diff options
| author | rsc <devnull@localhost> | 2005-01-14 03:45:44 +0000 |
|---|---|---|
| committer | rsc <devnull@localhost> | 2005-01-14 03:45:44 +0000 |
| commit | 78e51a8c6678b6e3dff3d619aa786669f531f4bc (patch) | |
| tree | 015e00fde4fc837fd31b705e18d17dc913829388 /man/man3/memdraw.html | |
| parent | 2634795b5f0053bc0ff08e5d7bbc0eda8efea061 (diff) | |
| download | plan9port-78e51a8c6678b6e3dff3d619aa786669f531f4bc.tar.gz plan9port-78e51a8c6678b6e3dff3d619aa786669f531f4bc.tar.bz2 plan9port-78e51a8c6678b6e3dff3d619aa786669f531f4bc.zip | |
checkpoint
Diffstat (limited to 'man/man3/memdraw.html')
| -rw-r--r-- | man/man3/memdraw.html | 466 |
1 files changed, 466 insertions, 0 deletions
diff --git a/man/man3/memdraw.html b/man/man3/memdraw.html new file mode 100644 index 00000000..57a0c96c --- /dev/null +++ b/man/man3/memdraw.html @@ -0,0 +1,466 @@ +<head> +<title>memdraw(3) - Plan 9 from User Space</title> +<meta content="text/html; charset=utf-8" http-equiv=Content-Type> +</head> +<body bgcolor=#ffffff> +<table border=0 cellpadding=0 cellspacing=0 width=100%> +<tr height=10><td> +<tr><td width=20><td> +<tr><td width=20><td><b>MEMDRAW(3)</b><td align=right><b>MEMDRAW(3)</b> +<tr><td width=20><td colspan=2> + <br> +<p><font size=+1><b>NAME </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + Memimage, Memdata, Memdrawparam, memimageinit, wordaddr, byteaddr, + memimagemove, allocmemimage, allocmemimaged, readmemimage, creadmemimage, + writememimage, freememimage, memsetchan, loadmemimage, cloadmemimage, + unloadmemimage, memfillcolor, memarc, mempoly, memellipse, + memfillpoly, memimageline, memimagedraw, drawclip, memlinebbox, + memlineendsize, allocmemsubfont, openmemsubfont, freememsubfont, + memsubfontwidth, getmemdefont, memimagestring, iprint, hwdraw + – drawing routines for memory-resident images<br> + +</table> +<p><font size=+1><b>SYNOPSIS </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <tt><font size=+1>#include <u.h> <br> + #include <u.h> <br> + #include <libc.h> <br> + #include <draw.h> <br> + #include <memdraw.h> <br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt> + <tt><font size=+1>typedef struct Memdata<br> + {<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + ulong *base; /* allocated data pointer */<br> + uchar *bdata; /* first byte of actual data; word−aligned */<br> + int ref; /* number of Memimages using this data */<br> + void* imref; /* last image that pointed at this */<br> + int allocd; /* is this malloc'd? */<br> + + </table> + } Memdata;<br> + enum {<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + Frepl = 1<<0, /* is replicated */<br> + Fsimple = 1<<1, /* is 1x1 */<br> + Fgrey = 1<<2, /* is grey */<br> + Falpha = 1<<3, /* has explicit alpha */<br> + Fcmap = 1<<4, /* has cmap channel */<br> + Fbytes = 1<<5, /* has only 8−bit channels */<br> + + </table> + };<br> + typedef struct Memimage<br> + {<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + Rectangle r; /* rectangle in data area, local coords */<br> + Rectangle clipr; /* clipping region */<br> + int depth; /* number of bits of storage per pixel */<br> + int nchan; /* number of channels */<br> + ulong chan; /* channel descriptions */<br> + Memdata *data; /* pointer to data */<br> + int zero; /* data−>bdata+zero==&byte containing (0,0) */<br> + ulong width; /* width in words of a single scan line */<br> + Memlayer *layer; /* nil if not a layer*/<br> + ulong flags;<br> + + </table> + </font></tt> + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <i>...<br> + </i> + </table> + <tt><font size=+1>} Memimage;<br> + typedef struct Memdrawparam<br> + {<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + Memimage *dst;<br> + Rectangle r;<br> + Memimage *src;<br> + Rectangle sr;<br> + Memimage *mask;<br> + Rectangle mr;<br> + + </table> + </font></tt> + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <i>...