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netsurf/desktop/knockout.c

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/*
* Copyright 2006 Richard Wilson <info@tinct.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
* Knockout rendering (implementation).
*
* Knockout rendering is an optimisation which is particularly for
* unaccelerated screen redraw. It tries to avoid plotting the same area more
* than once.
*
* If the object is to plot two overlapping rectangles (one large, one small),
* such as:
*
* +-----------------+
* |#################|
* |####+-------+####|
* |####|:::::::|####|
* |####|:::::::|####|
* |####|:::::::|####|
* |####+-------+####|
* |#################|
* +-----------------+
*
* Without knockout rendering we plot the bottom rectangle and then the top one:
*
* +-----------------+ +-----------------+
* |#################| |#################|
* |#################| |####+-------+####|
* |#################| |####|:::::::|####|
* |#################| and then, |####|:::::::|####|
* |#################| |####|:::::::|####|
* |#################| |####+-------+####|
* |#################| |#################|
* +-----------------+ +-----------------+
*
* With knockout rendering, the bottom rectangle is split up into smaller
* ones and each pixel is just plotted once:
*
* +-----------------+
* |#################|
* +----+-------+----+
* |####|:::::::|####|
* |####|:::::::|####|
* |####|:::::::|####|
* +----+-------+----+
* |#################|
* +-----------------+
*/
#include <assert.h>
#include <string.h>
#include "desktop/knockout.h"
#include "desktop/plotters.h"
#include "image/bitmap.h"
#include "utils/log.h"
/* Define to enable knockout debug */
#undef KNOCKOUT_DEBUG
#define KNOCKOUT_ENTRIES 3072 /* 40 bytes each */
#define KNOCKOUT_BOXES 768 /* 28 bytes each */
#define KNOCKOUT_POLYGONS 3072 /* 4 bytes each */
struct knockout_box;
struct knockout_entry;
static void knockout_calculate(int x0, int y0, int x1, int y1, struct knockout_box *box);
static bool knockout_plot_fill_recursive(struct knockout_box *box, plot_style_t *plot_style);
static bool knockout_plot_bitmap_recursive(struct knockout_box *box,
struct knockout_entry *entry);
static bool knockout_plot_line(int x0, int y0, int x1, int y1, const plot_style_t *pstyle);
static bool knockout_plot_polygon(const int *p, unsigned int n, const plot_style_t *pstyle);
static bool knockout_plot_rectangle(int x0, int y0, int x1, int y1, const plot_style_t *plot_style);
static bool knockout_plot_clip(const struct rect *clip);
static bool knockout_plot_text(int x, int y, const char *text, size_t length,
const plot_font_style_t *fstyle);
static bool knockout_plot_disc(int x, int y, int radius, const plot_style_t *pstyle);
static bool knockout_plot_arc(int x, int y, int radius, int angle1, int angle2, const plot_style_t *pstyle);
static bool knockout_plot_bitmap(int x, int y, int width, int height,
struct bitmap *bitmap, colour bg,
bitmap_flags_t flags);
static bool knockout_plot_flush(void);
static bool knockout_plot_group_start(const char *name);
static bool knockout_plot_group_end(void);
