Split unix/draw.c into a bunch of smaller files.
This commit is contained in:
Pietro Gagliardi
parent
45dd9416d3
commit
4e53551e06
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@ -11,6 +11,9 @@ CFILES += \
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unix/control.c \
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unix/datetimepicker.c \
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unix/draw.c \
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unix/drawmatrix.c \
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unix/drawpath.c \
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unix/drawtext.c \
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unix/entry.c \
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unix/fontbutton.c \
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unix/group.c \
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@ -30,6 +33,7 @@ CFILES += \
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unix/window.c
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HFILES += \
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unix/draw.h \
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unix/uipriv_unix.h
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# TODO split into a separate file or put in GNUmakefile.libui somehow?
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666
unix/draw.c
666
unix/draw.c
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@ -1,200 +1,6 @@
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// 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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#include "draw.h"
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uiDrawContext *newContext(cairo_t *cr)
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{
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@ -290,7 +96,7 @@ void uiDrawFill(uiDrawContext *c, uiDrawPath *path, uiDrawBrush *b)
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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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switch (pathFillMode(path)) {
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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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@ -302,131 +108,10 @@ void uiDrawFill(uiDrawContext *c, uiDrawPath *path, uiDrawBrush *b)
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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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switch (pathFillMode(path)) {
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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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@ -436,348 +121,3 @@ void uiDrawClip(uiDrawContext *c, uiDrawPath *path)
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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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// TODO split everything after this into a drawtext.c
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struct uiDrawFontFamilies {
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PangoFontFamily **f;
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int n;
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};
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uiDrawFontFamilies *uiDrawListFontFamilies(void)
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{
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uiDrawFontFamilies *ff;
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PangoFontMap *map;
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ff = uiNew(uiDrawFontFamilies);
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map = pango_cairo_font_map_get_default();
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pango_font_map_list_families(map, &(ff->f), &(ff->n));
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// do not free map; it's a shared resource
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return ff;
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}
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uintmax_t uiDrawFontFamiliesNumFamilies(uiDrawFontFamilies *ff)
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{
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return ff->n;
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}
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char *uiDrawFontFamiliesFamily(uiDrawFontFamilies *ff, uintmax_t n)
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{
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PangoFontFamily *f;
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f = ff->f[n];
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return uiUnixStrdupText(pango_font_family_get_name(f));
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}
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void uiDrawFreeFontFamilies(uiDrawFontFamilies *ff)
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{
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g_free(ff->f);
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uiFree(ff);
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}
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struct uiDrawTextFont {
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PangoFont *f;
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};
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uiDrawTextFont *mkTextFont(PangoFont *f, gboolean ref)
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{
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uiDrawTextFont *font;
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font = uiNew(uiDrawTextFont);
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font->f = f;
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if (ref)
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g_object_ref(font->f);
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return font;
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}
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static const PangoWeight pangoWeights[] = {
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[uiDrawTextWeightThin] = PANGO_WEIGHT_THIN,
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[uiDrawTextWeightUltraLight] = PANGO_WEIGHT_ULTRALIGHT,
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[uiDrawTextWeightLight] = PANGO_WEIGHT_LIGHT,
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[uiDrawTextWeightBook] = PANGO_WEIGHT_BOOK,
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[uiDrawTextWeightNormal] = PANGO_WEIGHT_NORMAL,
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[uiDrawTextWeightMedium] = PANGO_WEIGHT_MEDIUM,
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[uiDrawTextWeightSemiBold] = PANGO_WEIGHT_SEMIBOLD,
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[uiDrawTextWeightBold] = PANGO_WEIGHT_BOLD,
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[uiDrawTextWeightUtraBold] = PANGO_WEIGHT_ULTRABOLD,
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[uiDrawTextWeightHeavy] = PANGO_WEIGHT_HEAVY,
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[uiDrawTextWeightUltraHeavy] = PANGO_WEIGHT_ULTRAHEAVY,
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};
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static const PangoStyle pangoItalics[] = {
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[uiDrawTextItalicNormal] = PANGO_STYLE_NORMAL,
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[uiDrawTextItalicOblique] = PANGO_STYLE_OBLIQUE,
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[uiDrawTextItalicItalic] = PANGO_STYLE_ITALIC,
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};
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static const PangoStretch pangoStretches[] = {
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[uiDrawTextStretchUltraCondensed] = PANGO_STRETCH_ULTRA_CONDENSED,
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[uiDrawTextStretchExtraCondensed] = PANGO_STRETCH_EXTRA_CONDENSED,
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[uiDrawTextStretchCondensed] = PANGO_STRETCH_CONDENSED,
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[uiDrawTextStretchSemiCondensed] = PANGO_STRETCH_SEMI_CONDENSED,
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[uiDrawTextStretchNormal] = PANGO_STRETCH_NORMAL,
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[uiDrawTextStretchSemiExpanded] = PANGO_STRETCH_SEMI_EXPANDED,
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[uiDrawTextStretchExpanded] = PANGO_STRETCH_EXPANDED,
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[uiDrawTextStretchExtraExpanded] = PANGO_STRETCH_EXTRA_EXPANDED,
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[uiDrawTextStretchUltraExpanded] = PANGO_STRETCH_ULTRA_EXPANDED,
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};
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// we need a context for a few things
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// the documentation suggests creating cairo_t-specific, GdkScreen-specific, or even GtkWidget-specific contexts, but we can't really do that because we want our uiDrawTextFonts and uiDrawTextLayouts to be context-independent
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// so this will have to do
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// TODO really see if there's a better way instead; what do GDK and GTK+ do internally? gdk_pango_context_get()?