<br> + </i> + </table> + <tt><font size=+1>} Memdrawparam;<br> + int drawdebug;<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + </font></tt><i> + </i><tt><font size=+1>void memimageinit(void)<br> + ulong* wordaddr(Memimage *i, Point p)<br> + uchar* byteaddr(Memimage *i, Point p)<br> + void memimagemove(void *from, void *to)<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + Memimage* allocmemimage(Rectangle r, ulong chan)<br> + Memimage* allocmemimaged(Rectangle r, ulong chan, Memdata *data)<br> + Memimage* readmemimage(int fd)<br> + Memimage* creadmemimage(int fd)<br> + int writememimage(int fd, Memimage *i)<br> + void freememimage(Memimage *i)<br> + int memsetchan(Memimage*, ulong)<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + int loadmemimage(Memimage *i, Rectangle r,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + uchar *buf, int nbuf)<br> + + </table> + + </table> + int cloadmemimage(Memimage *i, Rectangle r,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + uchar *buf, int nbuf)<br> + + </table> + + </table> + int unloadmemimage(Memimage *i, Rectangle r,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + uchar *buf, int nbuf)<br> + + </table> + + </table> + void memfillcolor(Memimage *i, ulong color)<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + void memarc(Memimage *dst, Point c, int a, int b, int thick,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + Memimage *src, Point sp, int alpha, int phi, Drawop op)<br> + + </table> + + </table> + void mempoly(Memimage *dst, Point *p, int np, int end0,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + int end1, int radius, Memimage *src, Point sp, Drawop op)<br> + + </table> + + </table> + void memellipse(Memimage *dst, Point c, int a, int b,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + int thick, Memimage *src, Point sp, Drawop op)<br> + + </table> + + </table> + void memfillpoly(Memimage *dst, Point *p, int np, int wind,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + Memimage *src, Point sp, Drawop op)<br> + + </table> + + </table> + void memimageline(Memimage *dst, Point p0, Point p1, int end0,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + int end1, int radius, Memimage *src, Point sp, Drawop op)<br> + + </table> + + </table> + void memimagedraw(Memimage *dst, Rectangle r, Memimage *src,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + Point sp, Memimage *mask, Point mp, Drawop op)<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + + </table> + + </table> + int drawclip(Memimage *dst, Rectangle *dr, Memimage *src,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + Point *sp, Memimage *mask, Point *mp,<br> + Rectangle *sr, Rectangle *mr)<br> + + </table> + + </table> + Rectangle memlinebbox(Point p0, Point p1, int end0, int end1,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + int radius)<br> + + </table> + + </table> + int memlineendsize(int end)<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + Memsubfont* allocmemsubfont(char *name, int n, int height,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + int ascent, Fontchar *info, Memimage *i)<br> + + </table> + + </table> + Memsubfont* openmemsubfont(char *name)<br> + void freememsubfont(Memsubfont *f)<br> + Point memsubfontwidth(Memsubfont *f, char *s)<br> + Memsubfont* getmemdefont(void)<br> + Point memimagestring(Memimage *dst, Point p, Memimage *color,<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + + <table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + Point cp, Memsubfont *f, char *cs, Drawop op)<br> + + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + + </table> + + </table> + int iprint(char *fmt, ...)<br> + int hwdraw(Memdrawparam *param)<br> + </font></tt> +</table> +<p><font size=+1><b>DESCRIPTION </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + The <tt><font size=+1>Memimage</font></tt> type defines memory-resident rectangular pictures + and the methods to draw upon them; <tt><font size=+1>Memimage</font></tt>s differ from <tt><font size=+1>Image</font></tt>s + (see <a href="../man3/draw.html"><i>draw</i>(3)</a>) in that they are manipulated directly in user memory + rather than by RPCs to the <tt><font size=+1>/dev/draw</font></tt> hierarchy. The library is + the basis for the kernel <a href="../man3/draw.html"><i>draw</i>(3)</a> driver and also + used by a number of programs that must manipulate images without + a display. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + The <tt><font size=+1>r, clipr</font></tt>, <tt><font size=+1>depth</font></tt>, <tt><font size=+1>nchan</font></tt>, and <tt><font size=+1>chan</font></tt> structure elements are identical + to the ones of the same name in the <tt><font size=+1>Image</font></tt> structure. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + The <tt><font size=+1>flags</font></tt> element of the <tt><font size=+1>Memimage</font></tt> structure holds a number of + bits of information about the image. In particular, it subsumes + the purpose of the <tt><font size=+1>repl</font></tt> element of <tt><font size=+1>Image</font></tt> structures. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Memimageinit</i> initializes various static data that the library + depends on, as well as the replicated solid color images <tt><font size=+1>memopaque</font></tt>, + <tt><font size=+1>memtransparent</font></tt>, <tt><font size=+1>memblack</font></tt>, and <tt><font size=+1>memwhite</font></tt>. It should be called before + referring to any of these images and before calling any of the + other library functions. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + Each <tt><font size=+1>Memimage</font></tt> points at a <tt><font size=+1>Memdata</font></tt> structure that in turn points + at the actual pixel data for the image. This allows multiple images + to be associated with the same <tt><font size=+1>Memdata</font></tt>. The first word of the + data pointed at by the <tt><font size=+1>base</font></tt> element of <tt><font size=+1>Memdata</font></tt> points back at + the <tt><font size=+1>Memdata</font></tt> structure, so that in the Plan 9 kernel, + the memory allocator (see Plan 9’s <i>pool</i>(3)) can compact image + memory using <i>memimagemove</i>. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + Because images can have different coordinate systems, the <tt><font size=+1>zero</font></tt> + element of the <tt><font size=+1>Memimage</font></tt> structure contains the offset that must + be added to the <tt><font size=+1>bdata</font></tt> element of the corresponding <tt><font size=+1>Memdata</font></tt> structure + in order to yield a pointer to the data for the pixel (0,0). Adding + <tt><font size=+1>width</font></tt> machine words to this pointer moves it + down one scan line. The <tt><font size=+1>depth</font></tt> element can be used to determine + how to move the pointer horizontally. Note that this method works + even for images whose rectangles do not include the origin, although + one should only dereference pointers corresponding to pixels within + the image rectangle. <i>Wordaddr</i> and + <i>byteaddr</i> perform these calculations, returning pointers to the + word and byte, respectively, that contain the beginning of the + data for a given pixel. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Allocmemimage</i> allocages images with a given rectangle and channel + descriptor (see <tt><font size=+1>strtochan</font></tt> in <a href="../man3/graphics.html"><i>graphics</i>(3)</a>), creating a fresh <tt><font size=+1>Memdata</font></tt> + structure and associated storage. <i>Allocmemimaged</i> is similar but + uses the supplied <i>Memdata</i> structure rather than a new one. The + <i>readmemimage</i> function reads an + uncompressed bitmap from the given file descriptor, while <i>creadmemimage</i> + reads a compressed bitmap. <i>Writememimage</i> writes a compressed representation + of <i>i</i> to file descriptor <i>fd</i>. For more on bitmap formats, see <a href="../man7/image.html"><i>image</i>(7)</a>. + <i>Freememimage</i> frees images returned by any of these routines. The + <tt><font size=+1>Memimage</font></tt> structure + contains some tables that are used to store precomputed values + depending on the channel descriptor. <i>Memsetchan</i> updates the <tt><font size=+1>chan</font></tt> + element of the structure as well as these tables, returning –1 + if passed a bad channel descriptor. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Loadmemimage</i> and <i>cloadmemimage</i> replace the pixel data for a given + rectangle of an image with the given buffer of uncompressed or + compressed data, respectively. When calling <i>cloadmemimage</i>, the + buffer must contain an integral number of compressed chunks of + data that exactly cover the rectangle. + <i>Unloadmemimage</i> retrieves the uncompressed pixel data for a given + rectangle of an image. All three return the number of bytes consumed + on success, and –1 in case of an error. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Memfillcolor</i> fills an image with the given color, a 32-bit number + as described in <a href="../man3/color.html"><i>color</i>(3)</a>. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Memarc</i>, <i>mempoly</i>, <i>memellipse</i>, <i>memfillpoly</i>, <i>memimageline</i>, and <i>memimagedraw</i> + are identical to the <i>arc</i>, <i>poly</i>, <i>ellipse</i>, <i>fillpoly</i>, <i>line</i>, and <i>gendraw</i>, + routines described in <a href="../man3/draw.html"><i>draw</i>(3)</a>, except that they operate on <tt><font size=+1>Memimage</font></tt>s + rather than <tt><font size=+1>Image</font></tt>s. Similarly, <i>allocmemsubfont</i>, <i>openmemsubfont</i>, + <i>freememsubfont</i>, + <i>memsubfontwidth</i>, <i>getmemdefont</i>, and <i>memimagestring</i> are the <tt><font size=+1>Memimage</font></tt> + analogues of <i>allocsubfont</i>, <i>openfont</i>, <i>freesubfont</i>, <i>strsubfontwidth</i>, + <i>getdefont</i>, and <tt><font size=+1>string</font></tt> (see <a href="../man3/subfont.html"><i>subfont</i>(3)</a> and <a href="../man3/graphics.html"><i>graphics</i>(3)</a>), except + that they operate only on <tt><font size=+1>Memsubfont</font></tt>s rather than <tt><font size=+1>Font</font></tt>s. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + <i>Drawclip</i> takes the images involved in a draw operation, together + with the destination rectangle <tt><font size=+1>dr</font></tt> and source and mask alignment + points <tt><font size=+1>sp</font></tt> and <tt><font size=+1>mp</font></tt>, and clips them according to the clipping rectangles + of the images involved. It also fills in the rectangles <tt><font size=+1>sr</font></tt> and + <tt><font size=+1>mr</font></tt> with rectangles congruent to the returned + destination rectangle but translated so the upper left corners + are the returned <tt><font size=+1>sp</font></tt> and <tt><font size=+1>mp</font></tt>. <i>Drawclip</i> returns zero when the clipped + rectangle is empty. <i>Memlinebbox</i> returns a conservative bounding + box containing a line between two points with given end styles + and radius. <i>Memlineendsize</i> calculates the extra length + added to a line by attaching an end of a given style. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + The <i>hwdraw</i> and <i>iprint</i> functions are no-op stubs that may be overridden + by clients of the library. <i>Hwdraw</i> is called at each call to <i>memimagedraw</i> + with the current request’s parameters. If it can satisfy the request, + it should do so and return 1. If it cannot satisfy the request, + it should return 0. This allows (for + instance) the kernel to take advantage of hardware acceleration. + <i>Iprint</i> should format and print its arguments; it is given much + debugging output when the global integer variable <tt><font size=+1>drawdebug</font></tt> is + non-zero. In the kernel, <i>iprint</i> prints to a serial line rather + than the screen, for obvious reasons. + +</table> +<p><font size=+1><b>SOURCE </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <tt><font size=+1>/usr/local/plan9/src/libdraw<br> + </font></tt> +</table> +<p><font size=+1><b>SEE ALSO </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <a href="../man3/addpt.html"><i>addpt</i>(3)</a>, <a href="../man3/color.html"><i>color</i>(3)</a>, <a href="../man3/draw.html"><i>draw</i>(3)</a>, <a href="../man3/graphics.html"><i>graphics</i>(3)</a>, <a href="../man3/memlayer.html"><i>memlayer</i>(3)</a>, <a href="../man3/stringsize.html"><i>stringsize</i>(3)</a>, + <a href="../man3/subfont.html"><i>subfont</i>(3)</a>, <a href="../man7/color.html"><i>color</i>(7)</a>, <a href="../man7/utf.html"><i>utf</i>(7)</a><br> + +</table> +<p><font size=+1><b>BUGS </b></font><br> + +<table border=0 cellpadding=0 cellspacing=0><tr height=2><td><tr><td width=20><td> + + <i>Memimagestring</i> is unusual in using a subfont rather than a font, + and in having no parameter to align the source. + <table border=0 cellpadding=0 cellspacing=0><tr height=5><td></table> + + These functions are archived into <i>libdraw</i>.<br> + +</table> + +<td width=20> +<tr height=20><td> +</table> +<!-- TRAILER --> +<table border=0 cellpadding=0 cellspacing=0 width=100%> +<tr height=15><td width=10><td><td width=10> +<tr><td><td> +<center> +<a href="../../"><img src="../../dist/spaceglenda100.png" alt="Space Glenda" border=1></a> +</center> +</table> +<!-- TRAILER --> +</body></html> |