# TODO Windows Vista: need to call SetProcessDPIAware? May affect GDI+ calls as well as font. import math import warnings from sys import byteorder import pyglet from pyglet.font import base from pyglet.font import win32query import pyglet.image from pyglet.libs.win32.constants import * from pyglet.libs.win32.context_managers import device_context from pyglet.libs.win32.types import * from pyglet.libs.win32 import _gdi32 as gdi32, _user32 as user32 from pyglet.libs.win32 import _kernel32 as kernel32 from pyglet.util import asbytes _debug_font = pyglet.options['debug_font'] def str_ucs2(text): if byteorder == 'big': text = text.encode('utf_16_be') else: text = text.encode('utf_16_le') # explicit endian avoids BOM return create_string_buffer(text + '\0') _debug_dir = 'debug_font' def _debug_filename(base, extension): import os if not os.path.exists(_debug_dir): os.makedirs(_debug_dir) name = f'{os.path.join(_debug_dir, base)}-{{0}}.{{1}}' num = 1 while os.path.exists(name.format(num, extension)): num += 1 return name.format(num, extension) def _debug_image(image, name): filename = _debug_filename(name, 'png') image.save(filename) _debug(f'Saved image {image} to {filename}') _debug_logfile = None def _debug(msg): global _debug_logfile if not _debug_logfile: _debug_logfile = open(_debug_filename('log', 'txt'), 'wt') _debug_logfile.write(msg + '\n') class Win32GlyphRenderer(base.GlyphRenderer): def __init__(self, font): self._bitmap = None self._dc = None self._bitmap_rect = None super(Win32GlyphRenderer, self).__init__(font) self.font = font # Pessimistically round up width and height to 4 byte alignment width = font.max_glyph_width height = font.ascent - font.descent width = (width | 0x3) + 1 height = (height | 0x3) + 1 self._create_bitmap(width, height) gdi32.SelectObject(self._dc, self.font.hfont) def _create_bitmap(self, width, height): pass def render(self, text): raise NotImplementedError('abstract') class GDIGlyphRenderer(Win32GlyphRenderer): def __del__(self): try: if self._dc: gdi32.DeleteDC(self._dc) if self._bitmap: gdi32.DeleteObject(self._bitmap) except: pass def render(self, text): # Attempt to get ABC widths (only for TrueType) abc = ABC() if gdi32.GetCharABCWidthsW(self._dc, ord(text), ord(text), byref(abc)): width = abc.abcB lsb = abc.abcA advance = abc.abcA + abc.abcB + abc.abcC else: width_buf = c_int() gdi32.GetCharWidth32W(self._dc, ord(text), ord(text), byref(width_buf)) width = width_buf.value lsb = 0 advance = width # Can't get glyph-specific dimensions, use whole line-height. height = self._bitmap_height image = self._get_image(text, width, height, lsb) glyph = self.font.create_glyph(image) glyph.set_bearings(-self.font.descent, lsb, advance) if _debug_font: _debug(f'{self}.render({text})') _debug(f'abc.abcA = {abc.abcA}') _debug(f'abc.abcB = {abc.abcB}') _debug(f'abc.abcC = {abc.abcC}') _debug(f'width = {width}') _debug(f'height = {height}') _debug(f'lsb = {lsb}') _debug(f'advance = {advance}') _debug_image(image, f'glyph_{text}') _debug_image(self.font.textures[0], f'tex_{text}') return glyph def _get_image(self, text, width, height, lsb): # There's no such thing as a greyscale bitmap format in GDI. We can # create an 8-bit palette bitmap with 256 shades of grey, but # unfortunately antialiasing will not work on such a bitmap. So, we # use a 32-bit bitmap and use the red channel as OpenGL's alpha. gdi32.SelectObject(self._dc, self._bitmap) gdi32.SelectObject(self._dc, self.font.hfont) gdi32.SetBkColor(self._dc, 0x0) gdi32.SetTextColor(self._dc, 0x00ffffff) gdi32.SetBkMode(self._dc, OPAQUE) # Draw to DC user32.FillRect(self._dc, byref(self._bitmap_rect), self._black) gdi32.ExtTextOutA(self._dc, -lsb, 0, 0, None, text, len(text), None) gdi32.GdiFlush() # Create glyph object and copy bitmap data to texture image = pyglet.image.ImageData(width, height, 'AXXX', self._bitmap_data, self._bitmap_rect.right * 4) return image def _create_bitmap(self, width, height): self._black = gdi32.GetStockObject(BLACK_BRUSH) self._white = gdi32.GetStockObject(WHITE_BRUSH) if self._dc: gdi32.ReleaseDC(self._dc) if self._bitmap: gdi32.DeleteObject(self._bitmap) pitch = width * 4 data = POINTER(c_byte * (height * pitch))() info = BITMAPINFO() info.bmiHeader.biSize = sizeof(info.bmiHeader) info.bmiHeader.biWidth = width info.bmiHeader.biHeight = height info.bmiHeader.biPlanes = 1 info.bmiHeader.biBitCount = 32 info.bmiHeader.biCompression = BI_RGB self._dc = gdi32.CreateCompatibleDC(None) self._bitmap = gdi32.CreateDIBSection(None, byref(info), DIB_RGB_COLORS, byref(data), None, 0) # Spookiness: the above line causes a "not enough storage" error, # even though that error cannot be generated according to docs, # and everything works fine anyway. Call SetLastError to clear it. kernel32.SetLastError(0) self._bitmap_data = data.contents self._bitmap_rect = RECT() self._bitmap_rect.left = 0 self._bitmap_rect.right = width self._bitmap_rect.top = 0 self._bitmap_rect.bottom = height self._bitmap_height = height if _debug_font: _debug(f'{self}._create_dc({width}, {height})') _debug(f'_dc = {self._dc}') _debug(f'_bitmap = {self._bitmap}') _debug(f'pitch = {pitch}') _debug(f'info.bmiHeader.biSize = {info.bmiHeader.biSize}') class Win32Font(base.Font): glyph_renderer_class = GDIGlyphRenderer def __init__(self, name, size, bold=False, italic=False, stretch=False, dpi=None): super(Win32Font, self).__init__() self.logfont = self.get_logfont(name, size, bold, italic, dpi) self.hfont = gdi32.CreateFontIndirectW(byref(self.logfont)) # Create a dummy DC for coordinate mapping with device_context(None) as dc: metrics = TEXTMETRIC() gdi32.SelectObject(dc, self.hfont) gdi32.GetTextMetricsA(dc, byref(metrics)) self.ascent = metrics.tmAscent self.descent = -metrics.tmDescent self.max_glyph_width = metrics.tmMaxCharWidth def __del__(self): gdi32.DeleteObject(self.hfont) @staticmethod def get_logfont(name, size, bold, italic, dpi): # Create a dummy DC for coordinate mapping with device_context(None) as dc: if dpi is None: dpi = 96 logpixelsy = dpi logfont = LOGFONTW() # Conversion of point size to device pixels logfont.lfHeight = int(-size * logpixelsy // 72) if bold: logfont.lfWeight = FW_BOLD else: logfont.lfWeight = FW_NORMAL logfont.lfItalic = italic logfont.lfFaceName = name logfont.lfQuality = ANTIALIASED_QUALITY return logfont @classmethod def have_font(cls, name): # [ ] add support for loading raster fonts return win32query.have_font(name) @classmethod def add_font_data(cls, data): numfonts = c_uint32() gdi32.AddFontMemResourceEx(data, len(data), 0, byref(numfonts)) # --- GDI+ font rendering --- from pyglet.image.codecs.gdiplus import PixelFormat32bppARGB, gdiplus, Rect from pyglet.image.codecs.gdiplus import ImageLockModeRead, BitmapData DriverStringOptionsCmapLookup = 1 DriverStringOptionsRealizedAdvance = 4 TextRenderingHintAntiAlias = 4 TextRenderingHintAntiAliasGridFit = 3 StringFormatFlagsDirectionRightToLeft = 0x00000001 StringFormatFlagsDirectionVertical = 0x00000002 StringFormatFlagsNoFitBlackBox = 0x00000004 StringFormatFlagsDisplayFormatControl = 0x00000020 StringFormatFlagsNoFontFallback = 0x00000400 StringFormatFlagsMeasureTrailingSpaces = 0x00000800 StringFormatFlagsNoWrap = 0x00001000 StringFormatFlagsLineLimit = 0x00002000 StringFormatFlagsNoClip = 0x00004000 class Rectf(ctypes.Structure): _fields_ = [ ('x', ctypes.c_float), ('y', ctypes.c_float), ('width', ctypes.c_float), ('height', ctypes.c_float), ] class GDIPlusGlyphRenderer(Win32GlyphRenderer): def __del__(self): try: if self._matrix: res = gdiplus.GdipDeleteMatrix(self._matrix) if self._brush: res = gdiplus.GdipDeleteBrush(self._brush) if