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[cc65] / src / sp65 / vic2sprite.c
1 /*****************************************************************************/
2 /*                                                                           */
3 /*                               vic2sprite.c                                */
4 /*                                                                           */
5 /*    VICII sprite format backend for the sp65 sprite and bitmap utility     */
6 /*                                                                           */
7 /*                                                                           */
8 /*                                                                           */
9 /* (C) 2012,      Ullrich von Bassewitz                                      */
10 /*                Roemerstrasse 52                                           */
11 /*                D-70794 Filderstadt                                        */
12 /* EMail:         uz@cc65.org                                                */
13 /*                                                                           */
14 /*                                                                           */
15 /* This software is provided 'as-is', without any expressed or implied       */
16 /* warranty.  In no event will the authors be held liable for any damages    */
17 /* arising from the use of this software.                                    */
18 /*                                                                           */
19 /* Permission is granted to anyone to use this software for any purpose,     */
20 /* including commercial applications, and to alter it and redistribute it    */
21 /* freely, subject to the following restrictions:                            */
22 /*                                                                           */
23 /* 1. The origin of this software must not be misrepresented; you must not   */
24 /*    claim that you wrote the original software. If you use this software   */
25 /*    in a product, an acknowledgment in the product documentation would be  */
26 /*    appreciated but is not required.                                       */
27 /* 2. Altered source versions must be plainly marked as such, and must not   */
28 /*    be misrepresented as being the original software.                      */
29 /* 3. This notice may not be removed or altered from any source              */
30 /*    distribution.                                                          */
31 /*                                                                           */
32 /*****************************************************************************/
33
34
35
36 /* common */
37 #include "attrib.h"
38
39 /* sp65 */
40 #include "error.h"
41 #include "vic2sprite.h"
42
43
44
45 /*****************************************************************************/
46 /*                                   Data                                    */
47 /*****************************************************************************/
48
49
50
51 /* Screen size of a koala picture */
52 #define WIDTH   24U
53 #define HEIGHT  21U
54
55
56
57 /*****************************************************************************/
58 /*                                   Code                                    */
59 /*****************************************************************************/
60
61
62
63 StrBuf* GenVic2Sprite (const Bitmap* B, const Collection* A attribute ((unused)))
64 /* Generate binary output in VICII sprite format for the bitmap B. The output
65  * is stored in a string buffer (which is actually a dynamic char array) and
66  * returned.
67  */
68 {
69     StrBuf* D;
70     unsigned X, Y;
71
72     /* Sprites pictures are always 24x21 in size with 2 colors */
73     if (GetBitmapType (B)   != bmIndexed ||
74         GetBitmapColors (B) != 2         ||
75         GetBitmapHeight (B) != HEIGHT    ||
76         GetBitmapWidth (B)  != WIDTH) {
77                                                         
78         printf ("w = %u, h = %u\n", GetBitmapWidth (B), GetBitmapHeight (B));
79         Error ("Bitmaps converted to vic2 sprite format must be in indexed "
80                "mode with a size of %ux%u and two colors", WIDTH, HEIGHT);
81     }
82
83     /* Create the output buffer and resize it to the required size. */
84     D = NewStrBuf ();
85     SB_Realloc (D, 63);
86
87     /* Convert the image */
88     for (Y = 0; Y < HEIGHT; ++Y) {
89         unsigned char V = 0;
90         for (X = 0; X < WIDTH; ++X) {
91
92             /* Fetch next bit into byte buffer */
93             V = (V << 1) | (GetPixel (B, X, Y).Index != 0);
94
95             /* Store full bytes into the output buffer */
96             if ((X & 0x07) == 0x07) {
97                 SB_AppendChar (D, V);
98                 V = 0;
99             }
100         }
101     }
102
103     /* Return the converted bitmap */
104     return D;
105 }
106
107
108