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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,27 @@ | ||
| ; { "technology": "Simple Tile Compression 0", "extension": "stc0compr" } | ||
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| .memorymap | ||
| defaultslot 0 | ||
| slotsize $4000 | ||
| slot 0 $0000 | ||
| .endme | ||
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| .rombankmap | ||
| bankstotal 1 | ||
| banksize $4000 | ||
| banks 1 | ||
| .endro | ||
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| .bank 0 slot 0 | ||
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| .org 0 | ||
| ld hl,data | ||
| ld de,$4000 | ||
| call stc0_decompress | ||
| ret ; ends the test | ||
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| .block "decompressor" | ||
| .include "../decompressors/stc0_decomp.asm" | ||
| .endb | ||
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| data: .incbin "data.stc0compr" |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,123 @@ | ||
| #include <cstdint> | ||
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| extern "C" __declspec(dllexport) const char* getName() | ||
| { | ||
| return "Simple Tile Compressor Zero"; | ||
| } | ||
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| extern "C" __declspec(dllexport) const char* getExt() | ||
| { | ||
| return "stc0compr"; | ||
| } | ||
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| extern "C" __declspec(dllexport) int compressTiles( | ||
| const uint8_t* pSource, | ||
| const uint32_t numTiles, | ||
| uint8_t* pDestination, | ||
| const uint32_t destinationLength) | ||
| { | ||
| if (destinationLength < numTiles * 40 + 1) | ||
| { | ||
| return 0; | ||
| } | ||
| // please give me more space for the data (up to 40 bytes per tile needed worst case scenario, plus 1 byte terminator) | ||
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| uint8_t lastValue = 0; | ||
| uint8_t values[4]; | ||
| int finalSize = 0; | ||
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| for (unsigned int tileNumber = 0; tileNumber < numTiles; tileNumber++) | ||
| { | ||
| // loop over all tiles | ||
| for (unsigned char i = 0; i < 8; i++) | ||
| { | ||
| // loop over all the 8 rows of the tile | ||
| unsigned char mask = 0b00000000; | ||
| bool lastValid = false; | ||
| unsigned char valuesCount = 0; | ||
|
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| if (pSource[0] == 0x00) | ||
| { | ||
| mask |= 0b10000000; | ||
| } | ||
| else if (pSource[0] == 0xFF) | ||
| { | ||
| mask |= 0b11000000; | ||
| } | ||
| else | ||
| { | ||
| mask |= 0b01000000; // raw | ||
| lastValid = true; | ||
| lastValue = pSource[0]; | ||
| values[valuesCount++] = pSource[0]; | ||
| } | ||
|
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| if (pSource[1] == 0x00) | ||
| { | ||
| mask |= 0b00100000; | ||
| } | ||
| else if (pSource[1] == 0xFF) | ||
| { | ||
| mask |= 0b00110000; | ||
| } | ||
| else if (!lastValid || | ||
| pSource[1] != lastValue) | ||
| { | ||
| mask |= 0b00010000; // raw | ||
| lastValid = true; | ||
| lastValue = pSource[1]; | ||
| values[valuesCount++] = pSource[1]; | ||
| } | ||
|
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| if (pSource[2] == 0x00) | ||
| { | ||
| mask |= 0b00001000; | ||
| } | ||
| else if (pSource[2] == 0xFF) | ||
| { | ||
| mask |= 0b00001100; | ||
| } | ||
| else if (!lastValid || | ||
| pSource[2] != lastValue) | ||
| { | ||
| mask |= 0b00000100; // raw | ||
| lastValid = true; | ||
| lastValue = pSource[2]; | ||
| values[valuesCount++] = pSource[2]; | ||
| } | ||
|
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| if (pSource[3] == 0x00) | ||
| { | ||
| mask |= 0b00000010; | ||
| } | ||
| else if (pSource[3] == 0xFF) | ||
| { | ||
| mask |= 0b00000011; | ||
| } | ||
| else if (!lastValid || | ||
| pSource[3] != lastValue) | ||
| { | ||
| mask |= 0b00000001; // raw | ||
| lastValid = true; | ||
| lastValue = pSource[3]; | ||
| values[valuesCount++] = pSource[3]; | ||
| } | ||
|
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| *pDestination++ = mask; // write mask byte | ||
|
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| for (unsigned char j = 0; j < valuesCount; j++) | ||
| { | ||
| *pDestination++ = values[j]; // dump uncompressed values | ||
| } | ||
|
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| finalSize += 1 + valuesCount; // add this to finalSize | ||
|
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| pSource += 4; // skip to next 4 bytes | ||
| } | ||
| } | ||
|
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| *pDestination = 0x00; // end of data | ||
| finalSize++; | ||
|
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||
| return finalSize; // report size to caller | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,87 @@ | ||
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