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netsurf/content/handlers/html/redraw.c

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/*
* Copyright 2004-2008 James Bursa <bursa@users.sourceforge.net>
* Copyright 2004-2007 John M Bell <jmb202@ecs.soton.ac.uk>
* Copyright 2004-2007 Richard Wilson <info@tinct.net>
* Copyright 2005-2006 Adrian Lees <adrianl@users.sourceforge.net>
* Copyright 2006 Rob Kendrick <rjek@netsurf-browser.org>
* Copyright 2008 Michael Drake <tlsa@netsurf-browser.org>
* Copyright 2009 Paul Blokus <paul_pl@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
*
* Redrawing CONTENT_HTML implementation.
*/
#include "utils/config.h"
#include <assert.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <dom/dom.h>
#include "utils/log.h"
#include "utils/messages.h"
#include "utils/utils.h"
#include "utils/nsoption.h"
#include "utils/corestrings.h"
#include "netsurf/content.h"
#include "netsurf/browser_window.h"
#include "netsurf/plotters.h"
#include "netsurf/bitmap.h"
#include "netsurf/layout.h"
#include "content/content.h"
#include "content/content_protected.h"
#include "content/textsearch.h"
#include "css/utils.h"
#include "desktop/selection.h"
#include "desktop/print.h"
#include "desktop/scrollbar.h"
#include "desktop/textarea.h"
#include "desktop/gui_internal.h"
#include "html/box.h"
#include "html/box_inspect.h"
#include "html/box_manipulate.h"
#include "html/font.h"
#include "html/form_internal.h"
#include "html/private.h"
#include "html/layout.h"
bool html_redraw_debug = false;
/**
* Determine if a box has a background that needs drawing
*
* \param box Box to consider
* \return True if box has a background, false otherwise.
*/
static bool html_redraw_box_has_background(struct box *box)
{
if (box->background != NULL)
return true;
if (box->style != NULL) {
css_color colour;
css_computed_background_color(box->style, &colour);
if (nscss_color_is_transparent(colour) == false)
return true;
}
return false;
}
/**
* Find the background box for a box
*
* \param box Box to find background box for
* \return Pointer to background box, or NULL if there is none
*/
static struct box *html_redraw_find_bg_box(struct box *box)
{
/* Thanks to backwards compatibility, CSS defines the following:
*
* + If the box is for the root element and it has a background,
* use that (and then process the body box with no special case)
* + If the box is for the root element and it has no background,
* then use the background (if any) from the body element as if
* it were specified on the root. Then, when the box for the body
* element is processed, ignore the background.
* + For any other box, just use its own styling.
*/
if (box->parent == NULL) {
/* Root box */
if (html_redraw_box_has_background(box))
return box;
/* No background on root box: consider body box, if any */
if (box->children != NULL) {
if (html_redraw_box_has_background(box->children))
return box->children;
}
} else if (box->parent != NULL && box->parent->parent == NULL) {
/* Body box: only render background if root has its own */
if (html_redraw_box_has_background(box) &&
html_redraw_box_has_background(box->parent))
return box;
} else {
/* Any other box */
if (html_redraw_box_has_background(box))
return box;
}
return NULL;
}
/**
* Redraw a short text string, complete with highlighting
* (for selection/search)
*
* \param utf8_text pointer to UTF-8 text string
* \param utf8_len length of string, in bytes
* \param offset byte offset within textual representation
* \param space width of space that follows string (0 = no space)
* \param fstyle text style to use (pass text size unscaled)
* \param x x ordinate at which to plot text
* \param y y ordinate at which to plot text
* \param clip pointer to current clip rectangle
* \param height height of text string
* \param scale current display scale (1.0 = 100%)
* \param excluded exclude this text string from the selection
* \param c Content being redrawn.
