285 lines
9.6 KiB
C++
285 lines
9.6 KiB
C++
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#define _CRT_SECURE_NO_WARNINGS
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#include "shape-description.h"
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namespace msdfgen {
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int readCharF(FILE *input) {
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int c = '\0';
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do {
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c = fgetc(input);
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} while (c == ' ' || c == '\t' || c == '\r' || c == '\n');
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return c;
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}
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int readCharS(const char **input) {
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int c = '\0';
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do {
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c = *(*input)++;
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} while (c == ' ' || c == '\t' || c == '\r' || c == '\n');
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if (!c) {
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--c;
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return EOF;
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}
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return c;
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}
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int readCoordF(FILE *input, Point2 &coord) {
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return fscanf(input, "%lf,%lf", &coord.x, &coord.y);
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}
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int readCoordS(const char **input, Point2 &coord) {
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int read = 0;
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int result = sscanf(*input, "%lf,%lf%n", &coord.x, &coord.y, &read);
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*input += read;
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return result;
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}
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static bool writeCoord(FILE *output, Point2 coord) {
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fprintf(output, "%.12g, %.12g", coord.x, coord.y);
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return true;
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}
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template <typename T, int (*readChar)(T *), int (*readCoord)(T *, Point2 &)>
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static int readControlPoints(T *input, Point2 *output) {
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int result = readCoord(input, output[0]);
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if (result == 2) {
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switch (readChar(input)) {
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case ')':
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return 1;
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case ';':
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break;
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default:
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return -1;
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}
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result = readCoord(input, output[1]);
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if (result == 2 && readChar(input) == ')')
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return 2;
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} else if (result != 1 && readChar(input) == ')')
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return 0;
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return -1;
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}
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template <typename T, int (*readChar)(T *), int (*readCoord)(T *, Point2 &)>
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static bool readContour(T *input, Contour &output, const Point2 *first, int terminator, bool &colorsSpecified) {
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Point2 p[4], start;
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if (first)
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p[0] = *first;
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else {
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int result = readCoord(input, p[0]);
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if (result != 2)
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return result != 1 && readChar(input) == terminator;
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}
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start = p[0];
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int c = '\0';
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while ((c = readChar(input)) != terminator) {
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if (c != ';')
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return false;
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EdgeColor color = WHITE;
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int result = readCoord(input, p[1]);
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if (result == 2) {
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output.addEdge(EdgeHolder(p[0], p[1], color));
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p[0] = p[1];
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continue;
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} else if (result == 1)
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return false;
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else {
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int controlPoints = 0;
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switch ((c = readChar(input))) {
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case '#':
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output.addEdge(EdgeHolder(p[0], start, color));
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p[0] = start;
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continue;
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case ';':
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goto FINISH_EDGE;
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case '(':
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goto READ_CONTROL_POINTS;
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case 'C': case 'c':
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color = CYAN;
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colorsSpecified = true;
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break;
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case 'M': case 'm':
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color = MAGENTA;
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colorsSpecified = true;
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break;
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case 'Y': case 'y':
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color = YELLOW;
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colorsSpecified = true;
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break;
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case 'W': case 'w':
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color = WHITE;
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colorsSpecified = true;
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break;
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default:
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return c == terminator;
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}
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switch (readChar(input)) {
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case ';':
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goto FINISH_EDGE;
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case '(':
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READ_CONTROL_POINTS:
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if ((controlPoints = readControlPoints<T, readChar, readCoord>(input, p+1)) < 0)
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return false;
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break;
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default:
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return false;
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}
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if (readChar(input) != ';')
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return false;
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FINISH_EDGE:
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result = readCoord(input, p[1+controlPoints]);
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if (result != 2) {
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if (result == 1)
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return false;
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else {
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if (readChar(input) == '#')
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p[1+controlPoints] = start;
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else
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return false;
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}
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}
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switch (controlPoints) {
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case 0:
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output.addEdge(EdgeHolder(p[0], p[1], color));
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p[0] = p[1];
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continue;
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case 1:
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output.addEdge(EdgeHolder(p[0], p[1], p[2], color));
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p[0] = p[2];
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continue;
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case 2:
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output.addEdge(EdgeHolder(p[0], p[1], p[2], p[3], color));
