/*
* The ManaPlus Client
* Copyright (C) 2017 The ManaPlus Developers
*
* This file is part of The ManaPlus Client.
*
* This program 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; either version 2 of the License, or
* any later version.
*
* This program 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 this program. If not, see .
*/
/*
SDL_gfxBlitFunc: custom blitters (part of SDL_gfx library)
LGPL (c) A. Schiffler
*/
#ifndef USE_SDL2
#include "resources/sdlgfxblitfunc.h"
#include "utils/checkutils.h"
#include
#include "debug.h"
#define GFX_DUFFS_LOOP4(pixel_copy_increment, width) \
int n = (width + 3) / 4; \
switch (width & 3) \
{ \
case 0: do { \
pixel_copy_increment; \
case 3: pixel_copy_increment; \
case 2: pixel_copy_increment; \
case 1: pixel_copy_increment; \
default: ; \
} while (--n > 0 ); \
}
namespace
{
struct SDL_gfxBlitInfo
{
Uint8 *s_pixels;
int s_width;
int s_height;
int s_skip;
Uint8 *d_pixels;
int d_width;
int d_height;
int d_skip;
void *aux_data;
SDL_PixelFormat *src;
Uint8 *table;
SDL_PixelFormat *dst;
};
static unsigned int GFX_ALPHA_ADJUST_ARRAY[256] =
{
0, /* 0 */
15, /* 1 */
22, /* 2 */
27, /* 3 */
31, /* 4 */
35, /* 5 */
39, /* 6 */
42, /* 7 */
45, /* 8 */
47, /* 9 */
50, /* 10 */
52, /* 11 */
55, /* 12 */
57, /* 13 */
59, /* 14 */
61, /* 15 */
63, /* 16 */
65, /* 17 */
67, /* 18 */
69, /* 19 */
71, /* 20 */
73, /* 21 */
74, /* 22 */
76, /* 23 */
78, /* 24 */
79, /* 25 */
81, /* 26 */
82, /* 27 */
84, /* 28 */
85, /* 29 */
87, /* 30 */
88, /* 31 */
90, /* 32 */
91, /* 33 */
93, /* 34 */
94, /* 35 */
95, /* 36 */
97, /* 37 */
98, /* 38 */
99, /* 39 */
100, /* 40 */
102, /* 41 */
103, /* 42 */
104, /* 43 */
105, /* 44 */
107, /* 45 */
108, /* 46 */
109, /* 47 */
110, /* 48 */
111, /* 49 */
112, /* 50 */
114, /* 51 */
115, /* 52 */
116, /* 53 */
117, /* 54 */
118, /* 55 */
119, /* 56 */
120, /* 57 */
121, /* 58 */
122, /* 59 */
123, /* 60 */
124, /* 61 */
125, /* 62 */
126, /* 63 */
127, /* 64 */
128, /* 65 */
129, /* 66 */
130, /* 67 */
131, /* 68 */
132, /* 69 */
133, /* 70 */
134, /* 71 */
135, /* 72 */
136, /* 73 */
137, /* 74 */
138, /* 75 */
139, /* 76 */
140, /* 77 */
141, /* 78 */
141, /* 79 */
142, /* 80 */
143, /* 81 */
144, /* 82 */
145, /* 83 */
146, /* 84 */
147, /* 85 */
148, /* 86 */
148, /* 87 */
149, /* 88 */
150, /* 89 */
151, /* 90 */
152, /* 91 */
153, /* 92 */
153, /* 93 */
154, /* 94 */
155, /* 95 */
156, /* 96 */
157, /* 97 */
158, /* 98 */
158, /* 99 */
159, /* 100 */
160, /* 101 */
161, /* 102 */
162, /* 103 */
162, /* 104 */
163, /* 105 */
164, /* 106 */
165, /* 107 */
165, /* 108 */
166, /* 109 */
167, /* 110 */
168, /* 111 */
168, /* 112 */
169, /* 113 */
170, /* 114 */
171, /* 115 */
171, /* 116 */
172, /* 117 */
173, /* 118 */
174, /* 119 */
174, /* 120 */
175, /* 121 */
176, /* 122 */