self._graphics: res = gdiplus.GdipDeleteGraphics(self._graphics) if self._bitmap: res = gdiplus.GdipDisposeImage(self._bitmap) if self._dc: res = user32.ReleaseDC(0, self._dc) except: pass def _create_bitmap(self, width, height): self._data = (ctypes.c_byte * (4 * width * height))() self._bitmap = ctypes.c_void_p() self._format = PixelFormat32bppARGB gdiplus.GdipCreateBitmapFromScan0(width, height, width * 4, self._format, self._data, ctypes.byref(self._bitmap)) self._graphics = ctypes.c_void_p() gdiplus.GdipGetImageGraphicsContext(self._bitmap, ctypes.byref(self._graphics)) gdiplus.GdipSetPageUnit(self._graphics, UnitPixel) self._dc = user32.GetDC(0) gdi32.SelectObject(self._dc, self.font.hfont) gdiplus.GdipSetTextRenderingHint(self._graphics, TextRenderingHintAntiAliasGridFit) self._brush = ctypes.c_void_p() gdiplus.GdipCreateSolidFill(0xffffffff, ctypes.byref(self._brush)) self._matrix = ctypes.c_void_p() gdiplus.GdipCreateMatrix(ctypes.byref(self._matrix)) self._flags = (DriverStringOptionsCmapLookup | DriverStringOptionsRealizedAdvance) self._rect = Rect(0, 0, width, height) self._bitmap_height = height def render(self, text): ch = ctypes.create_unicode_buffer(text) len_ch = len(text) # Layout rectangle; not clipped against so not terribly important. width = 10000 height = self._bitmap_height rect = Rectf(0, self._bitmap_height - self.font.ascent + self.font.descent, width, height) # Set up GenericTypographic with 1 character measure range generic = ctypes.c_void_p() gdiplus.GdipStringFormatGetGenericTypographic(ctypes.byref(generic)) fmt = ctypes.c_void_p() gdiplus.GdipCloneStringFormat(generic, ctypes.byref(fmt)) gdiplus.GdipDeleteStringFormat(generic) # --- Measure advance # XXX HACK HACK HACK # Windows GDI+ is a filthy broken toy. No way to measure the bounding # box of a string, or to obtain LSB. What a joke. # # For historical note, GDI cannot be used because it cannot composite # into a bitmap with alpha. # # It looks like MS have abandoned GDI and GDI+ and are finally # supporting accurate text measurement with alpha composition in .NET # 2.0 (WinForms) via the TextRenderer class; this has no C interface # though, so we're entirely screwed. # # So anyway, we first try to get the width with GdipMeasureString. # Then if it's a TrueType font, we use GetCharABCWidthsW to get the # correct LSB. If it's a negative LSB, we move the layoutRect `rect` # to the right so that the whole glyph is rendered on the surface. # For positive LSB, we let the renderer render the correct white # space and we don't pass the LSB info to the Glyph.set_bearings bbox = Rectf() flags = (StringFormatFlagsMeasureTrailingSpaces | StringFormatFlagsNoClip | StringFormatFlagsNoFitBlackBox) gdiplus.GdipSetStringFormatFlags(fmt, flags) gdiplus.GdipMeasureString(self._graphics, ch, len_ch, self.font._gdipfont, ctypes.byref(rect), fmt, ctypes.byref(bbox), None, None) # We only care about the advance from this whole thing. advance = int(math.ceil(bbox.width)) # GDI functions only work for a single character so we transform # grapheme \r\n into \r if text == '\r\n': text = '\r' # XXX END HACK HACK HACK abc = ABC() width = 0 lsb = 0 ttf_font = True # Use GDI to get code points for the text passed. This is almost always 1. # For special unicode characters it may be comprised of 2+ codepoints. Get the width/lsb of each. # Function only works on TTF fonts. for codepoint in [ord(c) for c in text]: if gdi32.GetCharABCWidthsW(self._dc, codepoint, codepoint, byref(abc)): lsb += abc.abcA width += abc.abcB if lsb < 0: # Negative LSB: we shift the layout rect to the right # Otherwise we will cut the left part of the glyph rect.x = -lsb width -= lsb else: width += lsb else: ttf_font = False break # Almost always a TTF font. Haven't seen a modern font that GetCharABCWidthsW fails on. # For