static bool knockout_plot_path(const float *p, unsigned int n, colour fill,
float width, colour c, const float transform[6]);
const struct plotter_table knockout_plotters = {
.rectangle = knockout_plot_rectangle,
.line = knockout_plot_line,
.polygon = knockout_plot_polygon,
.clip = knockout_plot_clip,
.text = knockout_plot_text,
.disc = knockout_plot_disc,
.arc = knockout_plot_arc,
.bitmap = knockout_plot_bitmap,
.group_start = knockout_plot_group_start,
.group_end = knockout_plot_group_end,
.flush = knockout_plot_flush,
.path = knockout_plot_path,
.option_knockout = true,
};
typedef enum {
KNOCKOUT_PLOT_RECTANGLE,
KNOCKOUT_PLOT_LINE,
KNOCKOUT_PLOT_POLYGON,
KNOCKOUT_PLOT_FILL, /* knockout, knocked out */
KNOCKOUT_PLOT_CLIP,
KNOCKOUT_PLOT_TEXT,
KNOCKOUT_PLOT_DISC,
KNOCKOUT_PLOT_ARC,
KNOCKOUT_PLOT_BITMAP, /* knockout, knocked out */
KNOCKOUT_PLOT_GROUP_START,
KNOCKOUT_PLOT_GROUP_END,
} knockout_type;
struct knockout_box {
struct rect bbox;
bool deleted; /* box has been deleted, ignore */
struct knockout_box *child;
struct knockout_box *next;
};
struct knockout_entry {
knockout_type type;
struct knockout_box *box; /* relating series of knockout clips */
union {
struct {
int x0;
int y0;
int x1;
int y1;
plot_style_t plot_style;
} rectangle;
struct {
int x0;
int y0;
int x1;
int y1;
plot_style_t plot_style;
} line;
struct {
int *p;
unsigned int n;
plot_style_t plot_style;
} polygon;
struct {
int x0;
int y0;
int x1;
int y1;
plot_style_t plot_style;
} fill;
struct rect clip;
struct {
int x;
int y;
const char *text;
size_t length;
plot_font_style_t font_style;
} text;
struct {
int x;
int y;
int radius;
plot_style_t plot_style;
} disc;
struct {
int x;
int y;
int radius;
int angle1;
int angle2;
plot_style_t plot_style;
} arc;
struct {
int x;
int y;
int width;
int height;
struct bitmap *bitmap;
colour bg;
bitmap_flags_t flags;
} bitmap;
struct {
const char *name;
} group_start;
} data;
};
static struct knockout_entry knockout_entries[KNOCKOUT_ENTRIES];
static struct knockout_box knockout_boxes[KNOCKOUT_BOXES];
static int knockout_polygons[KNOCKOUT_POLYGONS];
static int knockout_entry_cur = 0;
static int knockout_box_cur = 0;
static int knockout_polygon_cur = 0;
static struct knockout_box *knockout_list = NULL;
static struct plotter_table real_plot;
static struct rect clip_cur;
static int nested_depth = 0;
/**
* Start a knockout plotting session
*
* \param ctx the redraw context with real plotter table
* \param knk_ctx updated to copy of ctx, with plotter table replaced
* \return true on success, false otherwise
*/
bool knockout_plot_start(const struct redraw_context *ctx,
struct redraw_context *knk_ctx)
{
/* check if we're recursing */
if (nested_depth++ > 0) {
/* we should already have the knockout renderer as default */
assert(ctx->plot->rectangle == knockout_plotters.rectangle);
*knk_ctx = *ctx;
return true;
}
/* end any previous sessions */
if (knockout_entry_cur > 0)
knockout_plot_end();
/* get copy of real plotter table */
real_plot = *(ctx->plot);
/* set up knockout rendering context */
*knk_ctx = *ctx;
knk_ctx->plot = &knockout_plotters;
return true;
}
/**
* End a knockout plotting session
