another UI attempt, I guess.

sorry.

src/libui_sdl/libui/unix/draw.c

@@ -0,0 +1,141 @@
+// 6 september 2015
+#include "uipriv_unix.h"
+#include "draw.h"
+
+uiDrawContext *newContext(cairo_t *cr)
+{
+	uiDrawContext *c;
+
+	c = uiNew(uiDrawContext);
+	c->cr = cr;
+	return c;
+}
+
+void freeContext(uiDrawContext *c)
+{
+	uiFree(c);
+}
+
+static cairo_pattern_t *mkbrush(uiDrawBrush *b)
+{
+	cairo_pattern_t *pat;
+	size_t i;
+
+	switch (b->Type) {
+	case uiDrawBrushTypeSolid:
+		pat = cairo_pattern_create_rgba(b->R, b->G, b->B, b->A);
+		break;
+	case uiDrawBrushTypeLinearGradient:
+		pat = cairo_pattern_create_linear(b->X0, b->Y0, b->X1, b->Y1);
+		break;
+	case uiDrawBrushTypeRadialGradient:
+		// make the start circle radius 0 to make it a point
+		pat = cairo_pattern_create_radial(
+			b->X0, b->Y0, 0,
+			b->X1, b->Y1, b->OuterRadius);
+		break;
+//	case uiDrawBrushTypeImage:
+	}
+	if (cairo_pattern_status(pat) != CAIRO_STATUS_SUCCESS)
+		implbug("error creating pattern in mkbrush(): %s",
+			cairo_status_to_string(cairo_pattern_status(pat)));
+	switch (b->Type) {
+	case uiDrawBrushTypeLinearGradient:
+	case uiDrawBrushTypeRadialGradient:
+		for (i = 0; i < b->NumStops; i++)
+			cairo_pattern_add_color_stop_rgba(pat,
+				b->Stops[i].Pos,
+				b->Stops[i].R,
+				b->Stops[i].G,
+				b->Stops[i].B,
+				b->Stops[i].A);
+	}
+	return pat;
+}
+
+void uiDrawStroke(uiDrawContext *c, uiDrawPath *path, uiDrawBrush *b, uiDrawStrokeParams *p)
+{
+	cairo_pattern_t *pat;
+
+	runPath(path, c->cr);
+	pat = mkbrush(b);
+	cairo_set_source(c->cr, pat);
+	switch (p->Cap) {
+	case uiDrawLineCapFlat:
+		cairo_set_line_cap(c->cr, CAIRO_LINE_CAP_BUTT);
+		break;
+	case uiDrawLineCapRound:
+		cairo_set_line_cap(c->cr, CAIRO_LINE_CAP_ROUND);
+		break;
+	case uiDrawLineCapSquare:
+		cairo_set_line_cap(c->cr, CAIRO_LINE_CAP_SQUARE);
+		break;
+	}
+	switch (p->Join) {
+	case uiDrawLineJoinMiter:
+		cairo_set_line_join(c->cr, CAIRO_LINE_JOIN_MITER);
+		cairo_set_miter_limit(c->cr, p->MiterLimit);
+		break;
+	case uiDrawLineJoinRound:
+		cairo_set_line_join(c->cr, CAIRO_LINE_JOIN_ROUND);
+		break;
+	case uiDrawLineJoinBevel:
+		cairo_set_line_join(c->cr, CAIRO_LINE_JOIN_BEVEL);
+		break;
+	}
+	cairo_set_line_width(c->cr, p->Thickness);
+	cairo_set_dash(c->cr, p->Dashes, p->NumDashes, p->DashPhase);
+	cairo_stroke(c->cr);
+	cairo_pattern_destroy(pat);
+}
+
+void uiDrawFill(uiDrawContext *c, uiDrawPath *path, uiDrawBrush *b)
+{
+	cairo_pattern_t *pat;
+
+	runPath(path, c->cr);
+	pat = mkbrush(b);
+	cairo_set_source(c->cr, pat);
+	switch (pathFillMode(path)) {
+	case uiDrawFillModeWinding:
+		cairo_set_fill_rule(c->cr, CAIRO_FILL_RULE_WINDING);
+		break;
+	case uiDrawFillModeAlternate:
+		cairo_set_fill_rule(c->cr, CAIRO_FILL_RULE_EVEN_ODD);
+		break;
+	}
+	cairo_fill(c->cr);
+	cairo_pattern_destroy(pat);
+}
+
+void uiDrawTransform(uiDrawContext *c, uiDrawMatrix *m)
+{
+	cairo_matrix_t cm;
+
+	m2c(m, &cm);
+	cairo_transform(c->cr, &cm);
+}
+
+void uiDrawClip(uiDrawContext *c, uiDrawPath *path)
+{
+	runPath(path, c->cr);
+	switch (pathFillMode(path)) {
+	case uiDrawFillModeWinding:
+		cairo_set_fill_rule(c->cr, CAIRO_FILL_RULE_WINDING);
+		break;
+	case uiDrawFillModeAlternate:
+		cairo_set_fill_rule(c->cr, CAIRO_FILL_RULE_EVEN_ODD);
+		break;
+	}
+	cairo_clip(c->cr);
+}
+
+void uiDrawSave(uiDrawContext *c)
+{
+	cairo_save(c->cr);
+}
+
+void uiDrawRestore(uiDrawContext *c)
+{
+	cairo_restore(c->cr);
+}