Started implementing the new text layout stuff on GTK+. The drawtext example works.

This commit is contained in:
Pietro Gagliardi 2017-01-17 21:06:45 -05:00
parent 7f270942a7
commit 5444f76bd3
6 changed files with 318 additions and 245 deletions

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@ -117,6 +117,7 @@ int main(void)
uiWindowOnClosing(mainwin, onClosing, NULL); uiWindowOnClosing(mainwin, onClosing, NULL);
area = uiNewArea(&handler); area = uiNewArea(&handler);
// TODO on GTK+ this doesn't get expand properties set properly?
uiWindowSetChild(mainwin, uiControl(area)); uiWindowSetChild(mainwin, uiControl(area));
uiControlShow(uiControl(mainwin)); uiControlShow(uiControl(mainwin));

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@ -22,7 +22,7 @@ list(APPEND _LIBUI_SOURCES
unix/drawtext.c unix/drawtext.c
unix/editablecombo.c unix/editablecombo.c
unix/entry.c unix/entry.c
unix/fontbutton.c # unix/fontbutton.c
unix/form.c unix/form.c
unix/future.c unix/future.c
unix/graphemes.c unix/graphemes.c

217
unix/_old_drawtext.c Normal file
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@ -0,0 +1,217 @@
// 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;
}
int uiDrawFontFamiliesNumFamilies(uiDrawFontFamilies *ff)
{
return ff->n;
}
char *uiDrawFontFamiliesFamily(uiDrawFontFamilies *ff, int 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;
}
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) {
// LONGTERM
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))
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 *graphemes;
PangoFont *defaultFont;
double width;
PangoAttrList *attrs;
};
uiDrawTextLayout *uiDrawNewTextLayout(const char *text, uiDrawTextFont *defaultFont, double width)
{
uiDrawTextLayout *layout;
PangoContext *context;
layout = uiNew(uiDrawTextLayout);
layout->s = g_strdup(text);
context = mkGenericPangoCairoContext();
layout->graphemes = graphemes(layout->s, context);
g_object_unref(context);
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->graphemes);
g_free(layout->s);
uiFree(layout);
}
void uiDrawTextLayoutSetWidth(uiDrawTextLayout *layout, double width)
{
layout->width = width;
}
static void prepareLayout(uiDrawTextLayout *layout, PangoLayout *pl)
{
// again, this makes a copy
desc = pango_font_describe(layout->defaultFont);
pango_layout_set_attributes(pl, layout->attrs);
}
void uiDrawText(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout)
{
PangoLayout *pl;
pl = pango_cairo_create_layout(c->cr);
}
static void addAttr(uiDrawTextLayout *layout, PangoAttribute *attr, int startChar, int endChar)
{
attr->start_index = layout->graphemes[startChar];
attr->end_index = layout->graphemes[endChar];
pango_attr_list_insert(layout->attrs, attr);
// pango_attr_list_insert() takes attr; we don't free it
}
void uiDrawTextLayoutSetColor(uiDrawTextLayout *layout, int startChar, int 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);
// TODO what if aa == 0?
attr = FUTURE_pango_attr_foreground_alpha_new(aa);
if (attr != NULL)
addAttr(layout, attr, startChar, endChar);
}