*
* \return true on success, false otherwise
*/
bool knockout_plot_end(void)
{
/* only output when we've finished any nesting */
if (--nested_depth == 0)
return knockout_plot_flush();
assert(nested_depth > 0);
return true;
}
/**
* Flush the current knockout session to empty the buffers
*
* \return true on success, false otherwise
*/
bool knockout_plot_flush(void)
{
int i;
bool success = true;
struct knockout_box *box;
/* debugging information */
#ifdef KNOCKOUT_DEBUG
LOG(("Entries are %i/%i, %i/%i, %i/%i",
knockout_entry_cur, KNOCKOUT_ENTRIES,
knockout_box_cur, KNOCKOUT_BOXES,
knockout_polygon_cur, KNOCKOUT_POLYGONS));
#endif
for (i = 0; i < knockout_entry_cur; i++) {
switch (knockout_entries[i].type) {
case KNOCKOUT_PLOT_RECTANGLE:
success &= real_plot.rectangle(
knockout_entries[i].data.rectangle.x0,
knockout_entries[i].data.rectangle.y0,
knockout_entries[i].data.rectangle.x1,
knockout_entries[i].data.rectangle.y1,
&knockout_entries[i].data.rectangle.plot_style);
break;
case KNOCKOUT_PLOT_LINE:
success &= real_plot.line(
knockout_entries[i].data.line.x0,
knockout_entries[i].data.line.y0,
knockout_entries[i].data.line.x1,
knockout_entries[i].data.line.y1,
&knockout_entries[i].data.line.plot_style);
break;
case KNOCKOUT_PLOT_POLYGON:
success &= real_plot.polygon(
knockout_entries[i].data.polygon.p,
knockout_entries[i].data.polygon.n,
&knockout_entries[i].data.polygon.plot_style);
break;
case KNOCKOUT_PLOT_FILL:
box = knockout_entries[i].box->child;
if (box)
success &= knockout_plot_fill_recursive(box,
&knockout_entries[i].data.fill.plot_style);
else if (!knockout_entries[i].box->deleted)
success &= real_plot.rectangle(
knockout_entries[i].data.fill.x0,
knockout_entries[i].data.fill.y0,
knockout_entries[i].data.fill.x1,
knockout_entries[i].data.fill.y1,
&knockout_entries[i].data.fill.plot_style);
break;
case KNOCKOUT_PLOT_CLIP:
success &= real_plot.clip(
&knockout_entries[i].data.clip);
break;
case KNOCKOUT_PLOT_TEXT:
success &= real_plot.text(
knockout_entries[i].data.text.x,
knockout_entries[i].data.text.y,
knockout_entries[i].data.text.text,
knockout_entries[i].data.text.length,
&knockout_entries[i].data.text.font_style);
break;
case KNOCKOUT_PLOT_DISC:
success &= real_plot.disc(
knockout_entries[i].data.disc.x,
knockout_entries[i].data.disc.y,
knockout_entries[i].data.disc.radius,
&knockout_entries[i].data.disc.plot_style);
break;
case KNOCKOUT_PLOT_ARC:
success &= real_plot.arc(
knockout_entries[i].data.arc.x,
knockout_entries[i].data.arc.y,
knockout_entries[i].data.arc.radius,
knockout_entries[i].data.arc.angle1,
knockout_entries[i].data.arc.angle2,
&knockout_entries[i].data.arc.plot_style);
break;
case KNOCKOUT_PLOT_BITMAP:
box = knockout_entries[i].box->child;
if (box) {
success &= knockout_plot_bitmap_recursive(box,
&knockout_entries[i]);
} else if (!knockout_entries[i].box->deleted) {
success &= real_plot.bitmap(
knockout_entries[i].data.
bitmap.x,
knockout_entries[i].data.
bitmap.y,
knockout_entries[i].data.
bitmap.width,
knockout_entries[i].data.
bitmap.height,
knockout_entries[i].data.
bitmap.bitmap,
knockout_entries[i].data.
bitmap.bg,
knockout_entries[i].data.
