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Implement packed mode

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git-svn-id: svn://svn.cc65.org/cc65/trunk@5930 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
karri 2012-11-12 18:43:03 +00:00
parent db6e8cac09
commit 6f7952ec5a
1 changed files with 69 additions and 23 deletions
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92
src/sp65/lynxsprite.c
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@ -129,12 +129,58 @@ static void AssembleByte(unsigned bits, char val)
}
/* handle end of line */
if (bits == 8) {
byte <<= bit_counter;
OutBuffer[OutIndex++] = byte;
if (!OutIndex) {
Error ("Sprite is too large for the Lynx");
if (bit_counter != 8) {
byte <<= bit_counter;
OutBuffer[OutIndex++] = byte;
if (!OutIndex) {
Error ("Sprite is too large for the Lynx");
}
if (byte & 0x1) {
OutBuffer[OutIndex++] = byte;
if (!OutIndex) {
Error ("Sprite is too large for the Lynx");
}
}
}
if (byte & 0x1) {
return;
}
val <<= 8 - bits;
do {
byte <<= 1;
if (val & 0x80)
++byte;
if (!(--bit_counter)) {
OutBuffer[OutIndex++] = byte;
if (!OutIndex) {
Error ("Sprite is too large for the Lynx");
}
byte = 0;
bit_counter = 8;
}
val <<= 1;
} while (--bits);
}
static void AssembleByteLiteral(unsigned bits, char val)
{
static char bit_counter = 8, byte = 0;
/* initialize */
if (!bits) {
OutIndex = 0;
bit_counter = 8;
byte = 0;
return;
}
/* handle end of line */
if (bits == 8) {
if (bit_counter != 8) {
byte <<= bit_counter;
OutBuffer[OutIndex++] = byte;
if (!OutIndex) {
Error ("Sprite is too large for the Lynx");
@ -217,28 +263,31 @@ static void encodeSprite(StrBuf *D, enum Mode M, char ColorBits, char ColorMask,
unsigned char V = 0;
signed i;
signed count;
unsigned char differ[16];
unsigned char *d_ptr;
AssembleByte(0, 0);
switch (M) {
case smAuto:
case smLiteral:
AssembleByteLiteral(0, 0);
for (i = 0; i < len; i++) {
/* Fetch next pixel index into pixel buffer */
AssembleByte(ColorBits, LineBuffer[i] & ColorMask);
AssembleByteLiteral(ColorBits, LineBuffer[i] & ColorMask);
}
AssembleByteLiteral(8, 0);
/* Write the buffer to file */
WriteOutBuffer(D);
break;
case smPacked:
#if 0
AssembleByte(0, 0);
i = 0;
while (len) {
V = LineBuffer[i];
++i;
--len;
count = 0;
if (ChoosePackagingMode(len, i, LineBuffer)) {
/* Make runlength packet */
V = LineBuffer[i];
++i;
--len;
count = 0;
do {
++count;
++i;
@ -251,20 +300,16 @@ static void encodeSprite(StrBuf *D, enum Mode M, char ColorBits, char ColorMask,
} else {
/* Make packed literal packet */
d_ptr = differ;
while (V != LastBuffer[i] && len && count != 15) {
V = LineBuffer[i++];
*d_ptr++ = V;
--len;
count = 0;
while (ChoosePackagingMode(len, i, LineBuffer) == 0 && len && count != 15) {
V = LineBuffer[i++];
*d_ptr++ = V;
++count;
V = LineBuffar[i];
++i;
--len;
}
if (!len || count == 15)
*d_ptr = V;
else if (V == LineBuffer[i]) {
--count;
--i;
++len;
}
AssembleByte(5, count | 0x10);
d_ptr = differ;
@ -274,8 +319,9 @@ static void encodeSprite(StrBuf *D, enum Mode M, char ColorBits, char ColorMask,
}
}
#endif
AssembleByte(8, 0);
/* Write the buffer to file */
WriteOutBuffer(D);
break;
case smShaped: