--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/opengl/gl2paintengineex/qtextureglyphcache_gl.cpp Fri Feb 19 23:40:16 2010 +0200
@@ -0,0 +1,245 @@
+/****************************************************************************
+**
+** Copyright (C) 2010 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_RGBA, 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);
+
+ GLfloat* vertexCoordinateArray = pex->staticVertexCoordinateArray;
+ vertexCoordinateArray[0] = -1.0f;
+ vertexCoordinateArray[1] = -1.0f;
+ vertexCoordinateArray[2] = 1.0f;
+ vertexCoordinateArray[3] = -1.0f;
+ vertexCoordinateArray[4] = 1.0f;
+ vertexCoordinateArray[5] = 1.0f;
+ vertexCoordinateArray[6] = -1.0f;
+ vertexCoordinateArray[7] = 1.0f;
+
+ GLfloat* textureCoordinateArray = pex->staticTextureCoordinateArray;
+ textureCoordinateArray[0] = 0.0f;
+ textureCoordinateArray[1] = 0.0f;
+ textureCoordinateArray[2] = 1.0f;
+ textureCoordinateArray[3] = 0.0f;
+ textureCoordinateArray[4] = 1.0f;
+ textureCoordinateArray[5] = 1.0f;
+ textureCoordinateArray[6] = 0.0f;
+ textureCoordinateArray[7] = 1.0f;
+
+ pex->setVertexAttributePointer(QT_VERTEX_COORDS_ATTR, vertexCoordinateArray);
+ pex->setVertexAttributePointer(QT_TEXTURE_COORDS_ATTR, 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
+ }
+ } else if (mask.format() == QImage::Format_RGB32) {
+ // 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) {
+ uchar r = src[x] >> 16;
+ uchar g = src[x] >> 8;
+ uchar b = src[x];
+ quint32 avg = (quint32(r) + quint32(g) + quint32(b) + 1) / 3; // "+1" for rounding.
+ src[x] = (src[x] & 0x00ffffff) | (avg << 24);
+ }
+ }
+ }
+
+ 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
+}