1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
/* $Id$ */
/*
* This file is part of OpenTTD.
* 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.
* 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.
* 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/>.
*/
/** @file 8bpp_base.cpp Implementation of the base for all 8 bpp blitters. */
#include "../stdafx.h"
#include "../gfx_func.h"
#include "8bpp_base.hpp"
void Blitter_8bppBase::DrawColourMappingRect(void *dst, int width, int height, PaletteID pal)
{
const uint8 *ctab = GetNonSprite(pal, ST_RECOLOUR) + 1;
do {
for (int i = 0; i != width; i++) *((uint8 *)dst + i) = ctab[((uint8 *)dst)[i]];
dst = (uint8 *)dst + _screen.pitch;
} while (--height);
}
void *Blitter_8bppBase::MoveTo(const void *video, int x, int y)
{
return (uint8 *)video + x + y * _screen.pitch;
}
void Blitter_8bppBase::SetPixel(void *video, int x, int y, uint8 colour)
{
*((uint8 *)video + x + y * _screen.pitch) = colour;
}
void Blitter_8bppBase::SetPixelIfEmpty(void *video, int x, int y, uint8 colour)
{
uint8 *dst = (uint8 *)video + x + y * _screen.pitch;
if (*dst == 0) *dst = colour;
}
void Blitter_8bppBase::DrawRect(void *video, int width, int height, uint8 colour)
{
do {
memset(video, colour, width);
video = (uint8 *)video + _screen.pitch;
} while (--height);
}
void Blitter_8bppBase::DrawLine(void *video, int x, int y, int x2, int y2, int screen_width, int screen_height, uint8 colour)
{
int dy;
int dx;
int stepx;
int stepy;
int frac;
dy = (y2 - y) * 2;
if (dy < 0) {
dy = -dy;
stepy = -1;
} else {
stepy = 1;
}
dx = (x2 - x) * 2;
if (dx < 0) {
dx = -dx;
stepx = -1;
} else {
stepx = 1;
}
if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, colour);
if (dx > dy) {
frac = dy - (dx / 2);
while (x != x2) {
if (frac >= 0) {
y += stepy;
frac -= dx;
}
x += stepx;
frac += dy;
if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, colour);
}
} else {
frac = dx - (dy / 2);
while (y != y2) {
if (frac >= 0) {
x += stepx;
frac -= dy;
}
y += stepy;
frac += dx;
if (x >= 0 && y >= 0 && x < screen_width && y < screen_height) this->SetPixel(video, x, y, colour);
}
}
}
void Blitter_8bppBase::CopyFromBuffer(void *video, const void *src, int width, int height)
{
uint8 *dst = (uint8 *)video;
uint8 *usrc = (uint8 *)src;
for (; height > 0; height--) {
memcpy(dst, usrc, width * sizeof(uint8));
usrc += width;
dst += _screen.pitch;
}
}
void Blitter_8bppBase::CopyToBuffer(const void *video, void *dst, int width, int height)
{
uint8 *udst = (uint8 *)dst;
uint8 *src = (uint8 *)video;
for (; height > 0; height--) {
memcpy(udst, src, width * sizeof(uint8));
src += _screen.pitch;
udst += width;
}
}
void Blitter_8bppBase::CopyImageToBuffer(const void *video, void *dst, int width, int height, int dst_pitch)
{
uint8 *udst = (uint8 *)dst;
uint8 *src = (uint8 *)video;
for (; height > 0; height--) {
memcpy(udst, src, width * sizeof(uint8));
src += _screen.pitch;
udst += dst_pitch;
}
}
void Blitter_8bppBase::ScrollBuffer(void *video, int &left, int &top, int &width, int &height, int scroll_x, int scroll_y)
{
const uint8 *src;
uint8 *dst;
if (scroll_y > 0) {
/* Calculate pointers */
dst = (uint8 *)video + left + (top + height - 1) * _screen.pitch;
src = dst - scroll_y * _screen.pitch;
/* Decrease height and increase top */
top += scroll_y;
height -= scroll_y;
assert(height > 0);
/* Adjust left & width */
if (scroll_x >= 0) {
dst += scroll_x;
left += scroll_x;
width -= scroll_x;
} else {
src -= scroll_x;
width += scroll_x;
}
for (int h = height; h > 0; h--) {
memcpy(dst, src, width * sizeof(uint8));
src -= _screen.pitch;
dst -= _screen.pitch;
}
} else {
/* Calculate pointers */
dst = (uint8 *)video + left + top * _screen.pitch;
src = dst - scroll_y * _screen.pitch;
/* Decrese height. (scroll_y is <=0). */
height += scroll_y;
assert(height > 0);
/* Adjust left & width */
if (scroll_x >= 0) {
dst += scroll_x;
left += scroll_x;
width -= scroll_x;
} else {
src -= scroll_x;
width += scroll_x;
}
/* the y-displacement may be 0 therefore we have to use memmove,
* because source and destination may overlap */
for (int h = height; h > 0; h--) {
memmove(dst, src, width * sizeof(uint8));
src += _screen.pitch;
dst += _screen.pitch;
}
}
}
int Blitter_8bppBase::BufferSize(int width, int height)
{
return width * height;
}
void Blitter_8bppBase::PaletteAnimate(uint start, uint count)
{
/* Video backend takes care of the palette animation */
}
Blitter::PaletteAnimation Blitter_8bppBase::UsePaletteAnimation()
{
return Blitter::PALETTE_ANIMATION_VIDEO_BACKEND;
}
|
