1 /*****************************************************************************/
5 /* Lynx sprite format backend for the sp65 sprite and bitmap utility */
9 /* (C) 2012, Ullrich von Bassewitz */
10 /* Roemerstrasse 52 */
11 /* D-70794 Filderstadt */
12 /* EMail: uz@cc65.org */
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. */
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: */
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 */
32 /*****************************************************************************/
43 #include "lynxsprite.h"
47 /*****************************************************************************/
49 /*****************************************************************************/
60 /* Screen size of a koala picture */
67 /*****************************************************************************/
69 /*****************************************************************************/
73 static enum Mode GetMode (const Collection* A)
74 /* Return the sprite mode from the attribute collection A */
76 /* Check for a mode attribute */
77 const char* Mode = GetAttrVal (A, "mode");
79 if (strcmp (Mode, "literal") == 0) {
81 } else if (strcmp (Mode, "packed") == 0) {
84 Error ("Invalid value for attribute `mode'");
93 StrBuf* GenLynxSprite (const Bitmap* B, const Collection* A)
94 /* Generate binary output in Lynx sprite format for the bitmap B. The output
95 * is stored in a string buffer (which is actually a dynamic char array) and
104 /* Output the image properties */
105 Print (stdout, 1, "Image is %ux%u with %u colors%s\n",
106 GetBitmapWidth (B), GetBitmapHeight (B), GetBitmapColors (B),
107 BitmapIsIndexed (B)? " (indexed)" : "");
109 /* Get the sprite mode */
112 /* Check the height of the bitmap */
113 if (GetBitmapHeight (B) != HEIGHT) {
114 Error ("Invalid bitmap height (%u) for conversion to vic2 sprite",
115 GetBitmapHeight (B));
118 /* If the mode wasn't given, fallback to packed */
123 /* Now check if bitmap indexes are ok */
124 if (GetBitmapColors (B) > 16) {
125 Error ("Too many colors for a Lynx sprite");
128 /* Create the output buffer and resize it to the required size. */
132 /* Convert the image */
133 for (Y = 0; Y < HEIGHT; ++Y) {
135 if (M == smLiteral) {
136 for (X = 0; X < WIDTH_HR; ++X) {
138 /* Fetch next bit into byte buffer */
139 V = (V << 1) | (GetPixel (B, X, Y).Index & 0x01);
141 /* Store full bytes into the output buffer */
142 if ((X & 0x07) == 0x07) {
143 SB_AppendChar (D, V);
148 for (X = 0; X < WIDTH_MC; ++X) {
150 /* Fetch next bit into byte buffer */
151 V = (V << 2) | (GetPixel (B, X, Y).Index & 0x03);
153 /* Store full bytes into the output buffer */
154 if ((X & 0x03) == 0x03) {
155 SB_AppendChar (D, V);
162 /* Return the converted bitmap */