OpenTTD
8bpp_base.cpp
Go to the documentation of this file.
1 /* $Id: 8bpp_base.cpp 26482 2014-04-23 20:13:33Z rubidium $ */
2 
3 /*
4  * This file is part of OpenTTD.
5  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
6  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
7  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
8  */
9 
12 #include "../stdafx.h"
13 #include "../gfx_func.h"
14 #include "8bpp_base.hpp"
15 
16 #include "../safeguards.h"
17 
18 void Blitter_8bppBase::DrawColourMappingRect(void *dst, int width, int height, PaletteID pal)
19 {
20  const uint8 *ctab = GetNonSprite(pal, ST_RECOLOUR) + 1;
21 
22  do {
23  for (int i = 0; i != width; i++) *((uint8 *)dst + i) = ctab[((uint8 *)dst)[i]];
24  dst = (uint8 *)dst + _screen.pitch;
25  } while (--height);
26 }
27 
28 void *Blitter_8bppBase::MoveTo(void *video, int x, int y)
29 {
30  return (uint8 *)video + x + y * _screen.pitch;
31 }
32 
33 void Blitter_8bppBase::SetPixel(void *video, int x, int y, uint8 colour)
34 {
35  *((uint8 *)video + x + y * _screen.pitch) = colour;
36 }
37 
38 void Blitter_8bppBase::DrawRect(void *video, int width, int height, uint8 colour)
39 {
40  do {
41  memset(video, colour, width);
42  video = (uint8 *)video + _screen.pitch;
43  } while (--height);
44 }
45 
46 void Blitter_8bppBase::CopyFromBuffer(void *video, const void *src, int width, int height)
47 {
48  uint8 *dst = (uint8 *)video;
49  const uint8 *usrc = (const uint8 *)src;
50 
51  for (; height > 0; height--) {
52  memcpy(dst, usrc, width * sizeof(uint8));
53  usrc += width;
54  dst += _screen.pitch;
55  }
56 }
57 
58 void Blitter_8bppBase::CopyToBuffer(const void *video, void *dst, int width, int height)
59 {
60  uint8 *udst = (uint8 *)dst;
61  const uint8 *src = (const uint8 *)video;
62 
63  for (; height > 0; height--) {
64  memcpy(udst, src, width * sizeof(uint8));
65  src += _screen.pitch;
66  udst += width;
67  }
68 }
69 
70 void Blitter_8bppBase::CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)
71 {
72  uint8 *udst = (uint8 *)dst;
73  const uint8 *src = (const uint8 *)video;
74 
75  for (; height > 0; height--) {
76  memcpy(udst, src, width * sizeof(uint8));
77  src += _screen.pitch;
78  udst += dst_pitch;
79  }
80 }
81 
82 void Blitter_8bppBase::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)
83 {
84  const uint8 *src;
85  uint8 *dst;
86 
87  if (scroll_y > 0) {
88  /* Calculate pointers */
89  dst = (uint8 *)video + left + (top + height - 1) * _screen.pitch;
90  src = dst - scroll_y * _screen.pitch;
91 
92  /* Decrease height and increase top */
93  top += scroll_y;
94  height -= scroll_y;
95  assert(height > 0);
96 
97  /* Adjust left & width */
98  if (scroll_x >= 0) {
99  dst += scroll_x;
100  left += scroll_x;
101  width -= scroll_x;
102  } else {
103  src -= scroll_x;
104  width += scroll_x;
105  }
106 
107  for (int h = height; h > 0; h--) {
108  memcpy(dst, src, width * sizeof(uint8));
109  src -= _screen.pitch;
110  dst -= _screen.pitch;
111  }
112  } else {
113  /* Calculate pointers */
114  dst = (uint8 *)video + left + top * _screen.pitch;
115  src = dst - scroll_y * _screen.pitch;
116 
117  /* Decrease height. (scroll_y is <=0). */
118  height += scroll_y;
119  assert(height > 0);
120 
121  /* Adjust left & width */
122  if (scroll_x >= 0) {
123  dst += scroll_x;
124  left += scroll_x;
125  width -= scroll_x;
126  } else {
127  src -= scroll_x;
128  width += scroll_x;
129  }
130 
131  /* the y-displacement may be 0 therefore we have to use memmove,
132  * because source and destination may overlap */
133  for (int h = height; h > 0; h--) {
134  memmove(dst, src, width * sizeof(uint8));
135  src += _screen.pitch;
136  dst += _screen.pitch;
137  }
138  }
139 }
140 
141 int Blitter_8bppBase::BufferSize(int width, int height)
142 {
143  return width * height;
144 }
145 
147 {
148  /* Video backend takes care of the palette animation */
149 }
150 
152 {
154 }