mirror of https://github.com/cc65/cc65.git
828 lines
24 KiB
C
828 lines
24 KiB
C
/*****************************************************************************/
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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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#include <stdlib.h>
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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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smShaped
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};
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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 if (strcmp (Mode, "shaped") == 0) {
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return smShaped;
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} else {
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Error ("Invalid value for attribute 'mode'");
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}
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}
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return smAuto;
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}
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static unsigned GetActionPointX (const Bitmap* B, 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 action point x attribute */
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const char* ActionPointX = GetAttrVal (A, "ax");
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if (ActionPointX) {
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if (strcmp (ActionPointX, "mid") == 0) {
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return GetBitmapWidth (B) / 2;
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}
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if (strcmp (ActionPointX, "max") == 0) {
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return GetBitmapWidth (B) - 1;
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}
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return atoi(ActionPointX);
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} else {
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return 0;
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}
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}
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static unsigned GetActionPointY (const Bitmap* B, 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 action point y attribute */
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const char* ActionPointY = GetAttrVal (A, "ay");
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if (ActionPointY) {
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if (strcmp (ActionPointY, "mid") == 0) {
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return GetBitmapHeight (B) / 2;
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}
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if (strcmp (ActionPointY, "max") == 0) {
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return GetBitmapHeight (B) - 1;
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}
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return atoi(ActionPointY);
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} else {
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return 0;
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}
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}
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static unsigned GetEdgeIndex (const Collection* A)
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/* Return the sprite mode from the attribute collection A */
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{
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/* Get index for edge color in shaped mode */
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const char* EdgeIndex = GetAttrVal (A, "edge");
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if (EdgeIndex) {
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return atoi(EdgeIndex);
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} else {
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return 0;
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}
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}
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static unsigned GetQuadrant (const Collection* A)
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/* Return the sprite mode from the attribute collection A */
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{
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/* Get index for edge color in shaped mode */
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const char* Quadrant = GetAttrVal (A, "quadrant");
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if (Quadrant) {
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return atoi(Quadrant);
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} else {
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return 0;
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}
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}
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static void OptimizePenpal (const Bitmap* B, char *PenPal)
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/* Create an optimal Penpal */
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{
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char usage[16];
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unsigned I, J, Val;
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memset(usage, 0, sizeof(usage));
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for (J = 0; J < GetBitmapHeight (B); J++) {
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for (I = 0; I < GetBitmapWidth (B); I++) {
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Val = GetPixel (B, I, J).Index;
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if (Val < 16) {
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usage[Val] = 1;
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}
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}
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}
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J = 0;
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for (I = 0; I < 16; I++) {
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if (usage[I]) {
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switch (I) {
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case 0:
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PenPal[J] = '0';
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break;
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case 1:
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PenPal[J] = '1';
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break;
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case 2:
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PenPal[J] = '2';
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break;
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case 3:
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PenPal[J] = '3';
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break;
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case 4:
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PenPal[J] = '4';
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break;
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case 5:
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PenPal[J] = '5';
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break;
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case 6:
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PenPal[J] = '6';
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break;
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case 7:
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PenPal[J] = '7';
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break;
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case 8:
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PenPal[J] = '8';
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break;
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case 9:
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PenPal[J] = '9';
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break;
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case 10:
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PenPal[J] = 'a';
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break;
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case 11:
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PenPal[J] = 'b';
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break;
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case 12:
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PenPal[J] = 'c';
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break;
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case 13:
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PenPal[J] = 'd';
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break;
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case 14:
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PenPal[J] = 'e';
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break;
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case 15:
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PenPal[J] = 'f';
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break;
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}
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J++;
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}
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}
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while (J < 16) {
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PenPal[J] = 0;
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J++;
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}
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/* printf("Penpal %s\n", PenPal); */
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}
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static unsigned GetPenpal (const Bitmap* B, const Collection* A, char *PenPal)
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/* Return the penpal from the attribute collection A */
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{
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const char* Pen = GetAttrVal (A, "pen");
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if (Pen) {
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if (strcmp (Pen, "opt") == 0) {
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/* So we need to optimize the penpal and colour depth */
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OptimizePenpal (B, PenPal);
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} else {
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strncpy(PenPal, Pen, 17);
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}
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return 1;
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}
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return 0;
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}