* \param sel Selection context
* \param search Search context
* \param ctx current redraw context
* \return true iff successful and redraw should proceed
*/
static bool
text_redraw(const char *utf8_text,
size_t utf8_len,
size_t offset,
int space,
const plot_font_style_t *fstyle,
int x,
int y,
const struct rect *clip,
int height,
float scale,
bool excluded,
struct content *c,
const struct selection *sel,
const struct redraw_context *ctx)
{
bool highlighted = false;
plot_font_style_t plot_fstyle = *fstyle;
nserror res;
/* Need scaled text size to pass to plotters */
plot_fstyle.size *= scale;
/* is this box part of a selection? */
if (!excluded && ctx->interactive == true) {
unsigned len = utf8_len + (space ? 1 : 0);
unsigned start_idx;
unsigned end_idx;
/* first try the browser window's current selection */
if (selection_highlighted(sel,
offset,
offset + len,
&start_idx,
&end_idx)) {
highlighted = true;
}
/* what about the current search operation, if any? */
if (!highlighted &&
(c->textsearch.context != NULL) &&
content_textsearch_ishighlighted(c->textsearch.context,
offset,
offset + len,
&start_idx,
&end_idx)) {
highlighted = true;
}
/* \todo make search terms visible within selected text */
if (highlighted) {
struct rect r;
unsigned endtxt_idx = end_idx;
bool clip_changed = false;
bool text_visible = true;
int startx, endx;
plot_style_t pstyle_fill_hback = *plot_style_fill_white;
plot_font_style_t fstyle_hback = plot_fstyle;
if (end_idx > utf8_len) {
/* adjust for trailing space, not present in
* utf8_text */
assert(end_idx == utf8_len + 1);
endtxt_idx = utf8_len;
}
res = guit->layout->width(fstyle,
utf8_text, start_idx,
&startx);
if (res != NSERROR_OK) {
startx = 0;
}
res = guit->layout->width(fstyle,
utf8_text, endtxt_idx,
&endx);
if (res != NSERROR_OK) {
endx = 0;
}
/* is there a trailing space that should be highlighted
* as well? */
if (end_idx > utf8_len) {
endx += space;
}
if (scale != 1.0) {
startx *= scale;
endx *= scale;
}
/* draw any text preceding highlighted portion */
if ((start_idx > 0) &&
(ctx->plot->text(ctx,
&plot_fstyle,
x,
y + (int)(height * 0.75 * scale),
utf8_text,
start_idx) != NSERROR_OK))
return false;
pstyle_fill_hback.fill_colour = fstyle->foreground;
/* highlighted portion */
r.x0 = x + startx;
r.y0 = y;
r.x1 = x + endx;
r.y1 = y + height * scale;
res = ctx->plot->rectangle(ctx, &pstyle_fill_hback, &r);
if (res != NSERROR_OK) {
return false;
}
if (start_idx > 0) {
int px0 = max(x + startx, clip->x0);
int px1 = min(x + endx, clip->x1);
if (px0 < px1) {
r.x0 = px0;
r.y0 = clip->y0;
r.x1 = px1;
r.y1 = clip->y1;
res = ctx->plot->clip(ctx, &r);
if (res != NSERROR_OK) {
return false;
}
clip_changed = true;
} else {
text_visible = false;
}
}
fstyle_hback.background =
pstyle_fill_hback.fill_colour;
fstyle_hback.foreground = colour_to_bw_furthest(
pstyle_fill_hback.fill_colour);
if (text_visible &&
(ctx->plot->text(ctx,
&fstyle_hback,
x,
y + (int)(height * 0.75 * scale),
utf8_text,
endtxt_idx) != NSERROR_OK)) {
return false;
}
/* draw any text succeeding highlighted portion */
if (endtxt_idx < utf8_len) {
int px0 = max(x + endx, clip->x0);
if (px0 < clip->x1) {
r.x0 = px0;
r.y0 = clip->y0;
r.x1 = clip->x1;
r.y1 = clip->y1;
res = ctx->plot->clip(ctx, &r);
if (res != NSERROR_OK) {
return false;
}
clip_changed = true;
res = ctx->plot->text(ctx,
&plot_fstyle,
x,
y + (int)(height * 0.75 * scale),
utf8_text,
utf8_len);
if (res != NSERROR_OK) {
return false;
}
}
}
if (clip_changed &&
(ctx->plot->clip(ctx, clip) != NSERROR_OK)) {
return false;
}
}
}
if (!highlighted) {
res = ctx->plot->text(ctx,
&plot_fstyle,
x,
y + (int) (height * 0.75 * scale),
utf8_text,
utf8_len);
if (res != NSERROR_OK) {
return false;
}
}
return true;
}
/**
* Plot a checkbox.
