libui/zOLD_unix/draw.c

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// 6 september 2015
#include "uipriv_unix.h"
#include "draw.h"
uiDrawContext *uiprivNewContext(cairo_t *cr, GtkStyleContext *style)
{
uiDrawContext *c;
c = uiprivNew(uiDrawContext);
c->cr = cr;
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c->style = style;
return c;
}
void uiprivFreeContext(uiDrawContext *c)
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{
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// free neither cr nor style; we own neither
uiprivFree(c);
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}
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)
uiprivImplBug("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;
uiprivRunPath(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;
}
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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);
}
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void uiDrawFill(uiDrawContext *c, uiDrawPath *path, uiDrawBrush *b)
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{
cairo_pattern_t *pat;
uiprivRunPath(path, c->cr);
pat = mkbrush(b);
cairo_set_source(c->cr, pat);
switch (uiprivPathFillMode(path)) {
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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);
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}
void uiDrawTransform(uiDrawContext *c, uiDrawMatrix *m)
{
cairo_matrix_t cm;
uiprivM2C(m, &cm);
cairo_transform(c->cr, &cm);
}
void uiDrawClip(uiDrawContext *c, uiDrawPath *path)
{
uiprivRunPath(path, c->cr);
switch (uiprivPathFillMode(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);
}