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static unsigned GetBPP (const Collection* A)
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/* Return the sprite depth from the attribute collection A */
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{
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/* Get index for edge color in shaped mode */
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const char* BPP = GetAttrVal (A, "bpp");
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if (BPP) {
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return atoi(BPP);
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} else {
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return 0;
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}
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}
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static char OutBuffer[512]; /* The maximum size is 508 pixels */
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static unsigned char OutIndex;
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static void AssembleByte(unsigned bits, char val)
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{
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static char bit_counter = 8, byte = 0;
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/* initialize */
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if (!bits) {
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OutIndex = 0;
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bit_counter = 8;
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byte = 0;
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return;
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}
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/* handle end of line */
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if (bits == 7) {
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if (bit_counter != 8) {
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byte <<= bit_counter;
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OutBuffer[OutIndex++] = byte;
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if (!OutIndex) {
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Error ("Sprite is too large for the Lynx");
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}
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} else {
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/* Add pad byte */
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byte = 0;
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OutBuffer[OutIndex++] = byte;
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if (!OutIndex) {
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Error ("Sprite is too large for the Lynx");
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}
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}
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return;
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}
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val <<= 8 - bits;
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do {
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byte <<= 1;
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if (val & 0x80)
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++byte;
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if (!(--bit_counter)) {
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OutBuffer[OutIndex++] = byte;
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if (!OutIndex) {
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Error ("Sprite is too large for the Lynx");
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}
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byte = 0;
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bit_counter = 8;
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}
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val <<= 1;
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} while (--bits);
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}
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static unsigned char AnalyseNextChunks(signed *newlen, signed len, char data[32], char ColorBits)
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{
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char longest = 1;
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unsigned char prev = 255;
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char count = 0;
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char index = 0;
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char lindex = 0;
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int i;
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int literal_cost;
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int packed_cost;
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for (i = 0; i < len; i++) {
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index = index + 1;
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if (data[i] == prev) {
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count = count + 1;
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if (count >= longest) {
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longest = count;
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lindex = index - count;
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}
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} else {
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prev = data[i];
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count = 1;
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}
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}
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if (longest == 1) {
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if (len > 16) {
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*newlen = 16;
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} else {
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*newlen = len;
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}
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return 'L';
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}
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if ((lindex > 0) && (lindex + longest > 15)) {
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/* We cannot pack the stride in this packet */
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*newlen = lindex;
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return 'A';
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}
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/* Cost till end of area */
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literal_cost = 5 + lindex * ColorBits + longest * ColorBits;
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packed_cost = 5 + lindex * ColorBits + 5 + ColorBits;
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if (packed_cost < literal_cost) {
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if (lindex == 0) {
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/* Use packed data */
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if (longest > 16) {
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*newlen = 16;
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} else {
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*newlen = longest;
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}
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return 'P';
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}
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/* We had a good find, but it was not at the start of the line */
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*newlen = lindex;
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return 'A';
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}
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/* There is no point in packing - use literal */
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if (len > 16) {
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*newlen = 16;
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} else {
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*newlen = len;
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}
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return 'L';
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}
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static unsigned char GetNextChunk(signed *newlen, signed len, char data[32], char ColorBits)
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{
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char oper = 'A';
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while (oper == 'A') {
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oper = AnalyseNextChunks(newlen, len, data, ColorBits);
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len = *newlen;
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}
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return oper; /* The packet type is now P or L and the length is in newlen */
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}
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static void WriteOutBuffer(StrBuf *D)
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{
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signed i;
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/* Fix bug in Lynx where the count cannot be 1 */
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if (OutIndex == 1) {
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OutBuffer[OutIndex++] = 0;
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}
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/* Write the byte count to the end of the scanline */
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if (OutIndex == 255) {
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Error ("Sprite is too large for the Lynx");
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}
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SB_AppendChar (D, OutIndex+1);
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/* Write scanline data */
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for (i = 0; i < OutIndex; i++) {
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SB_AppendChar (D, OutBuffer[i]);
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}
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}
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static void encodeSprite(StrBuf *D, enum Mode M, char ColorBits, char ColorMask, char LineBuffer[512],
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int len, int LastOpaquePixel) {
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/*
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* The data starts with a byte count. It tells the number of bytes on this
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* line + 1.
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* Special case is a count of 1. It will change to next quadrant.
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* Other special case is 0. It will end the sprite.
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*
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* Ordinary data packet. These are bits in a stream.
