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Copy pathProjection.hpp
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253 lines (236 loc) · 6.04 KB
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#ifndef MINICAP_PROJECTION_HPP
#define MINICAP_PROJECTION_HPP
#include <cmath>
#include <ostream>
class Projection {
public:
class Parser {
public:
Parser(): mState(real_width_start) {
}
bool
parse(Projection& proj, const char* lo, const char* hi) {
consume: while (lo < hi) {
switch (mState) {
case real_width_start:
if (isDigit(*lo)) {
proj.realWidth += (*lo - 48);
mState = real_width_continued;
lo += 1;
goto consume;
}
return false;
case real_width_continued:
if (isDigit(*lo)) {
proj.realWidth *= 10;
proj.realWidth += (*lo - 48);
lo += 1;
goto consume;
}
if (*lo == 'x') {
mState = real_height_start;
lo += 1;
goto consume;
}
return false;
case real_height_start:
if (isDigit(*lo)) {
proj.realHeight += (*lo - 48);
mState = real_height_continued;
lo += 1;
goto consume;
}
return false;
case real_height_continued:
if (isDigit(*lo)) {
proj.realHeight *= 10;
proj.realHeight += (*lo - 48);
lo += 1;
goto consume;
}
if (*lo == '@') {
mState = virtual_width_start;
lo += 1;
goto consume;
}
return false;
case virtual_width_start:
if (isDigit(*lo)) {
proj.virtualWidth += (*lo - 48);
mState = virtual_width_continued;
lo += 1;
goto consume;
}
return false;
case virtual_width_continued:
if (isDigit(*lo)) {
proj.virtualWidth *= 10;
proj.virtualWidth += (*lo - 48);
lo += 1;
goto consume;
}
if (*lo == 'x') {
mState = virtual_height_start;
lo += 1;
goto consume;
}
return false;
case virtual_height_start:
if (isDigit(*lo)) {
proj.virtualHeight += (*lo - 48);
mState = virtual_height_continued;
lo += 1;
goto consume;
}
return false;
case virtual_height_continued:
if (isDigit(*lo)) {
proj.virtualHeight *= 10;
proj.virtualHeight += (*lo - 48);
lo += 1;
goto consume;
}
if (*lo == '/') {
mState = rotation_start;
lo += 1;
goto consume;
}
return false;
case rotation_start:
if (*lo == '0') {
proj.rotation = 0;
mState = satisfied;
lo += 1;
goto consume;
}
if (*lo == '9') {
mState = rotation_90_2;
lo += 1;
goto consume;
}
if (*lo == '1') {
mState = rotation_180_2;
lo += 1;
goto consume;
}
if (*lo == '2') {
mState = rotation_270_2;
lo += 1;
goto consume;
}
return false;
case rotation_90_2:
if (*lo == '0') {
proj.rotation = 1;
mState = satisfied;
lo += 1;
goto consume;
}
return false;
case rotation_180_2:
if (*lo == '8') {
mState = rotation_180_3;
lo += 1;
goto consume;
}
return false;
case rotation_180_3:
if (*lo == '0') {
proj.rotation = 2;
mState = satisfied;
lo += 1;
goto consume;
}
return false;
case rotation_270_2:
if (*lo == '7') {
mState = rotation_270_3;
lo += 1;
goto consume;
}
return false;
case rotation_270_3:
if (*lo == '0') {
proj.rotation = 3;
mState = satisfied;
lo += 1;
goto consume;
}
return false;
case satisfied:
return false;
}
}
return mState == satisfied;
}
private:
enum State {
real_width_start,
real_width_continued,
real_height_start,
real_height_continued,
virtual_width_start,
virtual_width_continued,
virtual_height_start,
virtual_height_continued,
rotation_start,
rotation_90_2,
rotation_180_2,
rotation_180_3,
rotation_270_2,
rotation_270_3,
satisfied,
};
State mState;
inline bool
isDigit(int input) {
return input >= '0' && input <= '9';
}
};
const uint32_t MAX_WIDTH = 10000;
const uint32_t MAX_HEIGHT = 10000;
uint32_t realWidth;
uint32_t realHeight;
uint32_t virtualWidth;
uint32_t virtualHeight;
uint32_t rotation;
Projection()
: realWidth(0),
realHeight(0),
virtualWidth(0),
virtualHeight(0),
rotation(0) {
}
void
forceMaximumSize() {
if (virtualWidth > realWidth) {
virtualWidth = realWidth;
}
if (virtualHeight > realHeight) {
virtualHeight = realHeight;
}
}
void
forceAspectRatio() {
double aspect = static_cast<double>(realWidth) / static_cast<double>(realHeight);
if (virtualHeight > (uint32_t) (virtualWidth / aspect)) {
virtualHeight = static_cast<uint32_t>(round(virtualWidth / aspect));
}
else {
virtualWidth = static_cast<uint32_t>(round(virtualHeight * aspect));
}
}
bool
valid() {
return realWidth > 0 && realHeight > 0 &&
virtualWidth > 0 && virtualHeight > 0 &&
virtualWidth <= realWidth && virtualHeight <= realHeight;
}
friend std::ostream&
operator<< (std::ostream& stream, const Projection& proj) {
stream << proj.realWidth << 'x' << proj.realHeight << '@'
<< proj.virtualWidth << 'x' << proj.virtualHeight << '/' << proj.rotation;
return stream;
}
};
#endif