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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
#ifdef HAVE_NETINET_IN_H
# include <netinet/in.h>
#elif defined XP_WIN
# include <winsock2.h>
#endif
#include <string.h>
#include "YuvStamper.h"
#include "mozilla/Sprintf.h"
typedef uint32_t UINT4; // Needed for r_crc32() call
extern "C" {
#include "r_crc32.h"
}
namespace mozilla {
#define ON_5 0x20
#define ON_4 0x10
#define ON_3 0x08
#define ON_2 0x04
#define ON_1 0x02
#define ON_0 0x01
/*
0, 0, 1, 1, 0, 0,
0, 1, 0, 0, 1, 0,
1, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 1,
0, 1, 0, 0, 1, 0,
0, 0, 1, 1, 0, 0
*/
static unsigned char DIGIT_0[] = {ON_3 | ON_2, ON_4 | ON_1, ON_5 | ON_0,
ON_5 | ON_0, ON_5 | ON_0, ON_4 | ON_1,
ON_3 | ON_2};
/*
0, 0, 0, 1, 0, 0,
0, 0, 0, 1, 0, 0,
0, 0, 0, 1, 0, 0,
0, 0, 0, 1, 0, 0,
0, 0, 0, 1, 0, 0,
0, 0, 0, 1, 0, 0,
0, 0, 0, 1, 0, 0,
*/
static unsigned char DIGIT_1[] = {ON_2, ON_2, ON_2, ON_2, ON_2, ON_2, ON_2};
/*
1, 1, 1, 1, 1, 0,
0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 0, 1,
0, 1, 1, 1, 1, 0,
1, 0, 0, 0, 0, 0,
1, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 1,
*/
static unsigned char DIGIT_2[] = {
ON_5 | ON_4 | ON_3 | ON_2 | ON_1, ON_0, ON_0,
ON_4 | ON_3 | ON_2 | ON_1, ON_5, ON_5,
ON_4 | ON_3 | ON_2 | ON_1 | ON_0,
};
/*
1, 1, 1, 1, 1, 0,
0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 0, 1,
0, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 0, 1,
1, 1, 1, 1, 1, 0,
*/
static unsigned char DIGIT_3[] = {
ON_5 | ON_4 | ON_3 | ON_2 | ON_1, ON_0, ON_0,
ON_4 | ON_3 | ON_2 | ON_1 | ON_0, ON_0, ON_0,
ON_5 | ON_4 | ON_3 | ON_2 | ON_1,
};
/*
0, 1, 0, 0, 0, 1,
0, 1, 0, 0, 0, 1,
0, 1, 0, 0, 0, 1,
0, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 0, 1
*/
static unsigned char DIGIT_4[] = {
ON_4 | ON_0, ON_4 | ON_0, ON_4 | ON_0, ON_4 | ON_3 | ON_2 | ON_1 | ON_0,
ON_0, ON_0, ON_0,
};
/*
0, 1, 1, 1, 1, 1,
1, 0, 0, 0, 0, 0,
1, 0, 0, 0, 0, 0,
0, 1, 1, 1, 1, 0,
0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 0, 1,
1, 1, 1, 1, 1, 0,
*/
static unsigned char DIGIT_5[] = {
ON_4 | ON_3 | ON_2 | ON_1 | ON_0, ON_5, ON_5,
ON_4 | ON_3 | ON_2 | ON_1, ON_0, ON_0,
ON_5 | ON_4 | ON_3 | ON_2 | ON_1,
};
/*
0, 1, 1, 1, 1, 1,
1, 0, 0, 0, 0, 0,
1, 0, 0, 0, 0, 0,
1, 1, 1, 1, 1, 0,
1, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 1,
0, 1, 1, 1, 1, 0,
*/
static unsigned char DIGIT_6[] = {
ON_4 | ON_3 | ON_2 | ON_1 | ON_0, ON_5, ON_5,
ON_4 | ON_3 | ON_2 | ON_1, ON_5 | ON_0, ON_5 | ON_0,
ON_4 | ON_3 | ON_2 | ON_1,
};
/*
1, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 1, 0,
0, 0, 0, 1, 0, 0,
0, 0, 1, 0, 0, 0,
0, 1, 0, 0, 0, 0,
1, 0, 0, 0, 0, 0
*/
static unsigned char DIGIT_7[] = {ON_5 | ON_4 | ON_3 | ON_2 | ON_1 | ON_0,
ON_0,
ON_1,
ON_2,
ON_3,
ON_4,
ON_5};