*
* \param x left coordinate
* \param y top coordinate
* \param width dimensions of checkbox
* \param height dimensions of checkbox
* \param selected the checkbox is selected
* \param ctx current redraw context
* \return true if successful, false otherwise
*/
static bool html_redraw_checkbox(int x, int y, int width, int height,
bool selected, const struct redraw_context *ctx)
{
double z;
nserror res;
struct rect rect;
z = width * 0.15;
if (z == 0) {
z = 1;
}
rect.x0 = x;
rect.y0 = y ;
rect.x1 = x + width;
rect.y1 = y + height;
res = ctx->plot->rectangle(ctx, plot_style_fill_wbasec, &rect);
if (res != NSERROR_OK) {
return false;
}
/* dark line across top */
rect.y1 = y;
res = ctx->plot->line(ctx, plot_style_stroke_darkwbasec, &rect);
if (res != NSERROR_OK) {
return false;
}
/* dark line across left */
rect.x1 = x;
rect.y1 = y + height;
res = ctx->plot->line(ctx, plot_style_stroke_darkwbasec, &rect);
if (res != NSERROR_OK) {
return false;
}
/* light line across right */
rect.x0 = x + width;
rect.x1 = x + width;
res = ctx->plot->line(ctx, plot_style_stroke_lightwbasec, &rect);
if (res != NSERROR_OK) {
return false;
}
/* light line across bottom */
rect.x0 = x;
rect.y0 = y + height;
res = ctx->plot->line(ctx, plot_style_stroke_lightwbasec, &rect);
if (res != NSERROR_OK) {
return false;
}
if (selected) {
if (width < 12 || height < 12) {
/* render a solid box instead of a tick */
rect.x0 = x + z + z;
rect.y0 = y + z + z;
rect.x1 = x + width - z;
rect.y1 = y + height - z;
res = ctx->plot->rectangle(ctx, plot_style_fill_wblobc, &rect);
if (res != NSERROR_OK) {
return false;
}
} else {
/* render a tick, as it'll fit comfortably */
rect.x0 = x + width - z;
rect.y0 = y + z;
rect.x1 = x + (z * 3);
rect.y1 = y + height - z;
res = ctx->plot->line(ctx, plot_style_stroke_wblobc, &rect);
if (res != NSERROR_OK) {
return false;
}
rect.x0 = x + (z * 3);
rect.y0 = y + height - z;
rect.x1 = x + z + z;
rect.y1 = y + (height / 2);
res = ctx->plot->line(ctx, plot_style_stroke_wblobc, &rect);
if (res != NSERROR_OK) {
return false;
}
}
}
return true;
}
/**
* Plot a radio icon.
*
* \param x left coordinate
* \param y top coordinate
* \param width dimensions of radio icon
* \param height dimensions of radio icon
* \param selected the radio icon is selected
* \param ctx current redraw context
* \return true if successful, false otherwise
*/
static bool html_redraw_radio(int x, int y, int width, int height,
bool selected, const struct redraw_context *ctx)
{
nserror res;
/* plot background of radio button */
res = ctx->plot->disc(ctx,
plot_style_fill_wbasec,
x + width * 0.5,
y + height * 0.5,
width * 0.5 - 1);
if (res != NSERROR_OK) {
return false;
}
/* plot dark arc */
res = ctx->plot->arc(ctx,
plot_style_fill_darkwbasec,
x + width * 0.5,
y + height * 0.5,
width * 0.5 - 1,
45,
225);
if (res != NSERROR_OK) {
return false;
}
/* plot light arc */
res = ctx->plot->arc(ctx,
plot_style_fill_lightwbasec,
x + width * 0.5,
y + height * 0.5,
width * 0.5 - 1,
225,
45);
if (res != NSERROR_OK) {
return false;
}
if (selected) {
/* plot selection blob */
res = ctx->plot->disc(ctx,
plot_style_fill_wblobc,
x + width * 0.5,
y + height * 0.5,
width * 0.3 - 1);
if (res != NSERROR_OK) {
return false;
}
}
return true;
}
/**
* Plot a file upload input.
