| 139 | |
| 140 | |
| 141 | def latex_to_png_dvipng(s, wrap, color='Black', scale=1.0): |
| 142 | try: |
| 143 | find_cmd('latex') |
| 144 | find_cmd('dvipng') |
| 145 | except FindCmdError: |
| 146 | return None |
| 147 | |
| 148 | startupinfo = None |
| 149 | if os.name == "nt": |
| 150 | # prevent popup-windows |
| 151 | startupinfo = subprocess.STARTUPINFO() |
| 152 | startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW |
| 153 | |
| 154 | try: |
| 155 | workdir = Path(tempfile.mkdtemp()) |
| 156 | tmpfile = "tmp.tex" |
| 157 | dvifile = "tmp.dvi" |
| 158 | outfile = "tmp.png" |
| 159 | |
| 160 | with workdir.joinpath(tmpfile).open("w", encoding="utf8") as f: |
| 161 | f.writelines(genelatex(s, wrap)) |
| 162 | |
| 163 | subprocess.check_call( |
| 164 | ["latex", "-halt-on-error", "-interaction", "batchmode", tmpfile], |
| 165 | cwd=workdir, |
| 166 | stdout=subprocess.DEVNULL, |
| 167 | stderr=subprocess.DEVNULL, |
| 168 | startupinfo=startupinfo, |
| 169 | ) |
| 170 | |
| 171 | resolution = round(150 * scale) |
| 172 | subprocess.check_call( |
| 173 | [ |
| 174 | "dvipng", |
| 175 | "-T", |
| 176 | "tight", |
| 177 | "-D", |
| 178 | str(resolution), |
| 179 | "-z", |
| 180 | "9", |
| 181 | "-bg", |
| 182 | "Transparent", |
| 183 | "-o", |
| 184 | outfile, |
| 185 | dvifile, |
| 186 | "-fg", |
| 187 | color, |
| 188 | ], |
| 189 | cwd=workdir, |
| 190 | stdout=subprocess.DEVNULL, |
| 191 | stderr=subprocess.DEVNULL, |
| 192 | startupinfo=startupinfo, |
| 193 | ) |
| 194 | |
| 195 | with workdir.joinpath(outfile).open("rb") as f: |
| 196 | return f.read() |
| 197 | except subprocess.CalledProcessError: |
| 198 | return None |