--- /dev/null
+/*****************************************************************************/
+/* */
+/* lynxsprite.c */
+/* */
+/* Lynx sprite format backend for the sp65 sprite and bitmap utility */
+/* */
+/* */
+/* */
+/* (C) 2012, Ullrich von Bassewitz */
+/* Roemerstrasse 52 */
+/* D-70794 Filderstadt */
+/* EMail: uz@cc65.org */
+/* */
+/* */
+/* 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. */
+/* */
+/*****************************************************************************/
+
+
+
+/* common */
+#include "attrib.h"
+#include "print.h"
+
+/* sp65 */
+#include "attr.h"
+#include "error.h"
+#include "lynxsprite.h"
+
+
+
+/*****************************************************************************/
+/* Data */
+/*****************************************************************************/
+
+
+
+/* Sprite mode */
+enum Mode {
+ smAuto,
+ smLiteral,
+ smPacked
+};
+
+/* Screen size of a koala picture */
+#define WIDTH_HR 24U
+#define WIDTH_MC 12U
+#define HEIGHT 21U
+
+
+
+/*****************************************************************************/
+/* Code */
+/*****************************************************************************/
+
+
+
+static enum Mode GetMode (const Collection* A)
+/* Return the sprite mode from the attribute collection A */
+{
+ /* Check for a mode attribute */
+ const char* Mode = GetAttrVal (A, "mode");
+ if (Mode) {
+ if (strcmp (Mode, "literal") == 0) {
+ return smLiteral;
+ } else if (strcmp (Mode, "packed") == 0) {
+ return smPacked;
+ } else {
+ Error ("Invalid value for attribute `mode'");
+ }
+ } else {
+ return smAuto;
+ }
+}
+
+
+
+StrBuf* GenLynxSprite (const Bitmap* B, const Collection* A)
+/* Generate binary output in Lynx sprite format for the bitmap B. The output
+ * is stored in a string buffer (which is actually a dynamic char array) and
+ * returned.
+ */
+{
+ enum Mode M;
+ StrBuf* D;
+ unsigned X, Y;
+
+
+ /* Output the image properties */
+ Print (stdout, 1, "Image is %ux%u with %u colors%s\n",
+ GetBitmapWidth (B), GetBitmapHeight (B), GetBitmapColors (B),
+ BitmapIsIndexed (B)? " (indexed)" : "");
+
+ /* Get the sprite mode */
+ M = GetMode (A);
+
+ /* Check the height of the bitmap */
+ if (GetBitmapHeight (B) != HEIGHT) {
+ Error ("Invalid bitmap height (%u) for conversion to vic2 sprite",
+ GetBitmapHeight (B));
+ }
+
+ /* If the mode wasn't given, fallback to packed */
+ if (M == smAuto) {
+ M = smPacked;
+ }
+
+ /* Now check if bitmap indexes are ok */
+ if (GetBitmapColors (B) > 16) {
+ Error ("Too many colors for a Lynx sprite");
+ }
+
+ /* Create the output buffer and resize it to the required size. */
+ D = NewStrBuf ();
+ SB_Realloc (D, 63);
+
+ /* Convert the image */
+ for (Y = 0; Y < HEIGHT; ++Y) {
+ unsigned char V = 0;
+ if (M == smLiteral) {
+ for (X = 0; X < WIDTH_HR; ++X) {
+
+ /* Fetch next bit into byte buffer */
+ V = (V << 1) | (GetPixel (B, X, Y).Index & 0x01);
+
+ /* Store full bytes into the output buffer */
+ if ((X & 0x07) == 0x07) {
+ SB_AppendChar (D, V);
+ V = 0;
+ }
+ }
+ } else {
+ for (X = 0; X < WIDTH_MC; ++X) {
+
+ /* Fetch next bit into byte buffer */
+ V = (V << 2) | (GetPixel (B, X, Y).Index & 0x03);
+
+ /* Store full bytes into the output buffer */
+ if ((X & 0x03) == 0x03) {
+ SB_AppendChar (D, V);
+ V = 0;
+ }
+ }
+ }
+ }
+
+ /* Return the converted bitmap */
+ return D;
+}
+
+
+
--- /dev/null
+/*****************************************************************************/
+/* */
+/* lynxsprite.h */
+/* */
+/* Lynx sprite format backend for the sp65 sprite and bitmap utility */
+/* */
+/* */
+/* */
+/* (C) 2012, Ullrich von Bassewitz */
+/* Roemerstrasse 52 */
+/* D-70794 Filderstadt */
+/* EMail: uz@cc65.org */
+/* */
+/* */
+/* 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. */
+/* */
+/*****************************************************************************/
+
+
+
+#ifndef LYNXSPRITE_H
+#define LYNXSPRITE_H
+
+
+
+/* common */
+#include "coll.h"
+#include "strbuf.h"
+
+/* sp65 */
+#include "bitmap.h"
+
+
+
+/*****************************************************************************/
+/* Code */
+/*****************************************************************************/
+
+
+
+StrBuf* GenLynxSprite (const Bitmap* B, const Collection* A);
+/* Generate binary output in packed Lynx sprite format for the bitmap B. The output
+ * is stored in a string buffer (which is actually a dynamic char array) and
+ * returned.
+ */
+
+
+
+/* End of lynxsprite.h */
+
+#endif
+
+
+
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