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#define mkGenericPangoCairoContext() (pango_font_map_create_context(pango_cairo_font_map_get_default()))
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PangoFont *pangoDescToPangoFont(PangoFontDescription *pdesc)
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{
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PangoFont *f;
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PangoContext *context;
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// in this case, the context is necessary for the metrics to be correct
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context = mkGenericPangoCairoContext();
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f = pango_font_map_load_font(pango_cairo_font_map_get_default(), context, pdesc);
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if (f == NULL) {
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// TODO
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g_error("[libui] no match in pangoDescToPangoFont(); report to andlabs");
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}
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g_object_unref(context);
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return f;
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}
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uiDrawTextFont *uiDrawLoadClosestFont(const uiDrawTextFontDescriptor *desc)
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{
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PangoFont *f;
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PangoFontDescription *pdesc;
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//TODO PangoVariant variant;
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pdesc = pango_font_description_new();
|
||||
pango_font_description_set_family(pdesc,
|
||||
desc->Family);
|
||||
pango_font_description_set_size(pdesc,
|
||||
(gint) (desc->Size * PANGO_SCALE));
|
||||
pango_font_description_set_weight(pdesc,
|
||||
pangoWeights[desc->Weight]);
|
||||
pango_font_description_set_style(pdesc,
|
||||
pangoItalics[desc->Italic]);
|
||||
#if 0
|
||||
TODO
|
||||
variant = PANGO_VARIANT_NORMAL;
|
||||
if (desc->SmallCaps)
|
||||
variant = PANGO_VARIANT_SMALL_CAPS;
|
||||
pango_font_description_set_variant(pdesc, variant);
|
||||
#endif
|
||||
pango_font_description_set_stretch(pdesc,
|
||||
pangoStretches[desc->Stretch]);
|
||||
f = pangoDescToPangoFont(pdesc);
|
||||
pango_font_description_free(pdesc);
|
||||
return mkTextFont(f, FALSE); // we hold the initial reference; no need to ref
|
||||
}
|
||||
|
||||
void uiDrawFreeTextFont(uiDrawTextFont *font)
|
||||
{
|
||||
g_object_unref(font->f);
|
||||
uiFree(font);
|
||||
}
|
||||
|
||||
uintptr_t uiDrawTextFontHandle(uiDrawTextFont *font)
|
||||
{
|
||||
return (uintptr_t) (font->f);
|
||||
}
|
||||
|
||||
void uiDrawTextFontDescribe(uiDrawTextFont *font, uiDrawTextFontDescriptor *desc)
|
||||
{
|
||||
PangoFontDescription *pdesc;
|
||||
|
||||
// this creates a copy; we free it later
|
||||
pdesc = pango_font_describe(font->f);
|
||||
|
||||
// TODO
|
||||
|
||||
pango_font_description_free(pdesc);
|
||||
}
|
||||
|
||||
// See https://developer.gnome.org/pango/1.30/pango-Cairo-Rendering.html#pango-Cairo-Rendering.description
|
||||
// Note that we convert to double before dividing to make sure the floating-point stuff is right
|
||||
#define pangoToCairo(pango) (((double) (pango)) / PANGO_SCALE)
|
||||
#define cairoToPango(cairo) ((gint) ((cairo) * PANGO_SCALE))
|
||||
|
||||
// TODO this isn't enough; pango adds extra space to each layout
|
||||
void uiDrawTextFontGetMetrics(uiDrawTextFont *font, uiDrawTextFontMetrics *metrics)
|
||||
{
|
||||
PangoFontMetrics *pm;
|
||||
|
||||
pm = pango_font_get_metrics(font->f, NULL);
|
||||
metrics->Ascent = pangoToCairo(pango_font_metrics_get_ascent(pm));
|
||||
metrics->Descent = pangoToCairo(pango_font_metrics_get_descent(pm));
|
||||
// Pango doesn't seem to expose this :( Use 0 and hope for the best.
|
||||
metrics->Leading = 0;
|
||||
metrics->UnderlinePos = pangoToCairo(pango_font_metrics_get_underline_position(pm));
|
||||
metrics->UnderlineThickness = pangoToCairo(pango_font_metrics_get_underline_thickness(pm));
|
||||
pango_font_metrics_unref(pm);
|
||||
}
|
||||
|
||||
// note: PangoCairoLayouts are tied to a given cairo_t, so we can't store one in this device-independent structure
|
||||
struct uiDrawTextLayout {
|
||||
char *s;
|
||||
ptrdiff_t *charsToBytes;
|
||||
PangoFont *defaultFont;
|
||||
double width;
|
||||
PangoAttrList *attrs;
|
||||
};
|
||||
|
||||
static ptrdiff_t *computeCharsToBytes(const char *s)
|
||||
{
|
||||
ptrdiff_t *charsToBytes;
|
||||
glong i, charlen;
|
||||
|
||||
