69ab6ec3b7
This makes the blending work correctly when the alpha bits are zero, which is apparently the case with NVidia. svn path=/trunk/KDE/kdebase/workspace/; revision=1102471
273 lines
9 KiB
C++
273 lines
9 KiB
C++
/*
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* Copyright © 2010 Fredrik Höglund <fredrik@kde.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; see the file COPYING. if not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "blur.h"
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#include "blurshader.h"
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#include <X11/Xatom.h>
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namespace KWin
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{
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enum {
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BlurRegionRole = 0x1C50A74B
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};
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KWIN_EFFECT(blur, BlurEffect)
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KWIN_EFFECT_SUPPORTED(blur, BlurEffect::supported())
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BlurEffect::BlurEffect()
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: radius(12)
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{
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shader = BlurShader::create();
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shader->setRadius(radius);
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// Offscreen texture that's used as the target for the horizontal blur pass
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// and the source for the vertical pass.
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tex = new GLTexture(displayWidth(), displayHeight());
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tex->setFilter(GL_LINEAR);
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tex->setWrapMode(GL_CLAMP_TO_EDGE);
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target = new GLRenderTarget(tex);
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net_wm_blur_region = XInternAtom(display(), "_KDE_NET_WM_BLUR_REGION", False);
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effects->registerPropertyType(net_wm_blur_region, true);
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// ### Hackish way to announce support.
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// Should be included in _NET_SUPPORTED instead.
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XChangeProperty(display(), rootWindow(), net_wm_blur_region, net_wm_blur_region,
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32, PropModeReplace, 0, 0);
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}
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BlurEffect::~BlurEffect()
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{
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effects->registerPropertyType(net_wm_blur_region, false);
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XDeleteProperty(display(), rootWindow(), net_wm_blur_region);
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delete shader;
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delete target;
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delete tex;
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}
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void BlurEffect::updateBlurRegion(EffectWindow *w) const
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{
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QRegion region;
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const QByteArray value = w->readProperty(net_wm_blur_region, XA_CARDINAL, 32);
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if (value.size() > 0 && !(value.size() % (4 * sizeof(quint32)))) {
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const quint32 *cardinals = reinterpret_cast<const quint32*>(value.constData());
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for (unsigned int i = 0; i < value.size() / sizeof(quint32);) {
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int x = cardinals[i++];
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int y = cardinals[i++];
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int w = cardinals[i++];
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int h = cardinals[i++];
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region += QRect(x, y, w, h);
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}
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}
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w->setData(BlurRegionRole, value.isNull() ? QVariant() : region);
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}
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void BlurEffect::windowAdded(EffectWindow *w)
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{
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updateBlurRegion(w);
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}
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void BlurEffect::propertyNotify(EffectWindow *w, long atom)
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{
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if (w && atom == net_wm_blur_region)
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updateBlurRegion(w);
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}
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bool BlurEffect::supported()
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{
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return GLRenderTarget::supported() && GLTexture::NPOTTextureSupported() &&
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((GLShader::vertexShaderSupported() && GLShader::fragmentShaderSupported()) ||
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hasGLExtension("GL_ARB_fragment_program"));
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}
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QRect BlurEffect::expand(const QRect &rect) const
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{
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return rect.adjusted(-radius, -radius, radius, radius);
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}
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QRegion BlurEffect::expand(const QRegion ®ion) const
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{
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QRegion expanded;
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if (region.rectCount() < 10) {
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foreach (const QRect &rect, region.rects())
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expanded += expand(rect);
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} else
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expanded += expand(region.boundingRect());
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return expanded;
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}
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QRegion BlurEffect::blurRegion(const EffectWindow *w) const
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{
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QRegion region;
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const QVariant value = w->data(BlurRegionRole);
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if (value.isValid()) {
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const QRegion appRegion = qvariant_cast<QRegion>(value);
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if (!appRegion.isEmpty()) {
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if (w->hasDecoration()) {
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region = w->shape();
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region -= w->contentsRect();
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region |= appRegion.translated(w->contentsRect().topLeft()) &
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w->contentsRect();
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} else
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region = appRegion & w->contentsRect();
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} else
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region = w->shape();
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} else
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region = w->shape();
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return region;
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}
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void BlurEffect::paintScreen(int mask, QRegion region, ScreenPaintData &data)
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{
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// Force the scene to call paintGenericScreen() so the windows are painted bottom -> top
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if (!effects->activeFullScreenEffect())