bitmap.flags);
}
break;
case KNOCKOUT_PLOT_GROUP_START:
success &= real_plot.group_start(
knockout_entries[i].data.group_start.name);
break;
case KNOCKOUT_PLOT_GROUP_END:
success &= real_plot.group_end();
break;
}
}
knockout_entry_cur = 0;
knockout_box_cur = 0;
knockout_polygon_cur = 0;
knockout_list = NULL;
return success;
}
/**
* Knockout a section of previous rendering
*
* \param x0 the left edge of the removal box
* \param y0 the bottom edge of the removal box
* \param x1 the right edge of the removal box
* \param y1 the top edge of the removal box
* \param box the parent box set to consider, or NULL for top level
*/
void knockout_calculate(int x0, int y0, int x1, int y1, struct knockout_box *owner)
{
struct knockout_box *box;
struct knockout_box *parent;
struct knockout_box *prev = NULL;
int nx0, ny0, nx1, ny1;
if (owner == NULL)
box = knockout_list;
else
box = owner->child;
for (parent = box; parent; parent = parent->next) {
/* permanently delink deleted nodes */
if (parent->deleted) {
if (prev) {
/* not the first valid element: just skip future */
prev->next = parent->next;
} else {
if (owner) {
/* first valid element: update child reference */
owner->child = parent->next;
/* have we deleted all child nodes? */
if (!owner->child)
owner->deleted = true;
} else {
/* we are the head of the list */
knockout_list = parent->next;
}
}
continue;
} else {
prev = parent;
}
/* get the parent dimensions */
nx0 = parent->bbox.x0;
ny0 = parent->bbox.y0;
nx1 = parent->bbox.x1;
ny1 = parent->bbox.y1;
/* reject non-overlapping boxes */
if ((nx0 >= x1) || (nx1 <= x0) || (ny0 >= y1) || (ny1 <= y0))
continue;
/* check for a total knockout */
if ((x0 <= nx0) && (x1 >= nx1) && (y0 <= ny0) && (y1 >= ny1)) {
parent->deleted = true;
continue;
}
/* has the box been replaced by children? */
if (parent->child) {
knockout_calculate(x0, y0, x1, y1, parent);
} else {
/* we need a maximum of 4 child boxes */
if (knockout_box_cur + 4 >= KNOCKOUT_BOXES) {
knockout_plot_flush();
return;
}
/* clip top */
if (y1 < ny1) {
knockout_boxes[knockout_box_cur].bbox.x0 = nx0;
knockout_boxes[knockout_box_cur].bbox.y0 = y1;
knockout_boxes[knockout_box_cur].bbox.x1 = nx1;
knockout_boxes[knockout_box_cur].bbox.y1 = ny1;
knockout_boxes[knockout_box_cur].deleted = false;
knockout_boxes[knockout_box_cur].child = NULL;
knockout_boxes[knockout_box_cur].next = parent->child;
parent->child = &knockout_boxes[knockout_box_cur++];
ny1 = y1;
}
/* clip bottom */
if (y0 > ny0) {
knockout_boxes[knockout_box_cur].bbox.x0 = nx0;
knockout_boxes[knockout_box_cur].bbox.y0 = ny0;
knockout_boxes[knockout_box_cur].bbox.x1 = nx1;
knockout_boxes[knockout_box_cur].bbox.y1 = y0;
knockout_boxes[knockout_box_cur].deleted = false;
knockout_boxes[knockout_box_cur].child = NULL;
knockout_boxes[knockout_box_cur].next = parent->child;
parent->child = &knockout_boxes[knockout_box_cur++];
ny0 = y0;
}
/* clip right */
if (x1 < nx1) {
knockout_boxes[knockout_box_cur].bbox.x0 = x1;
knockout_boxes[knockout_box_cur].bbox.y0 = ny0;
knockout_boxes[knockout_box_cur].bbox.x1 = nx1;
knockout_boxes[knockout_box_cur].bbox.y1 = ny1;
knockout_boxes[knockout_box_cur].deleted = false;
knockout_boxes[knockout_box_cur].child = NULL;
knockout_boxes[knockout_box_cur].next = parent->child;
parent->child = &knockout_boxes[knockout_box_cur++];
/* nx1 isn't used again, but if it was it would