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@ -1,71 +1,21 @@
// 6 september 2015 // 17 january 2017
#include "uipriv_unix.h" #include "uipriv_unix.h"
#include "draw.h" #include "draw.h"
struct uiDrawFontFamilies { struct uiDrawTextLayout {
PangoFontFamily **f; PangoLayout *layout;
int n;
}; };
uiDrawFontFamilies *uiDrawListFontFamilies(void) // See https://developer.gnome.org/pango/1.30/pango-Cairo-Rendering.html#pango-Cairo-Rendering.description
{ // For the conversion, see https://developer.gnome.org/pango/1.30/pango-Glyph-Storage.html#pango-units-to-double and https://developer.gnome.org/pango/1.30/pango-Glyph-Storage.html#pango-units-from-double
uiDrawFontFamilies *ff; #define pangoToCairo(pango) (pango_units_to_double(pango))
PangoFontMap *map; #define cairoToPango(cairo) (pango_units_from_double(cairo))
ff = uiNew(uiDrawFontFamilies); // we need a context for a few things
map = pango_cairo_font_map_get_default(); // 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
pango_font_map_list_families(map, &(ff->f), &(ff->n)); // we could use pango_font_map_create_context(pango_cairo_font_map_get_default()) but that will ignore GDK-specific settings
// do not free map; it's a shared resource // so let's use gdk_pango_context_get() instead; even though it's for the default screen only, it's good enough for us
return ff; #define mkGenericPangoCairoContext() (gdk_pango_context_get())
}
int uiDrawFontFamiliesNumFamilies(uiDrawFontFamilies *ff)
{
return ff->n;
}
char *uiDrawFontFamiliesFamily(uiDrawFontFamilies *ff, int 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,
[uiDrawTextWeightUltraBold] = PANGO_WEIGHT_ULTRABOLD,
[uiDrawTextWeightHeavy] = PANGO_WEIGHT_HEAVY,
[uiDrawTextWeightUltraHeavy] = PANGO_WEIGHT_ULTRAHEAVY,
};
static const PangoStyle pangoItalics[] = { static const PangoStyle pangoItalics[] = {
[uiDrawTextItalicNormal] = PANGO_STYLE_NORMAL, [uiDrawTextItalicNormal] = PANGO_STYLE_NORMAL,
@ -85,209 +35,112 @@ static const PangoStretch pangoStretches[] = {
[uiDrawTextStretchUltraExpanded] = PANGO_STRETCH_ULTRA_EXPANDED, [uiDrawTextStretchUltraExpanded] = PANGO_STRETCH_ULTRA_EXPANDED,
}; };
// we need a context for a few things uiDrawTextLayout *uiDrawNewTextLayout(uiAttributedString *s, uiDrawFontDescriptor *defaultFont, double width)
// 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
// we could use pango_font_map_create_context(pango_cairo_font_map_get_default()) but that will ignore GDK-specific settings
// so let's use gdk_pango_context_get() instead; even though it's for the default screen only, it's good enough for us
#define mkGenericPangoCairoContext() (gdk_pango_context_get())
PangoFont *pangoDescToPangoFont(PangoFontDescription *pdesc)
{ {
PangoFont *f; uiDrawTextLayout *tl;
PangoContext *context; 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) {
// LONGTERM
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))
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 *graphemes;
PangoFont *defaultFont;
double width;
PangoAttrList *attrs;
};
uiDrawTextLayout *uiDrawNewTextLayout(const char *text, uiDrawTextFont *defaultFont, double width)
{
uiDrawTextLayout *layout;
PangoContext *context;
layout = uiNew(uiDrawTextLayout);
layout->s = g_strdup(text);
context = mkGenericPangoCairoContext();
layout->graphemes = graphemes(layout->s, context);
g_object_unref(context);
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->graphemes);
g_free(layout->s);
uiFree(layout);
}
void uiDrawTextLayoutSetWidth(uiDrawTextLayout *layout, double width)
{
layout->width = width;
}
static void prepareLayout(uiDrawTextLayout *layout, PangoLayout *pl)
{
PangoFontDescription *desc; PangoFontDescription *desc;
int width; int pangoWidth;
pango_layout_set_text(pl, layout->s, -1); tl = uiNew(uiDrawTextLayout);
// 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 // in this case, the context is necessary to create the layout
// the layout takes a ref on the context so we can unref it afterward // the layout takes a ref on the context so we can unref it afterward
context = mkGenericPangoCairoContext(); context = mkGenericPangoCairoContext();
pl = pango_layout_new(context); tl->layout = pango_layout_new(context);
g_object_unref(context); g_object_unref(context);
prepareLayout(layout, pl);
pango_layout_get_extents(pl, NULL, &logical); // this is safe; pango_layout_set_text() copies the string
pango_layout_set_text(tl->layout, uiAttributedStringString(s), -1);
g_object_unref(pl); desc = pango_font_description_new();