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mask |= PAINT_SCREEN_WITH_TRANSFORMED_WINDOWS;
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effects->paintScreen(mask, region, data);
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}
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void BlurEffect::drawWindow(EffectWindow *w, int mask, QRegion region, WindowPaintData &data)
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{
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const QRect screen(0, 0, displayWidth(), displayHeight());
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bool scaled = !qFuzzyCompare(data.xScale, 1.0) && !qFuzzyCompare(data.yScale, 1.0);
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bool translated = data.xTranslate || data.yTranslate;
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bool transformed = scaled || translated;
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bool hasAlpha = w->hasAlpha() || (w->hasDecoration() && effects->decorationsHaveAlpha());
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bool valid = target->valid() && shader->isValid();
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QRegion shape;
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if (!effects->activeFullScreenEffect() && hasAlpha && !w->isDesktop() && !transformed)
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shape = blurRegion(w).translated(w->geometry().topLeft()) & screen;
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if (valid && !shape.isEmpty() && region.intersects(shape.boundingRect()))
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{
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const QRect r = expand(shape.boundingRect()) & screen;
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const QPoint offset = -shape.boundingRect().topLeft() +
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(shape.boundingRect().topLeft() - r.topLeft());
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// Create a scratch texture and copy the area in the back buffer that we're
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// going to blur into it
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GLTexture scratch(r.width(), r.height());
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scratch.setFilter(GL_LINEAR);
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scratch.setWrapMode(GL_CLAMP_TO_EDGE);
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scratch.bind();
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glCopyTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, r.x(), displayHeight() - r.y() - r.height(),
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r.width(), r.height());
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// Draw the texture on the offscreen framebuffer object, while blurring it horizontally
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effects->pushRenderTarget(target);
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glClear(GL_COLOR_BUFFER_BIT);
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shader->bind();
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shader->setDirection(Qt::Horizontal);
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shader->setPixelDistance(1.0 / r.width());
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glBegin(GL_QUADS);
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glTexCoord2f(0, 1); glVertex2i(0, 0);
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glTexCoord2f(1, 1); glVertex2i(r.width(), 0);
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glTexCoord2f(1, 0); glVertex2i(r.width(), r.height());
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glTexCoord2f(0, 0); glVertex2i(0, r.height());
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glEnd();
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effects->popRenderTarget();
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scratch.unbind();
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scratch.discard();
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// Now draw the horizontally blurred area back to the backbuffer, while
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// blurring it vertically and clipping it to the window shape.
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tex->bind();
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shader->setDirection(Qt::Vertical);
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shader->setPixelDistance(1.0 / tex->height());
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// Modulate the blurred texture with the window opacity if the window isn't opaque
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const float opacity = data.opacity * data.contents_opacity;
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if (opacity < 1.0) {
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glPushAttrib(GL_COLOR_BUFFER_BIT);
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glEnable(GL_BLEND);
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glBlendColor(0, 0, 0, opacity);
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glBlendFunc(GL_CONSTANT_ALPHA, GL_ONE_MINUS_CONSTANT_ALPHA);
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}
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int vertexCount = shape.rectCount() * 4;
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if (vertices.size() < vertexCount)
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vertices.resize(vertexCount);
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// Set the up the texture matrix to transform from screen coordinates
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// to texture coordinates.
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glMatrixMode(GL_TEXTURE);
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glPushMatrix();
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glLoadIdentity();
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glScalef(1.0 / tex->width(), -1.0 / tex->height(), 1);
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glTranslatef(offset.x(), -tex->height() + offset.y(), 0);
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int i = 0;
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foreach (const QRect &r, shape.rects()) {
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vertices[i++] = QVector2D(r.x(), r.y());
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vertices[i++] = QVector2D(r.x() + r.width(), r.y());
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vertices[i++] = QVector2D(r.x() + r.width(), r.y() + r.height());
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vertices[i++] = QVector2D(r.x(), r.y() + r.height());
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}
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if (vertexCount > 1000) {
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glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
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glEnableClientState(GL_VERTEX_ARRAY);
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glEnableClientState(GL_TEXTURE_COORD_ARRAY);
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glTexCoordPointer(2, GL_FLOAT, 0, (float*)vertices.constData());
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glVertexPointer(2, GL_FLOAT, 0, (float*)vertices.constData());
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glDrawArrays(GL_QUADS, 0, vertexCount);
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glPopClientAttrib();
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} else {
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glBegin(GL_QUADS);
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for (int i = 0; i < vertexCount; i++) {
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glTexCoord2fv((const float*)&vertices[i]);
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glVertex2fv((const float*)&vertices[i]);
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}
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glEnd();
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}
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glPopMatrix();
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glMatrixMode(GL_MODELVIEW);
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if (opacity < 1.0)
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glPopAttrib();
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tex->unbind();
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shader->unbind();
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}
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// Draw the window over the blurred area
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effects->drawWindow(w, mask, region, data);
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}
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} // namespace KWin
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