71dbddef16
when a replicated source image with a clipr with clipr.min > Pt(0, 0),
drawclip() would properly translate the src->clipr on the dstr
but then clamp the source rectangle back on src->r.
while traversing down multiple layers, this would cause the translation to
be applied multiple times to the dst rectangle giving the wrong image result.
this change adds a new drawclipnorepl() function that avoids the clamping
of source and mask rectangles to src->r and mask->r. this is then used in
libmemlayer.
the final memimagedraw() call will call drawclip() which will do the final
claming.
a testcase is provided:
#include <u.h>
#include <libc.h>
#include <draw.h>
Image *blue;
Image *red;
void
main(int, char *argv[])
{
Image *i;
if(initdraw(nil, nil, argv[0]) < 0)
sysfatal("initdraw: %r");
i = allocimage(display, screen->r, screen->chan, 1, DWhite);
red = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DRed);
blue = allocimage(display, Rect(0,0,1,1), screen->chan, 1, DPaleblue);
replclipr(red, 1, Rect(10, 10, 110, 110));
replclipr(blue, 1, Rect(11, 11, 111, 111));
/* draw on non-layer, works correctly */
draw(i, i->r, red, nil, ZP);
draw(i, i->r, blue, nil, ZP);
draw(screen, screen->r, i, nil, i->r.min);
flushimage(display, 1);
/* draw on (screen) layer is too far to the right */
draw(screen, screen->r, red, nil, ZP);
draw(screen, screen->r, blue, nil, ZP);
flushimage(display, 1);
for(;;){
sleep(1000);
}
}
196 lines
5.6 KiB
C
196 lines
5.6 KiB
C
#pragma src "/sys/src/libmemdraw"
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#pragma lib "libmemdraw.a"
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typedef struct Memimage Memimage;
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typedef struct Memdata Memdata;
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typedef struct Memsubfont Memsubfont;
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typedef struct Memlayer Memlayer;
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typedef struct Memcmap Memcmap;
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typedef struct Memdrawparam Memdrawparam;
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#pragma incomplete Memlayer
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/*
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* Memdata is allocated from main pool, but .data from the image pool.
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* Memdata is allocated separately to permit patching its pointer after
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* compaction when windows share the image data.
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* The first word of data is a back pointer to the Memdata, to find
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* The word to patch.
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*/
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struct Memdata
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{
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ulong *base; /* allocated data pointer */
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uchar *bdata; /* pointer to first byte of actual data; word-aligned */
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int ref; /* number of Memimages using this data */
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void* imref;
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int allocd; /* is this malloc'd? */
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};
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enum {
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Frepl = 1<<0, /* is replicated */
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Fsimple = 1<<1, /* is 1x1 */
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Fgrey = 1<<2, /* is grey */
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Falpha = 1<<3, /* has explicit alpha */
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Fcmap = 1<<4, /* has cmap channel */
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Fbytes = 1<<5, /* has only 8-bit channels */
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};
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struct Memimage
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{
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Rectangle r; /* rectangle in data area, local coords */
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Rectangle clipr; /* clipping region */
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int depth; /* number of bits of storage per pixel */
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int nchan; /* number of channels */
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ulong chan; /* channel descriptions */
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Memcmap *cmap;
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Memdata *data; /* pointer to data; shared by windows in this image */
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int zero; /* data->bdata+zero==&byte containing (0,0) */
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ulong width; /* width in words of a single scan line */
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Memlayer *layer; /* nil if not a layer*/
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ulong flags;
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int shift[NChan];
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int mask[NChan];
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int nbits[NChan];
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};
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struct Memcmap
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{
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uchar cmap2rgb[3*256];
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uchar rgb2cmap[16*16*16];
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};
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/*
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* Subfonts
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*
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* given char c, Subfont *f, Fontchar *i, and Point p, one says
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* i = f->info+c;
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* draw(b, Rect(p.x+i->left, p.y+i->top,
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* p.x+i->left+((i+1)->x-i->x), p.y+i->bottom),
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* color, f->bits, Pt(i->x, i->top));
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* p.x += i->width;
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* to draw characters in the specified color (itself a Memimage) in Memimage b.
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*/
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struct Memsubfont
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{
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char *name;
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short n; /* number of chars in font */
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uchar height; /* height of bitmap */
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char ascent; /* top of bitmap to baseline */
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Fontchar *info; /* n+1 character descriptors */
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Memimage *bits; /* of font */
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};
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/*
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* Encapsulated parameters and information for sub-draw routines.
