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netsurf/framebuffer/fb_plotters.c
Vincent Sanders 8db32fc061 add vertical scrollbar to freamebuffer 
svn path=/trunk/netsurf/; revision=6817
2009-03-22 14:34:56 +00:00

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/*
* Copyright 2008 Vincent Sanders <vince@simtec.co.uk>
* Copyright 2009 Michael Drake <tlsa@netsurf-browser.org>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <sys/types.h>
#include <stdint.h>
#include <string.h>
#include <limits.h>
#include "utils/log.h"
#include "utils/utf8.h"
#include "desktop/browser.h"
#include "desktop/plotters.h"
#include "framebuffer/fb_gui.h"
#include "framebuffer/fb_tk.h"
#include "framebuffer/fb_plotters.h"
#include "framebuffer/fb_bitmap.h"
#include "framebuffer/fb_font.h"
#include "framebuffer/fb_frontend.h"
extern fbtk_widget_t *fbtk;
/* max height the poly plotter can cope with */
#define WINDOW_HEIGHT (2048)
/* Currently selected ploting routines. */
struct plotter_table plot;
/* Current plotting context */
bbox_t fb_plot_ctx;
enum {
POINT_LEFTOF_REGION = 1,
POINT_RIGHTOF_REGION = 2,
POINT_ABOVE_REGION = 4,
POINT_BELOW_REGION = 8,
};
#define REGION(x,y,cx1,cx2,cy1,cy2) ( ( (y) > (cy2) ? POINT_BELOW_REGION : 0) | \
( (y) < (cy1) ? POINT_ABOVE_REGION : 0) | \
( (x) > (cx2) ? POINT_RIGHTOF_REGION : 0) | \
( (x) < (cx1) ? POINT_LEFTOF_REGION : 0) )
#define SWAP(a, b) do { int t; t=(a); (a)=(b); (b)=t; } while(0)
/* clip a rectangle to another rectangle */
bool fb_plotters_clip_rect(const bbox_t * restrict clip,
int * restrict x0, int * restrict y0,
int * restrict x1, int * restrict y1)
{
char region1;
char region2;
if (*x1 < *x0) SWAP(*x0, *x1);
if (*y1 < *y0) SWAP(*y0, *y1);
region1 = REGION(*x0, *y0, clip->x0, clip->x1 - 1, clip->y0, clip->y1 - 1);
region2 = REGION(*x1, *y1, clip->x0, clip->x1 - 1, clip->y0, clip->y1 - 1);
/* area lies entirely outside the clipping rectangle */
if ((region1 | region2) && (region1 & region2))
return false;
if (*x0 < clip->x0)
*x0 = clip->x0;
if (*x0 > clip->x1)
*x0 = clip->x1;
if (*x1 < clip->x0)
*x1 = clip->x0;
if (*x1 > clip->x1)
*x1 = clip->x1;
if (*y0 < clip->y0)
*y0 = clip->y0;
if (*y0 > clip->y1)
*y0 = clip->y1;
if (*y1 < clip->y0)
*y1 = clip->y0;
if (*y1 > clip->y1)
*y1 = clip->y1;
return true;
}
bool fb_plotters_clip_rect_ctx(int *x0, int *y0, int *x1, int *y1)
{
return fb_plotters_clip_rect(&fb_plot_ctx, x0, y0, x1, y1);
}
/** Clip a line to a bounding box.
