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comparison src/redisplay-output.c @ 819:6504113e7c2d

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[xemacs-hg @ 2002-04-25 18:03:23 by andyp] sync up windows branch from 21.4
author andyp
date Thu, 25 Apr 2002 18:04:24 +0000
parents a5954632b187
children 6728e641994e
comparison
equal deleted inserted replaced
818:accc481aef34 819:6504113e7c2d
230 crb->object.hline.yoffset != drb->object.hline.yoffset)) 230 crb->object.hline.yoffset != drb->object.hline.yoffset))
231 return 0; 231 return 0;
232 else if (crb->type == RUNE_DGLYPH && 232 else if (crb->type == RUNE_DGLYPH &&
233 (!EQ (crb->object.dglyph.glyph, drb->object.dglyph.glyph) || 233 (!EQ (crb->object.dglyph.glyph, drb->object.dglyph.glyph) ||
234 !EQ (crb->object.dglyph.extent, drb->object.dglyph.extent) || 234 !EQ (crb->object.dglyph.extent, drb->object.dglyph.extent) ||
235 crb->object.dglyph.xoffset != drb->object.dglyph.xoffset)) 235 crb->object.dglyph.xoffset != drb->object.dglyph.xoffset ||
236 crb->object.dglyph.yoffset != drb->object.dglyph.yoffset ||
237 crb->object.dglyph.ascent != drb->object.dglyph.ascent ||
238 crb->object.dglyph.descent != drb->object.dglyph.descent))
236 return 0; 239 return 0;
237 /* Only check dirtiness if we know something has changed. */ 240 /* Only check dirtiness if we know something has changed. */
238 else if (crb->type == RUNE_DGLYPH && 241 else if (crb->type == RUNE_DGLYPH &&
239 (XGLYPH_DIRTYP (crb->object.dglyph.glyph) || 242 (XGLYPH_DIRTYP (crb->object.dglyph.glyph) ||
240 crb->findex != drb->findex)) 243 crb->findex != drb->findex))
1546 1549
1547 1550
1548 dga->height = IMAGE_INSTANCE_PIXMAP_HEIGHT (p); 1551 dga->height = IMAGE_INSTANCE_PIXMAP_HEIGHT (p);
1549 dga->width = IMAGE_INSTANCE_PIXMAP_WIDTH (p); 1552 dga->width = IMAGE_INSTANCE_PIXMAP_WIDTH (p);
1550 1553
1554 #ifdef DEBUG_REDISPLAY
1555 printf ("redisplay_output_pixmap(request) \
1556 [%dx%d@%d+%d] in [%dx%d@%d+%d]\n",
1557 db->width, db->height, db->xpos, db->ypos,
1558 dga->width, dga->height, dga->xoffset, dga->yoffset);
1559 #endif
1560
1551 /* This makes the glyph area fit into the display area. */ 1561 /* This makes the glyph area fit into the display area. */
1552 if (!redisplay_normalize_glyph_area (db, dga)) 1562 if (!redisplay_normalize_glyph_area (db, dga))
1553 return; 1563 return;
1564
1565 #ifdef DEBUG_REDISPLAY
1566 printf ("redisplay_output_pixmap(normalized) \
1567 [%dx%d@%d+%d] in [%dx%d@%d+%d]\n",
1568 db->width, db->height, db->xpos, db->ypos,
1569 dga->width, dga->height, dga->xoffset, dga->yoffset);
1570 #endif
1554 1571
1555 /* Clear the area the pixmap is going into. The pixmap itself will 1572 /* Clear the area the pixmap is going into. The pixmap itself will
1556 always take care of the full width. We don't want to clear where 1573 always take care of the full width. We don't want to clear where
1557 it is going to go in order to avoid flicker. So, all we have to 1574 it is going to go in order to avoid flicker. So, all we have to
1558 take care of is any area above or below the pixmap. If the pixmap 1575 take care of is any area above or below the pixmap. If the pixmap
1743 1760
1744 /***************************************************************************** 1761 /*****************************************************************************
1745 redisplay_normalize_glyph_area 1762 redisplay_normalize_glyph_area
1746 redisplay_normalize_display_box 1763 redisplay_normalize_display_box
1747 1764
1748 Calculate the visible box for displaying src in dest. 1765 Calculate the visible box for displaying glyphsrc in dest.
1766
1767 display_box and display_glyph_area are used to represent an area to
1768 displayed and where to display it. Using these two structures all
1769 combinations of clipping and position can be accommodated.
1770
1771 dest - display_box
1772
1773 xpos - absolute horizontal position of area.
1774
1775 ypos - absolute vertical position of area.
1776
1777 glyphsrc - display_glyph_area
1778
1779 xoffset - horizontal offset of the glyph, +ve means display
1780 the glyph with the x position offset by xoffset, -ve means
1781 display starting xoffset into the glyph.
1782
1783 yoffset - vertical offset of the glyph, +ve means display the
1784 glyph with y position offset by yoffset, -ve means display
1785 starting xoffset into the glyph.