// we INCLUDE the null terminator as a character in the string
|
||||
// g_utf8_offset_to_pointer() doesn't stop on null terminator so this should work
|
||||
charlen = g_utf8_strlen(s, -1) + 1;
|
||||
charsToBytes = (ptrdiff_t *) uiAlloc(charlen * sizeof (ptrdiff_t), "ptrdiff_t[]");
|
||||
// TODO speed this up by not needing to scan the whole string again
|
||||
for (i = 0; i < charlen; i++)
|
||||
charsToBytes[i] = g_utf8_offset_to_pointer(s, i) - s;
|
||||
return charsToBytes;
|
||||
}
|
||||
|
||||
uiDrawTextLayout *uiDrawNewTextLayout(const char *text, uiDrawTextFont *defaultFont, double width)
|
||||
{
|
||||
uiDrawTextLayout *layout;
|
||||
|
||||
layout = uiNew(uiDrawTextLayout);
|
||||
layout->s = g_strdup(text);
|
||||
layout->charsToBytes = computeCharsToBytes(layout->s);
|
||||
layout->defaultFont = defaultFont->f;
|
||||
g_object_ref(layout->defaultFont); // retain a copy
|
||||
uiDrawTextLayoutSetWidth(layout, width);
|
||||
layout->attrs = pango_attr_list_new();
|
||||
return layout;
|
||||
}
|
||||
|
||||
void uiDrawFreeTextLayout(uiDrawTextLayout *layout)
|
||||
{
|
||||
pango_attr_list_unref(layout->attrs);
|
||||
g_object_unref(layout->defaultFont);
|
||||
uiFree(layout->charsToBytes);
|
||||
g_free(layout->s);
|
||||
uiFree(layout);
|
||||
}
|
||||
|
||||
void uiDrawTextLayoutSetWidth(uiDrawTextLayout *layout, double width)
|
||||
{
|
||||
layout->width = width;
|
||||
}
|
||||
|
||||
static void prepareLayout(uiDrawTextLayout *layout, PangoLayout *pl)
|
||||
{
|
||||
PangoFontDescription *desc;
|
||||
int width;
|
||||
|
||||
pango_layout_set_text(pl, layout->s, -1);
|
||||
|
||||
// again, this makes a copy
|
||||
desc = pango_font_describe(layout->defaultFont);
|
||||
// this is safe; the description is copied
|
||||
pango_layout_set_font_description(pl, desc);
|
||||
pango_font_description_free(desc);
|
||||
|
||||
width = cairoToPango(layout->width);
|
||||
if (layout->width < 0)
|
||||
width = -1;
|
||||
pango_layout_set_width(pl, width);
|
||||
|
||||
pango_layout_set_attributes(pl, layout->attrs);
|
||||
}
|
||||
|
||||
void uiDrawTextLayoutExtents(uiDrawTextLayout *layout, double *width, double *height)
|
||||
{
|
||||
PangoContext *context;
|
||||
PangoLayout *pl;
|
||||
PangoRectangle logical;
|
||||
|
||||
// in this case, the context is necessary to create the layout
|
||||
context = mkGenericPangoCairoContext();
|
||||
pl = pango_layout_new(context);
|
||||
// TODO g_object_unref() context?
|
||||
prepareLayout(layout, pl);
|
||||
|
||||
pango_layout_get_extents(pl, NULL, &logical);
|
||||
|
||||
g_object_unref(pl);
|
||||
|
||||
*width = pangoToCairo(logical.width);
|
||||
*height = pangoToCairo(logical.height);
|
||||
}
|
||||
|
||||
void uiDrawText(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout)
|
||||
{
|
||||
PangoLayout *pl;
|
||||
|
||||
pl = pango_cairo_create_layout(c->cr);
|
||||
prepareLayout(layout, pl);
|
||||
|
||||
cairo_move_to(c->cr, x, y);
|
||||
pango_cairo_show_layout(c->cr, pl);
|
||||
|
||||
g_object_unref(pl);
|
||||
}
|
||||
|
||||
static void addAttr(uiDrawTextLayout *layout, PangoAttribute *attr, intmax_t startChar, intmax_t endChar)
|
||||
{
|
||||
attr->start_index = layout->charsToBytes[startChar];
|
||||
attr->end_index = layout->charsToBytes[endChar];
|
||||
pango_attr_list_insert(layout->attrs, attr);
|
||||
// pango_attr_list_insert() takes attr; we don't free it
|
||||
}
|
||||
|
||||
// these attributes are only supported on 1.38 and higher; we need to support 1.36
|
||||
// use dynamic linking to make them work at least on newer systems
|
||||
// TODO warn programmers
|
||||
static PangoAttribute *(*newFGAlphaAttr)(guint16 alpha) = NULL;
|
||||
static gboolean tried138 = FALSE;
|
||||
|
||||
// note that we treat any error as "the 1.38 symbols aren't there" (and don't care if dlclose() failed)
|
||||
static void try138(void)
|
||||
{
|
||||
void *handle;
|
||||
|
||||
tried138 = TRUE;
|
||||
// dlsym() walks the dependency chain, so opening the current process should be sufficient
|
||||
handle = dlopen(NULL, RTLD_LAZY);
|
||||
if (handle == NULL)
|
||||
return;
|
||||
*((void **) (&newFGAlphaAttr)) = dlsym(handle, "pango_attr_foreground_alpha_new");
|
||||
dlclose(handle);
|
||||
}
|
||||
|
||||
void uiDrawTextLayoutSetColor(uiDrawTextLayout *layout, intmax_t startChar, intmax_t endChar, double r, double g, double b, double a)
|
||||
{
|
||||
PangoAttribute *attr;
|
||||
guint16 rr, gg, bb, aa;
|
||||
|
||||
rr = (guint16) (r * 65535);
|
||||
gg = (guint16) (g * 65535);
|
||||
bb = (guint16) (b * 65535);
|
||||
aa = (guint16) (a * 65535);
|
||||
|
||||
attr = pango_attr_foreground_new(rr, gg, bb);
|
||||
addAttr(layout, attr, startChar, endChar);
|
||||
|
||||
if (!tried138)
|
||||
try138();
|
||||
// TODO what if aa == 0?