177, /* 123 */
177, /* 124 */
178, /* 125 */
179, /* 126 */
179, /* 127 */
180, /* 128 */
181, /* 129 */
182, /* 130 */
182, /* 131 */
183, /* 132 */
184, /* 133 */
184, /* 134 */
185, /* 135 */
186, /* 136 */
186, /* 137 */
187, /* 138 */
188, /* 139 */
188, /* 140 */
189, /* 141 */
190, /* 142 */
190, /* 143 */
191, /* 144 */
192, /* 145 */
192, /* 146 */
193, /* 147 */
194, /* 148 */
194, /* 149 */
195, /* 150 */
196, /* 151 */
196, /* 152 */
197, /* 153 */
198, /* 154 */
198, /* 155 */
199, /* 156 */
200, /* 157 */
200, /* 158 */
201, /* 159 */
201, /* 160 */
202, /* 161 */
203, /* 162 */
203, /* 163 */
204, /* 164 */
205, /* 165 */
205, /* 166 */
206, /* 167 */
206, /* 168 */
207, /* 169 */
208, /* 170 */
208, /* 171 */
209, /* 172 */
210, /* 173 */
210, /* 174 */
211, /* 175 */
211, /* 176 */
212, /* 177 */
213, /* 178 */
213, /* 179 */
214, /* 180 */
214, /* 181 */
215, /* 182 */
216, /* 183 */
216, /* 184 */
217, /* 185 */
217, /* 186 */
218, /* 187 */
218, /* 188 */
219, /* 189 */
220, /* 190 */
220, /* 191 */
221, /* 192 */
221, /* 193 */
222, /* 194 */
222, /* 195 */
223, /* 196 */
224, /* 197 */
224, /* 198 */
225, /* 199 */
225, /* 200 */
226, /* 201 */
226, /* 202 */
227, /* 203 */
228, /* 204 */
228, /* 205 */
229, /* 206 */
229, /* 207 */
230, /* 208 */
230, /* 209 */
231, /* 210 */
231, /* 211 */
232, /* 212 */
233, /* 213 */
233, /* 214 */
234, /* 215 */
234, /* 216 */
235, /* 217 */
235, /* 218 */
236, /* 219 */
236, /* 220 */
237, /* 221 */
237, /* 222 */
238, /* 223 */
238, /* 224 */
239, /* 225 */
240, /* 226 */
240, /* 227 */
241, /* 228 */
241, /* 229 */
242, /* 230 */
242, /* 231 */
243, /* 232 */
243, /* 233 */
244, /* 234 */
244, /* 235 */
245, /* 236 */
245, /* 237 */
246, /* 238 */
246, /* 239 */
247, /* 240 */
247, /* 241 */
248, /* 242 */
248, /* 243 */
249, /* 244 */
249, /* 245 */
250, /* 246 */
250, /* 247 */
251, /* 248 */
251, /* 249 */
252, /* 250 */
252, /* 251 */
253, /* 252 */
253, /* 253 */
254, /* 254 */
255 /* 255 */
};
}
static void _SDL_gfxBlitBlitterRGBA(SDL_gfxBlitInfo *info)
{
const int width = info->d_width;
int height = info->d_height;
Uint8 *src = info->s_pixels;
const int srcskip = info->s_skip;
Uint8 *dst = info->d_pixels;
const int dstskip = info->d_skip;
SDL_PixelFormat *srcfmt = info->src;
while (height--)
{
GFX_DUFFS_LOOP4(
{
Uint32 pixel;
uint32_t sR;
uint32_t sG;
uint32_t sB;
uint32_t sA;
uint32_t dR;
uint32_t dG;
uint32_t dB;
uint32_t dA;
uint32_t sAA;
pixel = *(reinterpret_cast(src));
sR = ((pixel & srcfmt->Rmask) >> srcfmt->Rshift);
sG = ((pixel & srcfmt->Gmask) >> srcfmt->Gshift);
sB = ((pixel & srcfmt->Bmask) >> srcfmt->Bshift);
sA = ((pixel & srcfmt->Amask) >> srcfmt->Ashift);
pixel = *(reinterpret_cast(dst));
dR = pixel & 0xff;
dG = ((pixel & 0xff00) >> 8);
dB = ((pixel & 0xff0000) >> 16);