*/
bool fb_plotters_clip_line(const bbox_t *clip,
int *x0, int *y0, int *x1, int *y1)
{
char region1;
char region2;
region1 = REGION(*x0, *y0, clip->x0, clip->x1 - 1, clip->y0, clip->y1 - 1);
region2 = REGION(*x1, *y1, clip->x0, clip->x1 - 1, clip->y0, clip->y1 - 1);
while (region1 | region2) {
if (region1 & region2) {
/* line lies entirely outside the clipping rectangle */
return false;
}
if (region1) {
/* first point */
if (region1 & POINT_BELOW_REGION) {
/* divide line at bottom */
*x0 = (*x0 + (*x1 - *x0) *
(clip->y1 - 1 - *y0) / (*y1-*y0));
*y0 = clip->y1 - 1;
} else if (region1 & POINT_ABOVE_REGION) {
/* divide line at top */
*x0 = (*x0 + (*x1 - *x0) *
(clip->y0 - *y0) / (*y1-*y0));
*y0 = clip->y0;
} else if (region1 & POINT_RIGHTOF_REGION) {
/* divide line at right */
*y0 = (*y0 + (*y1 - *y0) *
(clip->x1 - 1 - *x0) / (*x1-*x0));
*x0 = clip->x1 - 1;
} else if (region1 & POINT_LEFTOF_REGION) {
/* divide line at right */
*y0 = (*y0 + (*y1 - *y0) *
(clip->x0 - *x0) / (*x1-*x0));
*x0 = clip->x0;
}
region1 = REGION(*x0, *y0,
clip->x0, clip->x1 - 1, clip->y0, clip->y1 - 1);
} else {
/* second point */
if (region2 & POINT_BELOW_REGION) {
/* divide line at bottom*/
*x1 = (*x0 + (*x1 - *x0) *
(clip->y1 - 1 - *y0) / (*y1-*y0));
*y1 = clip->y1 - 1;
} else if (region2 & POINT_ABOVE_REGION) {
/* divide line at top*/
*x1 = (*x0 + (*x1 - *x0) *
(clip->y0 - *y0) / (*y1-*y0));
*y1 = clip->y0;
} else if (region2 & POINT_RIGHTOF_REGION) {
/* divide line at right*/
*y1 = (*y0 + (*y1 - *y0) *
(clip->x1 - 1 - *x0) / (*x1 - *x0));
*x1 = clip->x1 - 1;
} else if (region2 & POINT_LEFTOF_REGION) {
/* divide line at right*/
*y1 = (*y0 + (*y1 - *y0) *
(clip->x0 - *x0) / (*x1 - *x0));
*x1 = clip->x0;
}
region2 = REGION(*x1, *y1,
clip->x0, clip->x1 - 1, clip->y0, clip->y1 - 1);
}
}
return true;
}
bool fb_plotters_clip_line_ctx(int *x0, int *y0, int *x1, int *y1)
{
return fb_plotters_clip_line(&fb_plot_ctx, x0, y0, x1, y1);
}
/* generic setting of clipping rectangle */
bool fb_clip(int x0, int y0, int x1, int y1)
{
bbox_t clip;
if (x1 < x0) SWAP(x0, x1);
if (y1 < y0) SWAP(y0, y1);
clip.x0 = fbtk_get_x(fbtk);
clip.y0 = fbtk_get_y(fbtk);
clip.x1 = fbtk_get_width(fbtk);
clip.y1 = fbtk_get_height(fbtk);
if (fb_plotters_clip_rect(&clip, &x0, &y0, &x1, &y1)) {
/* new clipping region is inside the root window */
fb_plot_ctx.x0 = x0;
fb_plot_ctx.y0 = y0;
fb_plot_ctx.x1 = x1;
fb_plot_ctx.y1 = y1;
}
/*LOG(("%d, %d - %d, %d clipped to %d, %d - %d, %d",
x0,y0,x1,y1,
fb_plot_ctx.x0, fb_plot_ctx.y0, fb_plot_ctx.x1, fb_plot_ctx.y1)); */
return true;
}
typedef bool (linefn_t)(int x0, int y0, int x1, int y1, int width, colour c,
bool dotted, bool dashed);
/**
* Find find first filled span along horizontal line at given coordinate
*
* \param p array of polygon vertices (x1, y1, x2, y2, ... , xN, yN)
* \param n number of polygon vertex values (N * 2)
* \param x current position along current scan line
* \param y position of current scan line
* \param x0 updated to start of filled area
