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netsurf/riscos/plotters.c
John Tytgat 5685170036 Make the knockout plotter calling behaviour optional by added a new entry 
'option_knockout' to 'struct plotter_table' which basically is a request
from that plotter backend for the content redraw routine to get called in
such a way that overlapping render areas are avoided as much as possible.

It is up to the content redraw code to actually implement this
option if it is reasonably profitable.  This was and is currently done
explicitly by the html content redraw code.  On top of that the riscos
plotter code was installing the knockout plotter itself for all content
types except plaintext and SVG and this is no longer being done in this
patch.

In more detail:

- desktop/plotters.h: added struct plotter_table::option_knockout
- render/html_redraw.c(html_redraw): if the plotter backend wants the
knockout calling behaviour, install the knockout plotter which will then
call the real backend.  Also check on the return values of clg and clip
plotter calls.
- Plotter backend changes:
  -> no longer plotting in knockout mode:
     - gtk/gtk_print.c: Also removed a 2nd instance of
       "struct plotter_table plot".
     - riscos/save_draw.c
     - riscos/print.c: Also the path plotter function pointer wasn't
       filled in and this is now fixed.
     - pdf/pdf_plotters.c: Removed the flush function as this is
       optional and we only had a dummy implementation there.
  -> remaining to request knockout mode if it makes sense based on the
     content type:
     - gtk/gtk_plotters.c
     - riscos/plotters.c
     - desktop/knockout.c
- riscos/window.c: Removed what's believed an obsolete test on the
  content type which determined to additionally install the
  knockout plotter in front of the real plotter code.

svn path=/trunk/netsurf/; revision=4823
2008-07-30 19:17:27 +00:00

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/*
* Copyright 2004 James Bursa <bursa@users.sourceforge.net>
*
* 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/>.
*/
/** \file
* Target independent plotting (RISC OS screen implementation).
*/
#include <stdbool.h>
#include <math.h>
#include "oslib/colourtrans.h"
#include "oslib/draw.h"
#include "oslib/os.h"
#include "desktop/plotters.h"
#include "render/font.h"
#include "riscos/bitmap.h"
#include "riscos/image.h"
#include "riscos/gui.h"
#include "riscos/oslib_pre7.h"
#include "utils/log.h"
static bool ro_plot_clg(colour c);
static bool ro_plot_rectangle(int x0, int y0, int width, int height,
int line_width, colour c, bool dotted, bool dashed);
static bool ro_plot_line(int x0, int y0, int x1, int y1, int width,
colour c, bool dotted, bool dashed);
static bool ro_plot_draw_path(const draw_path * const path, int width,
colour c, bool dotted, bool dashed);
static bool ro_plot_polygon(int *p, unsigned int n, colour fill);
static bool ro_plot_path(float *p, unsigned int n, colour fill, float width,
colour c, float *transform);
static bool ro_plot_fill(int x0, int y0, int x1, int y1, colour c);
static bool ro_plot_clip(int clip_x0, int clip_y0,
int clip_x1, int clip_y1);
static bool ro_plot_text(int x, int y, const struct css_style *style,
const char *text, size_t length, colour bg, colour c);
static bool ro_plot_disc(int x, int y, int radius, colour colour, bool filled);
static bool ro_plot_arc(int x, int y, int radius, int angle1, int angle2,
colour c);
static bool ro_plot_bitmap(int x, int y, int width, int height,
struct bitmap *bitmap, colour bg, struct content *content);