/*
0, 1, 1, 1, 1, 1,
1, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 1,
0, 1, 1, 1, 1, 0,
1, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 1,
0, 1, 1, 1, 1, 0
*/
static unsigned char DIGIT_8[] = {
ON_4 | ON_3 | ON_2 | ON_1, ON_5 | ON_0, ON_5 | ON_0,
ON_4 | ON_3 | ON_2 | ON_1, ON_5 | ON_0, ON_5 | ON_0,
ON_4 | ON_3 | ON_2 | ON_1,
};
/*
0, 1, 1, 1, 1, 1,
1, 0, 0, 0, 0, 1,
1, 0, 0, 0, 0, 1,
0, 1, 1, 1, 1, 1,
0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 0, 1,
0, 1, 1, 1, 1, 0
*/
static unsigned char DIGIT_9[] = {
ON_4 | ON_3 | ON_2 | ON_1 | ON_0, ON_5 | ON_0, ON_5 | ON_0,
ON_4 | ON_3 | ON_2 | ON_1 | ON_0, ON_0, ON_0,
ON_4 | ON_3 | ON_2 | ON_1,
};
static unsigned char* DIGITS[] = {DIGIT_0, DIGIT_1, DIGIT_2, DIGIT_3, DIGIT_4,
DIGIT_5, DIGIT_6, DIGIT_7, DIGIT_8, DIGIT_9};
YuvStamper::YuvStamper(unsigned char* pYData, uint32_t width, uint32_t height,
uint32_t stride, uint32_t x, uint32_t y,
unsigned char symbol_width, unsigned char symbol_height)
: pYData(pYData),
mStride(stride),
mWidth(width),
mHeight(height),
mSymbolWidth(symbol_width),
mSymbolHeight(symbol_height),
mCursor(x, y) {}
bool YuvStamper::Encode(uint32_t width, uint32_t height, uint32_t stride,
unsigned char* pYData, unsigned char* pMsg,
size_t msg_len, uint32_t x, uint32_t y) {
YuvStamper stamper(pYData, width, height, stride, x, y, sBitSize, sBitSize);
// Reserve space for a checksum.
if (stamper.Capacity() < 8 * (msg_len + sizeof(uint32_t))) {
return false;
}
bool ok = false;
uint32_t crc;
unsigned char* pCrc = reinterpret_cast<unsigned char*>(&crc);
r_crc32(reinterpret_cast<char*>(pMsg), (int)msg_len, &crc);
crc = htonl(crc);
while (msg_len-- > 0) {
if (!stamper.Write8(*pMsg++)) {
return false;
}
}
// Add checksum after the message.
ok = stamper.Write8(*pCrc++) && stamper.Write8(*pCrc++) &&
stamper.Write8(*pCrc++) && stamper.Write8(*pCrc++);
return ok;
}
bool YuvStamper::Decode(uint32_t width, uint32_t height, uint32_t stride,
unsigned char* pYData, unsigned char* pMsg,
size_t msg_len, uint32_t x, uint32_t y) {
YuvStamper stamper(pYData, width, height, stride, x, y, sBitSize, sBitSize);
unsigned char* ptr = pMsg;
size_t len = msg_len;
uint32_t crc, msg_crc;
unsigned char* pCrc = reinterpret_cast<unsigned char*>(&crc);
// Account for space reserved for the checksum
if (stamper.Capacity() < 8 * (len + sizeof(uint32_t))) {
return false;
}
while (len-- > 0) {
if (!stamper.Read8(*ptr++)) {
return false;
}
}
if (!(stamper.Read8(*pCrc++) && stamper.Read8(*pCrc++) &&
stamper.Read8(*pCrc++) && stamper.Read8(*pCrc++))) {
return false;
}
r_crc32(reinterpret_cast<char*>(pMsg), (int)msg_len, &msg_crc);
return crc == htonl(msg_crc);
}
inline uint32_t YuvStamper::Capacity() {
// Enforce at least a symbol width and height offset from outer edges.
