netsurf/frontends/riscos/plotters.c
2017-02-19 11:32:17 +00:00

701 lines
18 KiB
C

/*
* 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
* RISC OS screen plotter implementation.
*/
#include <stdbool.h>
#include <math.h>
#include "oslib/colourtrans.h"
#include "oslib/draw.h"
#include "oslib/os.h"
#include "utils/log.h"
#include "netsurf/plotters.h"
#include "riscos/bitmap.h"
#include "riscos/image.h"
#include "riscos/gui.h"
#include "riscos/font.h"
#include "riscos/oslib_pre7.h"
int ro_plot_origin_x = 0;
int ro_plot_origin_y = 0;
/** One version of the A9home OS is incapable of drawing patterned lines */
bool ro_plot_patterned_lines = true;
/**
* plot a path on RISC OS
*/
static nserror
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 NSERROR_INVALID;
}
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 NSERROR_INVALID;
}
return NSERROR_OK;
}
/**
* \brief Sets a clip rectangle for subsequent plot operations.
*
* \param ctx The current redraw context.
* \param clip The rectangle to limit all subsequent plot
* operations within.
* \return NSERROR_OK on success else error code.
*/
static nserror
ro_plot_clip(const struct redraw_context *ctx, const struct rect *clip)
{
os_error *error;
char buf[12];
int clip_x0 = ro_plot_origin_x + clip->x0 * 2;
int clip_y0 = ro_plot_origin_y - clip->y0 * 2 - 1;
int clip_x1 = ro_plot_origin_x + clip->x1 * 2 - 1;
int 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 NSERROR_BAD_SIZE;
}
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 NSERROR_INVALID;
}
return NSERROR_OK;
}
/**
* Plots an arc
*
* plot an arc segment around (x,y), anticlockwise from angle1
* to angle2. Angles are measured anticlockwise from
* horizontal, in degrees.
*
* \param ctx The current redraw context.
* \param style Style controlling the arc plot.
* \param x The x coordinate of the arc.
* \param y The y coordinate of the arc.
* \param radius The radius of the arc.
* \param angle1 The start angle of the arc.
* \param angle2 The finish angle of the arc.
* \return NSERROR_OK on success else error code.
*/
static nserror
ro_plot_arc(const struct redraw_context *ctx,
const plot_style_t *style,
int x, int y, int radius, int angle1, int angle2)
{
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(style->fill_colour << 8, 0,
os_ACTION_OVERWRITE, 0, 0);
if (error) {
LOG("xcolourtrans_set_gcol: 0x%x: %s",
error->errnum, error->errmess);
return NSERROR_INVALID;
}
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 NSERROR_INVALID;
}
error = xos_plot(os_MOVE_TO, sx, sy); /* move to start */
if (error) {
LOG("xos_plot: 0x%x: %s", error->errnum, error->errmess);
return NSERROR_INVALID;
}
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 NSERROR_INVALID;
}
return NSERROR_OK;
}
/**
* Plots a circle
*
* Plot a circle centered on (x,y), which is optionally filled.
*
* \param ctx The current redraw context.
* \param style Style controlling the circle plot.
* \param x The x coordinate of the circle.
* \param y The y coordinate of the circle.
* \param radius The radius of the circle.
* \return NSERROR_OK on success else error code.
*/
static nserror
ro_plot_disc(const struct redraw_context *ctx,
const plot_style_t *style,
int x, int y, int radius)
{
os_error *error;
if (style->fill_type != PLOT_OP_TYPE_NONE) {
error = xcolourtrans_set_gcol(style->fill_colour << 8, 0,
os_ACTION_OVERWRITE, 0, 0);
if (error) {
LOG("xcolourtrans_set_gcol: 0x%x: %s",
error->errnum, error->errmess);
return NSERROR_INVALID;
}
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 NSERROR_INVALID;
}
error = xos_plot(os_PLOT_CIRCLE | os_PLOT_BY, radius * 2, 0);
if (error) {
LOG("xos_plot: 0x%x: %s", error->errnum, error->errmess);
return NSERROR_INVALID;
}
}
if (style->stroke_type != PLOT_OP_TYPE_NONE) {
error = xcolourtrans_set_gcol(style->stroke_colour << 8, 0,
os_ACTION_OVERWRITE, 0, 0);
if (error) {
LOG("xcolourtrans_set_gcol: 0x%x: %s",
error->errnum, error->errmess);
return NSERROR_INVALID;
}
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 NSERROR_INVALID;
}
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 NSERROR_INVALID;
}
}
return NSERROR_OK;
}
/**
* Plots a line
*
* plot a line from (x0,y0) to (x1,y1). Coordinates are at
* centre of line width/thickness.
*
* \param ctx The current redraw context.
