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# skia_ot_svg_module
# Copyright 2023 Hin-Tak Leung
# Typical usage:
#
# from freetype import get_handle, FT_Property_Set
# from skia_ot_svg_module import hooks
# ...
# library = get_handle()
# FT_Property_Set( library, b"ot-svg", b"svg-hooks", byref(hooks) )
#
# After these lines (or equivalent), COLOR OT-SVG font support is enabled.
# You just use freetype-py as usual. Color bitmaps are returned for OT-SVG
# fonts in FT_Load_Char()/FT_Load_Glyph().
from freetype import FT_SVG_Document, FT_Err_Ok, SVG_RendererHooks, \
SVG_Lib_Init_Func, SVG_Lib_Free_Func, SVG_Lib_Render_Func, \
SVG_Lib_Preset_Slot_Func, SizeMetrics, FT_UShort, FT_PIXEL_MODE_BGRA, \
FT_GLYPH_FORMAT_BITMAP
import ctypes
from ctypes import py_object, pythonapi, cast, c_char_p
import skia
from skia import Size, ImageInfo, ColorType, AlphaType, Canvas, \
PictureRecorder, Rect, ScalarNegativeInfinity, ScalarInfinity, RTreeFactory
from packaging import version
assert(version.parse(skia.__version__) > version.parse("116.0b2")), "Needs Skia-Python 116.0b2+"
pythonapi.PyMemoryView_FromMemory.restype = py_object
# include/private/base/SkFixed.h
def SkFixedToFloat(x):
return ((x) * 1.52587890625e-5)
from math import ceil, floor
_state = None
def svg_init(ctx):
global _state
_state = {}
ctx.contents.value = _state
return FT_Err_Ok
def svg_free(ctx):
global _state
_state = None
# "None" is strictly speaking a special pyobject,
# this line does not do what it should, i.e. setting the
# pointer to NULL.
ctx.contents = None
return # void
def svg_render(slot, ctx):
state = ctx.contents.value
dstBitmap = skia.Bitmap()
dstBitmap.setInfo(ImageInfo.Make(slot.contents.bitmap.width, slot.contents.bitmap.rows,
ColorType.kBGRA_8888_ColorType,
AlphaType.kPremul_AlphaType),
slot.contents.bitmap.pitch)
dstBitmap.setPixels(pythonapi.PyMemoryView_FromMemory(cast(slot.contents.bitmap.buffer, c_char_p),
slot.contents.bitmap.rows * slot.contents.bitmap.pitch,
0x200), # Read-Write
)
canvas = Canvas(dstBitmap)
canvas.clear(skia.ColorTRANSPARENT)
canvas.translate( -state['x'], -state['y'] )
canvas.drawPicture( state['picture'] )
slot.contents.bitmap.pixel_mode = FT_PIXEL_MODE_BGRA
slot.contents.bitmap.num_grays = 256
slot.contents.format = FT_GLYPH_FORMAT_BITMAP
state['picture'] = None
return FT_Err_Ok
def svg_preset_slot(slot, cached, ctx):
state = ctx.contents.value
document = ctypes.cast(slot.contents.other, FT_SVG_Document)
metrics = SizeMetrics(document.contents.metrics)
units_per_EM = FT_UShort(document.contents.units_per_EM)
end_glyph_id = FT_UShort(document.contents.end_glyph_id)
start_glyph_id = FT_UShort(document.contents.start_glyph_id)
doc = ctypes.string_at(document.contents.svg_document, # not terminated
size=document.contents.svg_document_length)
data = skia.Data(doc)
svgmem = skia.MemoryStream(data)
svg = skia.SVGDOM.MakeFromStream(svgmem)
if (svg.containerSize().isEmpty()):
size = Size.Make(units_per_EM.value, units_per_EM.value)
svg.setContainerSize(size)
recorder = PictureRecorder()
infiniteRect = Rect.MakeLTRB(ScalarNegativeInfinity, ScalarNegativeInfinity,
ScalarInfinity, ScalarInfinity)
bboxh = RTreeFactory()()
recordingCanvas = recorder.beginRecording(infiniteRect, bboxh)
ftMatrix = document.contents.transform
ftOffset = document.contents.delta
m = skia.Matrix()
m.setAll(
SkFixedToFloat(ftMatrix.xx), -SkFixedToFloat(ftMatrix.xy), SkFixedToFloat(ftOffset.x),
-SkFixedToFloat(ftMatrix.yx), SkFixedToFloat(ftMatrix.yy), -SkFixedToFloat(ftOffset.y),
0 , 0 , 1 )
m.postScale(SkFixedToFloat(document.contents.metrics.x_scale) / 64.0,
SkFixedToFloat(document.contents.metrics.y_scale) / 64.0)
recordingCanvas.concat(m)
if ( start_glyph_id.value < end_glyph_id.value ):
id = "glyph%u" % ( slot.contents.glyph_index )
svg.renderNode(recordingCanvas, id)
else:
svg.render(recordingCanvas)
state['picture'] = recorder.finishRecordingAsPicture()
bounds = state['picture'].cullRect()
width = ceil(bounds.right()) - floor(bounds.left())
height = ceil(bounds.bottom()) - floor(bounds.top())
x = floor(bounds.left())
y = floor(bounds.top())
state['x'] = x
state['y'] = y
slot.contents.bitmap_left = int(state['x']) # float to int conversion
slot.contents.bitmap_top = int(-state['y'])
slot.contents.bitmap.rows = ceil( height ) # float to int
slot.contents.bitmap.width = ceil( width )
slot.contents.bitmap.pitch = slot.contents.bitmap.width * 4
slot.contents.bitmap.pixel_mode = FT_PIXEL_MODE_BGRA
metrics_width = width
metrics_height = height
horiBearingX = state['x']
horiBearingY = -state['y']
vertBearingX = slot.contents.metrics.horiBearingX / 64.0 - slot.contents.metrics.horiAdvance / 64.0 / 2
vertBearingY = ( slot.contents.metrics.vertAdvance / 64.0 - slot.contents.metrics.height / 64.0 ) / 2
slot.contents.metrics.width = int(round( width * 64 ))
slot.contents.metrics.height = int(round( height * 64 ))
slot.contents.metrics.horiBearingX = int( horiBearingX * 64 )
slot.contents.metrics.horiBearingY = int( horiBearingY * 64 )
slot.contents.metrics.vertBearingX = int( vertBearingX * 64 )
slot.contents.metrics.vertBearingY = int( vertBearingY * 64 )
if ( slot.contents.metrics.vertAdvance == 0 ):
slot.contents.metrics.vertAdvance = int( height * 1.2 * 64 )
if ( cached == False ):
state['picture'] = None
state['x'] = 0
state['y'] = 0
return FT_Err_Ok
hooks = SVG_RendererHooks(svg_init=SVG_Lib_Init_Func(svg_init),
svg_free=SVG_Lib_Free_Func(svg_free),
svg_render=SVG_Lib_Render_Func(svg_render),
svg_preset_slot=SVG_Lib_Preset_Slot_Func(svg_preset_slot))
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