pango_font_description_set_family(desc, defaultFont->Family);
pango_font_description_set_style(desc, pangoItalics[defaultFont->Italic]);
// for the most part, pango weights correlate to ours
// the differences:
// - Book — libui: 350, Pango: 380
// - Ultra Heavy — libui: 950, Pango: 1000
// TODO figure out what to do about this misalignment
pango_font_description_set_weight(desc, defaultFont->Weight);
pango_font_description_set_stretch(desc, pangoStretches[defaultFont->Stretch]);
// see https://developer.gnome.org/pango/1.30/pango-Fonts.html#pango-font-description-set-size and https://developer.gnome.org/pango/1.30/pango-Glyph-Storage.html#pango-units-from-double
pango_font_description_set_size(desc, pango_units_from_double(defaultFont->Size));
pango_layout_set_font_description(tl->layout, desc);
// this is safe; the description is copied
pango_font_description_free(desc);
pangoWidth = cairoToPango(width);
if (width < 0)
pangoWidth = -1;
pango_layout_set_width(tl->layout, pangoWidth);
// TODO attributes
return tl;
}
void uiDrawFreeTextLayout(uiDrawTextLayout *tl)
{
g_object_unref(tl->layout);
uiFree(tl);
}
void uiDrawText(uiDrawContext *c, uiDrawTextLayout *tl, double x, double y)
{
cairo_move_to(c->cr, x, y);
pango_cairo_show_layout(c->cr, tl->layout);
}
void uiDrawTextLayoutExtents(uiDrawTextLayout *tl, double *width, double *height)
{
PangoRectangle logical;
pango_layout_get_extents(tl->layout, NULL, &logical);
*width = pangoToCairo(logical.width); *width = pangoToCairo(logical.width);
*height = pangoToCairo(logical.height); *height = pangoToCairo(logical.height);
} }
void uiDrawText(uiDrawContext *c, double x, double y, uiDrawTextLayout *layout) int uiDrawTextLayoutNumLines(uiDrawTextLayout *tl)
{ {
PangoLayout *pl; return pango_layout_get_line_count(tl->layout);
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, int startChar, int endChar) void uiDrawTextLayoutLineByteRange(uiDrawTextLayout *tl, int line, size_t *start, size_t *end)
{ {
attr->start_index = layout->graphemes[startChar]; PangoLayoutLine *pll;
attr->end_index = layout->graphemes[endChar];
pango_attr_list_insert(layout->attrs, attr); pll = pango_layout_get_line_readonly(tl->layout, line);
// pango_attr_list_insert() takes attr; we don't free it *start = pll->start_index;
*end = pll->start_index + pll->length;
// TODO unref?
} }
void uiDrawTextLayoutSetColor(uiDrawTextLayout *layout, int startChar, int endChar, double r, double g, double b, double a) void uiDrawTextLayoutLineGetMetrics(uiDrawTextLayout *tl, int line, uiDrawTextLayoutLineMetrics *m)
{ {
PangoAttribute *attr; PangoLayoutLine *pll;
guint16 rr, gg, bb, aa;
rr = (guint16) (r * 65535); pll = pango_layout_get_line_readonly(tl->layout, line);
gg = (guint16) (g * 65535); // TODO unref?
bb = (guint16) (b * 65535); }
aa = (guint16) (a * 65535);
// TODO
attr = pango_attr_foreground_new(rr, gg, bb); #if 0
addAttr(layout, attr, startChar, endChar); {
PangoLayoutLine *pll;
// TODO what if aa == 0?
attr = FUTURE_pango_attr_foreground_alpha_new(aa); pll = pango_layout_get_line_readonly(tl->layout, line);
if (attr != NULL) // TODO unref?
addAttr(layout, attr, startChar, endChar); }
#endif
void uiDrawTextLayoutByteIndexToGraphemeRect(uiDrawTextLayout *tl, size_t pos, int *line, double *x, double *y, double *width, double *height)
{
}
void uiDrawTextLayoutHitTest(uiDrawTextLayout *tl, double x, double y, uiDrawTextLayoutHitTestResult *result)
{
}
void uiDrawTextLayoutByteRangeToRectangle(uiDrawTextLayout *tl, size_t start, size_t end, uiDrawTextLayoutByteRangeRectangle *r)
{
} }

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@ -6,7 +6,7 @@ int graphemesTakesUTF16(void)
return 0; return 0;
} }
struct graphemes *graphemes(void *s, size_t len); struct graphemes *graphemes(void *s, size_t len)
{ {
struct graphemes *g; struct graphemes *g;
char *text = (char *) s; char *text = (char *) s;

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@ -46,8 +46,10 @@ extern uiDrawContext *newContext(cairo_t *);
extern void freeContext(uiDrawContext *); extern void freeContext(uiDrawContext *);
// drawtext.c // drawtext.c
#if 0 /* TODO */
extern uiDrawTextFont *mkTextFont(PangoFont *f, gboolean add); extern uiDrawTextFont *mkTextFont(PangoFont *f, gboolean add);
extern PangoFont *pangoDescToPangoFont(PangoFontDescription *pdesc); extern PangoFont *pangoDescToPangoFont(PangoFontDescription *pdesc);
#endif
// image.c // image.c
/*TODO remove this*/typedef struct uiImage uiImage; /*TODO remove this*/typedef struct uiImage uiImage;