static bool ro_plot_bitmap_tile(int x, int y, int width, int height,
struct bitmap *bitmap, colour bg,
bool repeat_x, bool repeat_y, struct content *content);
struct plotter_table plot;
const struct plotter_table ro_plotters = {
ro_plot_clg,
ro_plot_rectangle,
ro_plot_line,
ro_plot_polygon,
ro_plot_fill,
ro_plot_clip,
ro_plot_text,
ro_plot_disc,
ro_plot_arc,
ro_plot_bitmap,
ro_plot_bitmap_tile,
NULL,
NULL,
NULL,
ro_plot_path,
true
};
int ro_plot_origin_x = 0;
int ro_plot_origin_y = 0;
float ro_plot_scale = 1.0;
/** One version of the A9home OS is incapable of drawing patterned lines */
bool ro_plot_patterned_lines = true;
bool ro_plot_clg(colour c)
{
os_error *error;
error = xcolourtrans_set_gcol(c << 8,
colourtrans_SET_BG_GCOL | colourtrans_USE_ECFS_GCOL,
os_ACTION_OVERWRITE, 0, 0);
if (error) {
LOG(("xcolourtrans_set_gcol: 0x%x: %s",
error->errnum, error->errmess));
return false;
}
error = xos_clg();
if (error) {
LOG(("xos_clg: 0x%x: %s", error->errnum, error->errmess));
return false;
}
return true;
}
bool ro_plot_rectangle(int x0, int y0, int width, int height,
int line_width, colour c, bool dotted, bool dashed)
{
const int path[] = { draw_MOVE_TO,
(ro_plot_origin_x + x0 * 2) * 256,
(ro_plot_origin_y - y0 * 2 - 1) * 256,
draw_LINE_TO,
(ro_plot_origin_x + (x0 + width) * 2) * 256,
(ro_plot_origin_y - y0 * 2 - 1) * 256,
draw_LINE_TO,
(ro_plot_origin_x + (x0 + width) * 2) * 256,
(ro_plot_origin_y - (y0 + height) * 2 - 1) * 256,
draw_LINE_TO,
(ro_plot_origin_x + x0 * 2) * 256,
(ro_plot_origin_y - (y0 + height) * 2 - 1) * 256,
draw_CLOSE_LINE,
(ro_plot_origin_x + x0 * 2) * 256,
(ro_plot_origin_y - y0 * 2 - 1) * 256,
draw_END_PATH };
return ro_plot_draw_path((const draw_path *) path, line_width, c,
dotted, dashed);
}
bool ro_plot_line(int x0, int y0, int x1, int y1, int width,
colour c, bool dotted, bool dashed)
{
const int path[] = { draw_MOVE_TO,
(ro_plot_origin_x + x0 * 2) * 256,
(ro_plot_origin_y - y0 * 2 - 1) * 256,
draw_LINE_TO,
(ro_plot_origin_x + x1 * 2) * 256,
(ro_plot_origin_y - y1 * 2 - 1) * 256,
draw_END_PATH };
return ro_plot_draw_path((const draw_path *) path, width, c, dotted, dashed);
}
bool ro_plot_draw_path(const draw_path * const path, int width,
colour c, bool dotted, bool dashed)
{
static const draw_line_style line_style = { draw_JOIN_MITRED,
draw_CAP_BUTT, draw_CAP_BUTT, 0, 0x7fffffff,
0, 0, 0, 0 };
draw_dash_pattern dash = { 0, 1, { 512 } };
const draw_dash_pattern *dash_pattern = 0;
os_error *error;
if (width < 1)
width = 1;
if (ro_plot_patterned_lines) {
if (dotted) {
dash.elements[0] = 512 * width;
dash_pattern = &dash;
} else if (dashed) {
dash.elements[0] = 1536 * width;
dash_pattern = &dash;
}
}
error = xcolourtrans_set_gcol(c << 8, 0, os_ACTION_OVERWRITE, 0, 0);
if (error) {
LOG(("xcolourtrans_set_gcol: 0x%x: %s",
error->errnum, error->errmess));
return false;
}
error = xdraw_stroke(path, 0, 0, 0, width * 2 * 256,
&line_style, dash_pattern);
if (error) {
LOG(("xdraw_stroke: 0x%x: %s",
error->errnum, error->errmess));
return false;
}
return true;
}
bool ro_plot_polygon(int *p, unsigned int n, colour fill)
{
int path[n * 3 + 2];
unsigned int i;
os_error *error;
for (i = 0; i != n; i++) {
path[i * 3 + 0] = draw_LINE_TO;
path[i * 3 + 1] = (ro_plot_origin_x + p[i * 2 + 0] * 2) * 256;
path[i * 3 + 2] = (ro_plot_origin_y - p[i * 2 + 1] * 2) * 256;
}
path[0] = draw_MOVE_TO;
path[n * 3] = draw_END_PATH;
path[n * 3 + 1] = 0;
error = xcolourtrans_set_gcol(fill << 8, 0, os_ACTION_OVERWRITE, 0, 0);
if (error) {
LOG(("xcolourtrans_set_gcol: 0x%x: %s",
error->errnum, error->errmess));
return false;
}
error = xdraw_fill((draw_path *) path, 0, 0, 0);