dA = ((pixel & 0xff000000) >> 24);
sAA = GFX_ALPHA_ADJUST_ARRAY[sA & 255];
dR = (((sR - dR) * (sAA)) / 255) + dR;
dG = (((sG - dG) * (sAA)) / 255) + dG;
dB = (((sB - dB) * (sAA)) / 255) + dB;
dA |= sAA;
*(reinterpret_cast(dst)) = dR |
(dG << 8) |
(dB << 16) |
(dA << 24);
src += 4;
dst += 4;
}, width);
src += srcskip;
dst += dstskip;
}
}
static int _SDL_gfxBlitRGBACall(SDL_Surface *const src,
SDL_Rect *const srcrect,
SDL_Surface *const dst,
SDL_Rect *const dstrect)
{
/*
* Set up source and destination buffer pointers, then blit
*/
if (srcrect->w && srcrect->h)
{
SDL_gfxBlitInfo info;
/*
* Set up the blit information
*/
info.s_pixels = static_cast(src->pixels) + src->offset +
static_cast(srcrect->y) * src->pitch +
static_cast(srcrect->x) * src->format->BytesPerPixel;
info.s_width = srcrect->w;
info.s_height = srcrect->h;
info.s_skip = CAST_S32(src->pitch - info.s_width *
src->format->BytesPerPixel);
info.d_pixels = static_cast(dst->pixels) + dst->offset +
static_cast(dstrect->y) * dst->pitch +
static_cast(dstrect->x) * dst->format->BytesPerPixel;
info.d_width = dstrect->w;
info.d_height = dstrect->h;
info.d_skip = CAST_S32(dst->pitch - info.d_width *
dst->format->BytesPerPixel);
info.aux_data = nullptr;
info.src = src->format;
info.table = nullptr;
info.dst = dst->format;
/*
* Run the actual software blitter
*/
_SDL_gfxBlitBlitterRGBA(&info);
return 1;
}
return (0);
}
int SDLgfxBlitRGBA(SDL_Surface *const src,
SDL_Rect *const srcrect,
SDL_Surface *const dst,
SDL_Rect *const dstrect)
{
SDL_Rect sr;
SDL_Rect dr;
int srcx;
int srcy;
int w;
int h;
/*
* Make sure the surfaces aren't locked
*/
if (!src || !dst)
{
reportAlways("SDLgfxBlitRGBA: passed a NULL surface");
return -1;
}
/*
* If the destination rectangle is NULL, use the entire dest surface
*/
if (dstrect == nullptr)
{
dr.x = 0;
dr.y = 0;
dr.w = CAST_U16(dst->w);
dr.h = CAST_U16(dst->h);
}
else
{
dr = *dstrect;
}
/*
* Clip the source rectangle to the source surface
*/
if (srcrect)
{
int maxw;
int maxh;
srcx = srcrect->x;
w = srcrect->w;
maxw = src->w - srcx;
if (maxw < w)
w = maxw;
srcy = srcrect->y;
h = srcrect->h;
maxh = src->h - srcy;
if (maxh < h)
h = maxh;
}
else
{
srcx = 0;
srcy = 0;
w = src->w;
h = src->h;
}
/*
* Clip the destination rectangle against the clip rectangle
*/
SDL_Rect *clip = &dst->clip_rect;
int dx;
int dy;
dx = clip->x - dr.x;
if (dx > 0)
{
w -= dx;
dr.x += dx;
srcx += CAST_S16(dx);
}
dx = dr.x + w - clip->x - clip->w;
if (dx > 0)
w -= dx;
dy = clip->y - dr.y;
if (dy > 0)
{
h -= dy;
dr.y += dy;
srcy += CAST_S16(dy);
}
dy = dr.y + h - clip->y - clip->h;
if (dy > 0)
h -= dy;
if (w > 0 && h > 0)
{
sr.x = CAST_S16(srcx);
sr.y = CAST_S16(srcy);
sr.w = dr.w = CAST_U16(w);
sr.h = dr.h = CAST_U16(h);
return _SDL_gfxBlitRGBACall(src, &sr, dst, &dr);
}
return 0;
}
#endif // USE_SDL2