449 lines
8.7 KiB
C
449 lines
8.7 KiB
C
// 6 september 2015
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#include "uipriv_unix.h"
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struct uiDrawPath {
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GArray *pieces;
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uiDrawFillMode fillMode;
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gboolean ended;
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};
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struct piece {
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int type;
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double d[8];
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int b;
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};
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enum {
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newFigure,
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newFigureArc,
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lineTo,
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arcTo,
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bezierTo,
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closeFigure,
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addRect,
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};
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uiDrawPath *uiDrawNewPath(uiDrawFillMode mode)
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{
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uiDrawPath *p;
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p = uiNew(uiDrawPath);
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p->pieces = g_array_new(FALSE, TRUE, sizeof (struct piece));
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p->fillMode = mode;
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return p;
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}
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void uiDrawFreePath(uiDrawPath *p)
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{
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g_array_free(p->pieces, TRUE);
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uiFree(p);
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}
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static void add(uiDrawPath *p, struct piece *piece)
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{
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if (p->ended)
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complain("path ended in add()");
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g_array_append_vals(p->pieces, piece, 1);
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}
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void uiDrawPathNewFigure(uiDrawPath *p, double x, double y)
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{
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struct piece piece;
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piece.type = newFigure;
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piece.d[0] = x;
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piece.d[1] = y;
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add(p, &piece);
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}
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void uiDrawPathNewFigureWithArc(uiDrawPath *p, double xCenter, double yCenter, double radius, double startAngle, double sweep, int negative)
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{
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struct piece piece;
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if (sweep > 2 * M_PI)
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sweep = 2 * M_PI;
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piece.type = newFigureArc;
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piece.d[0] = xCenter;
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piece.d[1] = yCenter;
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piece.d[2] = radius;
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piece.d[3] = startAngle;
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piece.d[4] = sweep;
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piece.b = negative;
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add(p, &piece);
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}
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void uiDrawPathLineTo(uiDrawPath *p, double x, double y)
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{
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struct piece piece;
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piece.type = lineTo;
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piece.d[0] = x;
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piece.d[1] = y;
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add(p, &piece);
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}
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void uiDrawPathArcTo(uiDrawPath *p, double xCenter, double yCenter, double radius, double startAngle, double sweep, int negative)
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{
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struct piece piece;
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if (sweep > 2 * M_PI)
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sweep = 2 * M_PI;
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piece.type = arcTo;
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piece.d[0] = xCenter;
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piece.d[1] = yCenter;
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piece.d[2] = radius;
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piece.d[3] = startAngle;
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piece.d[4] = sweep;
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piece.b = negative;
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add(p, &piece);
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}
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void uiDrawPathBezierTo(uiDrawPath *p, double c1x, double c1y, double c2x, double c2y, double endX, double endY)
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{
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struct piece piece;
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piece.type = bezierTo;
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piece.d[0] = c1x;
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piece.d[1] = c1y;
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piece.d[2] = c2x;
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piece.d[3] = c2y;
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piece.d[4] = endX;
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piece.d[5] = endY;
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add(p, &piece);
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}
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void uiDrawPathCloseFigure(uiDrawPath *p)
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{
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struct piece piece;
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piece.type = closeFigure;
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add(p, &piece);
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}
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void uiDrawPathAddRectangle(uiDrawPath *p, double x, double y, double width, double height)
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{
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struct piece piece;
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piece.type = addRect;
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piece.d[0] = x;
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piece.d[1] = y;
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piece.d[2] = width;
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piece.d[3] = height;
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add(p, &piece);
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}
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void uiDrawPathEnd(uiDrawPath *p)
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{
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p->ended = TRUE;
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}
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static void runPath(uiDrawPath *p, cairo_t *cr)
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{
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guint i;
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struct piece *piece;
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void (*arc)(cairo_t *, double, double, double, double, double);
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if (!p->ended)
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complain("path not ended in runPath()");
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cairo_new_path(cr);
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for (i = 0; i < p->pieces->len; i++) {
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piece = &g_array_index(p->pieces, struct piece, i);
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switch (piece->type) {
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case newFigure:
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cairo_move_to(cr, piece->d[0], piece->d[1]);
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break;