* need to be updated to x1 here. */
}
/* clip left */
if (x0 > nx0) {
knockout_boxes[knockout_box_cur].bbox.x0 = nx0;
knockout_boxes[knockout_box_cur].bbox.y0 = ny0;
knockout_boxes[knockout_box_cur].bbox.x1 = x0;
knockout_boxes[knockout_box_cur].bbox.y1 = ny1;
knockout_boxes[knockout_box_cur].deleted = false;
knockout_boxes[knockout_box_cur].child = NULL;
knockout_boxes[knockout_box_cur].next = parent->child;
parent->child = &knockout_boxes[knockout_box_cur++];
/* nx0 isn't used again, but if it was it would
* need to be updated to x0 here. */
}
}
}
}
bool knockout_plot_fill_recursive(struct knockout_box *box, plot_style_t *plot_style)
{
bool success = true;
struct knockout_box *parent;
for (parent = box; parent; parent = parent->next) {
if (parent->deleted)
continue;
if (parent->child)
knockout_plot_fill_recursive(parent->child, plot_style);
else
success &= real_plot.rectangle(parent->bbox.x0,
parent->bbox.y0,
parent->bbox.x1,
parent->bbox.y1,
plot_style);
}
return success;
}
bool knockout_plot_bitmap_recursive(struct knockout_box *box,
struct knockout_entry *entry)
{
bool success = true;
struct knockout_box *parent;
for (parent = box; parent; parent = parent->next) {
if (parent->deleted)
continue;
if (parent->child)
knockout_plot_bitmap_recursive(parent->child, entry);
else {
success &= real_plot.clip(&parent->bbox);
success &= real_plot.bitmap(entry->data.bitmap.x,
entry->data.bitmap.y,
entry->data.bitmap.width,
entry->data.bitmap.height,
entry->data.bitmap.bitmap,
entry->data.bitmap.bg,
entry->data.bitmap.flags);
}
}
return success;
}
bool knockout_plot_rectangle(int x0, int y0, int x1, int y1, const plot_style_t *pstyle)
{
int kx0, ky0, kx1, ky1;
if (pstyle->fill_type != PLOT_OP_TYPE_NONE) {
/* filled draw */
/* get our bounds */
kx0 = (x0 > clip_cur.x0) ? x0 : clip_cur.x0;
ky0 = (y0 > clip_cur.y0) ? y0 : clip_cur.y0;
kx1 = (x1 < clip_cur.x1) ? x1 : clip_cur.x1;
ky1 = (y1 < clip_cur.y1) ? y1 : clip_cur.y1;
if ((kx0 > clip_cur.x1) || (kx1 < clip_cur.x0) ||
(ky0 > clip_cur.y1) || (ky1 < clip_cur.y0))
return true;
/* fills both knock out and get knocked out */
knockout_calculate(kx0, ky0, kx1, ky1, NULL);
knockout_boxes[knockout_box_cur].bbox.x0 = x0;
knockout_boxes[knockout_box_cur].bbox.y0 = y0;
knockout_boxes[knockout_box_cur].bbox.x1 = x1;
knockout_boxes[knockout_box_cur].bbox.y1 = y1;
knockout_boxes[knockout_box_cur].deleted = false;
knockout_boxes[knockout_box_cur].child = NULL;
knockout_boxes[knockout_box_cur].next = knockout_list;
knockout_list = &knockout_boxes[knockout_box_cur];
knockout_entries[knockout_entry_cur].box = &knockout_boxes[knockout_box_cur];
knockout_entries[knockout_entry_cur].data.fill.x0 = x0;
knockout_entries[knockout_entry_cur].data.fill.y0 = y0;
knockout_entries[knockout_entry_cur].data.fill.x1 = x1;
knockout_entries[knockout_entry_cur].data.fill.y1 = y1;
knockout_entries[knockout_entry_cur].data.fill.plot_style = *pstyle;
knockout_entries[knockout_entry_cur].data.fill.plot_style.stroke_type = PLOT_OP_TYPE_NONE; /* ensure we only plot the fill */
knockout_entries[knockout_entry_cur].type = KNOCKOUT_PLOT_FILL;
if ((++knockout_entry_cur >= KNOCKOUT_ENTRIES) ||
(++knockout_box_cur >= KNOCKOUT_BOXES))
knockout_plot_flush();
}
if (pstyle->stroke_type != PLOT_OP_TYPE_NONE) {
/* draw outline */
knockout_entries[knockout_entry_cur].data.rectangle.x0 = x0;
