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Wrote the SetColor() for GTK+. Now to test.

This commit is contained in:
Pietro Gagliardi 2016-04-19 23:52:44 -04:00
parent 721269b3eb
commit 6b6d6861c1
1 changed files with 58 additions and 0 deletions
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58
unix/draw.c
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@ -447,6 +447,8 @@ void uiDrawRestore(uiDrawContext *c)
cairo_restore(c->cr); cairo_restore(c->cr);
} }
// TODO split everything after this into a drawtext.c
struct uiDrawFontFamilies { struct uiDrawFontFamilies {
PangoFontFamily **f; PangoFontFamily **f;
int n; int n;
@ -623,6 +625,7 @@ struct uiDrawTextLayout {
ptrdiff_t *charsToBytes; ptrdiff_t *charsToBytes;
PangoFont *defaultFont; PangoFont *defaultFont;
double width; double width;
PangoAttrList *attrs;
}; };
static ptrdiff_t *computeCharsToBytes(const char *s) static ptrdiff_t *computeCharsToBytes(const char *s)
@ -650,11 +653,13 @@ uiDrawTextLayout *uiDrawNewTextLayout(const char *text, uiDrawTextFont *defaultF
layout->defaultFont = defaultFont->f; layout->defaultFont = defaultFont->f;
g_object_ref(layout->defaultFont); // retain a copy g_object_ref(layout->defaultFont); // retain a copy
uiDrawTextLayoutSetWidth(layout, width); uiDrawTextLayoutSetWidth(layout, width);
layout->attrs = pango_attr_list_new();
return layout; return layout;
} }
void uiDrawFreeTextLayout(uiDrawTextLayout *layout) void uiDrawFreeTextLayout(uiDrawTextLayout *layout)
{ {
pango_attr_list_unref(layout->attrs);
g_object_unref(layout->defaultFont); g_object_unref(layout->defaultFont);
uiFree(layout->charsToBytes); uiFree(layout->charsToBytes);
g_free(layout->s); g_free(layout->s);
@ -683,6 +688,8 @@ static void prepareLayout(uiDrawTextLayout *layout, PangoLayout *pl)
if (layout->width < 0) if (layout->width < 0)
width = -1; width = -1;
pango_layout_set_width(pl, width); pango_layout_set_width(pl, width);
pango_layout_set_attribute_list(pl, layout->attrs);
} }
void uiDrawTextLayoutExtents(uiDrawTextLayout *layout, double *width, double *height) void uiDrawTextLayoutExtents(uiDrawTextLayout *layout, double *width, double *height)
@ -717,3 +724,54 @@ void uiDrawText(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout)
g_object_unref(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
staticPangoAttribute *(*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;
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) {
g_printf("adding alpha\n");
attr = (*newFGAlphaAttr)(aa);
addAttr(layout, attr, startChar, endChar);
}
else g_printf("ignoring alpha\n");
}