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
25 #include "pixmapplane.h"
26
27 #include <QPainter>
28
29 namespace khtmlImLoad
30 {
31
paint(int dx,int dy,QPainter * p,int sx,int sy,int sWidth,int sHeight)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
flushCache()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
147