* \param style Style controlling the line plot.
* \param line A rectangle defining the line to be drawn
* \return NSERROR_OK on success else error code.
*/
static nserror
ro_plot_line(const struct redraw_context *ctx,
const plot_style_t *style,
const struct rect *line)
{
if (style->stroke_type != PLOT_OP_TYPE_NONE) {
const int path[] = {
draw_MOVE_TO,
(ro_plot_origin_x + line->x0 * 2) * 256,
(ro_plot_origin_y - line->y0 * 2 - 1) * 256,
draw_LINE_TO,
(ro_plot_origin_x + line->x1 * 2) * 256,
(ro_plot_origin_y - line->y1 * 2 - 1) * 256,
draw_END_PATH };
bool dotted = false;
bool dashed = false;
if (style->stroke_type == PLOT_OP_TYPE_DOT)
dotted = true;
if (style->stroke_type == PLOT_OP_TYPE_DASH)
dashed = true;
return ro_plot_draw_path((const draw_path *)path,
style->stroke_width,
style->stroke_colour,
dotted, dashed);
}
return NSERROR_OK;
}
/**
* Plots a rectangle.
*
* The rectangle can be filled an outline or both controlled
* by the plot style The line can be solid, dotted or
* dashed. Top left corner at (x0,y0) and rectangle has given
* width and height.
*
* \param ctx The current redraw context.
* \param style Style controlling the rectangle plot.
* \param rect A rectangle defining the line to be drawn
* \return NSERROR_OK on success else error code.
*/
static nserror
ro_plot_rectangle(const struct redraw_context *ctx,
const plot_style_t *style,
const struct rect *rect)
{
if (style->fill_type != PLOT_OP_TYPE_NONE) {
os_error *error;
error = xcolourtrans_set_gcol(style->fill_colour << 8,
colourtrans_USE_ECFS_GCOL,
os_ACTION_OVERWRITE, 0, 0);
if (error) {
LOG("xcolourtrans_set_gcol: 0x%x: %s",
error->errnum, error->errmess);
return NSERROR_INVALID;
}
error = xos_plot(os_MOVE_TO,
ro_plot_origin_x + rect->x0 * 2,
ro_plot_origin_y - rect->y0 * 2 - 1);
if (error) {
LOG("xos_plot: 0x%x: %s", error->errnum, error->errmess);
return NSERROR_INVALID;
}
error = xos_plot(os_PLOT_RECTANGLE | os_PLOT_TO,
ro_plot_origin_x + rect->x1 * 2 - 1,
ro_plot_origin_y - rect->y1 * 2);
if (error) {
LOG("xos_plot: 0x%x: %s", error->errnum, error->errmess);
return NSERROR_INVALID;
}
}
if (style->stroke_type != PLOT_OP_TYPE_NONE) {
bool dotted = false;
bool dashed = false;
const int path[] = {
draw_MOVE_TO,
(ro_plot_origin_x + rect->x0 * 2) * 256,
(ro_plot_origin_y - rect->y0 * 2 - 1) * 256,
draw_LINE_TO,
(ro_plot_origin_x + (rect->x1) * 2) * 256,
(ro_plot_origin_y - rect->y0 * 2 - 1) * 256,
draw_LINE_TO,
(ro_plot_origin_x + (rect->x1) * 2) * 256,
(ro_plot_origin_y - (rect->y1) * 2 - 1) * 256,
draw_LINE_TO,
(ro_plot_origin_x + rect->x0 * 2) * 256,
(ro_plot_origin_y - (rect->y1) * 2 - 1) * 256,
draw_CLOSE_LINE,
(ro_plot_origin_x + rect->x0 * 2) * 256,
(ro_plot_origin_y - rect->y0 * 2 - 1) * 256,
draw_END_PATH
};
if (style->stroke_type == PLOT_OP_TYPE_DOT)
dotted = true;
if (style->stroke_type == PLOT_OP_TYPE_DASH)
dashed = true;
ro_plot_draw_path((const draw_path *)path,
style->stroke_width,
style->stroke_colour,
dotted,
dashed);
}
return NSERROR_OK;
}
/**
* Plot a polygon
*
* Plots a filled polygon with straight lines between
* points. The lines around the edge of the ploygon are not
* plotted. The polygon is filled with the non-zero winding
* rule.
*
* \param ctx The current redraw context.
* \param style Style controlling the polygon plot.
* \param p verticies of polygon
* \param n number of verticies.
* \return NSERROR_OK on success else error code.
*/
static nserror
ro_plot_polygon(const struct redraw_context *ctx,
const plot_style_t *style,
const int *p,
unsigned int n)
{
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(style->fill_colour << 8,
0, os_ACTION_OVERWRITE, 0, 0);
if (error) {
LOG("xcolourtrans_set_gcol: 0x%x: %s",
error->errnum, error->errmess);
return NSERROR_INVALID;
}
error = xdraw_fill((draw_path *) path, 0, 0, 0);
if (error) {
LOG("xdraw_fill: 0x%x: %s", error->errnum, error->errmess);
return NSERROR_INVALID;
}
return NSERROR_OK;
}
/**
* Plots a path.
*
* Path plot consisting of cubic Bezier curves. Line and fill colour is
* controlled by the plot style.
*
* \param ctx The current redraw context.
* \param pstyle Style controlling the path plot.
* \param p elements of path
* \param n nunber of elements on path
* \param width The width of the path
* \param transform A transform to apply to the path.
* \return NSERROR_OK on success else error code.
*/
static nserror
ro_plot_path(const struct redraw_context *ctx,
const plot_style_t *pstyle,
const float *p,
unsigned int n,
float width,
const float transform[6])
{
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 NSERROR_OK;
}
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 (pstyle->fill_colour != NS_TRANSPARENT) {
error = xcolourtrans_set_gcol(pstyle->fill_colour << 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 (pstyle->stroke_colour != NS_TRANSPARENT) {
error = xcolourtrans_set_gcol(pstyle->stroke_colour << 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;
}
}
free(path);
return NSERROR_OK;
error:
free(path);
return NSERROR_INVALID;
}
/**
* Plot a bitmap
*
* Tiled plot of a bitmap image. (x,y) gives the top left
* coordinate of an explicitly placed tile. From this tile the
* image can repeat in all four directions -- up, down, left
* and right -- to the extents given by the current clip
* rectangle.
*
* The bitmap_flags say whether to tile in the x and y
* directions. If not tiling in x or y directions, the single
* image is plotted. The width and height give the dimensions
* the image is to be scaled to.
*
* \param ctx The current redraw context.
* \param bitmap The bitmap to plot
* \param x The x coordinate to plot the bitmap
* \param y The y coordiante to plot the bitmap
* \param width The width of area to plot the bitmap into
* \param height The height of area to plot the bitmap into
* \param bg the background colour to alpha blend into
* \param flags the flags controlling the type of plot operation
* \return NSERROR_OK on success else error code.
*/
static nserror
ro_plot_bitmap(const struct redraw_context *ctx,
struct bitmap *bitmap,
int x, int y,
int width,
int height,
colour bg,
bitmap_flags_t flags)
{
const uint8_t *buffer;
buffer = riscos_bitmap_get_buffer(bitmap);
if (!buffer) {
LOG("bitmap_get_buffer failed");
return NSERROR_INVALID;
}
if (!image_redraw(bitmap->sprite_area,
ro_plot_origin_x + x * 2,
ro_plot_origin_y - y * 2,
width, height,
bitmap->width,
bitmap->height,
bg,
flags & BITMAPF_REPEAT_X, flags & BITMAPF_REPEAT_Y,
flags & BITMAPF_REPEAT_X || flags & BITMAPF_REPEAT_Y,
riscos_bitmap_get_opaque(bitmap) ? IMAGE_PLOT_TINCT_OPAQUE :
IMAGE_PLOT_TINCT_ALPHA)) {
return NSERROR_INVALID;
}
return NSERROR_OK;
}
/**
* Text plotting.
*
* \param ctx The current redraw context.
* \param fstyle plot style for this text
* \param x x coordinate
* \param y y coordinate
* \param text UTF-8 string to plot
* \param length length of string, in bytes
* \return NSERROR_OK on success else error code.
*/
static nserror
ro_plot_text(const struct redraw_context *ctx,
const struct plot_font_style *fstyle,
int x,
int y,
const char *text,
size_t length)
{
os_error *error;
error = xcolourtrans_set_font_colours(font_CURRENT,
fstyle->background << 8, fstyle->foreground << 8,
14, 0, 0, 0);
if (error) {
LOG("xcolourtrans_set_font_colours: 0x%x: %s",
error->errnum, error->errmess);
return NSERROR_INVALID;
}
if (!nsfont_paint(fstyle, text, length,
ro_plot_origin_x + x * 2,
ro_plot_origin_y - y * 2)) {
return NSERROR_INVALID;
}
return NSERROR_OK;
}
/**
* RISC OS plotter operation table
*/
const struct plotter_table ro_plotters = {
.rectangle = ro_plot_rectangle,
.line = ro_plot_line,
.polygon = ro_plot_polygon,
.clip = ro_plot_clip,
.text = ro_plot_text,
.disc = ro_plot_disc,
.arc = ro_plot_arc,
.bitmap = ro_plot_bitmap,
.path = ro_plot_path,
.option_knockout = true,
};