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p[0] = p[3];
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continue;
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}
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}
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}
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return true;
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}
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bool readShapeDescription(FILE *input, Shape &output, bool *colorsSpecified) {
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bool locColorsSpec = false;
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output.contours.clear();
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output.inverseYAxis = false;
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Point2 p;
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int result = readCoordF(input, p);
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if (result == 2) {
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return readContour<FILE, readCharF, readCoordF>(input, output.addContour(), &p, EOF, locColorsSpec);
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} else if (result == 1)
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return false;
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else {
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int c = readCharF(input);
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if (c == '@') {
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char after = '\0';
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if (fscanf(input, "invert-y%c", &after) != 1)
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return feof(input) != 0;
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output.inverseYAxis = true;
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c = after;
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if (c == ' ' || c == '\t' || c == '\r' || c == '\n')
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c = readCharF(input);
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}
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for (; c == '{'; c = readCharF(input))
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if (!readContour<FILE, readCharF, readCoordF>(input, output.addContour(), NULL, '}', locColorsSpec))
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return false;
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if (colorsSpecified)
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*colorsSpecified = locColorsSpec;
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return c == EOF && feof(input);
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}
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}
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bool readShapeDescription(const char *input, Shape &output, bool *colorsSpecified) {
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bool locColorsSpec = false;
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output.contours.clear();
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output.inverseYAxis = false;
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Point2 p;
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int result = readCoordS(&input, p);
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if (result == 2) {
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return readContour<const char *, readCharS, readCoordS>(&input, output.addContour(), &p, EOF, locColorsSpec);
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} else if (result == 1)
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return false;
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else {
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int c = readCharS(&input);
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if (c == '@') {
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for (int i = 0; i < (int) sizeof("invert-y")-1; ++i)
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if (input[i] != "invert-y"[i])
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return false;
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output.inverseYAxis = true;
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input += sizeof("invert-y")-1;
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c = readCharS(&input);
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}
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for (; c == '{'; c = readCharS(&input))
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if (!readContour<const char *, readCharS, readCoordS>(&input, output.addContour(), NULL, '}', locColorsSpec))
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return false;
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if (colorsSpecified)
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*colorsSpecified = locColorsSpec;
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return c == EOF;
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}
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}
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static bool isColored(const Shape &shape) {
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for (std::vector<Contour>::const_iterator contour = shape.contours.begin(); contour != shape.contours.end(); ++contour)
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for (std::vector<EdgeHolder>::const_iterator edge = contour->edges.begin(); edge != contour->edges.end(); ++edge)
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if ((*edge)->color != WHITE)
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return true;
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return false;
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}
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bool writeShapeDescription(FILE *output, const Shape &shape) {
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if (!shape.validate())
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return false;
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bool writeColors = isColored(shape);
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if (shape.inverseYAxis)
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fprintf(output, "@invert-y\n");
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for (std::vector<Contour>::const_iterator contour = shape.contours.begin(); contour != shape.contours.end(); ++contour) {
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fprintf(output, "{\n");
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if (!contour->edges.empty()) {
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for (std::vector<EdgeHolder>::const_iterator edge = contour->edges.begin(); edge != contour->edges.end(); ++edge) {
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char colorCode = '\0';
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if (writeColors) {
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switch ((*edge)->color) {
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case YELLOW: colorCode = 'y'; break;
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case MAGENTA: colorCode = 'm'; break;
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case CYAN: colorCode = 'c'; break;
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case WHITE: colorCode = 'w'; break;
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default:;
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}
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}
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if (const LinearSegment *e = dynamic_cast<const LinearSegment *>(&**edge)) {
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fprintf(output, "\t");
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writeCoord(output, e->p[0]);
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fprintf(output, ";\n");
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if (colorCode)
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fprintf(output, "\t\t%c;\n", colorCode);
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}
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if (const QuadraticSegment *e = dynamic_cast<const QuadraticSegment *>(&**edge)) {
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fprintf(output, "\t");
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writeCoord(output, e->p[0]);
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fprintf(output, ";\n\t\t");
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if (colorCode)
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fprintf(output, "%c", colorCode);
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fprintf(output, "(");
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writeCoord(output, e->p[1]);
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fprintf(output, ");\n");
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}
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if (const CubicSegment *e = dynamic_cast<const CubicSegment *>(&**edge)) {
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fprintf(output, "\t");
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writeCoord(output, e->p[0]);
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fprintf(output, ";\n\t\t");
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if (colorCode)
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fprintf(output, "%c", colorCode);
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fprintf(output, "(");
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writeCoord(output, e->p[1]);
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fprintf(output, "; ");
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writeCoord(output, e->p[2]);
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fprintf(output, ");\n");
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}
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}
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fprintf(output, "\t#\n");
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}
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fprintf(output, "}\n");
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}
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return true;
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}
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}
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