if (mCursor.y + mSymbolHeight > mHeight) {
return 0;
}
if (mCursor.x + mSymbolWidth > mWidth && !AdvanceCursor()) {
return 0;
}
// Normalize frame integral to mSymbolWidth x mSymbolHeight
uint32_t width = mWidth / mSymbolWidth;
uint32_t height = mHeight / mSymbolHeight;
uint32_t x = mCursor.x / mSymbolWidth;
uint32_t y = mCursor.y / mSymbolHeight;
return (width * height - width * y) - x;
}
bool YuvStamper::Write8(unsigned char value) {
// Encode MSB to LSB.
unsigned char mask = 0x80;
while (mask) {
if (!WriteBit(!!(value & mask))) {
return false;
}
mask >>= 1;
}
return true;
}
bool YuvStamper::WriteBit(bool one) {
// A bit is mapped to a mSymbolWidth x mSymbolHeight square of luma data
// points. Don't use ternary op.:
unsigned char value;
if (one)
value = sYOn;
else
value = sYOff;
for (uint32_t y = 0; y < mSymbolHeight; y++) {
for (uint32_t x = 0; x < mSymbolWidth; x++) {
*(pYData + (mCursor.x + x) + ((mCursor.y + y) * mStride)) = value;
}
}
return AdvanceCursor();
}
bool YuvStamper::AdvanceCursor() {
mCursor.x += mSymbolWidth;
if (mCursor.x + mSymbolWidth > mWidth) {
// move to the start of the next row if possible.
mCursor.y += mSymbolHeight;
if (mCursor.y + mSymbolHeight > mHeight) {
// end of frame, do not advance
mCursor.y -= mSymbolHeight;
mCursor.x -= mSymbolWidth;
return false;
} else {
mCursor.x = 0;
}
}
return true;
}
bool YuvStamper::Read8(unsigned char& value) {
unsigned char octet = 0;
unsigned char bit = 0;
for (int i = 8; i > 0; --i) {
if (!ReadBit(bit)) {
return false;
}
octet <<= 1;
octet |= bit;
}
value = octet;
return true;
}
bool YuvStamper::ReadBit(unsigned char& bit) {
uint32_t sum = 0;
for (uint32_t y = 0; y < mSymbolHeight; y++) {
for (uint32_t x = 0; x < mSymbolWidth; x++) {
sum += *(pYData + mStride * (mCursor.y + y) + mCursor.x + x);
}
}
// apply threshold to collected bit square
bit = (sum > (sBitThreshold * mSymbolWidth * mSymbolHeight)) ? 1 : 0;
return AdvanceCursor();
}
bool YuvStamper::WriteDigits(uint32_t value) {
char buf[20];
SprintfLiteral(buf, "%.5u", value);
size_t size = strlen(buf);
if (Capacity() < size) {
return false;
}
for (size_t i = 0; i < size; ++i) {
if (!WriteDigit(buf[i] - '0')) return false;
if (!AdvanceCursor()) {
return false;
}
}
return true;
}
bool YuvStamper::WriteDigit(unsigned char digit) {
if (digit > sizeof(DIGITS) / sizeof(DIGITS[0])) return false;
unsigned char* dig = DIGITS[digit];
for (uint32_t row = 0; row < sDigitHeight; ++row) {
unsigned char mask = 0x01 << (sDigitWidth - 1);
for (uint32_t col = 0; col < sDigitWidth; ++col, mask >>= 1) {
if (dig[row] & mask) {
for (uint32_t xx = 0; xx < sPixelSize; ++xx) {
for (uint32_t yy = 0; yy < sPixelSize; ++yy) {
WritePixel(pYData, mCursor.x + (col * sPixelSize) + xx,
mCursor.y + (row * sPixelSize) + yy);
}
}
}
}
}
return true;
}
void YuvStamper::WritePixel(unsigned char* data, uint32_t x, uint32_t y) {
unsigned char* ptr = &data[y * mStride + x];
if (*ptr > sLumaThreshold)
*ptr = sLumaMin;
else
*ptr = sLumaMax;
}
} // namespace mozilla.