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Diffstat (limited to 'src/kitemviews/private/kpixmapmodifier.cpp')
| -rw-r--r-- | src/kitemviews/private/kpixmapmodifier.cpp | 400 |
1 files changed, 400 insertions, 0 deletions
diff --git a/src/kitemviews/private/kpixmapmodifier.cpp b/src/kitemviews/private/kpixmapmodifier.cpp new file mode 100644 index 000000000..29aceb66b --- /dev/null +++ b/src/kitemviews/private/kpixmapmodifier.cpp @@ -0,0 +1,400 @@ +// krazy:excludeall=copyright (email of Maxim is missing) +/* + This file is a part of the KDE project + + Copyright © 2006 Zack Rusin <[email protected]> + Copyright © 2006-2007, 2008 Fredrik Höglund <[email protected]> + + The stack blur algorithm was invented by Mario Klingemann <[email protected]> + + This implementation is based on the version in Anti-Grain Geometry Version 2.4, + Copyright © 2002-2005 Maxim Shemanarev (http://www.antigrain.com) + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + 1. Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + 2. Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +*/ + +#include "kpixmapmodifier.h" + +#include <QImage> +#include <QPainter> +#include <QPixmap> +#include <QSize> + +#include <KDebug> + +#include <config-X11.h> // for HAVE_XRENDER +#if defined(Q_WS_X11) && defined(HAVE_XRENDER) +# include <QX11Info> +# include <X11/Xlib.h> +# include <X11/extensions/Xrender.h> +#endif + +static const quint32 stackBlur8Mul[255] = +{ + 512,512,456,512,328,456,335,512,405,328,271,456,388,335,292,512, + 454,405,364,328,298,271,496,456,420,388,360,335,312,292,273,512, + 482,454,428,405,383,364,345,328,312,298,284,271,259,496,475,456, + 437,420,404,388,374,360,347,335,323,312,302,292,282,273,265,512, + 497,482,468,454,441,428,417,405,394,383,373,364,354,345,337,328, + 320,312,305,298,291,284,278,271,265,259,507,496,485,475,465,456, + 446,437,428,420,412,404,396,388,381,374,367,360,354,347,341,335, + 329,323,318,312,307,302,297,292,287,282,278,273,269,265,261,512, + 505,497,489,482,475,468,461,454,447,441,435,428,422,417,411,405, + 399,394,389,383,378,373,368,364,359,354,350,345,341,337,332,328, + 324,320,316,312,309,305,301,298,294,291,287,284,281,278,274,271, + 268,265,262,259,257,507,501,496,491,485,480,475,470,465,460,456, + 451,446,442,437,433,428,424,420,416,412,408,404,400,396,392,388, + 385,381,377,374,370,367,363,360,357,354,350,347,344,341,338,335, + 332,329,326,323,320,318,315,312,310,307,304,302,299,297,294,292, + 289,287,285,282,280,278,275,273,271,269,267,265,263,261,259 +}; + +static const quint32 stackBlur8Shr[255] = +{ + 9, 11, 12, 13, 13, 14, 14, 15, 15, 15, 15, 16, 16, 16, 16, 17, + 17, 17, 17, 17, 17, 17, 18, 18, 18, 18, 18, 18, 18, 18, 18, 19, + 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 19, 20, 20, 20, + 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, + 21, 21, 21, 21, 21, 21, 21, 21, 21, 21, 22, 22, 22, 22, 22, 22, + 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, + 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 22, 23, + 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, + 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, + 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, 23, + 23, 23, 23, 23, 23, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24 +}; + +static void blurHorizontal(QImage& image, unsigned int* stack, int div, int radius) +{ + int stackindex; + int stackstart; + + quint32 * const pixels = reinterpret_cast<quint32 *>(image.bits()); + quint32 pixel; + + int w = image.width(); + int h = image.height(); + int wm = w - 1; + + unsigned int mulSum = stackBlur8Mul[radius]; + unsigned int shrSum = stackBlur8Shr[radius]; + + unsigned int sum, sumIn, sumOut; + + for (int y = 0; y < h; y++) { + sum = 0; + sumIn = 0; + sumOut = 0; + + const int yw = y * w; + pixel = pixels[yw]; + for (int i = 0; i <= radius; i++) { + stack[i] = qAlpha(pixel); + + sum += stack[i] * (i + 1); + sumOut += stack[i]; + } + + for (int i = 1; i <= radius; i++) { + pixel = pixels[yw + qMin(i, wm)]; + + unsigned int* stackpix = &stack[i + radius]; + *stackpix = qAlpha(pixel); + + sum += *stackpix * (radius + 1 - i); + sumIn += *stackpix; + } + + stackindex = radius; + for (int x = 0, i = yw; x < w; x++) { + pixels[i++] = (((sum * mulSum) >> shrSum) << 24) & 0xff000000; + + sum -= sumOut; + + stackstart = stackindex + div - radius; + if (stackstart >= div) { + stackstart -= div; + } + + unsigned int* stackpix = &stack[stackstart]; + + sumOut -= *stackpix; + + pixel = pixels[yw + qMin(x + radius + 1, wm)]; + + *stackpix = qAlpha(pixel); + + sumIn += *stackpix; + sum += sumIn; + + if (++stackindex >= div) { + stackindex = 0; + } + + stackpix = &stack[stackindex]; + + sumOut += *stackpix; + sumIn -= *stackpix; + } + } +} + +static void blurVertical(QImage& image, unsigned int* stack, int div, int radius) +{ + int stackindex; + int stackstart; + + quint32 * const pixels = reinterpret_cast<quint32 *>(image.bits()); + quint32 pixel; + + int w = image.width(); + int h = image.height(); + int hm = h - 1; + + int mul_sum = stackBlur8Mul[radius]; + int shr_sum = stackBlur8Shr[radius]; + + unsigned int sum, sumIn, sumOut; + + for (int x = 0; x < w; x++) { + sum = 0; + sumIn = 0; + sumOut = 0; + + pixel = pixels[x]; + for (int i = 0; i <= radius; i++) { + stack[i] = qAlpha(pixel); + + sum += stack[i] * (i + 1); + sumOut += stack[i]; + } + + for (int i = 1; i <= radius; i++) { + pixel = pixels[qMin(i, hm) * w + x]; + + unsigned int* stackpix = &stack[i + radius]; + *stackpix = qAlpha(pixel); + + sum += *stackpix * (radius + 1 - i); + sumIn += *stackpix; + } + + stackindex = radius; + for (int y = 0, i = x; y < h; y++, i += w) { + pixels[i] = (((sum * mul_sum) >> shr_sum) << 24) & 0xff000000; + + sum -= sumOut; + + stackstart = stackindex + div - radius; + if (stackstart >= div) + stackstart -= div; + + unsigned int* stackpix = &stack[stackstart]; + + sumOut -= *stackpix; + + pixel = pixels[qMin(y + radius + 1, hm) * w + x]; + + *stackpix = qAlpha(pixel); + + sumIn += *stackpix; + sum += sumIn; + + if (++stackindex >= div) { + stackindex = 0; + } + + stackpix = &stack[stackindex]; + + sumOut += *stackpix; + sumIn -= *stackpix; + } + } +} + +static void stackBlur(QImage& image, float radius) +{ + radius = qRound(radius); + + int div = int(radius * 2) + 1; + unsigned int* stack = new unsigned int[div]; + + blurHorizontal(image, stack, div, radius); + blurVertical(image, stack, div, radius); + + delete [] stack; +} + +static void shadowBlur(QImage& image, float radius, const QColor& color) +{ + if (radius < 0) { + return; + } + + if (radius > 0) { + stackBlur(image, radius); + } + + // Correct the color and opacity of the shadow + QPainter p(&image); + p.setCompositionMode(QPainter::CompositionMode_SourceIn); + p.fillRect(image.rect(), color); +} + +namespace { + /** Helper class for drawing frames for KPixmapModifier::applyFrame(). */ + class TileSet + { + public: + enum { LeftMargin = 3, TopMargin = 2, RightMargin = 3, BottomMargin = 4 }; + + enum Tile { TopLeftCorner = 0, TopSide, TopRightCorner, LeftSide, + RightSide, BottomLeftCorner, BottomSide, BottomRightCorner, + NumTiles }; + + TileSet() + { + QImage image(8 * 3, 8 * 3, QImage::Format_ARGB32_Premultiplied); + + QPainter p(&image); + p.setCompositionMode(QPainter::CompositionMode_Source); + p.fillRect(image.rect(), Qt::transparent); + p.fillRect(image.rect().adjusted(3, 3, -3, -3), Qt::black); + p.end(); + + shadowBlur(image, 3, Qt::black); + + QPixmap pixmap = QPixmap::fromImage(image); + m_tiles[TopLeftCorner] = pixmap.copy(0, 0, 8, 8); + m_tiles[TopSide] = pixmap.copy(8, 0, 8, 8); + m_tiles[TopRightCorner] = pixmap.copy(16, 0, 8, 8); + m_tiles[LeftSide] = pixmap.copy(0, 8, 8, 