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IABSD.fr/xenocara/app/bdftopcf/fontink.c
matthieu
- app/bdftopcf/fontink.c
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/* Copyright 1990, 1998 The Open Group Permission to use, copy, modify, distribute, and sell this software and its documentation for any purpose is hereby granted without fee, provided that the above copyright notice appear in all copies and that both that copyright notice and this permission notice appear in supporting documentation. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The Open Group. */ /* * Author: Keith Packard, MIT X Consortium */ #ifdef HAVE_CONFIG_H #include <config.h> #endif #include "fntfilst.h" #include "bitmap.h" #include "bdfint.h" static unsigned char ink_mask_msb[8] = { 0x80, 0x40, 0x20, 0x10, 0x08, 0x04, 0x02, 0x01, }; static unsigned char ink_mask_lsb[8] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80, }; void FontCharInkMetrics(FontPtr pFont, CharInfoPtr pCI, xCharInfo * pInk) { int leftBearing, ascent, descent; register int vpos, hpos, bpos = 0; int bitmapByteWidth, bitmapByteWidthPadded; int bitmapBitWidth; int span; register unsigned char *p; unsigned char *ink_mask = 0; register int bmax; register unsigned char charbits; if (pFont->bit == MSBFirst) ink_mask = ink_mask_msb; else if (pFont->bit == LSBFirst) ink_mask = ink_mask_lsb; pInk->characterWidth = pCI->metrics.characterWidth; pInk->attributes = pCI->metrics.attributes; leftBearing = pCI->metrics.leftSideBearing; ascent = pCI->metrics.ascent; descent = pCI->metrics.descent; bitmapBitWidth = GLYPHWIDTHPIXELS(pCI); bitmapByteWidth = GLYPHWIDTHBYTES(pCI); bitmapByteWidthPadded = BYTES_PER_ROW(bitmapBitWidth, pFont->glyph); span = bitmapByteWidthPadded - bitmapByteWidth; p = (unsigned char *) pCI->bits; for (vpos = descent + ascent; --vpos >= 0;) { for (hpos = bitmapByteWidth; --hpos >= 0;) { if (*p++ != 0) goto found_ascent; } p += span; } /* * special case -- font with no bits gets all zeros */ pInk->leftSideBearing = leftBearing; pInk->rightSideBearing = leftBearing; pInk->ascent = 0; pInk->descent = 0; return; found_ascent: pInk->ascent = vpos - descent + 1; p = ((unsigned char *) pCI->bits) + bitmapByteWidthPadded * (descent + ascent - 1) + bitmapByteWidth; for (vpos = descent + ascent; --vpos >= 0;) { for (hpos = bitmapByteWidth; --hpos >= 0;) { if (*--p != 0) goto found_descent; } p -= span; } found_descent: pInk->descent = vpos - ascent + 1; bmax = 8; for (hpos = 0; hpos < bitmapByteWidth; hpos++) { charbits = 0; p = (unsigned char *) pCI->bits + hpos; for (vpos = descent + ascent; --vpos >= 0; p += bitmapByteWidthPadded) charbits |= *p; if (charbits) { if (hpos == bitmapByteWidth - 1) bmax = bitmapBitWidth - (hpos << 3); p = ink_mask; for (bpos = bmax; --bpos >= 0;) { if (charbits & *p++) goto found_left; } } } found_left: pInk->leftSideBearing = leftBearing + (hpos << 3) + bmax - bpos - 1; bmax = bitmapBitWidth - ((bitmapByteWidth - 1) << 3); for (hpos = bitmapByteWidth; --hpos >= 0;) { charbits = 0; p = (unsigned char *) pCI->bits + hpos; for (vpos = descent + ascent; --vpos >= 0; p += bitmapByteWidthPadded) charbits |= *p; if (charbits) { p = ink_mask + bmax; for (bpos = bmax; --bpos >= 0;) { if (charbits & *--p) goto found_right; } } bmax = 8; } found_right: pInk->rightSideBearing = leftBearing + (hpos << 3) + bpos + 1; } #define ISBITONMSB(x, line) ((line)[(x)/8] & (1 << (7-((x)%8)))) #define SETBITMSB(x, line) ((line)[(x)/8] |= (1 << (7-((x)%8)))) #define ISBITONLSB(x, line) ((line)[(x)/8] & (1 << ((x)%8))) #define SETBITLSB(x, line) ((line)[(x)/8] |= (1 << ((x)%8))) #define Min(a,b) ((a)<(b)?(a):(b)) #define Max(a,b) ((a)>(b)?(a):(b)) void FontCharReshape(FontPtr pFont, CharInfoPtr pSrc, CharInfoPtr pDst) { unsigned char *in_line, *out_line; unsigned char *oldglyph, *newglyph; int inwidth; int outwidth, outheight; int out_bytes, in_bytes; int y_min, y_max, x_min, x_max; newglyph = (unsigned char *) pDst->bits; outwidth = pDst->metrics.rightSideBearing - pDst->metrics.leftSideBearing; outheight = pDst->metrics.descent + pDst->metrics.ascent; out_bytes = BYTES_PER_ROW(outwidth, pFont->glyph); oldglyph = (unsigned char *) pSrc->bits; inwidth = pSrc->metrics.rightSideBearing - pSrc->metrics.leftSideBearing; in_bytes = BYTES_PER_ROW(inwidth, pFont->glyph); bzero(newglyph, out_bytes * outheight); in_line = oldglyph; out_line = newglyph; y_min = Max(-pSrc->metrics.ascent, -pDst->metrics.ascent); y_max = Min(pSrc->metrics.descent, pDst->metrics.descent); x_min = Max(pSrc->metrics.leftSideBearing, pDst->metrics.leftSideBearing); x_max = Min(pSrc->metrics.rightSideBearing, pDst->metrics.rightSideBearing); in_line += (y_min + pSrc->metrics.ascent) * in_bytes; out_line += (y_min + pDst->metrics.ascent) * out_bytes; if (pFont->bit == MSBFirst) { for (int y = y_min; y < y_max; y++) { for (int x = x_min; x < x_max; x++) { if (ISBITONMSB(x - pSrc->metrics.leftSideBearing, in_line)) SETBITMSB(x - pDst->metrics.leftSideBearing, out_line); } in_line += in_bytes; out_line += out_bytes; } } else { for (int y = y_min; y < y_max; y++) { for (int x = x_min; x < x_max; x++) { if (ISBITONLSB(x - pSrc->metrics.leftSideBearing, in_line)) SETBITLSB(x - pDst->metrics.leftSideBearing, out_line); } in_line += in_bytes; out_line += out_bytes; } } }