*
* \param x left coordinate
* \param y top coordinate
* \param width dimensions of input
* \param height dimensions of input
* \param box box of input
* \param scale scale for redraw
* \param background_colour current background colour
* \param unit_len_ctx Length conversion context
* \param ctx current redraw context
* \return true if successful, false otherwise
*/
static bool html_redraw_file(int x, int y, int width, int height,
struct box *box, float scale, colour background_colour,
const css_unit_ctx *unit_len_ctx,
const struct redraw_context *ctx)
{
int text_width;
const char *text;
size_t length;
plot_font_style_t fstyle;
nserror res;
font_plot_style_from_css(unit_len_ctx, box->style, &fstyle);
fstyle.background = background_colour;
if (box->gadget->value) {
text = box->gadget->value;
} else {
text = messages_get("Form_Drop");
}
length = strlen(text);
res = guit->layout->width(&fstyle, text, length, &text_width);
if (res != NSERROR_OK) {
return false;
}
text_width *= scale;
if (width < text_width + 8) {
x = x + width - text_width - 4;
} else {
x = x + 4;
}
res = ctx->plot->text(ctx, &fstyle, x, y + height * 0.75, text, length);
if (res != NSERROR_OK) {
return false;
}
return true;
}
/**
* Plot background images.
*
* The reason for the presence of \a background is the backwards compatibility
* mess that is backgrounds on &lt;body&gt;. The background will be drawn relative
* to \a box, using the background information contained within \a background.
*
* \param x coordinate of box
* \param y coordinate of box
* \param box box to draw background image of
* \param scale scale for redraw
* \param clip current clip rectangle
* \param background_colour current background colour
* \param background box containing background details (usually \a box)
* \param unit_len_ctx Length conversion context
* \param ctx current redraw context
* \return true if successful, false otherwise
*/
static bool html_redraw_background(int x, int y, struct box *box, float scale,
const struct rect *clip, colour *background_colour,
struct box *background,
const css_unit_ctx *unit_len_ctx,
const struct redraw_context *ctx)
{
bool repeat_x = false;
bool repeat_y = false;
bool plot_colour = true;
bool plot_content;
bool clip_to_children = false;
struct box *clip_box = box;
int ox = x, oy = y;
int width, height;
css_fixed hpos = 0, vpos = 0;
css_unit hunit = CSS_UNIT_PX, vunit = CSS_UNIT_PX;
struct box *parent;
struct rect r = *clip;
css_color bgcol;
plot_style_t pstyle_fill_bg = {
.fill_type = PLOT_OP_TYPE_SOLID,
.fill_colour = *background_colour,
};
nserror res;
if (ctx->background_images == false)
return true;
plot_content = (background->background != NULL);
if (plot_content) {
if (!box->parent) {
/* Root element, special case:
* background origin calc. is based on margin box */
x -= box->margin[LEFT] * scale;
y -= box->margin[TOP] * scale;
width = box->margin[LEFT] + box->padding[LEFT] +
box->width + box->padding[RIGHT] +
box->margin[RIGHT];
height = box->margin[TOP] + box->padding[TOP] +
box->height + box->padding[BOTTOM] +
box->margin[BOTTOM];
} else {
width = box->padding[LEFT] + box->width +
box->padding[RIGHT];
height = box->padding[TOP] + box->height +
box->padding[BOTTOM];
}
/* handle background-repeat */
switch (css_computed_background_repeat(background->style)) {
case CSS_BACKGROUND_REPEAT_REPEAT:
repeat_x = repeat_y = true;
/* optimisation: only plot the colour if
* bitmap is not opaque */
plot_colour = !content_get_opaque(background->background);
break;
case CSS_BACKGROUND_REPEAT_REPEAT_X:
repeat_x = true;
break;