safety, just use the advance as the width. if not ttf_font: width = advance # This hack bumps up the width if the font is italic; # this compensates for some common fonts. It's also a stupid # waste of texture memory. if self.font.italic: width += width // 2 # Do not enlarge more than the _rect width. width = min(width, self._rect.Width) # Draw character to bitmap gdiplus.GdipGraphicsClear(self._graphics, 0x00000000) gdiplus.GdipDrawString(self._graphics, ch, len_ch, self.font._gdipfont, ctypes.byref(rect), fmt, self._brush) gdiplus.GdipFlush(self._graphics, 1) gdiplus.GdipDeleteStringFormat(fmt) bitmap_data = BitmapData() gdiplus.GdipBitmapLockBits(self._bitmap, byref(self._rect), ImageLockModeRead, self._format, byref(bitmap_data)) # Create buffer for RawImage buffer = create_string_buffer( bitmap_data.Stride * bitmap_data.Height) memmove(buffer, bitmap_data.Scan0, len(buffer)) # Unlock data gdiplus.GdipBitmapUnlockBits(self._bitmap, byref(bitmap_data)) image = pyglet.image.ImageData(width, height, 'BGRA', buffer, -bitmap_data.Stride) glyph = self.font.create_glyph(image) # Only pass negative LSB info lsb = min(lsb, 0) glyph.set_bearings(-self.font.descent, lsb, advance) return glyph FontStyleBold = 1 FontStyleItalic = 2 UnitPixel = 2 UnitPoint = 3 class GDIPlusFont(Win32Font): glyph_renderer_class = GDIPlusGlyphRenderer _private_fonts = None _default_name = 'Arial' def __init__(self, name, size, bold=False, italic=False, stretch=False, dpi=None): if not name: name = self._default_name # assert type(bold) is bool, "Only a boolean value is supported for bold in the current font renderer." # assert type(italic) is bool, "Only a boolean value is supported for bold in the current font renderer." if stretch: warnings.warn("The current font render does not support stretching.") super().__init__(name, size, bold, italic, stretch, dpi) self._name = name family = ctypes.c_void_p() name = ctypes.c_wchar_p(name) # Look in private collection first: if self._private_fonts: gdiplus.GdipCreateFontFamilyFromName(name, self._private_fonts, ctypes.byref(family)) # Then in system collection: if not family: gdiplus.GdipCreateFontFamilyFromName(name, None, ctypes.byref(family)) # Nothing found, use default font. if not family: self._name = self._default_name gdiplus.GdipCreateFontFamilyFromName(ctypes.c_wchar_p(self._name), None, ctypes.byref(family)) if dpi is None: unit = UnitPoint self.dpi = 96 else: unit = UnitPixel size = (size * dpi) // 72 self.dpi = dpi style = 0 if bold: style |= FontStyleBold if italic: style |= FontStyleItalic self._gdipfont = ctypes.c_void_p() gdiplus.GdipCreateFont(family, ctypes.c_float(size), style, unit, ctypes.byref(self._gdipfont)) gdiplus.GdipDeleteFontFamily(family) @property def name(self): return self._name def __del__(self): super(GDIPlusFont, self).__del__() gdiplus.GdipDeleteFont(self._gdipfont) @classmethod def add_font_data(cls, data): super(GDIPlusFont, cls).add_font_data(data) if not cls._private_fonts: cls._private_fonts = ctypes.c_void_p() gdiplus.GdipNewPrivateFontCollection( ctypes.byref(cls._private_fonts)) gdiplus.GdipPrivateAddMemoryFont(cls._private_fonts, data, len(data)) @classmethod def have_font(cls, name): family = ctypes.c_void_p() # Look in private collection first: num_count = ctypes.c_int() gdiplus.GdipGetFontCollectionFamilyCount( cls._private_fonts, ctypes.byref(num_count)) gpfamilies = (ctypes.c_void_p * num_count.value)() numFound = ctypes.c_int() gdiplus.GdipGetFontCollectionFamilyList( cls._private_fonts, num_count, gpfamilies, ctypes.byref(numFound)) font_name = ctypes.create_unicode_buffer(32) for gpfamily in gpfamilies: gdiplus.GdipGetFamilyName(gpfamily, font_name, '\0') if font_name.value == name: return True # Else call parent class for system fonts return super(GDIPlusFont, cls).have_font(name)