* \param x1 updated to end of filled area
* \return true if an intersection was found
*/
static bool fb_plotters_find_span(const int *p, int n, int x, int y,
int *x0, int *x1)
{
int i;
int p_x0, p_y0;
int p_x1, p_y1;
int x_new;
bool direction = false;
*x0 = *x1 = INT_MAX;
for (i = 0; i < n; i = i + 2) {
/* get line endpoints */
if (i != n - 2) {
/* not the last line */
p_x0 = p[i]; p_y0 = p[i + 1];
p_x1 = p[i + 2]; p_y1 = p[i + 3];
} else {
/* last line; 2nd endpoint is first vertex */
p_x0 = p[i]; p_y0 = p[i + 1];
p_x1 = p[0]; p_y1 = p[1];
}
/* ignore horizontal lines */
if (p_y0 == p_y1)
continue;
/* ignore lines that don't cross this y level */
if ((y < p_y0 && y < p_y1) || (y > p_y0 && y > p_y1))
continue;
if (p_x0 == p_x1) {
/* vertical line, x is constant */
x_new = p_x0;
} else {
/* find intersect */
x_new = p_x0 + ((long long)(y - p_y0) * (p_x1 - p_x0)) /
(p_y1 - p_y0);
}
/* ignore intersections before current x */
if (x_new < x)
continue;
/* set nearest intersections as filled area endpoints */
if (x_new < *x0) {
/* nearer than first endpoint */
*x1 = *x0;
*x0 = x_new;
direction = (p_y0 > p_y1);
} else if (x_new == *x0) {
/* same as first endpoint */
if ((p_y0 > p_y1) != direction)
*x1 = x_new;
} else if (x_new < *x1) {
/* nearer than second endpoint */
*x1 = x_new;
}
}
if (*x0 == INT_MAX)
/* no span found */
return false;
/* span found */
if (*x1 == INT_MAX) {
*x1 = *x0;
*x0 = x;
return true;
}
return true;
}
/**
* Plot a polygon
*
* \param p array of polygon vertices (x1, y1, x2, y2, ... , xN, yN)
* \param n number of polygon vertices (N)
* \param c fill colour
* \param linefn function to call to plot a horizontal line
* \return true if no errors
*/
bool fb_plotters_polygon(const int *p, unsigned int n, colour c,
linefn_t linefn)
{
int poly_x0, poly_y0; /* Bounding box top left corner */
int poly_x1, poly_y1; /* Bounding box bottom right corner */
int i, j; /* indexes */
int x0, x1; /* filled span extents */
int y; /* current y coordinate */
int y_max; /* bottom of plot area */
/* find no. of vertex values */
int v = n * 2;
/* Can't plot polygons with 2 or fewer vertices */
if (n <= 2)
return true;
/* Find polygon bounding box */
poly_x0 = poly_x1 = *p;
poly_y0 = poly_y1 = p[1];
for (i = 2; i < v; i = i + 2) {
j = i + 1;
if (p[i] < poly_x0)
poly_x0 = p[i];
else if (p[i] > poly_x1)
poly_x1 = p[i];
if (p[j] < poly_y0)
poly_y0 = p[j];
else if (p[j] > poly_y1)
poly_y1 = p[j];
}
/* Don't try to plot it if it's outside the clip rectangle */
if (fb_plot_ctx.y1 < poly_y0 || fb_plot_ctx.y0 > poly_y1 ||
fb_plot_ctx.x1 < poly_x0 || fb_plot_ctx.x0 > poly_x1)
return true;
/* Find the top of the important area */
if (poly_y0 > fb_plot_ctx.y0)
y = poly_y0;
else
y = fb_plot_ctx.y0;
/* Find the bottom of the important area */
if (poly_y1 < fb_plot_ctx.y1)
y_max = poly_y1;
else
y_max = fb_plot_ctx.y1;
for (; y < y_max; y++) {
x1 = poly_x0;
/* For each row */
while (fb_plotters_find_span(p, v, x1, y, &x0, &x1)) {
/* don't draw anything outside clip region */
if (x1 < fb_plot_ctx.x0)