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* 1=literal 0=packed
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* 4 bit count (+1)
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* for literal you put "count" values
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* for packed you repeat the value "count" times
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* Never use packed mode for one pixel
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* If the last bit on a line is in use you need to add a byte of zeroes
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* A sequence 00000 ends a scan line
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*
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* All data is high nybble first
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*/
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unsigned char V = 0;
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signed i;
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signed count;
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AssembleByte(0, 0);
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switch (M) {
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case smAuto:
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case smLiteral:
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for (i = 0; i < len; i++) {
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/* Fetch next pixel index into pixel buffer */
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AssembleByte(ColorBits, LineBuffer[i] & ColorMask);
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}
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AssembleByte(7, 0);
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/* Write the buffer to file */
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WriteOutBuffer(D);
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break;
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case smPacked:
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case smShaped:
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if (M == smShaped) {
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if (LastOpaquePixel > -1) {
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if (LastOpaquePixel < len - 1) {
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len = LastOpaquePixel + 1;
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}
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} else {
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len = 0;
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}
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}
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i = 0;
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while (len) {
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signed analyselen;
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analyselen = len;
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if (analyselen > 32) {
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analyselen = 32;
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}
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if (GetNextChunk(&count, analyselen, LineBuffer + i, ColorBits) == 'P') {
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/* Make runlength packet */
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V = LineBuffer[i];
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i += count;
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len -= count;
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AssembleByte(5, count-1);
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AssembleByte(ColorBits, V & ColorMask);
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} else {
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/* Make packed literal packet */
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AssembleByte(5, (count-1) | 0x10);
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do {
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AssembleByte(ColorBits, LineBuffer[i]);
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i++;
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len--;
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} while (--count > 0);
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}
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}
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/* Force EOL for shaped? AssembleByte(5, 0); */
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AssembleByte(7, 0);
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/* Write the buffer to file */
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WriteOutBuffer(D);
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break;
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}
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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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** The Lynx will draw 4 quadrants:
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** 0 - Down right
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** 1 - Up right
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** 2 - Up left
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** 3 - Down left
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**
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** The sprite will end with a byte 0.
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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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signed X, Y;
|
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unsigned OX, OY;
|
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char ColorBits;
|
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char ColorMask;
|
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char EdgeIndex;
|
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char Quadrant;
|
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char quad;
|
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char BPP;
|
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/* The default mapping is 1:1 plus extra colours become 0 */
|
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char Map[17] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0};
|
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signed PenColors;
|
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char PenPal[18];
|
|
signed Val;
|
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|
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/* Get EdgeIndex */
|
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EdgeIndex = GetEdgeIndex (A);
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|
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/* Get Quadrant for starting the draw process */
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Quadrant = GetQuadrant (A) & 3;
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|
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/* Action point of the sprite */
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OX = GetActionPointX (B, A);
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OY = GetActionPointY (B, A);
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if (OX >= GetBitmapWidth (B)) {
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Error ("Action point X cannot be larger than bitmap width");
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}
|
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if (OY >= GetBitmapHeight (B)) {
|
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Error ("Action point Y cannot be larger than bitmap height");
|
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}
|
|
|
|
/* Output the image properties */
|
|
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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|
|
|
/* Now check how to do the mapping */
|
|
if (GetPenpal (B, A, &PenPal[0])) {
|
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signed I;
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|
|
/* Modify the map by content of PenPal */
|
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PenColors = strlen(PenPal);
|
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for (I = 0; I < PenColors; I++) {
|
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switch (PenPal[I]) {
|
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case '0':
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Map[0] = I;
|
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break;
|
|
case '1':
|
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Map[1] = I;
|
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break;
|
|
case '2':
|
|
Map[2] = I;
|
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break;
|
|
case '3':
|
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Map[3] = I;
|
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break;
|
|
case '4':
|
|
Map[4] = I;
|
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break;
|
|
case '5':
|
|
Map[5] = I;
|
|
break;
|
|
case '6':
|
|
Map[6] = I;
|
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break;
|
|
case '7':
|
|
Map[7] = I;
|
|
break;
|
|
case '8':
|
|
Map[8] = I;
|
|
break;
|
|
case '9':
|
|
Map[9] = I;
|
|
break;
|
|
case 'a':
|
|
case 'A':
|
|
Map[10] = I;
|
|
break;
|
|
case 'b':
|
|
case 'B':
|
|
Map[11] = I;
|
|
break;
|
|
case 'c':
|
|
case 'C':
|
|
Map[12] = I;
|
|
break;
|
|
case 'd':
|
|
case 'D':
|
|
Map[13] = I;
|
|
break;
|
|
case 'e':
|
|
case 'E':
|
|
Map[14] = I;
|
|
break;
|
|
case 'f':
|
|
case 'F':
|
|
Map[15] = I;
|
|
break;
|
|
/* The X is reserved as transparency. This allows for shaped sprites */
|
|
case 'x':
|
|
case 'X':
|
|
Map[16] = I;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
PenColors = GetBitmapColors (B);
|
|
}
|
|
ColorBits = 4;
|
|
if (PenColors < 9) {
|
|
ColorBits = 3;
|
|
}
|
|
if (PenColors < 5) {
|
|
ColorBits = 2;
|
|
}
|
|
if (PenColors < 3) {
|
|
ColorBits = 1;
|
|
}
|
|
|
|