case CSS_BACKGROUND_REPEAT_REPEAT_Y:
repeat_y = true;
break;
case CSS_BACKGROUND_REPEAT_NO_REPEAT:
break;
default:
break;
}
/* handle background-position */
css_computed_background_position(background->style,
&hpos, &hunit, &vpos, &vunit);
if (hunit == CSS_UNIT_PCT) {
x += (width -
content_get_width(background->background)) *
scale * FIXTOFLT(hpos) / 100.;
} else {
x += (int) (FIXTOFLT(css_unit_len2device_px(
background->style, unit_len_ctx,
hpos, hunit)) * scale);
}
if (vunit == CSS_UNIT_PCT) {
y += (height -
content_get_height(background->background)) *
scale * FIXTOFLT(vpos) / 100.;
} else {
y += (int) (FIXTOFLT(css_unit_len2device_px(
background->style, unit_len_ctx,
vpos, vunit)) * scale);
}
}
/* special case for table rows as their background needs
* to be clipped to all the cells */
if (box->type == BOX_TABLE_ROW) {
css_fixed h = 0, v = 0;
css_unit hu = CSS_UNIT_PX, vu = CSS_UNIT_PX;
for (parent = box->parent;
((parent) && (parent->type != BOX_TABLE));
parent = parent->parent);
assert(parent && (parent->style));
css_computed_border_spacing(parent->style, &h, &hu, &v, &vu);
clip_to_children = (h > 0) || (v > 0);
if (clip_to_children)
clip_box = box->children;
}
for (; clip_box; clip_box = clip_box->next) {
/* clip to child boxes if needed */
if (clip_to_children) {
assert(clip_box->type == BOX_TABLE_CELL);
/* update clip.* to the child cell */
r.x0 = ox + (clip_box->x * scale);
r.y0 = oy + (clip_box->y * scale);
r.x1 = r.x0 + (clip_box->padding[LEFT] +
clip_box->width +
clip_box->padding[RIGHT]) * scale;
r.y1 = r.y0 + (clip_box->padding[TOP] +
clip_box->height +
clip_box->padding[BOTTOM]) * scale;
if (r.x0 < clip->x0) r.x0 = clip->x0;
if (r.y0 < clip->y0) r.y0 = clip->y0;
if (r.x1 > clip->x1) r.x1 = clip->x1;
if (r.y1 > clip->y1) r.y1 = clip->y1;
css_computed_background_color(clip_box->style, &bgcol);
/* <td> attributes override <tr> */
/* if the background content is opaque there
* is no need to plot underneath it.
*/
if ((r.x0 >= r.x1) ||
(r.y0 >= r.y1) ||
(nscss_color_is_transparent(bgcol) == false) ||
((clip_box->background != NULL) &&
content_get_opaque(clip_box->background)))
continue;
}
/* plot the background colour */
css_computed_background_color(background->style, &bgcol);
if (nscss_color_is_transparent(bgcol) == false) {
*background_colour = nscss_color_to_ns(bgcol);
pstyle_fill_bg.fill_colour = *background_colour;
if (plot_colour) {
res = ctx->plot->rectangle(ctx, &pstyle_fill_bg, &r);
if (res != NSERROR_OK) {
return false;
}
}
}
/* and plot the image */
if (plot_content) {
width = content_get_width(background->background);
height = content_get_height(background->background);
/* ensure clip area only as large as required */
if (!repeat_x) {
if (r.x0 < x)
r.x0 = x;
if (r.x1 > x + width * scale)
r.x1 = x + width * scale;
}
if (!repeat_y) {
if (r.y0 < y)
r.y0 = y;
if (r.y1 > y + height * scale)
r.y1 = y + height * scale;
}
/* valid clipping rectangles only */
if ((r.x0 < r.x1) && (r.y0 < r.y1)) {
struct content_redraw_data bg_data;
res = ctx->plot->clip(ctx, &r);
if (res != NSERROR_OK) {
return false;
}
bg_data.x = x;
bg_data.y = y;
bg_data.width = ceilf(width * scale);
bg_data.height = ceilf(height * scale);
bg_data.background_colour = *background_colour;
bg_data.scale = scale;
bg_data.repeat_x = repeat_x;
bg_data.repeat_y = repeat_y;
/* We just continue if redraw fails */
content_redraw(background->background,
&bg_data, &r, ctx);
}
}
/* only <tr> rows being clipped to child boxes loop */
if (!clip_to_children)
return true;
}
return true;
}
/**
* Plot an inline's background and/or background image.