8); + m_tiles[RightSide] = pixmap.copy(16, 8, 8, 8); + m_tiles[BottomLeftCorner] = pixmap.copy(0, 16, 8, 8); + m_tiles[BottomSide] = pixmap.copy(8, 16, 8, 8); + m_tiles[BottomRightCorner] = pixmap.copy(16, 16, 8, 8); + } + + void paint(QPainter* p, const QRect& r) + { + p->drawPixmap(r.topLeft(), m_tiles[TopLeftCorner]); + if (r.width() - 16 > 0) { + p->drawTiledPixmap(r.x() + 8, r.y(), r.width() - 16, 8, m_tiles[TopSide]); + } + p->drawPixmap(r.right() - 8 + 1, r.y(), m_tiles[TopRightCorner]); + if (r.height() - 16 > 0) { + p->drawTiledPixmap(r.x(), r.y() + 8, 8, r.height() - 16, m_tiles[LeftSide]); + p->drawTiledPixmap(r.right() - 8 + 1, r.y() + 8, 8, r.height() - 16, m_tiles[RightSide]); + } + p->drawPixmap(r.x(), r.bottom() - 8 + 1, m_tiles[BottomLeftCorner]); + if (r.width() - 16 > 0) { + p->drawTiledPixmap(r.x() + 8, r.bottom() - 8 + 1, r.width() - 16, 8, m_tiles[BottomSide]); + } + p->drawPixmap(r.right() - 8 + 1, r.bottom() - 8 + 1, m_tiles[BottomRightCorner]); + + const QRect contentRect = r.adjusted(LeftMargin + 1, TopMargin + 1, + -(RightMargin + 1), -(BottomMargin + 1)); + p->fillRect(contentRect, Qt::transparent); + } + + QPixmap m_tiles[NumTiles]; + }; +} + +void KPixmapModifier::scale(QPixmap& pixmap, const QSize& scaledSize) +{ + if (scaledSize.isEmpty()) { + pixmap = QPixmap(); + return; + } + +#if defined(Q_WS_X11) && defined(HAVE_XRENDER) + // Assume that the texture size limit is 2048x2048 + if ((pixmap.width() <= 2048) && (pixmap.height() <= 2048) && pixmap.x11PictureHandle()) { + const QPixmap unscaledPixmap = pixmap.copy(); // Make a deep copy for XRender + QSize scaledPixmapSize = pixmap.size(); + scaledPixmapSize.scale(scaledSize, Qt::KeepAspectRatio); + + const qreal factor = scaledPixmapSize.width() / qreal(unscaledPixmap.width()); + + XTransform xform = {{ + { XDoubleToFixed(1 / factor), 0, 0 }, + { 0, XDoubleToFixed(1 / factor), 0 }, + { 0, 0, XDoubleToFixed(1) } + }}; + + QPixmap scaledPixmap(scaledPixmapSize); + scaledPixmap.fill(Qt::transparent); + + Display* dpy = QX11Info::display(); + + XRenderPictureAttributes attr; + attr.repeat = RepeatPad; + XRenderChangePicture(dpy, unscaledPixmap.x11PictureHandle(), CPRepeat, &attr); + + XRenderSetPictureFilter(dpy, unscaledPixmap.x11PictureHandle(), FilterBilinear, 0, 0); + XRenderSetPictureTransform(dpy, unscaledPixmap.x11PictureHandle(), &xform); + XRenderComposite(dpy, PictOpOver, unscaledPixmap.x11PictureHandle(), None, scaledPixmap.x11PictureHandle(), + 0, 0, 0, 0, 0, 0, scaledPixmap.width(), scaledPixmap.height()); + pixmap = scaledPixmap; + } else { + pixmap = pixmap.scaled(scaledSize, Qt::KeepAspectRatio, Qt::SmoothTransformation); + } +#else + pixmap = pixmap.scaled(scaledSize, Qt::KeepAspectRatio, Qt::SmoothTransformation); +#endif +} + +void KPixmapModifier::applyFrame(QPixmap& icon, const QSize& scaledSize) +{ + static TileSet tileSet; + + // Resize the icon to the maximum size minus the space required for the frame + const QSize size(scaledSize.width() - TileSet::LeftMargin - TileSet::RightMargin, + scaledSize.height() - TileSet::TopMargin - TileSet::BottomMargin); + scale(icon, size); + + QPixmap framedIcon(icon.size().width() + TileSet::LeftMargin + TileSet::RightMargin, + icon.size().height() + TileSet::TopMargin + TileSet::BottomMargin); + framedIcon.fill(Qt::transparent); + + QPainter painter; + painter.begin(&framedIcon); + painter.setCompositionMode(QPainter::CompositionMode_Source); + tileSet.paint(&painter, framedIcon.rect()); + painter.setCompositionMode(QPainter::CompositionMode_SourceOver); + painter.drawPixmap(TileSet::LeftMargin, TileSet::TopMargin, icon); + + icon = framedIcon; +} + +QSize KPixmapModifier::sizeInsideFrame(const QSize& frameSize) +{ + return QSize(frameSize.width() - TileSet::LeftMargin - TileSet::RightMargin, + frameSize.height() - TileSet::TopMargin - TileSet::BottomMargin); +} + |