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109 lines
4.5 KiB
C
109 lines
4.5 KiB
C
/*****************************************************************************/
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/* */
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/* vic2sprite.c */
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/* */
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/* VICII sprite format backend for the sp65 sprite and bitmap utility */
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/* */
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/* */
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/* */
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/* (C) 2012, Ullrich von Bassewitz */
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/* Roemerstrasse 52 */
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/* D-70794 Filderstadt */
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/* EMail: uz@cc65.org */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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/* common */
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#include "attrib.h"
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/* sp65 */
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#include "error.h"
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#include "vic2sprite.h"
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Screen size of a koala picture */
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#define WIDTH 24U
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#define HEIGHT 21U
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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StrBuf* GenVic2Sprite (const Bitmap* B, const Collection* A attribute ((unused)))
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/* Generate binary output in VICII sprite format for the bitmap B. The output
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* is stored in a string buffer (which is actually a dynamic char array) and
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* returned.
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*/
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{
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StrBuf* D;
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unsigned X, Y;
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/* Sprites pictures are always 24x21 in size with 2 colors */
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if (GetBitmapType (B) != bmIndexed ||
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GetBitmapColors (B) != 2 ||
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GetBitmapHeight (B) != HEIGHT ||
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GetBitmapWidth (B) != WIDTH) {
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printf ("w = %u, h = %u\n", GetBitmapWidth (B), GetBitmapHeight (B));
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Error ("Bitmaps converted to vic2 sprite format must be in indexed "
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"mode with a size of %ux%u and two colors", WIDTH, HEIGHT);
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}
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/* Create the output buffer and resize it to the required size. */
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D = NewStrBuf ();
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SB_Realloc (D, 63);
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/* Convert the image */
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for (Y = 0; Y < HEIGHT; ++Y) {
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unsigned char V = 0;
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for (X = 0; X < WIDTH; ++X) {
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/* Fetch next bit into byte buffer */
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V = (V << 1) | (GetPixel (B, X, Y).Index != 0);
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/* Store full bytes into the output buffer */
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if ((X & 0x07) == 0x07) {
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SB_AppendChar (D, V);
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V = 0;
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}
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}
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}
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/* Return the converted bitmap */
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return D;
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}
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