|
||||
if (newFGAlphaAttr != NULL) {
|
||||
attr = (*newFGAlphaAttr)(aa);
|
||||
addAttr(layout, attr, startChar, endChar);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -0,0 +1,10 @@
|
|||
// 5 may 2016
|
||||
|
||||
// draw.c
|
||||
struct uiDrawContext {
|
||||
cairo_t *cr;
|
||||
};
|
||||
|
||||
// drawpath.c
|
||||
extern void runPath(uiDrawPath *p, cairo_t *cr);
|
||||
extern uiDrawFillMode pathFillMode(uiDrawPath *path);
|
||||
|
|
@ -0,0 +1,134 @@
|
|||
// 6 september 2015
|
||||
#include "uipriv_unix.h"
|
||||
#include "draw.h"
|
||||
|
||||
static void m2c(uiDrawMatrix *m, cairo_matrix_t *c)
|
||||
{
|
||||
c->xx = m->M11;
|
||||
c->yx = m->M12;
|
||||
c->xy = m->M21;
|
||||
c->yy = m->M22;
|
||||
c->x0 = m->M31;
|
||||
c->y0 = m->M32;
|
||||
}
|
||||
|
||||
static void c2m(cairo_matrix_t *c, uiDrawMatrix *m)
|
||||
{
|
||||
m->M11 = c->xx;
|
||||
m->M12 = c->yx;
|
||||
m->M21 = c->xy;
|
||||
m->M22 = c->yy;
|
||||
m->M31 = c->x0;
|
||||
m->M32 = c->y0;
|
||||
}
|
||||
|
||||
void uiDrawMatrixSetIdentity(uiDrawMatrix *m)
|
||||
{
|
||||
setIdentity(m);
|
||||
}
|
||||
|
||||
void uiDrawMatrixTranslate(uiDrawMatrix *m, double x, double y)
|
||||
{
|
||||
cairo_matrix_t c;
|
||||
|
||||
m2c(m, &c);
|
||||
cairo_matrix_translate(&c, x, y);
|
||||
c2m(&c, m);
|
||||
}
|
||||
|
||||
void uiDrawMatrixScale(uiDrawMatrix *m, double xCenter, double yCenter, double x, double y)
|
||||
{
|
||||
cairo_matrix_t c;
|
||||
double xt, yt;
|
||||
|
||||
m2c(m, &c);
|
||||
// TODO explain why the translation must come first
|
||||
xt = x;
|
||||
yt = y;
|
||||
scaleCenter(xCenter, yCenter, &xt, &yt);
|
||||
cairo_matrix_translate(&c, xt, yt);
|
||||
cairo_matrix_scale(&c, x, y);
|
||||
// TODO undo the translation?
|
||||
c2m(&c, m);
|
||||
}
|
||||
|
||||
void uiDrawMatrixRotate(uiDrawMatrix *m, double x, double y, double amount)
|
||||
{
|
||||
cairo_matrix_t c;
|
||||
|
||||
m2c(m, &c);
|
||||
cairo_matrix_translate(&c, x, y);
|
||||
cairo_matrix_rotate(&c, amount);
|
||||
// TODO undo the translation? also cocoa backend
|
||||
cairo_matrix_translate(&c, -x, -y);
|
||||
c2m(&c, m);
|
||||
}
|
||||
|
||||
void uiDrawMatrixSkew(uiDrawMatrix *m, double x, double y, double xamount, double yamount)
|
||||
{
|
||||
fallbackSkew(m, x, y, xamount, yamount);
|
||||
}
|
||||
|
||||
void uiDrawMatrixMultiply(uiDrawMatrix *dest, uiDrawMatrix *src)
|
||||
{
|
||||
cairo_matrix_t c;
|
||||
cairo_matrix_t d;
|
||||
|
||||
m2c(dest, &c);
|
||||
m2c(src, &d);
|
||||
cairo_matrix_multiply(&c, &c, &d);
|
||||
c2m(&c, dest);
|
||||
}
|
||||
|
||||
int uiDrawMatrixInvertible(uiDrawMatrix *m)
|
||||
{
|
||||
cairo_matrix_t c;
|
||||
|
||||
m2c(m, &c);
|
||||
return cairo_matrix_invert(&c) == CAIRO_STATUS_SUCCESS;
|
||||
}
|
||||
|
||||
int uiDrawMatrixInvert(uiDrawMatrix *m)
|
||||
{
|
||||
cairo_matrix_t c;
|
||||
|
||||
m2c(m, &c);
|
||||
if (cairo_matrix_invert(&c) != CAIRO_STATUS_SUCCESS)
|
||||
return 0;
|
||||
c2m(&c, m);
|
||||
return 1;
|
||||
}
|
||||
|
||||
void uiDrawMatrixTransformPoint(uiDrawMatrix *m, double *x, double *y)
|
||||
{
|
||||
cairo_matrix_t c;
|
||||
|
||||
m2c(m, &c);
|
||||
cairo_matrix_transform_point(&c, x, y);
|
||||
}
|
||||
|
||||
void uiDrawMatrixTransformSize(uiDrawMatrix *m, double *x, double *y)
|
||||
{
|
||||
cairo_matrix_t c;
|
||||
|
||||
m2c(m, &c);
|
||||
cairo_matrix_transform_distance(&c, x, y);
|
||||
}
|
||||
|
||||
void uiDrawTransform(uiDrawContext *c, uiDrawMatrix *m)
|
||||
{
|
||||
cairo_matrix_t cm;
|
||||
|
||||
m2c(m, &cm);
|
||||
cairo_transform(c->cr, &cm);
|
||||
}
|
||||
|
||||
void uiDrawSave(uiDrawContext *c)
|
||||
{
|
||||
cairo_save(c->cr);
|
||||
}
|
||||
|
||||
void uiDrawRestore(uiDrawContext *c)
|
||||
{
|
||||
cairo_restore(c->cr);
|
||||
}
|
||||
|
|
@ -0,0 +1,199 @@
|
|||
// 6 september 2015
|
||||
#include "uipriv_unix.h"
|
||||
#include "draw.h"
|
||||
|
||||
struct uiDrawPath {
|
||||
GArray *pieces;
|
||||
uiDrawFillMode fillMode;
|
||||
gboolean ended;
|
||||
};
|