*
* \param x coordinate of box
* \param y coordinate of box
* \param box BOX_INLINE which created the background
* \param scale scale for redraw
* \param clip coordinates of clip rectangle
* \param b coordinates of border edge rectangle
* \param first true if this is the first rectangle associated with the inline
* \param last true if this is the last rectangle associated with the inline
* \param background_colour updated to current background colour if plotted
* \param unit_len_ctx Length conversion context
* \param ctx current redraw context
* \return true if successful, false otherwise
*/
static bool html_redraw_inline_background(int x, int y, struct box *box,
float scale, const struct rect *clip, struct rect b,
bool first, bool last, colour *background_colour,
const css_unit_ctx *unit_len_ctx,
const struct redraw_context *ctx)
{
struct rect r = *clip;
bool repeat_x = false;
bool repeat_y = false;
bool plot_colour = true;
bool plot_content;
css_fixed hpos = 0, vpos = 0;
css_unit hunit = CSS_UNIT_PX, vunit = CSS_UNIT_PX;
css_color bgcol;
plot_style_t pstyle_fill_bg = {
.fill_type = PLOT_OP_TYPE_SOLID,
.fill_colour = *background_colour,
};
nserror res;
plot_content = (box->background != NULL);
if (html_redraw_printing && nsoption_bool(remove_backgrounds))
return true;
if (plot_content) {
/* handle background-repeat */
switch (css_computed_background_repeat(box->style)) {
case CSS_BACKGROUND_REPEAT_REPEAT:
repeat_x = repeat_y = true;
/* optimisation: only plot the colour if
* bitmap is not opaque
*/
plot_colour = !content_get_opaque(box->background);
break;
case CSS_BACKGROUND_REPEAT_REPEAT_X:
repeat_x = true;
break;
case CSS_BACKGROUND_REPEAT_REPEAT_Y:
repeat_y = true;
break;
case CSS_BACKGROUND_REPEAT_NO_REPEAT:
break;
default:
break;
}
/* handle background-position */
css_computed_background_position(box->style,
&hpos, &hunit, &vpos, &vunit);
if (hunit == CSS_UNIT_PCT) {
x += (b.x1 - b.x0 -
content_get_width(box->background) *
scale) * FIXTOFLT(hpos) / 100.;
if (!repeat_x && ((hpos < 2 && !first) ||
(hpos > 98 && !last))){
plot_content = false;
}
} else {
x += (int) (FIXTOFLT(css_unit_len2device_px(
box->style, unit_len_ctx,
hpos, hunit)) * scale);
}
if (vunit == CSS_UNIT_PCT) {
y += (b.y1 - b.y0 -
content_get_height(box->background) *
scale) * FIXTOFLT(vpos) / 100.;
} else {
y += (int) (FIXTOFLT(css_unit_len2device_px(
box->style, unit_len_ctx,
vpos, vunit)) * scale);
}
}
/* plot the background colour */
css_computed_background_color(box->style, &bgcol);
if (nscss_color_is_transparent(bgcol) == false) {
*background_colour = nscss_color_to_ns(bgcol);
pstyle_fill_bg.fill_colour = *background_colour;
if (plot_colour) {
res = ctx->plot->rectangle(ctx, &pstyle_fill_bg, &r);
if (res != NSERROR_OK) {
return false;
}
}
}
/* and plot the image */
if (plot_content) {
int width = content_get_width(box->background);
int height = content_get_height(box->background);
if (!repeat_x) {
if (r.x0 < x)
r.x0 = x;
if (r.x1 > x + width * scale)
r.x1 = x + width * scale;
}
if (!repeat_y) {
if (r.y0 < y)
r.y0 = y;
if (r.y1 > y + height * scale)
r.y1 = y + height * scale;
}
/* valid clipping rectangles only */
if ((r.x0 < r.x1) && (r.y0 < r.y1)) {
struct content_redraw_data bg_data;
res = ctx->plot->clip(ctx, &r);
if (res != NSERROR_OK) {
return false;
}
bg_data.x = x;
bg_data.y = y;
bg_data.width = ceilf(width * scale);
bg_data.height = ceilf(height * scale);
bg_data.background_colour = *background_colour;
bg_data.scale = scale;
bg_data.repeat_x = repeat_x;
bg_data.repeat_y = repeat_y;
/* We just continue if redraw fails */
content_redraw(box->background, &bg_data, &r, ctx);
}
}
return true;
}
/**
* Plot text decoration for an inline box.
