static void
draw_text (RsvgDrawingCtx * ctx, cairo_t *cr, double *x, double *y,
const char *text)
{
PangoContext *context;
PangoLayout *layout;
RsvgState *state;
PangoLayoutLine *line;
int w, h;
state = rsvg_current_state (ctx);
if (state->font_size.length == 0)
return;
context = ctx->render->create_pango_context (ctx);
layout = rsvg_text_create_layout (ctx, state, text, context);
pango_layout_get_size(layout, &w, &h);
// From pango example
// http://git.gnome.org/browse/pango/tree/examples/cairotwisted.c
line = pango_layout_get_line_readonly (layout, 0);
cairo_move_to (cr, *x, *y);
pango_cairo_layout_line_path (cr, line);
// Update x, y based on dimensions of text drawn
if (PANGO_GRAVITY_IS_VERTICAL (state->text_gravity))
*y += w / (double)PANGO_SCALE;
else
*x += w / (double)PANGO_SCALE;
g_object_unref (layout);
g_object_unref (context);
}
void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const
{
#if defined(USE_FREETYPE)
if (!primaryFont()->platformData().m_pattern) {
drawSimpleText(context, run, point, from, to);
return;
}
#endif
cairo_t* cr = context->platformContext();
PangoLayout* layout = pango_cairo_create_layout(cr);
setPangoAttributes(this, run, layout);
gchar* utf8 = convertUniCharToUTF8(run.characters(), run.length(), 0, run.length());
pango_layout_set_text(layout, utf8, -1);
// Our layouts are single line
PangoLayoutLine* layoutLine = pango_layout_get_line_readonly(layout, 0);
// Get the region where this text will be laid out. We will use it to clip
// the Cairo context, for when we are only painting part of the text run and
// to calculate the size of the shadow buffer.
PangoRegionType partialRegion = 0;
char* start = g_utf8_offset_to_pointer(utf8, from);
char* end = g_utf8_offset_to_pointer(start, to - from);
int ranges[] = {start - utf8, end - utf8};
partialRegion = gdk_pango_layout_line_get_clip_region(layoutLine, 0, 0, ranges, 1);
drawGlyphsShadow(context, cr, point, layoutLine, partialRegion);
cairo_save(cr);
cairo_translate(cr, point.x(), point.y());
float red, green, blue, alpha;
context->fillColor().getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha);
gdk_cairo_region(cr, partialRegion);
cairo_clip(cr);
pango_cairo_show_layout_line(cr, layoutLine);
if (context->textDrawingMode() & TextModeStroke) {
Color strokeColor = context->strokeColor();
strokeColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha);
pango_cairo_layout_line_path(cr, layoutLine);
cairo_set_line_width(cr, context->strokeThickness());
cairo_stroke(cr);
}
// Pango sometimes leaves behind paths we don't want
cairo_new_path(cr);
destroyPangoRegion(partialRegion);
g_free(utf8);
g_object_unref(layout);
cairo_restore(cr);
}
void Font::drawComplexText(GraphicsContext* context, const TextRun& run, const FloatPoint& point, int from, int to) const
{
cairo_t* cr = context->platformContext();
cairo_save(cr);
cairo_translate(cr, point.x(), point.y());
PangoLayout* layout = pango_cairo_create_layout(cr);
setPangoAttributes(this, run, layout);
gchar* utf8 = convertUniCharToUTF8(run.characters(), run.length(), 0, run.length());
pango_layout_set_text(layout, utf8, -1);
// Our layouts are single line
PangoLayoutLine* layoutLine = pango_layout_get_line_readonly(layout, 0);
GdkRegion* partialRegion = NULL;
if (to - from != run.length()) {
// Clip the region of the run to be rendered
char* start = g_utf8_offset_to_pointer(utf8, from);
char* end = g_utf8_offset_to_pointer(start, to - from);
int ranges[] = {start - utf8, end - utf8};
partialRegion = gdk_pango_layout_line_get_clip_region(layoutLine, 0, 0, ranges, 1);
gdk_region_shrink(partialRegion, 0, -pixelSize());
}
Color fillColor = context->fillColor();
float red, green, blue, alpha;
// Text shadow, inspired by FontMac
IntSize shadowSize;
int shadowBlur = 0;
Color shadowColor;
bool hasShadow = context->textDrawingMode() == cTextFill &&
context->getShadow(shadowSize, shadowBlur, shadowColor);
// TODO: Blur support
if (hasShadow) {
// Disable graphics context shadows (not yet implemented) and paint them manually
context->clearShadow();
Color shadowFillColor(shadowColor.red(), shadowColor.green(), shadowColor.blue(), shadowColor.alpha() * fillColor.alpha() / 255);
cairo_save(cr);
shadowFillColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha);
cairo_translate(cr, shadowSize.width(), shadowSize.height());
if (partialRegion) {
gdk_cairo_region(cr, partialRegion);
cairo_clip(cr);
}
pango_cairo_show_layout_line(cr, layoutLine);
cairo_restore(cr);
}
fillColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha);
if (partialRegion) {
gdk_cairo_region(cr, partialRegion);
cairo_clip(cr);
}
pango_cairo_show_layout_line(cr, layoutLine);
if (context->textDrawingMode() & cTextStroke) {
Color strokeColor = context->strokeColor();
strokeColor.getRGBA(red, green, blue, alpha);
cairo_set_source_rgba(cr, red, green, blue, alpha);
pango_cairo_layout_line_path(cr, layoutLine);
cairo_set_line_width(cr, context->strokeThickness());
cairo_stroke(cr);
}
// Re-enable the platform shadow we disabled earlier
if (hasShadow)
context->setShadow(shadowSize, shadowBlur, shadowColor);
// Pango sometimes leaves behind paths we don't want
cairo_new_path(cr);
if (partialRegion)
gdk_region_destroy(partialRegion);
g_free(utf8);
g_object_unref(layout);
cairo_restore(cr);
}
static VALUE
rg_pango_layout_line_path(VALUE self, VALUE line)
{
pango_cairo_layout_line_path(RVAL2CRCONTEXT(self), RVAL2PANGOLAYOUTLINE(line));
return self;
}
