufferObjects() || ctx->d_ptr->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 QGLGlyphTexture(ctx); |
| |
| 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) { |
| 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; |
| funcs->glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0, GL_ALPHA, 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; |
| } |
| |
| void QGLTextureGlyphCache::resizeTextureData(int width, int height) |
| { |
| QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext()); |
| if (ctx == 0) { |
| qWarning("QGLTextureGlyphCache::resizeTextureData: Called with no context"); |
| return; |
| } |
| QOpenGLFunctions *funcs = ctx->contextHandle()->functions(); |
| |
| 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 (!QGLFramebufferObject::hasOpenGLFramebufferObjects() || ctx->d_ptr->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 |
| |
| ctx->d_ptr->refreshCurrentFbo(); |
| |
| 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); |
| |
| QGLShaderProgram *blitProgram = 0; |
| if (pex == 0) { |
| if (m_blitProgram == 0) { |
| m_blitProgram = new QGLShaderProgram(ctx); |
| |
| { |
| QString source; |
| source.append(QLatin1String(qglslMainWithTexCoordsVertexShader)); |
| source.append(QLatin1String(qglslUntransformedPositionVertexShader)); |
| |
| QGLShader *vertexShader = new QGLShader(QGLShader::Vertex, m_blitProgram); |
| vertexShader->compileSourceCode(source); |
| |
| m_blitProgram->addShader(vertexShader); |
| } |
| |
| { |
| QString source; |
| source.append(QLatin1String(qglslMainFragmentShader)); |
| source.append(QLatin1String(qglslImageSrcFragmentShader)); |
| |
| QGLShader *fragmentShader = new QGLShader(QGLShader::Fragment, m_blitProgram); |
| fragmentShader->compileSourceCode(source); |
| |
| m_blitProgram->addShader(fragmentShader); |
| } |
| |
| m_blitProgram->bindAttributeLocation("vertexCoordsArray", QT_VERTEX_COORDS_ATTR); |
| m_blitProgram->bindAttributeLocation("textureCoordArray", QT_TEXTURE_COORDS_ATTR); |
| |
| m_blitProgram->link(); |
| } |
| |
| funcs->glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, m_vertexCoordinateArray); |
| funcs->glVertexAttribPointer(QT_TEXTURE_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, m_textureCoordinateArray); |
| |
| m_blitProgram->bind(); |
| m_blitProgram->enableAttributeArray(int(QT_VERTEX_COORDS_ATTR)); |
| m_blitProgram->enableAttributeArray(int(QT_TEXTURE_COORDS_ATTR)); |
| m_blitProgram->disableAttributeArray(int(QT_OPACITY_ATTR)); |
| |
| blitProgram = m_blitProgram; |
| |
| } else { |
| pex->setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, m_vertexCoordinateArray); |
| pex->setVertexAttributePointer(QT_TEXTURE_COORDS_ATTR, m_textureCoordinateArray); |
| |
| 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, ctx->d_ptr->current_fbo); |
| |
| if (pex != 0) { |
| funcs->glViewport(0, 0, pex->width, pex->height); |
| pex->updateClipScissorTest(); |
| } |
| } |
| |
| void QGLTextureGlyphCache::fillTexture(const Coord &c, glyph_t glyph, QFixed subPixelPosition) |
| { |
| QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext()); |
| if (ctx == 0) { |
| qWarning("QGLTextureGlyphCache::fillTexture: Called with no context"); |
| return; |
| } |
| QOpenGLFunctions *funcs = ctx->contextHandle()->functions(); |
| |
| if (!QGLFramebufferObject::hasOpenGLFramebufferObjects() || ctx->d_ptr->workaround_brokenFBOReadBack) { |
| QImageTextureGlyphCache::fillTexture(c, glyph, subPixelPosition); |
| |
| funcs->glBindTexture(GL_TEXTURE_2D, m_textureResource->m_texture); |
| const QImage &texture = image(); |
| const uchar *bits = texture.constBits(); |
| bits += c.y * texture.bytesPerLine() + c.x; |
| for (int i=0; i<c.h; ++i) { |
| funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y + i, c.w, 1, GL_ALPHA, GL_UNSIGNED_BYTE, bits); |
| bits += texture.bytesPerLine(); |
| } |
| return; |
| } |
