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-rw-r--r--fontink.c216
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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 <X11/fonts/fntfilst.h>
+#include <X11/fonts/bitmap.h>
+#include <X11/fonts/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)
+{
+ int x,
+ y;
+ 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 (y = y_min; y < y_max; y++) {
+ for (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 (y = y_min; y < y_max; y++) {
+ for (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;
+ }
+ }
+}
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