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Got MatrixUtil to compile, and refactored some methods out of it, and into Matrix where they belong.

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git-svn-id: https://zxing.googlecode.com/svn/trunk@702 59b500cc-1b3d-0410-9834-0bbf25fbcc57
This commit is contained in:
dswitkin 2008-11-14 16:21:05 +00:00
parent 97ffa36734
commit b625c6f7e5
3 changed files with 77 additions and 76 deletions
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29
core/src/com/google/zxing/qrcode/encoder/Matrix.java
View file

@ -58,4 +58,33 @@ public final class Matrix {
bytes[y][x] = (byte) value;
}
public final void clear(byte value) {
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
bytes[y][x] = value;
}
}
}
public final String toString() {
StringBuffer result = new StringBuffer();
for (int y = 0; y < height; ++y) {
for (int x = 0; x < width; ++x) {
switch (bytes[y][x]) {
case 0:
result.append(" 0");
break;
case 1:
result.append(" 1");
break;
default:
result.append(" ");
break;
}
}
result.append("\n");
}
return result.toString();
}
}

112
core/src/com/google/zxing/qrcode/encoder/MatrixUtil.java
View file

@ -16,8 +16,6 @@
package com.google.zxing.qrcode.encoder;
// #include "util/array/array2d-inl.h"
/**
* @author satorux@google.com (Satoru Takabayashi) - creator
* @author dswitkin@google.com (Daniel Switkin) - ported from C++
@ -114,50 +112,24 @@ public final class MatrixUtil {
};
// From Appendix D in JISX0510:2004 (p. 67)
private static final uint32 kVersionInfoPoly = 0x1f25; // 1 1111 0010 0101
private static final int kVersionInfoPoly = 0x1f25; // 1 1111 0010 0101
// From Appendix C in JISX0510:2004 (p.65).
private static final uint32 kTypeInfoPoly = 0x537;
private static final uint32 kTypeInfoMaskPattern = 0x5412;
private static final int kTypeInfoPoly = 0x537;
private static final int kTypeInfoMaskPattern = 0x5412;
// Set all cells to -1. -1 means that the cell is empty (not set yet).
//
// JAVAPORT: We shouldn't need to do this at all. The code should be rewritten to begin encoding
// with the Matrix initialized all to zero.
public static void ClearMatrix(Matrix matrix) {
for (int y = 0; y < matrix.height(); ++y) {
for (int x = 0; x < matrix.width(); ++x) {
matrix.set(y, x, -1);
}
}
}
// Convert "matrix" to ASCII String for debugging.
public static String ToASCII(final Matrix matrix) {
StringBuffer result = new StringBuffer();
for (int y = 0; y < matrix.height(); ++y) {
for (int x = 0; x < matrix.width(); ++x) {
switch (matrix.get(y, x)) {
case 0:
result.append(" 0");
break;
case 1:
result.append(" 1");
break;
default:
result.append(" ");
break;
}
}
result.append("\n");
}
return result.toString();
matrix.clear((byte) -1);
}
// Build 2D matrix of QR Code from "data_bits" with "ec_level", "version" and "mask_pattern". On
// success, store the result in "matrix" and return true. On error, return false.
public static boolean BuildMatrix(final BitVector &data_bits,
int ec_level,
int version,
int mask_pattern,
Matrix matrix) {
public static boolean BuildMatrix(final BitVector data_bits, int ec_level, int version,
int mask_pattern, Matrix matrix) {
MatrixUtil.ClearMatrix(matrix);
if (!EmbedBasicPatterns(version, matrix)) {
return false;
@ -195,8 +167,8 @@ public final class MatrixUtil {
// Embed type information. On success, modify the matrix and return true. On error, return false.
public static boolean EmbedTypeInfo(int ec_level, int mask_pattern, Matrix matrix) {
BitVector type_info_bits;
if (!MakeTypeInfoBits(ec_level, mask_pattern, &type_info_bits)) {
BitVector type_info_bits = new BitVector();
if (!MakeTypeInfoBits(ec_level, mask_pattern, type_info_bits)) {
return false;
}
Debug.DCHECK_EQ(15, type_info_bits.size());
@ -233,8 +205,8 @@ public final class MatrixUtil {
if (version < 7) { // Version info is necessary if version >= 7.
return true; // Don't need version info.
}
BitVector version_info_bits;
if (!MakeVersionInfoBits(version, &version_info_bits)) {
BitVector version_info_bits = new BitVector();
if (!MakeVersionInfoBits(version, version_info_bits)) {
return false;
}
@ -243,7 +215,8 @@ public final class MatrixUtil {
for (int i = 0; i < 6; ++i) {
for (int j = 0; j < 3; ++j) {
// Place bits in LSB (least significant bit) to MSB order.
final int bit = version_info_bits.at(bit_index--);