continue;
else if (x0 < fb_plot_ctx.x0)
x0 = fb_plot_ctx.x0;
if (x0 > fb_plot_ctx.x1)
break;
else if (x1 > fb_plot_ctx.x1)
x1 = fb_plot_ctx.x1;
/* draw this filled span on current row */
linefn(x0, y, x1, y, 1, c, false, false);
/* don't look for more spans if already at end of clip
* region or polygon */
if (x1 == fb_plot_ctx.x1 || x1 == poly_x1)
break;
if (x0 == x1)
x1++;
}
}
return true;
}
bool fb_plotters_bitmap_tile(int x, int y,
int width, int height,
struct bitmap *bitmap, colour bg,
bool repeat_x, bool repeat_y,
struct content *content,
bool (bitmapfn)(int x, int y,
int width, int height,
struct bitmap *bitmap,
colour bg,
struct content *content))
{
int xf,yf;
/* x and y define coordinate of top left of of the initial explicitly
* placed tile. The width and height are the image scaling and the
* bounding box defines the extent of the repeat (which may go in all
* four directions from the initial tile).
*/
LOG(("x %d, y %d, width %d, height %d, bitmap %p, repx %d repy %d content %p", x,y,width,height,bitmap,repeat_x, repeat_y, content));
if (!(repeat_x || repeat_y)) {
/* Not repeating at all, so just pass it on */
LOG(("Not repeating"));
return bitmapfn(x, y, width, height, bitmap, bg,content);
}
/* get left most tile position */
if (repeat_x)
for (; x > fb_plot_ctx.x0; x -= width)
;
/* get top most tile position */
if (repeat_y)
for (; y > fb_plot_ctx.y0; y -= height)
;
/* tile down and across to extents */
for (xf = x; xf < fb_plot_ctx.x1; xf += width) {
for (yf = y; yf < fb_plot_ctx.y1; yf += height) {
bitmapfn(xf, yf, width, height, bitmap, bg, content);
if (!repeat_y)
break;
}
if (!repeat_x)
break;
}
return true;
}
bool fb_plotters_move_block(int srcx, int srcy, int width, int height, int dstx, int dsty)
{
uint8_t *srcptr = (framebuffer->ptr +
(srcy * framebuffer->linelen) +
((srcx * framebuffer->bpp) / 8));
uint8_t *dstptr = (framebuffer->ptr +
(dsty * framebuffer->linelen) +
((dstx * framebuffer->bpp) / 8));
bbox_t redrawbox;
int hloop;
LOG(("from (%d,%d) w %d h %d to (%d,%d)",srcx,srcy,width,height,dstx,dsty));
if (width == framebuffer->width) {
/* take shortcut and use memmove */
memmove(dstptr, srcptr, (width * height * framebuffer->bpp) / 8);
} else {
if (srcy > dsty) {
for (hloop = height; hloop > 0; hloop--) {
memmove(dstptr, srcptr, (width * framebuffer->bpp) / 8);
srcptr += framebuffer->linelen;
dstptr += framebuffer->linelen;
}
} else {
srcptr += height * framebuffer->linelen;
dstptr += height * framebuffer->linelen;
for (hloop = height; hloop > 0; hloop--) {
srcptr -= framebuffer->linelen;
dstptr -= framebuffer->linelen;
memmove(dstptr, srcptr, (width * framebuffer->bpp) / 8);
}
}
}
/* callback to the os specific routine in case it needs to do something
* explicit to redraw
*/
redrawbox.x0 = dstx;
redrawbox.y0 = dsty;
redrawbox.x1 = dstx + width;
redrawbox.y1 = dsty + height;
fb_os_redraw(&redrawbox);
return true;
}
/*
* Local Variables:
* c-basic-offset:8
* End:
*/
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