scaled.font.cairoScaledFontTextToGlyphs(scaled.font, x, y, utf8, utf8.len = -1)utf8 in bytes, or -1 if it is NUL-terminatedCairoStatus] CAIRO_STATUS_SUCCESS upon success, or an error status
if the input values are wrong or if conversion failed. If the input
values are correct but the conversion failed, the error status is also
set on scaled.font.CairoGlyph] pointer to list of glyphs to fillCairoTextCluster] pointer to list of cluster mapping information to fill, or NULLNULLCairoTextClusterFlags] pointer to location to store cluster flags corresponding to the
output clusters, or NULLglyphs initially points to a non-NULL value, that list is used
as a glyph buffer, and num.glyphs should point to the number of glyph
entries available there. If the provided glyph list is too short for
the conversion, Upon return, num.glyphs always contains the
number of generated glyphs. If the value glyphs points to has changed
after the call, This may happen even if the provided
array was large enough.
If clusters is not NULL, num.clusters and cluster.flags should not be NULL,
and cluster mapping will be computed.
The semantics of how cluster list allocation works is similar to the glyph
array. That is,
if clusters initially points to a non-NULL value, that list is used
as a cluster buffer, and num.clusters should point to the number of cluster
entries available there. If the provided cluster list is too short for
the conversion, Upon return, num.clusters always contains the
number of generated clusters. If the value clusters points at has changed
after the call, This may happen even if the provided
array was large enough.
In the simplest case, glyphs and clusters can point to NULL initially
and a suitable list will be allocated. In code:
glyphs <- scaled_font$textToGlyphs(x, y, utf8, utf8_len)if (glyphs$retval == CairoStatus["success"]) cr$showTextGlyphs(utf8, utf8_len, glyphs$glyphs, glyphs$num_glyphs, glyphs$clusters, glyphs$num_clusters, glyphs$cluster_flags) If no cluster mapping is needed: glyphs <- scaled_font$textToGlyphs(x, y, utf8, utf8_len)
if (glyphs$retval == CairoStatus["success"]) { cr$showGlyphs(glyphs$glyphs, glyphs$num_glyphs) } If stack-based glyph and cluster lists are to be used for small arrays: ## R user obviously does not allocate things on the stack. ## This is the same as the first example.
glyphs <- scaled_font$textToGlyphs(x, y, utf8, utf8_len)
if (glyphs$retval == CairoStatus["success"])
cr$showTextGlyphs(utf8, utf8_len,
glyphs$glyphs, glyphs$num_glyphs,
glyphs$clusters, glyphs$num_clusters,
glyphs$cluster_flags)
For details of how clusters, num.clusters, and cluster.flags map input
UTF-8 text to the output glyphs see cairoShowTextGlyphs.
The output values can be readily passed to cairoShowTextGlyphs
cairoShowGlyphs, or related functions, assuming that the exact
same scaled.font is used for the operation.
Since 1.8