Mercurial > hg > dmlib

comparison dmunscaledblit.h @ 95:0430f484641b

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add unscaled blitting functions.
author Matti Hamalainen <ccr@tnsp.org>
date Tue, 02 Oct 2012 18:51:16 +0300
parents
children 79dac918c81e
comparison
equal deleted inserted replaced
94:4bbfc0274b29 95:0430f484641b
1 /*
2 * DMLib
3 * -- Unscaled sprite / surface blitting function template
4 * Programmed and designed by Matti 'ccr' Hamalainen
5 * (C) Copyright 2012 Tecnic Software productions (TNSP)
6 */
7
8 int DM_BLITFUNC_NAME (SDL_Surface *src,
9 const int x0, const int y0,
10 SDL_Surface *dst
11 #ifdef DM_BLITFUNC_ARGS
12 DM_BLITFUNC_ARGS
13 #endif
14 )
15 {
16 int yc;
17 DMQValue xr, yr;
18 #ifdef DM_BLITFUNC_VARS
19 DM_BLITFUNC_VARS
20 #endif
21
22 // Clip coordinates
23 if (dmUnscaledClipCoord(&xr, x0, src->w,
24 dst->clip_rect.x, dst->clip_rect.x + dst->clip_rect.w)
25 ||
26 dmUnscaledClipCoord(&yr, y0, src->h,
27 dst->clip_rect.y, dst->clip_rect.y + dst->clip_rect.h))
28 return -1;
29
30 #ifdef DM_BLITFUNC_INIT
31 DM_BLITFUNC_INIT
32 #endif
33 const int srcadd = src->pitch / DM_BLITFUNC_SRC_BYTES;
34 const int dstadd = xr.vadd - dst->clip_rect.w + dst->clip_rect.x + (dst->pitch / DM_BLITFUNC_DST_BYTES);
35
36 DM_BLITFUNC_SRC_TYPE * sp = ((DM_BLITFUNC_SRC_TYPE *) src->pixels) + (yr.voffs * src->pitch) / DM_BLITFUNC_SRC_BYTES;
37 DM_BLITFUNC_DST_TYPE * dp = ((DM_BLITFUNC_DST_TYPE *) dst->pixels) + (yr.v0 * dst->pitch) / DM_BLITFUNC_DST_BYTES + xr.v0;
38
39 for (yc = yr.v0; yc < yr.v1; yc++)
40 {
41 int xv, xc;
42
43 #ifdef DM_BLITFUNC_INNER_INIT
44 DM_BLITFUNC_INNER_INIT
45 #endif
46
47 for (xv = xr.voffs, xc = xr.v0; xc < xr.v1; xc++, xv++)
48 {
49 DM_BLITFUNC_INNER
50 }
51 sp += srcadd;
52 dp += dstadd;
53 }
54
55 #ifdef DM_BLITFUNC_FINISH
56 DM_BLITFUNC_FINISH
57 #endif
58 return 0;
59 }
60
61
62 #undef DM_BLITFUNC_NAME
63 #undef DM_BLITFUNC_ARGS
64 #undef DM_BLITFUNC_SRC_BYTES
65 #undef DM_BLITFUNC_DST_BYTES
66 #undef DM_BLITFUNC_SRC_TYPE
67 #undef DM_BLITFUNC_DST_TYPE
68 #undef DM_BLITFUNC_VARS
69 #undef DM_BLITFUNC_INIT
70 #undef DM_BLITFUNC_INNER_INIT
71 #undef DM_BLITFUNC_INNER
72 #undef DM_BLITFUNC_FINISH