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Add lynx sprite generation skeleton
git-svn-id: svn://svn.cc65.org/cc65/trunk@5609 b7a2c559-68d2-44c3-8de9-860c34a00d81
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karri
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167
src/sp65/lynxsprite.c
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167
src/sp65/lynxsprite.c
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/*****************************************************************************/
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/* */
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/* lynxsprite.c */
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/* */
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/* Lynx 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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#include "print.h"
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/* sp65 */
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#include "attr.h"
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#include "error.h"
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#include "lynxsprite.h"
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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/* Sprite mode */
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enum Mode {
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smAuto,
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smLiteral,
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smPacked
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};
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/* Screen size of a koala picture */
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#define WIDTH_HR 24U
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#define WIDTH_MC 12U
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#define HEIGHT 21U
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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static enum Mode GetMode (const Collection* A)
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/* Return the sprite mode from the attribute collection A */
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{
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/* Check for a mode attribute */
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const char* Mode = GetAttrVal (A, "mode");
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if (Mode) {
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if (strcmp (Mode, "literal") == 0) {
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return smLiteral;
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} else if (strcmp (Mode, "packed") == 0) {
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return smPacked;
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} else {
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Error ("Invalid value for attribute `mode'");
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}
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} else {
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return smAuto;
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}
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}
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StrBuf* GenLynxSprite (const Bitmap* B, const Collection* A)
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/* Generate binary output in Lynx 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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enum Mode M;
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StrBuf* D;
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unsigned X, Y;
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/* Output the image properties */
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Print (stdout, 1, "Image is %ux%u with %u colors%s\n",
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GetBitmapWidth (B), GetBitmapHeight (B), GetBitmapColors (B),
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BitmapIsIndexed (B)? " (indexed)" : "");
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/* Get the sprite mode */
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M = GetMode (A);
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/* Check the height of the bitmap */
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if (GetBitmapHeight (B) != HEIGHT) {
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Error ("Invalid bitmap height (%u) for conversion to vic2 sprite",
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GetBitmapHeight (B));
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}
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/* If the mode wasn't given, fallback to packed */
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if (M == smAuto) {
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M = smPacked;
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}
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/* Now check if bitmap indexes are ok */
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if (GetBitmapColors (B) > 16) {
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Error ("Too many colors for a Lynx sprite");
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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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if (M == smLiteral) {
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for (X = 0; X < WIDTH_HR; ++X) {
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/* Fetch next bit into byte buffer */
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V = (V << 1) | (GetPixel (B, X, Y).Index & 0x01);
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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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} else {
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for (X = 0; X < WIDTH_MC; ++X) {
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/* Fetch next bit into byte buffer */
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V = (V << 2) | (GetPixel (B, X, Y).Index & 0x03);
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/* Store full bytes into the output buffer */
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if ((X & 0x03) == 0x03) {
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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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}
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/* Return the converted bitmap */
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return D;
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}
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69
src/sp65/lynxsprite.h
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69
src/sp65/lynxsprite.h
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@ -0,0 +1,69 @@
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/*****************************************************************************/
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/* */
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/* lynxsprite.h */
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/* */
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/* Lynx 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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#ifndef LYNXSPRITE_H
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#define LYNXSPRITE_H
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/* common */
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#include "coll.h"
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#include "strbuf.h"
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/* sp65 */
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#include "bitmap.h"
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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StrBuf* GenLynxSprite (const Bitmap* B, const Collection* A);
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/* Generate binary output in packed Lynx 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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/* End of lynxsprite.h */
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#endif
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@ -33,6 +33,7 @@ OBJS = asm.o \
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fileio.o \
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input.o \
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koala.o \
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lynxsprite.o \
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main.o \
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output.o \
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palette.o \
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@ -71,6 +71,7 @@ OBJS = asm.obj \
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fileio.obj \
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input.obj \
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koala.obj \
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lynxsprite.obj \
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main.obj \
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output.obj \
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palette.obj \
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