final int bit = version_info_bits.at(bit_index);
bit_index--;
// Left bottom corner.
matrix.set(matrix.height() - 11 + j, i, bit);
// Right bottom corner.
@ -256,7 +229,7 @@ public final class MatrixUtil {
// Embed "data_bits" using "mask_pattern". On success, modify the matrix and return true. On
// error, return false. For debugging purposes, it skips masking process if "mask_pattern" is -1.
// See 8.7 of JISX0510:2004 (p.38) for how to embed data bits.
public static boolean EmbedDataBits(final BitVector &data_bits, int mask_pattern, Matrix matrix) {
public static boolean EmbedDataBits(final BitVector data_bits, int mask_pattern, Matrix matrix) {
int bit_index = 0;
int direction = -1;
// Start from the right bottom cell.
@ -313,7 +286,7 @@ public final class MatrixUtil {
// - FindMSBSet(0) => 0
// - FindMSBSet(1) => 1
// - FindMSBSet(255) => 8
public static int FindMSBSet(uint32 value) {
public static int FindMSBSet(int value) {
int num_digits = 0;
while (value != 0) {
value >>= 1;
@ -347,7 +320,7 @@ public final class MatrixUtil {
//
// Since all coefficients in the polynomials are 1 or 0, we can do the calculation by bit
// operations. We don't care if cofficients are positive or negative.
public static uint32 CalculateBCHCode(uint32 value, uint32 poly) {
public static int CalculateBCHCode(int value, int poly) {
// If poly is "1 1111 0010 0101" (version info poly), msb_set_in_poly is 13. We'll subtract 1
// from 13 to make it 12.
final int msb_set_in_poly = FindMSBSet(poly);
@ -363,7 +336,7 @@ public final class MatrixUtil {
// Make bit vector of type information. On success, store the result in "bits" and return true.
// On error, return false. Encode error correction level and mask pattern. See 8.9 of
// JISX0510:2004 (p.45) for details.
public static boolean MakeTypeInfoBits(int ec_level, final int mask_pattern, BitVector *bits) {
public static boolean MakeTypeInfoBits(int ec_level, final int mask_pattern, BitVector bits) {
final int ec_code = QRCode.GetECLevelCode(ec_level);
if (ec_code == -1) {
return false;
@ -371,14 +344,13 @@ public final class MatrixUtil {
if (!QRCode.IsValidMaskPattern(mask_pattern)) {
return false;
}
final uint32 type_info = (ec_code << 3) | mask_pattern;
final int type_info = (ec_code << 3) | mask_pattern;
bits.AppendBits(type_info, 5);
final uint32 bch_code = MatrixUtil.CalculateBCHCode(type_info,
kTypeInfoPoly);
final int bch_code = MatrixUtil.CalculateBCHCode(type_info, kTypeInfoPoly);
bits.AppendBits(bch_code, 10);
BitVector mask_bits;
BitVector mask_bits = new BitVector();
mask_bits.AppendBits(kTypeInfoMaskPattern, 15);
bits.XOR(mask_bits);
@ -391,11 +363,11 @@ public final class MatrixUtil {
// Make bit vector of version information. On success, store the result in "bits" and return true.
// On error, return false. See 8.10 of JISX0510:2004 (p.45) for details.
public static boolean MakeVersionInfoBits(int version, BitVector *bits) {
public static boolean MakeVersionInfoBits(int version, BitVector bits) {
bits.AppendBits(version, 6);
final uint32 bch_code = MatrixUtil.CalculateBCHCode(version,
kVersionInfoPoly);
final int bch_code = MatrixUtil.CalculateBCHCode(version, kVersionInfoPoly);
bits.AppendBits(bch_code, 12);
if (bits.size() != 18) { // Just in case.
Debug.LOG_ERROR("should not happen but we got: " + bits.size());
return false;
@ -442,8 +414,8 @@ public final class MatrixUtil {
private static void EmbedHorizontalSeparationPattern(final int x_start, final int y_start,
Matrix matrix) {
// We know the width and height.
Debug.DCHECK_EQ(8, arraysize(kHorizontalSeparationPattern[0]));
Debug.DCHECK_EQ(1, arraysize(kHorizontalSeparationPattern));
Debug.DCHECK_EQ(8, kHorizontalSeparationPattern[0].length);
Debug.DCHECK_EQ(1, kHorizontalSeparationPattern.length);
for (int x = 0; x < 8; ++x) {
Debug.DCHECK(IsEmpty(matrix.get(y_start, x_start + x)));
matrix.set(y_start, x_start + x, kHorizontalSeparationPattern[0][x]);
@ -453,8 +425,8 @@ public final class MatrixUtil {
private static void EmbedVerticalSeparationPattern(final int x_start, final int y_start,
Matrix matrix) {
// We know the width and height.
Debug.DCHECK_EQ(1, arraysize(kVerticalSeparationPattern[0]));
Debug.DCHECK_EQ(7, arraysize(kVerticalSeparationPattern));
Debug.DCHECK_EQ(1, kVerticalSeparationPattern[0].length);
Debug.DCHECK_EQ(7, kVerticalSeparationPattern.length);