BPP = GetBPP (A);
|
|
if (BPP > 0) {
|
|
ColorBits = BPP;
|
|
}
|
|
switch (ColorBits) {
|
|
case 1:
|
|
ColorMask = 0x01;
|
|
break;
|
|
case 2:
|
|
ColorMask = 0x03;
|
|
break;
|
|
case 3:
|
|
ColorMask = 0x07;
|
|
break;
|
|
default:
|
|
case 4:
|
|
ColorMask = 0x0f;
|
|
break;
|
|
}
|
|
/* B->BPP = ColorBits; */
|
|
/* Create the output buffer and resize it to the required size. */
|
|
D = NewStrBuf ();
|
|
SB_Realloc (D, 63);
|
|
|
|
for (quad = 0; quad < 4; quad++) {
|
|
switch ((Quadrant + quad) & 3) {
|
|
case 0:
|
|
/* Convert the image for quadrant bottom right */
|
|
for (Y = OY; Y < (signed)GetBitmapHeight (B); ++Y) {
|
|
signed i = 0;
|
|
signed LastOpaquePixel = -1;
|
|
char LineBuffer[512]; /* The maximum size is 508 pixels */
|
|
|
|
/* Fill the LineBuffer for easier optimisation */
|
|
for (X = OX; X < (signed)GetBitmapWidth (B); ++X) {
|
|
/* Fetch next bit into byte buffer */
|
|
Val = GetPixel (B, X, Y).Index;
|
|
if (Val > 16) Val = 16;
|
|
LineBuffer[i] = Map[Val] & ColorMask;
|
|
|
|
if (Val != EdgeIndex) {
|
|
LastOpaquePixel = i;
|
|
}
|
|
++i;
|
|
}
|
|
|
|
encodeSprite(D, M, ColorBits, ColorMask, LineBuffer, i, LastOpaquePixel);
|
|
}
|
|
if ((OY == 0) && (OX == 0)) {
|
|
/* Trivial case only one quadrant */
|
|
|
|
/* Mark end of sprite */
|
|
SB_AppendChar (D, 0);
|
|
|
|
/* Return the converted bitmap */
|
|
return D;
|
|
}
|
|
if ((quad == 1) && (OY == 0)) {
|
|
/* Special case only two quadrants */
|
|
|
|
/* Mark end of sprite */
|
|
SB_AppendChar (D, 0);
|
|
|
|
/* Return the converted bitmap */
|
|
return D;
|
|
}
|
|
break;
|
|
case 1:
|
|
/* Convert the image for quadrant top right */
|
|
for (Y = OY - 1; Y >= 0; --Y) {
|
|
signed i = 0;
|
|
signed LastOpaquePixel = -1;
|
|
char LineBuffer[512]; /* The maximum size is 508 pixels */
|
|
|
|
/* Fill the LineBuffer for easier optimisation */
|
|
for (X = OX; X < (signed)GetBitmapWidth (B); ++X) {
|
|
/* Fetch next bit into byte buffer */
|
|
Val = GetPixel (B, X, Y).Index;
|
|
if (Val > 16) Val = 16;
|
|
|
|
LineBuffer[i] = Map[Val] & ColorMask;
|
|
|
|
if (Val != EdgeIndex) {
|
|
LastOpaquePixel = i;
|
|
}
|
|
++i;
|
|
}
|
|
|
|
encodeSprite(D, M, ColorBits, ColorMask, LineBuffer, i, LastOpaquePixel);
|
|
}
|
|
|
|
if ((OY == GetBitmapHeight (B) - 1) && (OX == 0)) {
|
|
/* Trivial case only one quadrant */
|
|
|
|
/* Mark end of sprite */
|
|
SB_AppendChar (D, 0);
|
|
|
|
/* Return the converted bitmap */
|
|
return D;
|
|
}
|
|
if ((quad == 1) && (OX == 0)) {
|
|
/* Special case only two quadrants */
|
|
|
|
/* Mark end of sprite */
|
|
SB_AppendChar (D, 0);
|
|
|
|
/* Return the converted bitmap */
|
|
return D;
|
|
}
|
|
break;
|
|
case 2:
|
|
/* Convert the image for quadrant top left */
|
|
for (Y = OY - 1; Y >= 0; --Y) {
|
|
signed i = 0;
|
|
signed LastOpaquePixel = -1;
|
|
char LineBuffer[512]; /* The maximum size is 508 pixels */
|
|
|
|
/* Fill the LineBuffer for easier optimisation */
|
|
for (X = OX - 1; X >= 0; --X) {
|
|
/* Fetch next bit into byte buffer */
|
|
Val = GetPixel (B, X, Y).Index;
|
|
if (Val > 16) Val = 16;
|
|
|
|
LineBuffer[i] = Map[Val] & ColorMask;
|
|
|
|
if (Val != EdgeIndex) {
|
|
LastOpaquePixel = i;
|
|
}
|
|
++i;
|
|
}
|
|
|
|
encodeSprite(D, M, ColorBits, ColorMask, LineBuffer, i, LastOpaquePixel);
|
|
}
|
|
if ((OY == GetBitmapHeight (B) - 1) && (OX == GetBitmapWidth (B) - 1)) {
|
|
/* Trivial case only one quadrant */
|
|
|
|
/* Mark end of sprite */
|
|
SB_AppendChar (D, 0);
|
|
|
|
/* Return the converted bitmap */
|
|
return D;
|
|
}
|
|
if ((quad == 1) && (OY == GetBitmapHeight (B) - 1)) {
|
|
/* Special case only two quadrants */
|
|
|
|
/* Mark end of sprite */
|
|
SB_AppendChar (D, 0);
|
|
|
|
/* Return the converted bitmap */
|
|
return D;
|
|
}
|
|
break;
|
|
case 3:
|
|
/* Convert the image for quadrant bottom left */
|
|
for (Y = OY; Y < (signed)GetBitmapHeight (B); ++Y) {
|
|
signed i = 0;
|
|
signed LastOpaquePixel = -1;
|
|
char LineBuffer[512]; /* The maximum size is 508 pixels */
|
|
|
|
/* Fill the LineBuffer for easier optimisation */
|
|
for (X = OX - 1; X >= 0; --X) {
|
|
/* Fetch next bit into byte buffer */
|
|
Val = GetPixel (B, X, Y).Index;
|
|
if (Val > 16) Val = 16;
|
|
|
|
LineBuffer[i] = Map[Val] & ColorMask;
|
|
|
|
if (Val != EdgeIndex) {
|
|
LastOpaquePixel = i;
|
|
}
|
|
++i;
|
|
}
|
|
|
|
encodeSprite(D, M, ColorBits, ColorMask, LineBuffer, i, LastOpaquePixel);
|
|
}
|
|
if ((OY == 0) && (OX == GetBitmapWidth (B) - 1)) {
|
|
/* Trivial case only one quadrant */
|
|
|
|
/* Mark end of sprite */
|
|
SB_AppendChar (D, 0);
|
|
|
|
/* Return the converted bitmap */
|
|
return D;
|
|
}
|
|
if ((quad == 1) && (OX == GetBitmapWidth (B) - 1)) {
|
|
/* Special case only two quadrants */
|
|
|
|
/* Mark end of sprite */
|
|
SB_AppendChar (D, 0);
|
|
|
|
/* Return the converted bitmap */
|
|
return D;
|
|
}
|
|
break;
|
|
}
|
|
if (quad < 3) {
|
|
/* Next quadrant */
|
|
SB_AppendChar (D, 1);
|
|
} else {
|
|
/* End sprite */
|
|
SB_AppendChar (D, 0);
|
|
}
|
|
}
|
|
|
|
/* Return the converted bitmap */
|
|
return D;
|
|
}
|