/****************************************************************************** FontMetrics.c Purpose: This file provides access to fontmetrics, a line breaking algorithm for text wrapping, and string width calculations, metrics for the 14 standard PDF fonts are defined below ******************************************************************************/ #include #include #include /* Generated From .afm files for the 14 Core PDF fonts see:- */ /* http://partners.adobe.com/asn/developer/technotes/acrobatpdf.html */ panda_fontmetric fontmetrics[] = { {"/Courier", {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 600, 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873, 927, 970, 918}}, {"*", {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}, NULL }; /* Locate the metric for the currently selected font, if not available fall */ /* back on the empty "*" font metric (all zero widths, so no wrapping */ panda_fontmetric * panda_getfontmetric (panda_pdf * output) { char *fontname; panda_object *font = NULL; panda_fontmetric *fontmetric = &fontmetrics[0]; font = panda_getfontobj (output, output->currentFont); fontname = panda_finddictitem (output, font, "BaseFont"); fontname = panda_dbread (output, fontname); while (fontmetric && fontmetric->fontName && (strcasecmp (fontmetric->fontName, fontname) != 0 && strcasecmp (fontmetric->fontName, "*") != 0)) { fontmetric = fontmetric++; } /* can't do anything without some metrics */ if (!fontmetric || !fontmetric->fontName) { panda_error (panda_true, "Unable to locate font metrics"); return NULL; } return fontmetric; } /* Calculate the width of c using the specified fontmetric and the text settings */ double panda_charwidth (panda_pdf * output, char c, panda_fontmetric * fontmetric, int addCharSpacing) { double w = 0.0; w = (double) fontmetric->characterWidth[c] * (double) output->currentFontSize / (double) 1000; if (c == ' ') w += (double) output->currentWordSpacing; if (addCharSpacing) w += (double) output->currentCharacterSpacing; return (w * output->currentHorizontalScaling); } /* Calculate the width of text using the specified fontmetric and the text settings */ /* if the fontmetric is specified as NULL then look them up for the current font */ /* as specified in output */ double panda_stringwidth (panda_pdf * output, char *text, panda_fontmetric * fontmetric) { double width = 0; double toPoints; int i = 0; /* Empty string has no length */ if (!text) return 0; if (!fontmetric) { fontmetric = panda_getfontmetric (output); } if (!fontmetric) { return -1; } toPoints = ((double) output->currentFontSize) / 1000; for (i = 0; i < strlen (text); i++) { width += ((double) fontmetric->characterWidth[text[i]]) * toPoints; if (text[i] == ' ') { width += output->currentWordSpacing; } else if (i > 1) { width += output->currentCharacterSpacing; } } /* Adjust for Horizontal Scaling */ width *= output->currentHorizontalScaling; return width; } /* Find the next logical line break in text for the current font settings, */ /* assuming a maximum width of wrapWidth, if lineWidth is non NULL store the */ /* actual line width (in points) into it, return the number of character to */ /* the next line break */ int panda_findlinebreak (panda_pdf * output, char *text, panda_fontmetric * fontmetric, int wrapwidth, double *lineWidth) { char *p, *lastSpace = NULL; double w = 0, cw, lastSpaceWidth = 0.0; /* Num chars is p-text */ for (p = text; p != NULL && *p != '\0'; p++) { switch (*p) { /* fall through if not followed by a \n (ie is aMac line */ /* break) Otherwise this is part of a \r\n and well get */ /* it on the next iteration */ case '\r': if (*(p + 1) != '\n') { break; } /* If we got this far then we are at a forced wrap, what */ /* we have so far will fit within wrapwidth */ case '\n': if (lineWidth != NULL) { *lineWidth = w; } return (int) (p - text + 1); break; /* Super/Subscript start, just eat the next character */ /* since it is the value for the vertical offset */ case 4: case 5: *p++; break; /* Normal script this would probably be ok in default: */ case 6: break; /* Fall through */ case ' ': lastSpace = p; lastSpaceWidth = w; default: cw = panda_charwidth (output, *p, fontmetric, (p > text) ? 1 : 0); if (cw + w > wrapwidth) { /* At the end */ if (lastSpace) { cw = panda_charwidth (output, ' ', fontmetric, 1); w = lastSpaceWidth + cw; while (*lastSpace == ' ' && lastSpace > text) { lastSpace--; w -= cw; } if (lineWidth != NULL) { *lineWidth = w; } return (int) (lastSpace - text + 1); } else { if (lineWidth != NULL) { *lineWidth = w; } return (int) (p - text); } } w += cw; break; } } if (lineWidth != NULL) { *lineWidth = w; } return (int) (p - text); }