||||
|
||||
struct piece {
|
||||
int type;
|
||||
double d[8];
|
||||
int b;
|
||||
};
|
||||
|
||||
enum {
|
||||
newFigure,
|
||||
newFigureArc,
|
||||
lineTo,
|
||||
arcTo,
|
||||
bezierTo,
|
||||
closeFigure,
|
||||
addRect,
|
||||
};
|
||||
|
||||
uiDrawPath *uiDrawNewPath(uiDrawFillMode mode)
|
||||
{
|
||||
uiDrawPath *p;
|
||||
|
||||
p = uiNew(uiDrawPath);
|
||||
p->pieces = g_array_new(FALSE, TRUE, sizeof (struct piece));
|
||||
p->fillMode = mode;
|
||||
return p;
|
||||
}
|
||||
|
||||
void uiDrawFreePath(uiDrawPath *p)
|
||||
{
|
||||
g_array_free(p->pieces, TRUE);
|
||||
uiFree(p);
|
||||
}
|
||||
|
||||
static void add(uiDrawPath *p, struct piece *piece)
|
||||
{
|
||||
if (p->ended)
|
||||
complain("path ended in add()");
|
||||
g_array_append_vals(p->pieces, piece, 1);
|
||||
}
|
||||
|
||||
void uiDrawPathNewFigure(uiDrawPath *p, double x, double y)
|
||||
{
|
||||
struct piece piece;
|
||||
|
||||
piece.type = newFigure;
|
||||
piece.d[0] = x;
|
||||
piece.d[1] = y;
|
||||
add(p, &piece);
|
||||
}
|
||||
|
||||
void uiDrawPathNewFigureWithArc(uiDrawPath *p, double xCenter, double yCenter, double radius, double startAngle, double sweep, int negative)
|
||||
{
|
||||
struct piece piece;
|
||||
|
||||
if (sweep > 2 * M_PI)
|
||||
sweep = 2 * M_PI;
|
||||
piece.type = newFigureArc;
|
||||
piece.d[0] = xCenter;
|
||||
piece.d[1] = yCenter;
|
||||
piece.d[2] = radius;
|
||||
piece.d[3] = startAngle;
|
||||
piece.d[4] = sweep;
|
||||
piece.b = negative;
|
||||
add(p, &piece);
|
||||
}
|
||||
|
||||
void uiDrawPathLineTo(uiDrawPath *p, double x, double y)
|
||||
{
|
||||
struct piece piece;
|
||||
|
||||
piece.type = lineTo;
|
||||
piece.d[0] = x;
|
||||
piece.d[1] = y;
|
||||
add(p, &piece);
|
||||
}
|
||||
|
||||
void uiDrawPathArcTo(uiDrawPath *p, double xCenter, double yCenter, double radius, double startAngle, double sweep, int negative)
|
||||
{
|
||||
struct piece piece;
|
||||
|
||||
if (sweep > 2 * M_PI)
|
||||
sweep = 2 * M_PI;
|
||||
piece.type = arcTo;
|
||||
piece.d[0] = xCenter;
|
||||
piece.d[1] = yCenter;
|
||||
piece.d[2] = radius;
|
||||
piece.d[3] = startAngle;
|
||||
piece.d[4] = sweep;
|
||||
piece.b = negative;
|
||||
add(p, &piece);
|
||||
}
|
||||
|
||||
void uiDrawPathBezierTo(uiDrawPath *p, double c1x, double c1y, double c2x, double c2y, double endX, double endY)
|
||||
{
|
||||
struct piece piece;
|
||||
|
||||
piece.type = bezierTo;
|
||||
piece.d[0] = c1x;
|
||||
piece.d[1] = c1y;
|
||||
piece.d[2] = c2x;
|
||||
piece.d[3] = c2y;
|
||||
piece.d[4] = endX;
|
||||
piece.d[5] = endY;
|
||||
add(p, &piece);
|
||||
}
|
||||
|
||||
void uiDrawPathCloseFigure(uiDrawPath *p)
|
||||
{
|
||||
struct piece piece;
|
||||
|
||||
piece.type = closeFigure;
|
||||
add(p, &piece);
|
||||
}
|
||||
|
||||
void uiDrawPathAddRectangle(uiDrawPath *p, double x, double y, double width, double height)
|
||||
{
|
||||
struct piece piece;
|
||||
|
||||
piece.type = addRect;
|
||||
piece.d[0] = x;
|
||||
piece.d[1] = y;
|
||||
piece.d[2] = width;
|
||||
piece.d[3] = height;
|
||||
add(p, &piece);
|
||||
}
|
||||
|
||||
void uiDrawPathEnd(uiDrawPath *p)
|
||||
{
|
||||
p->ended = TRUE;
|
||||
}
|
||||
|
||||
void runPath(uiDrawPath *p, cairo_t *cr)
|
||||
{
|
||||
guint i;
|
||||
struct piece *piece;
|
||||
void (*arc)(cairo_t *, double, double, double, double, double);
|
||||
|
||||
if (!p->ended)
|
||||
complain("path not ended in runPath()");
|
||||
cairo_new_path(cr);
|
||||
for (i = 0; i < p->pieces->len; i++) {
|
||||
piece = &g_array_index(p->pieces, struct piece, i);
|
||||
switch (piece->type) {
|
||||
case newFigure:
|
||||
cairo_move_to(cr, piece->d[0], piece->d[1]);
|
||||
break;
|
||||
case newFigureArc:
|
||||
cairo_new_sub_path(cr);
|
||||
// fall through
|
||||
case arcTo:
|
||||
arc = cairo_arc;
|
||||
if (piece->b)
|
||||
arc = cairo_arc_negative;
|
||||
(*arc)(cr,
|
||||
piece->d[0],
|
||||
piece->d[1],
|
||||
piece->d[2],
|
||||
piece->d[3],
|
||||
piece->d[3] + piece->d[4]);
|
||||
break;