1786
1749 ****************************************************************************/ 1787 ****************************************************************************/
1750 int 1788 int
1751 redisplay_normalize_glyph_area (struct display_box* dest, 1789 redisplay_normalize_glyph_area (struct display_box* dest,
1752 struct display_glyph_area* glyphsrc) 1790 struct display_glyph_area* glyphsrc)
1753 { 1791 {
1771 { 1809 {
1772 /* It's all clipped out */ 1810 /* It's all clipped out */
1773 return 0; 1811 return 0;
1774 } 1812 }
1775 1813
1776 /* Horizontal offsets. This works because xoffset can be -ve as well as +ve */ 1814 /* Horizontal offsets. This works because xoffset can be -ve as well
1815 as +ve. When we enter this function the glyphsrc width and
1816 height are set to the actual glyph width and height irrespective
1817 of how much can be displayed. We are trying to clip both the
1818 offset into the image and the rightmost bounding box. Its
1819 possible for the glyph width to be much larger than the area we
1820 are displaying into (e.g. a large glyph in a small frame). */
1777 if (dest->xpos + glyphsrc->xoffset + glyphsrc->width > dest->xpos + dest->width) 1821 if (dest->xpos + glyphsrc->xoffset + glyphsrc->width > dest->xpos + dest->width)
1778 { 1822 {
1823 /* glyphsrc offset is +ve we are trying to display offset from the
1824 origin (the bounding box contains some space and then the
1825 glyph). At most the width we want to display is dest->width -
1826 glyphsrc->xoffset. */
1779 if (glyphsrc->xoffset > 0) 1827 if (glyphsrc->xoffset > 0)
1780 glyphsrc->width = dest->width - glyphsrc->xoffset; 1828 glyphsrc->width = dest->width - glyphsrc->xoffset;
1829 /* glyphsrc offset is -ve we are trying to display hard up
1830 against the dest corner inset into the glyphsrc by
1831 xoffset.*/
1832 else if (glyphsrc->xoffset < 0)
1833 {
1834 glyphsrc->width += glyphsrc->xoffset;
1835 glyphsrc->width = min (glyphsrc->width, dest->width);
1836 }
1781 else 1837 else
1782 glyphsrc->width = dest->width; 1838 glyphsrc->width = dest->width;
1783 } 1839 }
1784 1840
1785 if (glyphsrc->xoffset < 0) 1841 else if (glyphsrc->xoffset < 0)
1786 glyphsrc->width += glyphsrc->xoffset; 1842 glyphsrc->width += glyphsrc->xoffset;
1787 1843
1788 /* Vertical offsets. This works because yoffset can be -ve as well as +ve */ 1844 /* Vertical offsets. This works because yoffset can be -ve as well as +ve */
1789 if (dest->ypos + glyphsrc->yoffset + glyphsrc->height > dest->ypos + dest->height) 1845 if (dest->ypos + glyphsrc->yoffset + glyphsrc->height > dest->ypos + dest->height)
1790 { 1846 {
1791 if (glyphsrc->yoffset > 0) 1847 if ((glyphsrc->yoffset > 0) && (dest->height > glyphsrc->yoffset))
1792 glyphsrc->height = dest->height - glyphsrc->yoffset; 1848 glyphsrc->height = dest->height - glyphsrc->yoffset;
1849 else if (glyphsrc->yoffset < 0)
1850 {
1851 glyphsrc->height += glyphsrc->yoffset;
1852 glyphsrc->height = min (glyphsrc->height, dest->height);
1853 }
1793 else 1854 else
1794 glyphsrc->height = dest->height; 1855 glyphsrc->height = dest->height;
1795 } 1856 }
1796 1857
1797 if (glyphsrc->yoffset < 0) 1858 else if (glyphsrc->yoffset < 0)
1798 glyphsrc->height += glyphsrc->yoffset; 1859 glyphsrc->height += glyphsrc->yoffset;
1799 1860
1800 return 1; 1861 return 1;
1801 } 1862 }
1802 1863
1877 Convert from rune/display_line co-ordinates to display_box 1938 Convert from rune/display_line co-ordinates to display_box
1878 co-ordinates. 1939 co-ordinates.
1879 ****************************************************************************/ 1940 ****************************************************************************/
1880 int 1941 int
1881 redisplay_calculate_display_boxes (struct display_line *dl, int xpos, 1942 redisplay_calculate_display_boxes (struct display_line *dl, int xpos,
1882 int xoffset, int start_pixpos, int width, 1943 int xoffset, int yoffset, int start_pixpos,
1883 struct display_box* dest, 1944 int width, struct display_box* dest,
1884 struct display_glyph_area* src) 1945 struct display_glyph_area* src)
1885 { 1946 {
1886 dest->xpos = xpos; 1947 dest->xpos = xpos;
1887 dest->ypos = DISPLAY_LINE_YPOS (dl); 1948 dest->ypos = DISPLAY_LINE_YPOS (dl);
1888 dest->width = width; 1949 dest->width = width;
1889 dest->height = DISPLAY_LINE_HEIGHT (dl); 1950 dest->height = DISPLAY_LINE_HEIGHT (dl);
1890 1951
1891 src->xoffset = -xoffset; 1952 src->xoffset = -xoffset;
1892 src->yoffset = -dl->top_clip;
1893 src->width = 0; 1953 src->width = 0;
1894 src->height = 0; 1954 src->height = 0;
1955
1956 src->yoffset = -dl->top_clip + yoffset;
1895 1957
1896 if (start_pixpos >=0 && start_pixpos > xpos) 1958 if (start_pixpos >=0 && start_pixpos > xpos)
1897 { 1959 {
1898 /* Oops, we're asking for a start outside of the displayable 1960 /* Oops, we're asking for a start outside of the displayable
1899 area. */ 1961 area. */