| |
| QImage mask = textureMapForGlyph(glyph, subPixelPosition); |
| const int maskWidth = mask.width(); |
| const int maskHeight = mask.height(); |
| |
| if (mask.format() == QImage::Format_Mono) { |
| mask = mask.convertToFormat(QImage::Format_Indexed8); |
| for (int y = 0; y < maskHeight; ++y) { |
| uchar *src = (uchar *) mask.scanLine(y); |
| for (int x = 0; x < maskWidth; ++x) |
| src[x] = -src[x]; // convert 0 and 1 into 0 and 255 |
| } |
| } else if (mask.depth() == 32) { |
| // Make the alpha component equal to the average of the RGB values. |
| // This is needed when drawing sub-pixel antialiased text on translucent targets. |
| for (int y = 0; y < maskHeight; ++y) { |
| quint32 *src = (quint32 *) mask.scanLine(y); |
| for (int x = 0; x < maskWidth; ++x) { |
| int r = qRed(src[x]); |
| int g = qGreen(src[x]); |
| int b = qBlue(src[x]); |
| int avg; |
| if (mask.format() == QImage::Format_RGB32) |
| avg = (r + g + b + 1) / 3; // "+1" for rounding. |
| else // Format_ARGB_Premultiplied |
| avg = qAlpha(src[x]); |
| if (ctx->contextHandle()->isOpenGLES()) { |
| // swizzle the bits to accommodate for the GL_RGBA upload. |
| src[x] = (avg << 24) | (r << 0) | (g << 8) | (b << 16); |
| } else { |
| src[x] = (src[x] & 0x00ffffff) | (avg << 24); |
| } |
| } |
| } |
| } |
| |
| funcs->glBindTexture(GL_TEXTURE_2D, m_textureResource->m_texture); |
| if (mask.depth() == 32) { |
| GLenum format = GL_RGBA; |
| #if !defined(QT_OPENGL_ES_2) |
| if (!ctx->contextHandle()->isOpenGLES()) |
| format = GL_BGRA; |
| #endif |
| funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, format, GL_UNSIGNED_BYTE, mask.bits()); |
| } else { |
| // glTexSubImage2D() might cause some garbage to appear in the texture if the mask width is |
| // not a multiple of four bytes. The bug appeared on a computer with 32-bit Windows Vista |
| // and nVidia GeForce 8500GT. GL_UNPACK_ALIGNMENT is set to four bytes, 'mask' has a |
| // multiple of four bytes per line, and most of the glyph shows up correctly in the |
| // texture, which makes me think that this is a driver bug. |
| // One workaround is to make sure the mask width is a multiple of four bytes, for instance |
| // by converting it to a format with four bytes per pixel. Another is to copy one line at a |
| // time. |
| |
| if (!ctx->d_ptr->workaround_brokenAlphaTexSubImage_init) { |
| // don't know which driver versions exhibit this bug, so be conservative for now |
| const QByteArray vendorString(reinterpret_cast<const char*>(funcs->glGetString(GL_VENDOR))); |
| ctx->d_ptr->workaround_brokenAlphaTexSubImage = vendorString.indexOf("NVIDIA") >= 0; |
| ctx->d_ptr->workaround_brokenAlphaTexSubImage_init = true; |
| } |
| |
| if (ctx->d_ptr->workaround_brokenAlphaTexSubImage) { |
| for (int i = 0; i < maskHeight; ++i) |
| funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y + i, maskWidth, 1, GL_ALPHA, GL_UNSIGNED_BYTE, mask.scanLine(i)); |
| } else { |
| funcs->glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, GL_ALPHA, GL_UNSIGNED_BYTE, mask.bits()); |
| } |
| } |
| } |
| |
| int QGLTextureGlyphCache::glyphPadding() const |
| { |
| return 1; |
| } |
| |
| int QGLTextureGlyphCache::maxTextureWidth() const |
| { |
| QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext()); |
| if (ctx == 0) |
| return QImageTextureGlyphCache::maxTextureWidth(); |
| else |
| return ctx->d_ptr->maxTextureSize(); |
| } |
| |
| int QGLTextureGlyphCache::maxTextureHeight() const |
| { |
| QGLContext *ctx = const_cast<QGLContext *>(QGLContext::currentContext()); |
| if (ctx == 0) |
| return QImageTextureGlyphCache::maxTextureHeight(); |
| |
| if (ctx->d_ptr->workaround_brokenTexSubImage) |
| return qMin(1024, ctx->d_ptr->maxTextureSize()); |
| else |
| return ctx->d_ptr->maxTextureSize(); |
| } |
| |
| void QGLTextureGlyphCache::clear() |
| { |
| 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 |