if (error) {
LOG(("xdraw_fill: 0x%x: %s",
error->errnum, error->errmess));
return false;
}
return true;
}
bool ro_plot_path(float *p, unsigned int n, colour fill, float width,
colour c, float *transform)
{
static const draw_line_style line_style = { draw_JOIN_MITRED,
draw_CAP_BUTT, draw_CAP_BUTT, 0, 0x7fffffff,
0, 0, 0, 0 };
int *path = 0;
unsigned int i;
os_trfm trfm;
os_error *error;
if (n == 0)
return true;
if (p[0] != PLOTTER_PATH_MOVE) {
LOG(("path doesn't start with a move"));
goto error;
}
path = malloc(sizeof *path * (n + 10));
if (!path) {
LOG(("out of memory"));
goto error;
}
for (i = 0; i < n; ) {
if (p[i] == PLOTTER_PATH_MOVE) {
path[i] = draw_MOVE_TO;
path[i + 1] = p[i + 1] * 2 * 256;
path[i + 2] = -p[i + 2] * 2 * 256;
i += 3;
} else if (p[i] == PLOTTER_PATH_CLOSE) {
path[i] = draw_CLOSE_LINE;
i++;
} else if (p[i] == PLOTTER_PATH_LINE) {
path[i] = draw_LINE_TO;
path[i + 1] = p[i + 1] * 2 * 256;
path[i + 2] = -p[i + 2] * 2 * 256;
i += 3;
} else if (p[i] == PLOTTER_PATH_BEZIER) {
path[i] = draw_BEZIER_TO;
path[i + 1] = p[i + 1] * 2 * 256;
path[i + 2] = -p[i + 2] * 2 * 256;
path[i + 3] = p[i + 3] * 2 * 256;
path[i + 4] = -p[i + 4] * 2 * 256;
path[i + 5] = p[i + 5] * 2 * 256;
path[i + 6] = -p[i + 6] * 2 * 256;
i += 7;
} else {
LOG(("bad path command %f", p[i]));
goto error;
}
}
path[i] = draw_END_PATH;
path[i + 1] = 0;
trfm.entries[0][0] = transform[0] * 0x10000;
trfm.entries[0][1] = transform[1] * 0x10000;
trfm.entries[1][0] = transform[2] * 0x10000;
trfm.entries[1][1] = transform[3] * 0x10000;
trfm.entries[2][0] = (ro_plot_origin_x + transform[4] * 2) * 256;
trfm.entries[2][1] = (ro_plot_origin_y - transform[5] * 2) * 256;
if (fill != TRANSPARENT) {
error = xcolourtrans_set_gcol(fill << 8, 0,
os_ACTION_OVERWRITE, 0, 0);
if (error) {
LOG(("xcolourtrans_set_gcol: 0x%x: %s",
error->errnum, error->errmess));
goto error;
}
error = xdraw_fill((draw_path *) path, 0, &trfm, 0);
if (error) {
LOG(("xdraw_stroke: 0x%x: %s",
error->errnum, error->errmess));
goto error;
}
}
if (c != TRANSPARENT) {
error = xcolourtrans_set_gcol(c << 8, 0,
os_ACTION_OVERWRITE, 0, 0);
if (error) {
LOG(("xcolourtrans_set_gcol: 0x%x: %s",
error->errnum, error->errmess));
goto error;
}
error = xdraw_stroke((draw_path *) path, 0, &trfm, 0,
width * 2 * 256, &line_style, 0);
if (error) {
LOG(("xdraw_stroke: 0x%x: %s",
error->errnum, error->errmess));
goto error;
}
}
return true;
error:
free(path);
return false;
}
bool ro_plot_fill(int x0, int y0, int x1, int y1, colour c)
{
os_error *error;
error = xcolourtrans_set_gcol(c << 8, colourtrans_USE_ECFS_GCOL,
os_ACTION_OVERWRITE, 0, 0);
if (error) {
LOG(("xcolourtrans_set_gcol: 0x%x: %s",
error->errnum, error->errmess));
return false;
}
error = xos_plot(os_MOVE_TO,
ro_plot_origin_x + x0 * 2,
ro_plot_origin_y - y0 * 2 - 1);
if (error) {
LOG(("xos_plot: 0x%x: %s", error->errnum, error->errmess));
return false;
}
error = xos_plot(os_PLOT_RECTANGLE | os_PLOT_TO,
ro_plot_origin_x + x1 * 2 - 1,
ro_plot_origin_y - y1 * 2);
if (error) {
LOG(("xos_plot: 0x%x: %s", error->errnum, error->errmess));
return false;
}
return true;
}
bool ro_plot_clip(int clip_x0, int clip_y0,
int clip_x1, int clip_y1)
{
os_error *error;
char buf[12];
clip_x0 = ro_plot_origin_x + clip_x0 * 2;
clip_y0 = ro_plot_origin_y - clip_y0 * 2 - 1;
clip_x1 = ro_plot_origin_x + clip_x1 * 2 - 1;
clip_y1 = ro_plot_origin_y - clip_y1 * 2;
if (clip_x1 < clip_x0 || clip_y0 < clip_y1) {
LOG(("bad clip rectangle %i %i %i %i",
clip_x0, clip_y0, clip_x1, clip_y1));
return false;
}
buf[0] = os_VDU_SET_GRAPHICS_WINDOW;
buf[1] = clip_x0;
buf[2] = clip_x0 >> 8;
buf[3] = clip_y1;