|
||||
case lineTo:
|
||||
cairo_line_to(cr, piece->d[0], piece->d[1]);
|
||||
break;
|
||||
case bezierTo:
|
||||
cairo_curve_to(cr,
|
||||
piece->d[0],
|
||||
piece->d[1],
|
||||
piece->d[2],
|
||||
piece->d[3],
|
||||
piece->d[4],
|
||||
piece->d[5]);
|
||||
break;
|
||||
case closeFigure:
|
||||
cairo_close_path(cr);
|
||||
break;
|
||||
case addRect:
|
||||
cairo_rectangle(cr,
|
||||
piece->d[0],
|
||||
piece->d[1],
|
||||
piece->d[2],
|
||||
piece->d[3]);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
uiDrawFillMode pathFillMode(uiDrawPath *path)
|
||||
{
|
||||
return path->fillMode;
|
||||
}
|
||||
|
|
@ -0,0 +1,328 @@
|
|||
// 6 september 2015
|
||||
#include "uipriv_unix.h"
|
||||
#include "draw.h"
|
||||
|
||||
struct uiDrawFontFamilies {
|
||||
PangoFontFamily **f;
|
||||
int n;
|
||||
};
|
||||
|
||||
uiDrawFontFamilies *uiDrawListFontFamilies(void)
|
||||
{
|
||||
uiDrawFontFamilies *ff;
|
||||
PangoFontMap *map;
|
||||
|
||||
ff = uiNew(uiDrawFontFamilies);
|
||||
map = pango_cairo_font_map_get_default();
|
||||
pango_font_map_list_families(map, &(ff->f), &(ff->n));
|
||||
// do not free map; it's a shared resource
|
||||
return ff;
|
||||
}
|
||||
|
||||
uintmax_t uiDrawFontFamiliesNumFamilies(uiDrawFontFamilies *ff)
|
||||
{
|
||||
return ff->n;
|
||||
}
|
||||
|
||||
char *uiDrawFontFamiliesFamily(uiDrawFontFamilies *ff, uintmax_t n)
|
||||
{
|
||||
PangoFontFamily *f;
|
||||
|
||||
f = ff->f[n];
|
||||
return uiUnixStrdupText(pango_font_family_get_name(f));
|
||||
}
|
||||
|
||||
void uiDrawFreeFontFamilies(uiDrawFontFamilies *ff)
|
||||
{
|
||||
g_free(ff->f);
|
||||
uiFree(ff);
|
||||
}
|
||||
|
||||
struct uiDrawTextFont {
|
||||
PangoFont *f;
|
||||
};
|
||||
|
||||
uiDrawTextFont *mkTextFont(PangoFont *f, gboolean ref)
|
||||
{
|
||||
uiDrawTextFont *font;
|
||||
|
||||
font = uiNew(uiDrawTextFont);
|
||||
font->f = f;
|
||||
if (ref)
|
||||
g_object_ref(font->f);
|
||||
return font;
|
||||
}
|
||||
|
||||
static const PangoWeight pangoWeights[] = {
|
||||
[uiDrawTextWeightThin] = PANGO_WEIGHT_THIN,
|
||||
[uiDrawTextWeightUltraLight] = PANGO_WEIGHT_ULTRALIGHT,
|
||||
[uiDrawTextWeightLight] = PANGO_WEIGHT_LIGHT,
|
||||
[uiDrawTextWeightBook] = PANGO_WEIGHT_BOOK,
|
||||
[uiDrawTextWeightNormal] = PANGO_WEIGHT_NORMAL,
|
||||
[uiDrawTextWeightMedium] = PANGO_WEIGHT_MEDIUM,
|
||||
[uiDrawTextWeightSemiBold] = PANGO_WEIGHT_SEMIBOLD,
|
||||
[uiDrawTextWeightBold] = PANGO_WEIGHT_BOLD,
|
||||
[uiDrawTextWeightUtraBold] = PANGO_WEIGHT_ULTRABOLD,
|
||||
[uiDrawTextWeightHeavy] = PANGO_WEIGHT_HEAVY,
|
||||
[uiDrawTextWeightUltraHeavy] = PANGO_WEIGHT_ULTRAHEAVY,
|
||||
};
|
||||
|
||||
static const PangoStyle pangoItalics[] = {
|
||||
[uiDrawTextItalicNormal] = PANGO_STYLE_NORMAL,
|
||||
[uiDrawTextItalicOblique] = PANGO_STYLE_OBLIQUE,
|
||||
[uiDrawTextItalicItalic] = PANGO_STYLE_ITALIC,
|
||||
};
|
||||
|
||||
static const PangoStretch pangoStretches[] = {
|
||||
[uiDrawTextStretchUltraCondensed] = PANGO_STRETCH_ULTRA_CONDENSED,
|
||||
[uiDrawTextStretchExtraCondensed] = PANGO_STRETCH_EXTRA_CONDENSED,
|
||||
[uiDrawTextStretchCondensed] = PANGO_STRETCH_CONDENSED,
|
||||
[uiDrawTextStretchSemiCondensed] = PANGO_STRETCH_SEMI_CONDENSED,
|
||||
[uiDrawTextStretchNormal] = PANGO_STRETCH_NORMAL,
|
||||
[uiDrawTextStretchSemiExpanded] = PANGO_STRETCH_SEMI_EXPANDED,
|
||||
[uiDrawTextStretchExpanded] = PANGO_STRETCH_EXPANDED,
|
||||
[uiDrawTextStretchExtraExpanded] = PANGO_STRETCH_EXTRA_EXPANDED,
|
||||
[uiDrawTextStretchUltraExpanded] = PANGO_STRETCH_ULTRA_EXPANDED,
|
||||
};
|
||||
|
||||
// we need a context for a few things
|
||||
// the documentation suggests creating cairo_t-specific, GdkScreen-specific, or even GtkWidget-specific contexts, but we can't really do that because we want our uiDrawTextFonts and uiDrawTextLayouts to be context-independent
|
||||
// so this will have to do
|
||||
// TODO really see if there's a better way instead; what do GDK and GTK+ do internally? gdk_pango_context_get()?