for (int y = 0; y < 7; ++y) {
Debug.DCHECK(IsEmpty(matrix.get(y_start + y, x_start)));
matrix.set(y_start + y, x_start, kVerticalSeparationPattern[y][0]);
@ -467,8 +439,8 @@ public final class MatrixUtil {
private static void EmbedPositionAdjustmentPattern(final int x_start, final int y_start,
Matrix matrix) {
// We know the width and height.
Debug.DCHECK_EQ(5, arraysize(kPositionAdjustmentPattern[0]));
Debug.DCHECK_EQ(5, arraysize(kPositionAdjustmentPattern));
Debug.DCHECK_EQ(5, kPositionAdjustmentPattern[0].length);
Debug.DCHECK_EQ(5, kPositionAdjustmentPattern.length);
for (int y = 0; y < 5; ++y) {
for (int x = 0; x < 5; ++x) {
Debug.DCHECK(IsEmpty(matrix.get(y_start + y, x_start + x)));
@ -480,8 +452,8 @@ public final class MatrixUtil {
private static void EmbedPositionDetectionPattern(final int x_start, final int y_start,
Matrix matrix) {
// We know the width and height.
Debug.DCHECK_EQ(7, arraysize(kPositionDetectionPattern[0]));
Debug.DCHECK_EQ(7, arraysize(kPositionDetectionPattern));
Debug.DCHECK_EQ(7, kPositionDetectionPattern[0].length);
Debug.DCHECK_EQ(7, kPositionDetectionPattern.length);
for (int y = 0; y < 7; ++y) {
for (int x = 0; x < 7; ++x) {
Debug.DCHECK(IsEmpty(matrix.get(y_start + y, x_start + x)));
@ -493,7 +465,7 @@ public final class MatrixUtil {
// Embed position detection patterns and surrounding vertical/horizontal separators.
private static void EmbedPositionDetectionPatternsAndSeparators(Matrix matrix) {
// Embed three big squares at corners.
final int pdp_width = arraysize(kPositionDetectionPattern[0]);
final int pdp_width = kPositionDetectionPattern[0].length;
// Left top corner.
EmbedPositionDetectionPattern(0, 0, matrix);
// Right top corner.
@ -502,7 +474,7 @@ public final class MatrixUtil {
EmbedPositionDetectionPattern(0, matrix.width() - pdp_width, matrix);
// Embed horizontal separation patterns around the squares.
final int hsp_width = arraysize(kHorizontalSeparationPattern[0]);
final int hsp_width = kHorizontalSeparationPattern[0].length;
// Left top corner.
EmbedHorizontalSeparationPattern(0, hsp_width - 1, matrix);
// Right top corner.
@ -512,13 +484,13 @@ public final class MatrixUtil {
EmbedHorizontalSeparationPattern(0, matrix.width() - hsp_width, matrix);
// Embed vertical separation patterns around the squares.
final int vsp_height = arraysize(kVerticalSeparationPattern);
final int vsp_size = kVerticalSeparationPattern.length;
// Left top corner.
EmbedVerticalSeparationPattern(vsp_height, 0, matrix);
EmbedVerticalSeparationPattern(vsp_size, 0, matrix);
// Right top corner.
EmbedVerticalSeparationPattern(matrix.height() - vsp_height - 1, 0, matrix);
EmbedVerticalSeparationPattern(matrix.height() - vsp_size - 1, 0, matrix);
// Left bottom corner.
EmbedVerticalSeparationPattern(vsp_height, matrix.height() - vsp_height,
EmbedVerticalSeparationPattern(vsp_size, matrix.height() - vsp_size,
matrix);
}
@ -528,10 +500,8 @@ public final class MatrixUtil {
return;
}
final int index = version - 1;
final int *coordinates =
kPositionAdjustmentPatternCoordinateTable[index];
final int num_coordinates =
arraysize(kPositionAdjustmentPatternCoordinateTable[index]);
final int[] coordinates = kPositionAdjustmentPatternCoordinateTable[index];
final int num_coordinates = kPositionAdjustmentPatternCoordinateTable[index].length;
for (int i = 0; i < num_coordinates; ++i) {
for (int j = 0; j < num_coordinates; ++j) {
final int y = coordinates[i];

6
core/src/com/google/zxing/qrcode/encoder/QRCode.java
View file

@ -186,7 +186,7 @@ public final class QRCode {
result.append("\n matrix: null");
} else {
result.append("\n matrix:");
result.append(MatrixUtil.ToASCII(matrix_));
result.append(matrix_.toString());
}
result.append("\n>>\n");
return result.toString();
@ -357,8 +357,10 @@ public final class QRCode {
}
// Return true if the all values in the matrix are binary numbers. Otherwise, return false.
//
// JAVAPORT: This is going to be super expensive and unnecessary, we should not call this in
// production. I'm leaving it because it may be useful for testing.
// production. I'm leaving it because it may be useful for testing. It should be removed entirely
// if Matrix is changed never to contain a -1.
private static boolean EverythingIsBinary(final Matrix matrix) {
for (int y = 0; y < matrix.height(); ++y) {
for (int x = 0; x < matrix.width(); ++x) {