KHtml

pixmapplane.cpp
1 /*
2  Large image displaying library.
3 
4  Copyright (C) 2004,2005 Maks Orlovich ([email protected])
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 
25 #include "pixmapplane.h"
26 
27 #include <QPainter>
28 
29 namespace khtmlImLoad
30 {
31 
32 void PixmapPlane::paint(int dx, int dy, QPainter *p,
33  int sx, int sy, int sWidth, int sHeight)
34 {
35  //Do some basic clipping, discarding invalid requests and adjusting sizes of others.
36  if (sy >= (int)height) {
37  return;
38  }
39  if (sx >= (int)width) {
40  return;
41  }
42 
43  if (sWidth == -1) {
44  sWidth = width;
45  }
46 
47  if (sHeight == -1) {
48  sHeight = height;
49  }
50 
51  unsigned int ey = sy + sHeight - 1;
52  if (ey > height - 1) {
53  ey = height - 1;
54  }
55 
56  unsigned int ex = sx + sWidth - 1;
57  if (ex > width - 1) {
58  ex = width - 1;
59  }
60 
61  sHeight = ey - sy + 1;
62  sWidth = ex - sx + 1;
63 
64  //Calculate the range of tiles to paint, in both directions
65  unsigned int startTileY = sy / Tile::TileSize;
66  unsigned int endTileY = ey / Tile::TileSize;
67 
68  unsigned int startTileX = sx / Tile::TileSize;
69  unsigned int endTileX = ex / Tile::TileSize;
70 
71  //Walk through all the rows
72  unsigned int paintY = dy;
73  for (unsigned int tileY = startTileY; tileY <= endTileY; ++tileY) {
74  //see how much we have to paint -- end points are different
75  unsigned int startY = 0;
76  unsigned int endY = Tile::TileSize - 1;
77 
78  if (tileY == startTileY) {
79  startY = sy % Tile::TileSize;
80  }
81 
82  if (tileY == endTileY) {
83  endY = ey % Tile::TileSize;
84  }
85 
86  unsigned int paintHeight = endY - startY + 1;
87 
88  //Now through some columns
89  unsigned int paintX = dx;
90  for (unsigned int tileX = startTileX; tileX <= endTileX; ++tileX) {
91  //calculate the horizontal size. Some redundancy here,
92  //since these are the same for all rows, but I'd rather
93  //avoid heap allocation or alloca..
94  unsigned int startX = 0;
95  unsigned int endX = Tile::TileSize - 1;
96 
97  if (tileX == startTileX) {
98  startX = sx % Tile::TileSize;
99  }
100 
101  if (tileX == endTileX) {
102  endX = ex % Tile::TileSize;
103  }
104 
105  int paintWidth = endX - startX + 1;
106 
107  //Update from image plane if need be
108  PixmapTile &tile = tiles.at(tileX, tileY);
109  if (!parent->isUpToDate(tileX, tileY, &tile)) {
110  parent->ensureUpToDate(tileX, tileY, &tile);
111  }
112 
113  //Draw as much as we have
114  if (tile.pixmap) {
115  //Scan the versions to see how much to paint.
116  unsigned int h = 0;
117  for (int checkY = startY; checkY < Tile::TileSize && tile.versions[checkY]; ++checkY) {
118  ++h;
119  }
120 
121  //Draw it, if there is anything (note: Qt would interpret 0 as everything)
122  if (h)
123  p->drawPixmap(paintX, paintY, *tile.pixmap, startX, startY,
124  paintWidth, qMin(h, paintHeight));
125  }
126  paintX += paintWidth;
127  }
128  paintY += paintHeight;
129  }
130 }
131 
132 void PixmapPlane::flushCache()
133 {
134  parent->flushCache();
135  for (unsigned tileX = 0; tileX < tilesWidth; ++tileX) {
136  for (unsigned tileY = 0; tileY < tilesHeight; ++tileY) {
137  PixmapTile &pixTile = tiles.at(tileX, tileY);
138  if (pixTile.pixmap) {
139  ImageManager::pixmapCache()->removeEntry(&pixTile);
140  }
141  }
142  }
143 }
144 
145 }
146 
virtual bool isUpToDate(unsigned int tileX, unsigned int tileY, PixmapTile *tile)=0
Returns true if the given pixmap tile is up-to-date.
void drawPixmap(const QRectF &target, const QPixmap &pixmap, const QRectF &source)
void paint(int dx, int dy, QPainter *p, int sx, int sy, int width=-1, int height=-1)
Paints a portion of the frame on the painter &#39;p&#39; at dx and dy.
Definition: pixmapplane.cpp:32
virtual void ensureUpToDate(unsigned int tileX, unsigned int tileY, PixmapTile *tile)=0
Ensures that the given pixmap tile is up-to-date.
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