|
||||
#define mkGenericPangoCairoContext() (pango_font_map_create_context(pango_cairo_font_map_get_default()))
|
||||
|
||||
PangoFont *pangoDescToPangoFont(PangoFontDescription *pdesc)
|
||||
{
|
||||
PangoFont *f;
|
||||
PangoContext *context;
|
||||
|
||||
// in this case, the context is necessary for the metrics to be correct
|
||||
context = mkGenericPangoCairoContext();
|
||||
f = pango_font_map_load_font(pango_cairo_font_map_get_default(), context, pdesc);
|
||||
if (f == NULL) {
|
||||
// TODO
|
||||
g_error("[libui] no match in pangoDescToPangoFont(); report to andlabs");
|
||||
}
|
||||
g_object_unref(context);
|
||||
return f;
|
||||
}
|
||||
|
||||
uiDrawTextFont *uiDrawLoadClosestFont(const uiDrawTextFontDescriptor *desc)
|
||||
{
|
||||
PangoFont *f;
|
||||
PangoFontDescription *pdesc;
|
||||
|
||||
pdesc = pango_font_description_new();
|
||||
pango_font_description_set_family(pdesc,
|
||||
desc->Family);
|
||||
pango_font_description_set_size(pdesc,
|
||||
(gint) (desc->Size * PANGO_SCALE));
|
||||
pango_font_description_set_weight(pdesc,
|
||||
pangoWeights[desc->Weight]);
|
||||
pango_font_description_set_style(pdesc,
|
||||
pangoItalics[desc->Italic]);
|
||||
pango_font_description_set_stretch(pdesc,
|
||||
pangoStretches[desc->Stretch]);
|
||||
f = pangoDescToPangoFont(pdesc);
|
||||
pango_font_description_free(pdesc);
|
||||
return mkTextFont(f, FALSE); // we hold the initial reference; no need to ref
|
||||
}
|
||||
|
||||
void uiDrawFreeTextFont(uiDrawTextFont *font)
|
||||
{
|
||||
g_object_unref(font->f);
|
||||
uiFree(font);
|
||||
}
|
||||
|
||||
uintptr_t uiDrawTextFontHandle(uiDrawTextFont *font)
|
||||
{
|
||||
return (uintptr_t) (font->f);
|
||||
}
|
||||
|
||||
void uiDrawTextFontDescribe(uiDrawTextFont *font, uiDrawTextFontDescriptor *desc)
|
||||
{
|
||||
PangoFontDescription *pdesc;
|
||||
|
||||
// this creates a copy; we free it later
|
||||
pdesc = pango_font_describe(font->f);
|
||||
|
||||
// TODO
|
||||
|
||||
pango_font_description_free(pdesc);
|
||||
}
|
||||
|
||||
// See https://developer.gnome.org/pango/1.30/pango-Cairo-Rendering.html#pango-Cairo-Rendering.description
|
||||
// Note that we convert to double before dividing to make sure the floating-point stuff is right
|
||||
#define pangoToCairo(pango) (((double) (pango)) / PANGO_SCALE)
|
||||
#define cairoToPango(cairo) ((gint) ((cairo) * PANGO_SCALE))
|
||||
|
||||
// TODO this isn't enough; pango adds extra space to each layout
|
||||
void uiDrawTextFontGetMetrics(uiDrawTextFont *font, uiDrawTextFontMetrics *metrics)
|
||||
{
|
||||
PangoFontMetrics *pm;
|
||||
|
||||
pm = pango_font_get_metrics(font->f, NULL);
|
||||
metrics->Ascent = pangoToCairo(pango_font_metrics_get_ascent(pm));
|
||||
metrics->Descent = pangoToCairo(pango_font_metrics_get_descent(pm));
|
||||
// Pango doesn't seem to expose this :( Use 0 and hope for the best.