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case newFigureArc:
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cairo_new_sub_path(cr);
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// fall through
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case arcTo:
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arc = cairo_arc;
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if (piece->b)
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arc = cairo_arc_negative;
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(*arc)(cr,
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piece->d[0],
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piece->d[1],
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piece->d[2],
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piece->d[3],
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piece->d[3] + piece->d[4]);
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break;
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case lineTo:
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cairo_line_to(cr, piece->d[0], piece->d[1]);
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break;
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case bezierTo:
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cairo_curve_to(cr,
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piece->d[0],
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piece->d[1],
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piece->d[2],
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piece->d[3],
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piece->d[4],
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piece->d[5]);
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break;
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case closeFigure:
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cairo_close_path(cr);
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break;
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case addRect:
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cairo_rectangle(cr,
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piece->d[0],
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piece->d[1],
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piece->d[2],
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piece->d[3]);
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break;
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}
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}
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}
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struct uiDrawContext {
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cairo_t *cr;
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};
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uiDrawContext *newContext(cairo_t *cr)
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{
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uiDrawContext *c;
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c = uiNew(uiDrawContext);
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c->cr = cr;
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return c;
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}
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void freeContext(uiDrawContext *c)
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{
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uiFree(c);
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}
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static cairo_pattern_t *mkbrush(uiDrawBrush *b)
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{
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cairo_pattern_t *pat;
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size_t i;
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switch (b->Type) {
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case uiDrawBrushTypeSolid:
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pat = cairo_pattern_create_rgba(b->R, b->G, b->B, b->A);
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break;
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case uiDrawBrushTypeLinearGradient:
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pat = cairo_pattern_create_linear(b->X0, b->Y0, b->X1, b->Y1);
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break;
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case uiDrawBrushTypeRadialGradient:
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// make the start circle radius 0 to make it a point
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pat = cairo_pattern_create_radial(
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b->X0, b->Y0, 0,
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b->X1, b->Y1, b->OuterRadius);
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break;
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// case uiDrawBrushTypeImage:
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}
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if (cairo_pattern_status(pat) != CAIRO_STATUS_SUCCESS)
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complain("error creating pattern in mkbrush(): %s",
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cairo_status_to_string(cairo_pattern_status(pat)));
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switch (b->Type) {
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case uiDrawBrushTypeLinearGradient:
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case uiDrawBrushTypeRadialGradient:
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for (i = 0; i < b->NumStops; i++)
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cairo_pattern_add_color_stop_rgba(pat,
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b->Stops[i].Pos,
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b->Stops[i].R,
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b->Stops[i].G,
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b->Stops[i].B,
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b->Stops[i].A);
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}
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return pat;
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}
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void uiDrawStroke(uiDrawContext *c, uiDrawPath *path, uiDrawBrush *b, uiDrawStrokeParams *p)
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{
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cairo_pattern_t *pat;
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runPath(path, c->cr);
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pat = mkbrush(b);
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cairo_set_source(c->cr, pat);
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switch (p->Cap) {
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case uiDrawLineCapFlat:
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cairo_set_line_cap(c->cr, CAIRO_LINE_CAP_BUTT);
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break;
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case uiDrawLineCapRound:
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cairo_set_line_cap(c->cr, CAIRO_LINE_CAP_ROUND);
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break;
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case uiDrawLineCapSquare:
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cairo_set_line_cap(c->cr, CAIRO_LINE_CAP_SQUARE);
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break;
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}
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switch (p->Join) {
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case uiDrawLineJoinMiter:
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cairo_set_line_join(c->cr, CAIRO_LINE_JOIN_MITER);
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cairo_set_miter_limit(c->cr, p->MiterLimit);
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break;
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case uiDrawLineJoinRound:
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cairo_set_line_join(c->cr, CAIRO_LINE_JOIN_ROUND);
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break;
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case uiDrawLineJoinBevel:
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cairo_set_line_join(c->cr, CAIRO_LINE_JOIN_BEVEL);
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break;
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}
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cairo_set_line_width(c->cr, p->Thickness);
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cairo_set_dash(c->cr, p->Dashes, p->NumDashes, p->DashPhase);
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cairo_stroke(c->cr);
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cairo_pattern_destroy(pat);
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}
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void uiDrawFill(uiDrawContext *c, uiDrawPath *path, uiDrawBrush *b)
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{
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cairo_pattern_t *pat;
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runPath(path, c->cr);
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pat = mkbrush(b);
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cairo_set_source(c->cr, pat);
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switch (path->fillMode) {
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case uiDrawFillModeWinding:
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cairo_set_fill_rule(c->cr, CAIRO_FILL_RULE_WINDING);
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break;
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case uiDrawFillModeAlternate:
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cairo_set_fill_rule(c->cr, CAIRO_FILL_RULE_EVEN_ODD);
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break;
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}
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cairo_fill(c->cr);
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cairo_pattern_destroy(pat);
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}
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static void m2c(uiDrawMatrix *m, cairo_matrix_t *c)
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{
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c->xx = m->M11;
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c->yx = m->M12;
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c->xy = m->M21;
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c->yy = m->M22;
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c->x0 = m->M31;
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c->y0 = m->M32;
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}
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static void c2m(cairo_matrix_t *c, uiDrawMatrix *m)
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{
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m->M11 = c->xx;
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m->M12 = c->yx;
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m->M21 = c->xy;
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m->M22 = c->yy;
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m->M31 = c->x0;
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m->M32 = c->y0;
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}
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void uiDrawMatrixSetIdentity(uiDrawMatrix *m)
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{
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setIdentity(m);
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}
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void uiDrawMatrixTranslate(uiDrawMatrix *m, double x, double y)
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{
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cairo_matrix_t c;
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m2c(m, &c);
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cairo_matrix_translate(&c, x, y);
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c2m(&c, m);
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}
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void uiDrawMatrixScale(uiDrawMatrix *m, double xCenter, double yCenter, double x, double y)
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{
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cairo_matrix_t c;
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double xt, yt;
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m2c(m, &c);
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// TODO explain why the translation must come first
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xt = x;
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yt = y;
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scaleCenter(xCenter, yCenter, &xt, &yt);
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cairo_matrix_translate(&c, xt, yt);
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cairo_matrix_scale(&c, x, y);
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// TODO undo the translation?
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c2m(&c, m);
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}
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void uiDrawMatrixRotate(uiDrawMatrix *m, double x, double y, double amount)
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{
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cairo_matrix_t c;
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m2c(m, &c);
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cairo_matrix_translate(&c, x, y);
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cairo_matrix_rotate(&c, amount);
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// TODO undo the translation? also cocoa backend
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cairo_matrix_translate(&c, -x, -y);
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c2m(&c, m);
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}
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void uiDrawMatrixSkew(uiDrawMatrix *m, double x, double y, double xamount, double yamount)
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{
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fallbackSkew(m, x, y, xamount, yamount);
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}
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void uiDrawMatrixMultiply(uiDrawMatrix *dest, uiDrawMatrix *src)
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{
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cairo_matrix_t c;
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cairo_matrix_t d;
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m2c(dest, &c);
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m2c(src, &d);
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cairo_matrix_multiply(&c, &c, &d);
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c2m(&c, dest);
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}
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int uiDrawMatrixInvertible(uiDrawMatrix *m)
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{
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cairo_matrix_t c;
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m2c(m, &c);
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return cairo_matrix_invert(&c) == CAIRO_STATUS_SUCCESS;
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}
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int uiDrawMatrixInvert(uiDrawMatrix *m)
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{
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cairo_matrix_t c;
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m2c(m, &c);
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if (cairo_matrix_invert(&c) != CAIRO_STATUS_SUCCESS)
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return 0;
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c2m(&c, m);
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return 1;
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}
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void uiDrawMatrixTransformPoint(uiDrawMatrix *m, double *x, double *y)
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{
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cairo_matrix_t c;
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m2c(m, &c);
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cairo_matrix_transform_point(&c, x, y);
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}
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void uiDrawMatrixTransformSize(uiDrawMatrix *m, double *x, double *y)
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{
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cairo_matrix_t c;
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m2c(m, &c);
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cairo_matrix_transform_distance(&c, x, y);
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}
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void uiDrawTransform(uiDrawContext *c, uiDrawMatrix *m)
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{
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cairo_matrix_t cm;
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m2c(m, &cm);
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cairo_transform(c->cr, &cm);
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}
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void uiDrawClip(uiDrawContext *c, uiDrawPath *path)
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{
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runPath(path, c->cr);
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switch (path->fillMode) {
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case uiDrawFillModeWinding:
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cairo_set_fill_rule(c->cr, CAIRO_FILL_RULE_WINDING);
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break;
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case uiDrawFillModeAlternate:
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cairo_set_fill_rule(c->cr, CAIRO_FILL_RULE_EVEN_ODD);
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break;
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}
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cairo_clip(c->cr);
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}
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void uiDrawSave(uiDrawContext *c)
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{
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cairo_save(c->cr);
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}
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void uiDrawRestore(uiDrawContext *c)
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{
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cairo_restore(c->cr);
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}
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