khtml/imload/scaledimageplane.cpp

   1 /*
   2     Large image displaying library.
   3
   4     Copyright (C) 2004,2005 Maks Orlovich (maksim@kde.org)
   5
   6     Permission is hereby granted, free of charge, to any person obtaining a copy
   7     of this software and associated documentation files (the "Software"), to deal
   8     in the Software without restriction, including without limitation the rights
   9     to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10     copies of the Software, and to permit persons to whom the Software is
  11     furnished to do so, subject to the following conditions:
  12
  13     The above copyright notice and this permission notice shall be included in
  14     all copies or substantial portions of the Software.
  15
  16     THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17     IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18     FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  19     AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  20     AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21     CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  22
  23 */
  24 #include "scaledimageplane.h"
  25 #include "imagemanager.h"
  26
  27 namespace khtmlImLoad {
  28
  29 bool ScaledImagePlane::isUpToDate(unsigned int tileX, unsigned int tileY,
  30                             PixmapTile* tile)
  31 {
  32     if (!tile->pixmap) return false;
  33
  34     for (unsigned int line = 0; line < tileHeight(tileY); ++line)
  35     {
  36         if (tile->versions[line] < parent->versions[yScaleTable[line + tileY*Tile::TileSize]])
  37             return false;
  38     }
  39
  40     return true;
  41 }
  42
  43 template<typename T>
  44 static void scaleLoop(QImage* dst, unsigned int* xScaleTable,
  45                       int line, const QImage& src, int srcLine, int tileX, int tileY)
  46 {
  47     const T* srcPix = reinterpret_cast<const T*>(src.scanLine (srcLine));
  48     T*       dstPix = reinterpret_cast<T*>(dst->scanLine(line));
  49
  50     xScaleTable += tileX * Tile::TileSize;
  51     for (int x = 0; x < (int)dst->width(); ++x)
  52     {
  53         *dstPix = srcPix[xScaleTable[x]];
  54         ++dstPix;
  55     }
  56 }
  57 //### is special version for TileSize worth it?
  58
  59 void ScaledImagePlane::flushCache()
  60 {
  61     for (unsigned tileX = 0; tileX < tilesWidth; ++tileX) {
  62         for (unsigned tileY = 0; tileY < tilesHeight; ++tileY) {
  63             ImageTile& imageTile = tiles.at(tileX, tileY);
  64             if (!imageTile.image.isNull())
  65                 ImageManager::imageCache()->removeEntry(&imageTile);
  66         }
  67     }
  68 }
  69
  70 void ScaledImagePlane::ensureUpToDate(unsigned int tileX, unsigned int tileY,
  71                             PixmapTile* tile)
  72 {
  73     ImageTile& imageTile = tiles.at(tileX, tileY);
  74
  75     //Create the image if need be.
  76     if (imageTile.image.isNull())
  77     {
  78         imageTile.image = parent->format.makeImage(tileWidth (tileX),
  79                                                    tileHeight(tileY));
  80         ImageManager::imageCache()->addEntry(&imageTile);
  81         std::memset(imageTile.versions, 0, Tile::TileSize);
  82     }
  83     else ImageManager::imageCache()->touchEntry(&imageTile);
  84
  85     //Pull in updates to the image.
  86     for (unsigned int line = 0; line < tileHeight(tileY); ++line)
  87     {
  88         int origLine = yScaleTable[line + tileY*Tile::TileSize];
  89         if (imageTile.versions[line] < parent->versions[origLine])
  90         {
  91             imageTile.versions[line] = parent->versions[origLine];
  92             if (parent->format.depth() == 1)
  93                 scaleLoop<quint8>(&imageTile.image, xScaleTable, line,
  94                                 parent->image, origLine, tileX, tileY);
  95             else
  96                 scaleLoop<quint32>(&imageTile.image, xScaleTable, line,
  97                                 parent->image, origLine, tileX, tileY);
  98         }
  99     }
 100
 101     //Now, push stuff into the pixmap.
 102     updatePixmap(tile, imageTile.image, tileX, tileY, 0, 0, imageTile.versions);
 103 }
 104
 105 ScaledImagePlane::~ScaledImagePlane()
 106 {
 107     delete[] xScaleTable;
 108     delete[] yScaleTable;
 109 }
 110
 111
 112 }
 113
 114 // kate: indent-width 4; replace-tabs on; tab-width 4; space-indent on;