buf[4] = clip_y1 >> 8;
buf[5] = clip_x1;
buf[6] = clip_x1 >> 8;
buf[7] = clip_y0;
buf[8] = clip_y0 >> 8;
error = xos_writen(buf, 9);
if (error) {
LOG(("xos_writen: 0x%x: %s", error->errnum, error->errmess));
return false;
}
return true;
}
bool ro_plot_text(int x, int y, const struct css_style *style,
const char *text, size_t length, colour bg, colour c)
{
os_error *error;
error = xcolourtrans_set_font_colours(font_CURRENT,
bg << 8, c << 8, 14, 0, 0, 0);
if (error) {
LOG(("xcolourtrans_set_font_colours: 0x%x: %s",
error->errnum, error->errmess));
return false;
}
return nsfont_paint(style, text, length,
ro_plot_origin_x + x * 2,
ro_plot_origin_y - y * 2,
ro_plot_scale);
}
bool ro_plot_disc(int x, int y, int radius, colour colour, bool filled)
{
os_error *error;
error = xcolourtrans_set_gcol(colour << 8, 0,
os_ACTION_OVERWRITE, 0, 0);
if (error) {
LOG(("xcolourtrans_set_gcol: 0x%x: %s",
error->errnum, error->errmess));
return false;
}
error = xos_plot(os_MOVE_TO,
ro_plot_origin_x + x * 2,
ro_plot_origin_y - y * 2);
if (error) {
LOG(("xos_plot: 0x%x: %s", error->errnum, error->errmess));
return false;
}
if (filled) {
error = xos_plot(os_PLOT_CIRCLE | os_PLOT_BY, radius * 2, 0);
} else {
error = xos_plot(os_PLOT_CIRCLE_OUTLINE | os_PLOT_BY,
radius * 2, 0);
}
if (error) {
LOG(("xos_plot: 0x%x: %s", error->errnum, error->errmess));
return false;
}
return true;
}
bool ro_plot_arc(int x, int y, int radius, int angle1, int angle2, colour c)
{
os_error *error;
int sx, sy, ex, ey;
double t;
x = ro_plot_origin_x + x * 2;
y = ro_plot_origin_y - y * 2;
radius <<= 1;
error = xcolourtrans_set_gcol(c << 8, 0,
os_ACTION_OVERWRITE, 0, 0);
if (error) {
LOG(("xcolourtrans_set_gcol: 0x%x: %s",
error->errnum, error->errmess));
return false;
}
t = ((double)angle1 * M_PI) / 180.0;
sx = (x + (int)(radius * cos(t)));
sy = (y + (int)(radius * sin(t)));
t = ((double)angle2 * M_PI) / 180.0;
ex = (x + (int)(radius * cos(t)));
ey = (y + (int)(radius * sin(t)));
error = xos_plot(os_MOVE_TO, x, y); /* move to centre */
if (error) {
LOG(("xos_plot: 0x%x: %s", error->errnum, error->errmess));
return false;
}
error = xos_plot(os_MOVE_TO, sx, sy); /* move to start */
if (error) {
LOG(("xos_plot: 0x%x: %s", error->errnum, error->errmess));
return false;
}
error = xos_plot(os_PLOT_ARC | os_PLOT_TO, ex, ey); /* arc to end */
if (error) {
LOG(("xos_plot: 0x%x: %s", error->errnum, error->errmess));
return false;
}
return true;
}
bool ro_plot_bitmap(int x, int y, int width, int height,
struct bitmap *bitmap, colour bg, struct content *content)
{
char *buffer;
buffer = bitmap_get_buffer(bitmap);
if (!buffer) {
LOG(("bitmap_get_buffer failed"));
return false;
}
return image_redraw(bitmap->sprite_area,
ro_plot_origin_x + x * 2,
ro_plot_origin_y - y * 2,
width, height,
bitmap->width,
bitmap->height,
bg,
false, false, false,
bitmap_get_opaque(bitmap) ? IMAGE_PLOT_TINCT_OPAQUE :
IMAGE_PLOT_TINCT_ALPHA);
}
bool ro_plot_bitmap_tile(int x, int y, int width, int height,
struct bitmap *bitmap, colour bg,
bool repeat_x, bool repeat_y, struct content *content)
{
char *buffer;
buffer = bitmap_get_buffer(bitmap);
if (!buffer) {
LOG(("bitmap_get_buffer failed"));
return false;
}
return image_redraw(bitmap->sprite_area,
ro_plot_origin_x + x * 2,
ro_plot_origin_y - y * 2,
width, height,
bitmap->width,
bitmap->height,
bg,
repeat_x, repeat_y, true,
bitmap_get_opaque(bitmap) ? IMAGE_PLOT_TINCT_OPAQUE :
IMAGE_PLOT_TINCT_ALPHA);
}
/**
* Set the scale for subsequent text plotting.
*/
void ro_plot_set_scale(float scale)
{
ro_plot_scale = scale;
}
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