diff options
Diffstat (limited to 'src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp')
| -rw-r--r-- | src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp b/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp new file mode 100644 index 0000000..047876f --- /dev/null +++ b/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp @@ -0,0 +1,216 @@ +/**************************************************************************** +** +** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtOpenGL module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** 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 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "qtextureglyphcache_gl_p.h" +#include "qpaintengineex_opengl2_p.h" + +#ifdef Q_WS_WIN +extern Q_GUI_EXPORT bool qt_cleartype_enabled; +#endif + +QGLTextureGlyphCache::QGLTextureGlyphCache(QGLContext *context, QFontEngineGlyphCache::Type type, const QTransform &matrix) + : QTextureGlyphCache(type, matrix) + , ctx(context) + , m_width(0) + , m_height(0) +{ + glGenFramebuffers(1, &m_fbo); + connect(QGLSignalProxy::instance(), SIGNAL(aboutToDestroyContext(const QGLContext*)), + SLOT(contextDestroyed(const QGLContext*))); +} + +QGLTextureGlyphCache::~QGLTextureGlyphCache() +{ + if (ctx) { + QGLShareContextScope scope(ctx); + glDeleteFramebuffers(1, &m_fbo); + + if (m_width || m_height) + glDeleteTextures(1, &m_texture); + } +} + +void QGLTextureGlyphCache::createTextureData(int width, int height) +{ + glGenTextures(1, &m_texture); + glBindTexture(GL_TEXTURE_2D, m_texture); + + m_width = width; + m_height = height; + + QVarLengthArray<uchar> data(width * height); + for (int i = 0; i < data.size(); ++i) + data[i] = 0; + + if (m_type == QFontEngineGlyphCache::Raster_RGBMask) + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, &data[0]); + else + glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, width, height, 0, GL_ALPHA, GL_UNSIGNED_BYTE, &data[0]); + + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); +} + +void QGLTextureGlyphCache::resizeTextureData(int width, int height) +{ + // ### the QTextureGlyphCache API needs to be reworked to allow + // ### resizeTextureData to fail + + int oldWidth = m_width; + int oldHeight = m_height; + + GLuint oldTexture = m_texture; + createTextureData(width, height); + + glBindFramebuffer(GL_FRAMEBUFFER_EXT, m_fbo); + + GLuint tmp_texture; + glGenTextures(1, &tmp_texture); + glBindTexture(GL_TEXTURE_2D, tmp_texture); + glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, oldWidth, oldHeight, 0, + GL_RGBA, GL_UNSIGNED_BYTE, NULL); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE); + glBindTexture(GL_TEXTURE_2D, 0); + glFramebufferTexture2D(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, + GL_TEXTURE_2D, tmp_texture, 0); + + glActiveTexture(GL_TEXTURE0 + QT_IMAGE_TEXTURE_UNIT); + glBindTexture(GL_TEXTURE_2D, oldTexture); + + pex->transferMode(BrushDrawingMode); + + glDisable(GL_STENCIL_TEST); + glDisable(GL_DEPTH_TEST); + glDisable(GL_SCISSOR_TEST); + glDisable(GL_BLEND); + + glViewport(0, 0, oldWidth, oldHeight); + + float vertexCoordinateArray[] = { -1, -1, 1, -1, 1, 1, -1, 1 }; + float textureCoordinateArray[] = { 0, 0, 1, 0, 1, 1, 0, 1 }; + + glVertexAttribPointer(QT_VERTEX_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, vertexCoordinateArray); + glVertexAttribPointer(QT_TEXTURE_COORDS_ATTR, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinateArray); + + pex->shaderManager->useBlitProgram(); + pex->shaderManager->blitProgram()->setUniformValue("imageTexture", QT_IMAGE_TEXTURE_UNIT); + + glDrawArrays(GL_TRIANGLE_FAN, 0, 4); + + glBindTexture(GL_TEXTURE_2D, m_texture); + +#ifdef QT_OPENGL_ES_2 + QDataBuffer<uchar> buffer(4*oldWidth*oldHeight); + buffer.resize(4*oldWidth*oldHeight); + glReadPixels(0, 0, oldWidth, oldHeight, GL_RGBA, GL_UNSIGNED_BYTE, buffer.data()); + + // do an in-place conversion from GL_RGBA to GL_ALPHA + for (int i=0; i<oldWidth*oldHeight; ++i) + buffer.data()[i] = buffer.at(4*i + 3); + + glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, oldWidth, oldHeight, + GL_ALPHA, GL_UNSIGNED_BYTE, buffer.data()); +#else + glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, 0, 0, oldWidth, oldHeight); +#endif + + glFramebufferRenderbuffer(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, + GL_RENDERBUFFER_EXT, 0); + glDeleteTextures(1, &tmp_texture); + glDeleteTextures(1, &oldTexture); + + glBindFramebuffer(GL_FRAMEBUFFER_EXT, ctx->d_ptr->current_fbo); + + glViewport(0, 0, pex->width, pex->height); + pex->updateClipScissorTest(); +} + +void QGLTextureGlyphCache::fillTexture(const Coord &c, glyph_t glyph) +{ + QImage mask = textureMapForGlyph(glyph); + 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 + } + } + + + glBindTexture(GL_TEXTURE_2D, m_texture); + if (mask.format() == QImage::Format_RGB32) { + glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, GL_BGRA, GL_UNSIGNED_BYTE, mask.bits()); + } else { +#ifdef QT_OPENGL_ES2 + glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y, maskWidth, maskHeight, GL_ALPHA, 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. + + for (int i = 0; i < maskHeight; ++i) + glTexSubImage2D(GL_TEXTURE_2D, 0, c.x, c.y + i, maskWidth, 1, GL_ALPHA, GL_UNSIGNED_BYTE, mask.scanLine(i)); +#endif + } +} + +int QGLTextureGlyphCache::glyphMargin() const +{ +#if defined(Q_WS_MAC) + return 2; +#elif defined (Q_WS_X11) + return 0; +#else + return m_type == QFontEngineGlyphCache::Raster_RGBMask ? 2 : 0; +#endif +} |