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package com.rox.ppu.debug; |
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import com.rox.cartridge.Cartridge; |
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/** |
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* Decodes a raw 16-byte NES CHR tile into an 8x8 grid of 2-bit pixel values (0-3): bytes 0-7 are |
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* bit-plane 0 (one byte per row), bytes 8-15 are bit-plane 1 - column 0 is each row byte's MSB, not |
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* its LSB. Pure decode logic only, no colour - callers (e.g. the debug viewer) decide how a 0-3 value |
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* maps to a displayed shade/colour. |
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*/ |
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public final class TileDecoder { |
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public static final int TILE_BYTES = 16; |
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private static final int TILE_SIZE = 8; |
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private static final int BITPLANE_SIZE = 8; |
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private TileDecoder(){ |
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} |
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/** |
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* @param tileBytes the tile's raw 16 CHR bytes |
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* @return an 8x8 grid, {@code pixels[row][col]}, each value 0-3 |
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*/ |
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public static int[][] decode(final int[] tileBytes){ |
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final int[][] pixels = new int[TILE_SIZE][TILE_SIZE]; |
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2
1. decode : negated conditional → KILLED
2. decode : changed conditional boundary → KILLED
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for (int row = 0; row < TILE_SIZE; row++){ |
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final int lowPlaneByte = tileBytes[row]; |
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1
1. decode : Replaced integer addition with subtraction → KILLED
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final int highPlaneByte = tileBytes[BITPLANE_SIZE + row]; |
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2
1. decode : changed conditional boundary → KILLED
2. decode : negated conditional → KILLED
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for (int col = 0; col < TILE_SIZE; col++){ |
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1
1. decode : Replaced integer subtraction with addition → KILLED
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final int bitShift = TILE_SIZE - 1 - col; |
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2
1. decode : Replaced bitwise AND with OR → KILLED
2. decode : Replaced Shift Right with Shift Left → KILLED
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final int lowBit = (lowPlaneByte >> bitShift) & 1; |
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2
1. decode : Replaced bitwise AND with OR → KILLED
2. decode : Replaced Shift Right with Shift Left → KILLED
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final int highBit = (highPlaneByte >> bitShift) & 1; |
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2
1. decode : Replaced bitwise OR with AND → KILLED
2. decode : Replaced Shift Left with Shift Right → KILLED
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pixels[row][col] = lowBit | (highBit << 1); |
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} |
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} |
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1. decode : replaced return value with null for com/rox/ppu/debug/TileDecoder::decode → KILLED
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return pixels; |
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} |
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/** |
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* @param cartridge from which to extract the tile |
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* @param tileBase from which to extract the tile |
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* @return the 2D array of pixels for this tile |
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*/ |
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static int[][] decode(final Cartridge cartridge, |
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final int tileBase){ |
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final int[] tileBytes = new int[TILE_BYTES]; |
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2
1. decode : changed conditional boundary → KILLED
2. decode : negated conditional → KILLED
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for (int i = 0; i < TILE_BYTES; i++){ |
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1. decode : Replaced integer addition with subtraction → KILLED
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tileBytes[i] = cartridge.readChr(tileBase + i); |
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} |
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1. decode : replaced return value with null for com/rox/ppu/debug/TileDecoder::decode → KILLED
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return decode(tileBytes); |
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} |
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/** |
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* @param cartridge from which to extract the tile |
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* @param patternTableBase from which to extract the tile |
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* @param tileIndex to extract |
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* @return the 2D array of pixels for this tile |
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*/ |
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public static int[][] decode(final Cartridge cartridge, |
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final int patternTableBase, |
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final int tileIndex){ |
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1. decode : Replaced integer multiplication with division → KILLED
2. decode : Replaced integer addition with subtraction → KILLED
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final int tileBase = patternTableBase + tileIndex * TILE_BYTES; |
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1. decode : replaced return value with null for com/rox/ppu/debug/TileDecoder::decode → KILLED
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return decode(cartridge, tileBase); |
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} |
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} |
| | Mutations |
| 25 |
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1.1
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:onlyLowPlaneSetDecodesToAllOnes()] negated conditional → KILLED
2.2
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:onlyLowPlaneSetDecodesToAllOnes()] changed conditional boundary → KILLED
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| 27 |
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1.1
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:eachRowIsDecodedIndependentlyFromItsOwnBytesNotTransposed()] Replaced integer addition with subtraction → KILLED
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| 28 |
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1.1
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:onlyLowPlaneSetDecodesToAllOnes()] changed conditional boundary → KILLED
2.2
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:onlyLowPlaneSetDecodesToAllOnes()] negated conditional → KILLED
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| 29 |
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1.1
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:onlyLowPlaneSetDecodesToAllOnes()] Replaced integer subtraction with addition → KILLED
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| 30 |
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1.1
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:onlyLowPlaneSetDecodesToAllOnes()] Replaced bitwise AND with OR → KILLED
2.2
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:onlyLowPlaneSetDecodesToAllOnes()] Replaced Shift Right with Shift Left → KILLED
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| 31 |
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1.1
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:onlyLowPlaneSetDecodesToAllOnes()] Replaced bitwise AND with OR → KILLED
2.2
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:eachRowIsDecodedIndependentlyFromItsOwnBytesNotTransposed()] Replaced Shift Right with Shift Left → KILLED
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| 32 |
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1.1
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:onlyLowPlaneSetDecodesToAllOnes()] Replaced bitwise OR with AND → KILLED
2.2
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:eachRowIsDecodedIndependentlyFromItsOwnBytesNotTransposed()] Replaced Shift Left with Shift Right → KILLED
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| 35 |
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1.1
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:onlyLowPlaneSetDecodesToAllOnes()] replaced return value with null for com/rox/ppu/debug/TileDecoder::decode → KILLED
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1.1
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:decodeFromCartridgeReadsExactlySixteenConsecutiveAddressesStartingAtTileBase()] changed conditional boundary → KILLED
2.2
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:decodeFromCartridgeReadsExactlySixteenConsecutiveAddressesStartingAtTileBase()] negated conditional → KILLED
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| 47 |
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1.1
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:decodeFromCartridgeReadsExactlySixteenConsecutiveAddressesStartingAtTileBase()] Replaced integer addition with subtraction → KILLED
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| 49 |
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1.1
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:decodeFromCartridgeReadsBytesStartingAtTileBase()] replaced return value with null for com/rox/ppu/debug/TileDecoder::decode → KILLED
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| 61 |
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1.1
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:decodeFromPatternTableAndIndexComputesTileBaseAsPatternTablePlusIndexTimesTileBytes()] Replaced integer multiplication with division → KILLED
2.2
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:decodeFromPatternTableAndIndexComputesTileBaseAsPatternTablePlusIndexTimesTileBytes()] Replaced integer addition with subtraction → KILLED
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| 62 |
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1.1
Location : decode
Killed by : com.rox.ppu.debug.TileDecoderTest.[engine:junit-jupiter]/[class:com.rox.ppu.debug.TileDecoderTest]/[method:decodeFromPatternTableAndIndexComputesTileBaseAsPatternTablePlusIndexTimesTileBytes()] replaced return value with null for com/rox/ppu/debug/TileDecoder::decode → KILLED
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