knockout_entries[knockout_entry_cur].data.rectangle.y0 = y0;
knockout_entries[knockout_entry_cur].data.rectangle.x1 = x1;
knockout_entries[knockout_entry_cur].data.rectangle.y1 = y1;
knockout_entries[knockout_entry_cur].data.fill.plot_style = *pstyle;
knockout_entries[knockout_entry_cur].data.fill.plot_style.fill_type = PLOT_OP_TYPE_NONE; /* ensure we only plot the outline */
knockout_entries[knockout_entry_cur].type = KNOCKOUT_PLOT_RECTANGLE;
if (++knockout_entry_cur >= KNOCKOUT_ENTRIES)
knockout_plot_flush();
}
return true;
}
bool knockout_plot_line(int x0, int y0, int x1, int y1, const plot_style_t *pstyle)
{
knockout_entries[knockout_entry_cur].data.line.x0 = x0;
knockout_entries[knockout_entry_cur].data.line.y0 = y0;
knockout_entries[knockout_entry_cur].data.line.x1 = x1;
knockout_entries[knockout_entry_cur].data.line.y1 = y1;
knockout_entries[knockout_entry_cur].data.line.plot_style = *pstyle;
knockout_entries[knockout_entry_cur].type = KNOCKOUT_PLOT_LINE;
if (++knockout_entry_cur >= KNOCKOUT_ENTRIES)
knockout_plot_flush();
return true;
}
bool knockout_plot_polygon(const int *p, unsigned int n, const plot_style_t *pstyle)
{
bool success = true;
int *dest;
/* ensure we have sufficient room even when flushed */
if (n * 2 >= KNOCKOUT_POLYGONS) {
knockout_plot_flush();
success = real_plot.polygon(p, n, pstyle);
return success;
}
/* ensure we have enough room right now */
if (knockout_polygon_cur + n * 2 >= KNOCKOUT_POLYGONS)
knockout_plot_flush();
/* copy our data */
dest = &(knockout_polygons[knockout_polygon_cur]);
memcpy(dest, p, n * 2 * sizeof(int));
knockout_polygon_cur += n * 2;
knockout_entries[knockout_entry_cur].data.polygon.p = dest;
knockout_entries[knockout_entry_cur].data.polygon.n = n;
knockout_entries[knockout_entry_cur].data.polygon.plot_style = *pstyle;
knockout_entries[knockout_entry_cur].type = KNOCKOUT_PLOT_POLYGON;
if (++knockout_entry_cur >= KNOCKOUT_ENTRIES)
knockout_plot_flush();
return true;
}
bool knockout_plot_path(const float *p, unsigned int n, colour fill,
float width, colour c, const float transform[6])
{
knockout_plot_flush();
return real_plot.path(p, n, fill, width, c, transform);
}
bool knockout_plot_clip(const struct rect *clip)
{
if (clip->x1 < clip->x0 || clip->y0 > clip->y1) {
#ifdef KNOCKOUT_DEBUG
LOG(("bad clip rectangle %i %i %i %i",
clip->x0, clip->y0, clip->x1, clip->y1));
#endif
return false;
}
/* memorise clip for bitmap tiling */
clip_cur = *clip;
knockout_entries[knockout_entry_cur].data.clip = *clip;
knockout_entries[knockout_entry_cur].type = KNOCKOUT_PLOT_CLIP;
if (++knockout_entry_cur >= KNOCKOUT_ENTRIES)
knockout_plot_flush();
return true;
}
bool knockout_plot_text(int x, int y, const char *text, size_t length,
const plot_font_style_t *fstyle)
{
knockout_entries[knockout_entry_cur].data.text.x = x;
knockout_entries[knockout_entry_cur].data.text.y = y;
knockout_entries[knockout_entry_cur].data.text.text = text;
knockout_entries[knockout_entry_cur].data.text.length = length;
knockout_entries[knockout_entry_cur].data.text.font_style = *fstyle;
knockout_entries[knockout_entry_cur].type = KNOCKOUT_PLOT_TEXT;
if (++knockout_entry_cur >= KNOCKOUT_ENTRIES)
knockout_plot_flush();
return true;
}
bool knockout_plot_disc(int x, int y, int radius, const plot_style_t *pstyle)
{
knockout_entries[knockout_entry_cur].data.disc.x = x;
knockout_entries[knockout_entry_cur].data.disc.y = y;