|
||||
metrics->Leading = 0;
|
||||
metrics->UnderlinePos = pangoToCairo(pango_font_metrics_get_underline_position(pm));
|
||||
metrics->UnderlineThickness = pangoToCairo(pango_font_metrics_get_underline_thickness(pm));
|
||||
pango_font_metrics_unref(pm);
|
||||
}
|
||||
|
||||
// note: PangoCairoLayouts are tied to a given cairo_t, so we can't store one in this device-independent structure
|
||||
struct uiDrawTextLayout {
|
||||
char *s;
|
||||
ptrdiff_t *charsToBytes;
|
||||
PangoFont *defaultFont;
|
||||
double width;
|
||||
PangoAttrList *attrs;
|
||||
};
|
||||
|
||||
static ptrdiff_t *computeCharsToBytes(const char *s)
|
||||
{
|
||||
ptrdiff_t *charsToBytes;
|
||||
glong i, charlen;
|
||||
|
||||
// we INCLUDE the null terminator as a character in the string
|
||||
// g_utf8_offset_to_pointer() doesn't stop on null terminator so this should work
|
||||
charlen = g_utf8_strlen(s, -1) + 1;
|
||||
charsToBytes = (ptrdiff_t *) uiAlloc(charlen * sizeof (ptrdiff_t), "ptrdiff_t[]");
|
||||
// TODO speed this up by not needing to scan the whole string again
|
||||
for (i = 0; i < charlen; i++)
|
||||
charsToBytes[i] = g_utf8_offset_to_pointer(s, i) - s;
|
||||
return charsToBytes;
|
||||
}
|
||||
|
||||
uiDrawTextLayout *uiDrawNewTextLayout(const char *text, uiDrawTextFont *defaultFont, double width)
|
||||
{
|
||||
uiDrawTextLayout *layout;
|
||||
|
||||
layout = uiNew(uiDrawTextLayout);
|
||||
layout->s = g_strdup(text);
|
||||
layout->charsToBytes = computeCharsToBytes(layout->s);
|
||||
layout->defaultFont = defaultFont->f;
|
||||
g_object_ref(layout->defaultFont); // retain a copy
|
||||
uiDrawTextLayoutSetWidth(layout, width);
|
||||
layout->attrs = pango_attr_list_new();
|
||||
return layout;
|
||||
}
|
||||
|
||||
void uiDrawFreeTextLayout(uiDrawTextLayout *layout)
|
||||
{
|
||||
pango_attr_list_unref(layout->attrs);
|
||||
g_object_unref(layout->defaultFont);
|
||||
uiFree(layout->charsToBytes);
|
||||
g_free(layout->s);
|
||||
uiFree(layout);
|
||||
}
|
||||
|
||||
void uiDrawTextLayoutSetWidth(uiDrawTextLayout *layout, double width)
|
||||
{
|
||||
layout->width = width;
|
||||
}
|
||||
|
||||
static void prepareLayout(uiDrawTextLayout *layout, PangoLayout *pl)
|
||||
{
|
||||
PangoFontDescription *desc;
|
||||
int width;
|
||||
|
||||
pango_layout_set_text(pl, layout->s, -1);
|
||||
|
||||
// again, this makes a copy
|
||||
desc = pango_font_describe(layout->defaultFont);
|
||||
// this is safe; the description is copied
|
||||
pango_layout_set_font_description(pl, desc);
|
||||
pango_font_description_free(desc);
|
||||
|
||||
width = cairoToPango(layout->width);
|
||||
if (layout->width < 0)
|
||||
width = -1;
|
||||
pango_layout_set_width(pl, width);
|
||||
|
||||
pango_layout_set_attributes(pl, layout->attrs);
|
||||
}
|
||||
|
||||
void uiDrawTextLayoutExtents(uiDrawTextLayout *layout, double *width, double *height)
|
||||
{
|
||||
PangoContext *context;
|
||||
PangoLayout *pl;
|
||||
PangoRectangle logical;
|
||||
|
||||
// in this case, the context is necessary to create the layout
|
||||
context = mkGenericPangoCairoContext();
|
||||
pl = pango_layout_new(context);
|
||||
// TODO g_object_unref() context?
|
||||
prepareLayout(layout, pl);
|
||||
|
||||
pango_layout_get_extents(pl, NULL, &logical);
|
||||
|
||||
g_object_unref(pl);
|
||||
|
||||
*width = pangoToCairo(logical.width);
|
||||
*height = pangoToCairo(logical.height);
|
||||
}
|
||||
|
||||
void uiDrawText(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout)
|
||||
{
|
||||
PangoLayout *pl;
|
||||
|
||||
pl = pango_cairo_create_layout(c->cr);
|
||||
prepareLayout(layout, pl);
|
||||
|
||||
cairo_move_to(c->cr, x, y);
|
||||
pango_cairo_show_layout(c->cr, pl);
|
||||
|
||||
g_object_unref(pl);
|
||||
}
|
||||
|
||||
static void addAttr(uiDrawTextLayout *layout, PangoAttribute *attr, intmax_t startChar, intmax_t endChar)
|
||||
{
|
||||
attr->start_index = layout->charsToBytes[startChar];
|
||||
attr->end_index = layout->charsToBytes[endChar];
|
||||
pango_attr_list_insert(layout->attrs, attr);
|
||||
// pango_attr_list_insert() takes attr; we don't free it
|
||||
}
|
||||
|
||||
// these attributes are only supported on 1.38 and higher; we need to support 1.36
|
||||
// use dynamic linking to make them work at least on newer systems
|
||||
// TODO warn programmers
|
||||
static PangoAttribute *(*newFGAlphaAttr)(guint16 alpha) = NULL;
|
||||
static gboolean tried138 = FALSE;
|
||||
|
||||
// note that we treat any error as "the 1.38 symbols aren't there" (and don't care if dlclose() failed)
|
||||
static void try138(void)
|
||||
{
|
||||
void *handle;
|
||||
|
||||
tried138 = TRUE;
|
||||
// dlsym() walks the dependency chain, so opening the current process should be sufficient
|
||||
handle = dlopen(NULL, RTLD_LAZY);
|
||||
if (handle == NULL)
|
||||
return;
|
||||
*((void **) (&newFGAlphaAttr)) = dlsym(handle, "pango_attr_foreground_alpha_new");
|
||||
dlclose(handle);
|
||||
}
|
||||
|
||||
void uiDrawTextLayoutSetColor(uiDrawTextLayout *layout, intmax_t startChar, intmax_t endChar, double r, double g, double b, double a)
|
||||
{
|
||||
PangoAttribute *attr;
|
||||
guint16 rr, gg, bb, aa;
|
||||
|
||||
rr = (guint16) (r * 65535);
|
||||
gg = (guint16) (g * 65535);
|
||||
bb = (guint16) (b * 65535);
|
||||
aa = (guint16) (a * 65535);
|
||||
|
||||
attr = pango_attr_foreground_new(rr, gg, bb);
|
||||
addAttr(layout, attr, startChar, endChar);
|
||||
|
||||
if (!tried138)
|
||||
try138();
|
||||
// TODO what if aa == 0?
|
||||
if (newFGAlphaAttr != NULL) {
|
||||
attr = (*newFGAlphaAttr)(aa);
|
||||
addAttr(layout, attr, startChar, endChar);
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue