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Add palette extraction functions

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karri
2022-12-30 14:44:18 +02:00
parent ebd1381030
commit 4117e94ed5
5 changed files with 391 additions and 5 deletions
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src/sp65/lynxpalette.c Normal file
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/*****************************************************************************/
/* */
/* lynxpalette.c */
/* */
/* Lynx palette backend for the sp65 sprite and bitmap utility */
/* */
/* */
/* */
/* (C) 2022, Karri Kaksonen */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#include <stdlib.h>
/* common */
#include "attrib.h"
#include "print.h"
/* sp65 */
#include "attr.h"
#include "error.h"
#include "palette.h"
#include "lynxpalette.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
/*****************************************************************************/
/* Code */
/*****************************************************************************/
StrBuf* GenLynxPalette (const Bitmap* B, const Collection* A)
/* Generate binary output in Lynx palette format for the bitmap B. The output
** is stored in a string buffer (which is actually a dynamic char array) and
** returned.
**
*/
{
StrBuf* D;
Palette* P;
unsigned I;
P = GetBitmapPalette (B);
D = NewStrBuf ();
for (I = 0; I < 16; ++I) {
/* Get the color entry */
const Color* C = P->Entries + I;
/* Add the green component */
SB_AppendChar (D, C->G >> 4);
}
for (I = 0; I < 16; ++I) {
/* Get the color entry */
const Color* C = P->Entries + I;
/* Add the blue,red component */
SB_AppendChar (D, (C->B & 0xF0) | (C->R >> 4));
}
/* Return the converted palette */
return D;
}