knockout_entries[knockout_entry_cur].data.disc.radius = radius;
knockout_entries[knockout_entry_cur].data.disc.plot_style = *pstyle;
knockout_entries[knockout_entry_cur].type = KNOCKOUT_PLOT_DISC;
if (++knockout_entry_cur >= KNOCKOUT_ENTRIES)
knockout_plot_flush();
return true;
}
bool knockout_plot_arc(int x, int y, int radius, int angle1, int angle2, const plot_style_t *pstyle)
{
knockout_entries[knockout_entry_cur].data.arc.x = x;
knockout_entries[knockout_entry_cur].data.arc.y = y;
knockout_entries[knockout_entry_cur].data.arc.radius = radius;
knockout_entries[knockout_entry_cur].data.arc.angle1 = angle1;
knockout_entries[knockout_entry_cur].data.arc.angle2 = angle2;
knockout_entries[knockout_entry_cur].data.arc.plot_style = *pstyle;
knockout_entries[knockout_entry_cur].type = KNOCKOUT_PLOT_ARC;
if (++knockout_entry_cur >= KNOCKOUT_ENTRIES)
knockout_plot_flush();
return true;
}
bool knockout_plot_bitmap(int x, int y, int width, int height,
struct bitmap *bitmap, colour bg,
bitmap_flags_t flags)
{
int kx0, ky0, kx1, ky1;
/* get our bounds */
kx0 = clip_cur.x0;
ky0 = clip_cur.y0;
kx1 = clip_cur.x1;
ky1 = clip_cur.y1;
if (!(flags & BITMAPF_REPEAT_X)) {
if (x > kx0)
kx0 = x;
if (x + width < kx1)
kx1 = x + width;
if ((kx0 > clip_cur.x1) || (kx1 < clip_cur.x0))
return true;
}
if (!(flags & BITMAPF_REPEAT_Y)) {
if (y > ky0)
ky0 = y;
if (y + height < ky1)
ky1 = y + height;
if ((ky0 > clip_cur.y1) || (ky1 < clip_cur.y0))
return true;
}
/* tiled bitmaps both knock out and get knocked out */
if (bitmap_get_opaque(bitmap))
knockout_calculate(kx0, ky0, kx1, ky1, NULL);
knockout_boxes[knockout_box_cur].bbox.x0 = kx0;
knockout_boxes[knockout_box_cur].bbox.y0 = ky0;
knockout_boxes[knockout_box_cur].bbox.x1 = kx1;
knockout_boxes[knockout_box_cur].bbox.y1 = ky1;
knockout_boxes[knockout_box_cur].deleted = false;
knockout_boxes[knockout_box_cur].child = NULL;
knockout_boxes[knockout_box_cur].next = knockout_list;
knockout_list = &knockout_boxes[knockout_box_cur];
knockout_entries[knockout_entry_cur].box = &knockout_boxes[knockout_box_cur];
knockout_entries[knockout_entry_cur].data.bitmap.x = x;
knockout_entries[knockout_entry_cur].data.bitmap.y = y;
knockout_entries[knockout_entry_cur].data.bitmap.width = width;
knockout_entries[knockout_entry_cur].data.bitmap.height = height;
knockout_entries[knockout_entry_cur].data.bitmap.bitmap = bitmap;
knockout_entries[knockout_entry_cur].data.bitmap.bg = bg;
knockout_entries[knockout_entry_cur].data.bitmap.flags = flags;
knockout_entries[knockout_entry_cur].type = KNOCKOUT_PLOT_BITMAP;
if ((++knockout_entry_cur >= KNOCKOUT_ENTRIES) ||
(++knockout_box_cur >= KNOCKOUT_BOXES))
knockout_plot_flush();
return knockout_plot_clip(&clip_cur);
}
bool knockout_plot_group_start(const char *name)
{
if (real_plot.group_start == NULL) {
return true;
}
knockout_entries[knockout_entry_cur].data.group_start.name = name;
knockout_entries[knockout_entry_cur].type = KNOCKOUT_PLOT_GROUP_START;
if (++knockout_entry_cur >= KNOCKOUT_ENTRIES)
knockout_plot_flush();
return true;
}
bool knockout_plot_group_end(void)
{
if (real_plot.group_end == NULL) {
return true;
}
knockout_entries[knockout_entry_cur].type = KNOCKOUT_PLOT_GROUP_END;
if (++knockout_entry_cur >= KNOCKOUT_ENTRIES)
knockout_plot_flush();
return true;
}
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