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*/
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enum {
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Simplesrc=1<<0,
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Simplemask=1<<1,
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Replsrc=1<<2,
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Replmask=1<<3,
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Fullmask=1<<4,
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};
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struct Memdrawparam
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{
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Memimage *dst;
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Rectangle r;
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Memimage *src;
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Rectangle sr;
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Memimage *mask;
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Rectangle mr;
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int op;
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ulong state;
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ulong mval; /* if Simplemask, the mask pixel in mask format */
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ulong mrgba; /* mval in rgba */
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ulong sval; /* if Simplesrc, the source pixel in src format */
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ulong srgba; /* sval in rgba */
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ulong sdval; /* sval in dst format */
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};
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/*
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* Memimage management
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*/
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extern Memimage* allocmemimage(Rectangle, ulong);
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extern Memimage* allocmemimaged(Rectangle, ulong, Memdata*);
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extern Memimage* readmemimage(int);
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extern Memimage* creadmemimage(int);
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extern int writememimage(int, Memimage*);
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extern void freememimage(Memimage*);
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extern int loadmemimage(Memimage*, Rectangle, uchar*, int);
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extern int cloadmemimage(Memimage*, Rectangle, uchar*, int);
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extern int unloadmemimage(Memimage*, Rectangle, uchar*, int);
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extern ulong* wordaddr(Memimage*, Point);
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extern uchar* byteaddr(Memimage*, Point);
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extern int drawclipnorepl(Memimage*, Rectangle*, Memimage*, Point*, Memimage*, Point*, Rectangle*, Rectangle*);
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extern int drawclip(Memimage*, Rectangle*, Memimage*, Point*, Memimage*, Point*, Rectangle*, Rectangle*);
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extern void memfillcolor(Memimage*, ulong);
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extern int memsetchan(Memimage*, ulong);
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/*
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* Graphics
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*/
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extern void memdraw(Memimage*, Rectangle, Memimage*, Point, Memimage*, Point, int);
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extern void memline(Memimage*, Point, Point, int, int, int, Memimage*, Point, int);
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extern void mempoly(Memimage*, Point*, int, int, int, int, Memimage*, Point, int);
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extern void memfillpoly(Memimage*, Point*, int, int, Memimage*, Point, int);
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extern void _memfillpolysc(Memimage*, Point*, int, int, Memimage*, Point, int, int, int, int);
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extern void memimagedraw(Memimage*, Rectangle, Memimage*, Point, Memimage*, Point, int);
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extern int hwdraw(Memdrawparam*);
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extern void memimageline(Memimage*, Point, Point, int, int, int, Memimage*, Point, int);
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extern void _memimageline(Memimage*, Point, Point, int, int, int, Memimage*, Point, Rectangle, int);
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extern Point memimagestring(Memimage*, Point, Memimage*, Point, Memsubfont*, char*);
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extern void memellipse(Memimage*, Point, int, int, int, Memimage*, Point, int);
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extern void memarc(Memimage*, Point, int, int, int, Memimage*, Point, int, int, int);
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extern Rectangle memlinebbox(Point, Point, int, int, int);
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extern int memlineendsize(int);
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extern void _memmkcmap(void);
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extern int memimageinit(void);
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/*
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* Subfont management
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*/
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extern Memsubfont* allocmemsubfont(char*, int, int, int, Fontchar*, Memimage*);
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extern Memsubfont* openmemsubfont(char*);
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extern void freememsubfont(Memsubfont*);
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extern Point memsubfontwidth(Memsubfont*, char*);
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extern Memsubfont* getmemdefont(void);
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/*
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* Predefined
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*/
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extern Memimage* memwhite;
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extern Memimage* memblack;
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extern Memimage* memopaque;
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extern Memimage* memtransparent;
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extern Memcmap *memdefcmap;
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/*
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* Kernel interface
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*/
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void memimagemove(void*, void*);
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/*
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* Kernel cruft
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*/
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extern void rdb(void);
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extern int iprint(char*, ...);
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#pragma varargck argpos iprint 1
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extern int drawdebug;
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/*
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* doprint interface: numbconv bit strings
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*/
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#pragma varargck type "llb" vlong
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#pragma varargck type "llb" uvlong
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#pragma varargck type "lb" long
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#pragma varargck type "lb" ulong
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#pragma varargck type "b" int
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#pragma varargck type "b" uint
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