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QR-Code-generator
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Refactored 4 private C functions to move qrsize variable from parameter to local variable, updated callers, without changing behavior.

This commit is contained in:
Project Nayuki 2017-04-25 06:06:43 +00:00
parent bc12aa1dc6
commit 767084b80d
1 changed files with 19 additions and 16 deletions
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35
c/qrcodegen.c
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@ -58,13 +58,13 @@ testable uint8_t finiteFieldMultiply(uint8_t x, uint8_t y);
static void initializeFunctionModules(int version, uint8_t qrcode[]);
static void drawWhiteFunctionModules(uint8_t qrcode[], int version);
static void drawFormatBits(enum qrcodegen_Ecc ecl, enum qrcodegen_Mask mask, uint8_t qrcode[], int qrsize);
static void drawFormatBits(enum qrcodegen_Ecc ecl, enum qrcodegen_Mask mask, uint8_t qrcode[]);
testable int getAlignmentPatternPositions(int version, uint8_t result[7]);
static void fillRectangle(int left, int top, int width, int height, uint8_t qrcode[]);
static void drawCodewords(const uint8_t data[], int dataLen, uint8_t qrcode[], int qrsize);
static void applyMask(const uint8_t functionModules[], uint8_t qrcode[], int qrsize, enum qrcodegen_Mask mask);
static long getPenaltyScore(const uint8_t qrcode[], int qrsize);
static void drawCodewords(const uint8_t data[], int dataLen, uint8_t qrcode[]);
static void applyMask(const uint8_t functionModules[], uint8_t qrcode[], enum qrcodegen_Mask mask);
static long getPenaltyScore(const uint8_t qrcode[]);
static bool getModule(const uint8_t qrcode[], int x, int y);
static void setModule(uint8_t qrcode[], int x, int y, bool isBlack);
@ -295,8 +295,7 @@ static void encodeQrCodeTail(uint8_t dataAndQrcode[], int bitLen, uint8_t tempBu
// Draw function and data codeword modules
appendErrorCorrection(dataAndQrcode, version, ecl, tempBuffer);
initializeFunctionModules(version, dataAndQrcode);
int qrsize = qrcodegen_getSize(dataAndQrcode);
drawCodewords(tempBuffer, getNumRawDataModules(version) / 8, dataAndQrcode, qrsize);
drawCodewords(tempBuffer, getNumRawDataModules(version) / 8, dataAndQrcode);
drawWhiteFunctionModules(dataAndQrcode, version);
initializeFunctionModules(version, tempBuffer);
@ -304,19 +303,19 @@ static void encodeQrCodeTail(uint8_t dataAndQrcode[], int bitLen, uint8_t tempBu
if (mask == qrcodegen_Mask_AUTO) { // Automatically choose best mask
long minPenalty = LONG_MAX;
for (int i = 0; i < 8; i++) {
drawFormatBits(ecl, (enum qrcodegen_Mask)i, dataAndQrcode, qrsize);
applyMask(tempBuffer, dataAndQrcode, qrsize, (enum qrcodegen_Mask)i);
long penalty = getPenaltyScore(dataAndQrcode, qrsize);
drawFormatBits(ecl, (enum qrcodegen_Mask)i, dataAndQrcode);
applyMask(tempBuffer, dataAndQrcode, (enum qrcodegen_Mask)i);
long penalty = getPenaltyScore(dataAndQrcode);
if (penalty < minPenalty) {
mask = (enum qrcodegen_Mask)i;
minPenalty = penalty;
}
applyMask(tempBuffer, dataAndQrcode, qrsize, (enum qrcodegen_Mask)i); // Undoes the mask due to XOR
applyMask(tempBuffer, dataAndQrcode, (enum qrcodegen_Mask)i); // Undoes the mask due to XOR
}
}
assert(0 <= (int)mask && (int)mask <= 7);
drawFormatBits(ecl, mask, dataAndQrcode, qrsize);
applyMask(tempBuffer, dataAndQrcode, qrsize, mask);
drawFormatBits(ecl, mask, dataAndQrcode);
applyMask(tempBuffer, dataAndQrcode, mask);
}
@ -558,7 +557,7 @@ static void drawWhiteFunctionModules(uint8_t qrcode[], int version) {
// Draws two copies of the format bits (with its own error correction code) based
// on the given mask and error correction level. This always draws all modules of
// the format bits, unlike drawWhiteFunctionModules() which might skip black modules.
static void drawFormatBits(enum qrcodegen_Ecc ecl, enum qrcodegen_Mask mask, uint8_t qrcode[], int qrsize) {
static void drawFormatBits(enum qrcodegen_Ecc ecl, enum qrcodegen_Mask mask, uint8_t qrcode[]) {
// Calculate error correction code and pack bits
assert(0 <= (int)mask && (int)mask <= 7);
int data;
@ -587,6 +586,7 @@ static void drawFormatBits(enum qrcodegen_Ecc ecl, enum qrcodegen_Mask mask, uin
setModule(qrcode, 14 - i, 8, ((data >> i) & 1) != 0);
// Draw second copy
int qrsize = qrcodegen_getSize(qrcode);
for (int i = 0; i <= 7; i++)
setModule(qrcode, qrsize - 1 - i, 8, ((data >> i) & 1) != 0);
for (int i = 8; i < 15; i++)
@ -628,7 +628,8 @@ static void fillRectangle(int left, int top, int width, int height, uint8_t qrco
// Draws the raw codewords (including data and ECC) onto the given QR Code. This requires the initial state of
// the QR Code to be black at function modules and white at codeword modules (including unused remainder bits).
static void drawCodewords(const uint8_t data[], int dataLen, uint8_t qrcode[], int qrsize) {
static void drawCodewords(const uint8_t data[], int dataLen, uint8_t qrcode[]) {
int qrsize = qrcodegen_getSize(qrcode);
int i = 0; // Bit index into the data
// Do the funny zigzag scan
for (int right = qrsize - 1; right >= 1; right -= 2) { // Index of right column in each column pair
@ -657,8 +658,9 @@ static void drawCodewords(const uint8_t data[], int dataLen, uint8_t qrcode[], i
// properties, calling applyMask(..., m) twice with the same value is equivalent to no change at all.
// This means it is possible to apply a mask, undo it, and try another mask. Note that a final
// well-formed QR Code symbol needs exactly one mask applied (not zero, not two, etc.).
static void applyMask(const uint8_t functionModules[], uint8_t qrcode[], int qrsize, enum qrcodegen_Mask mask) {
static void applyMask(const uint8_t functionModules[], uint8_t qrcode[], enum qrcodegen_Mask mask) {
assert(0 <= (int)mask && (int)mask <= 7); // Disallows qrcodegen_Mask_AUTO
int qrsize = qrcodegen_getSize(qrcode);
for (int y = 0; y < qrsize; y++) {
for (int x = 0; x < qrsize; x++) {
if (getModule(functionModules, x, y))
@ -684,7 +686,8 @@ static void applyMask(const uint8_t functionModules[], uint8_t qrcode[], int qrs
// Calculates and returns the penalty score based on state of the given QR Code's current modules.
// This is used by the automatic mask choice algorithm to find the mask pattern that yields the lowest score.
static long getPenaltyScore(const uint8_t qrcode[], int qrsize) {
static long getPenaltyScore(const uint8_t qrcode[]) {
int qrsize = qrcodegen_getSize(qrcode);
long result = 0;
// Adjacent modules in row having same color