*
* \param box box to plot decorations for, of type BOX_INLINE
* \param x x coordinate of parent of box
* \param y y coordinate of parent of box
* \param scale scale for redraw
* \param colour colour for decorations
* \param ratio position of line as a ratio of line height
* \param ctx current redraw context
* \return true if successful, false otherwise
*/
static bool
html_redraw_text_decoration_inline(struct box *box,
int x, int y,
float scale,
colour colour,
float ratio,
const struct redraw_context *ctx)
{
struct box *c;
plot_style_t plot_style_box = {
.stroke_type = PLOT_OP_TYPE_SOLID,
.stroke_colour = colour,
};
nserror res;
struct rect rect;
for (c = box->next;
c && c != box->inline_end;
c = c->next) {
if (c->type != BOX_TEXT) {
continue;
}
rect.x0 = (x + c->x) * scale;
rect.y0 = (y + c->y + c->height * ratio) * scale;
rect.x1 = (x + c->x + c->width) * scale;
rect.y1 = (y + c->y + c->height * ratio) * scale;
res = ctx->plot->line(ctx, &plot_style_box, &rect);
if (res != NSERROR_OK) {
return false;
}
}
return true;
}
/**
* Plot text decoration for an non-inline box.
*
* \param box box to plot decorations for, of type other than BOX_INLINE
* \param x x coordinate of box
* \param y y coordinate of box
* \param scale scale for redraw
* \param colour colour for decorations
* \param ratio position of line as a ratio of line height
* \param ctx current redraw context
* \return true if successful, false otherwise
*/
static bool
html_redraw_text_decoration_block(struct box *box,
int x, int y,
float scale,
colour colour,
float ratio,
const struct redraw_context *ctx)
{
struct box *c;
plot_style_t plot_style_box = {
.stroke_type = PLOT_OP_TYPE_SOLID,
.stroke_colour = colour,
};
nserror res;
struct rect rect;
/* draw through text descendants */
for (c = box->children; c; c = c->next) {
if (c->type == BOX_TEXT) {
rect.x0 = (x + c->x) * scale;
rect.y0 = (y + c->y + c->height * ratio) * scale;
rect.x1 = (x + c->x + c->width) * scale;
rect.y1 = (y + c->y + c->height * ratio) * scale;
res = ctx->plot->line(ctx, &plot_style_box, &rect);
if (res != NSERROR_OK) {
return false;
}
} else if ((c->type == BOX_INLINE_CONTAINER) || (c->type == BOX_BLOCK)) {
if (!html_redraw_text_decoration_block(c,
x + c->x, y + c->y,
scale, colour, ratio, ctx))
return false;
}
}
return true;
}
/**
* Plot text decoration for a box.
*
* \param box box to plot decorations for
* \param x_parent x coordinate of parent of box
* \param y_parent y coordinate of parent of box
* \param scale scale for redraw
* \param background_colour current background colour
* \param ctx current redraw context
* \return true if successful, false otherwise
*/
static bool html_redraw_text_decoration(struct box *box,
int x_parent, int y_parent, float scale,
colour background_colour, const struct redraw_context *ctx)
{
static const enum css_text_decoration_e decoration[] = {
CSS_TEXT_DECORATION_UNDERLINE, CSS_TEXT_DECORATION_OVERLINE,
CSS_TEXT_DECORATION_LINE_THROUGH };
static const float line_ratio[] = { 0.9, 0.1, 0.5 };
colour fgcol;
unsigned int i;
css_color col;
css_computed_color(box->style, &col);
fgcol = nscss_color_to_ns(col);
/* antialias colour for under/overline */
if (html_redraw_printing == false)
fgcol = blend_colour(background_colour, fgcol);
if (box->type == BOX_INLINE) {
if (!box->inline_end)
return true;
for (i = 0; i != NOF_ELEMENTS(decoration); i++)
if (css_computed_text_decoration(box->style) &
decoration[i])
if (!html_redraw_text_decoration_inline(box,
x_parent, y_parent, scale,
fgcol, line_ratio[i], ctx))
return false;
} else {
for (i = 0; i != NOF_ELEMENTS(decoration); i++)
if (css_computed_text_decoration(box->style) &
decoration[i])
if (!html_redraw_text_decoration_block(box,
x_parent + box->x,
y_parent + box->y,
scale,
fgcol, line_ratio[i], ctx))
return false;
}
return true;
}
/**
* Redraw the text content of a box, possibly partially highlighted
* because the text has been selected, or matches a search operation.
*
* \param html The html content to redraw text within.
* \param box box with text content
* \param x x co-ord of box
* \param y y co-ord of box
* \param clip current clip rectangle
* \param scale current scale setting (1.0 = 100%)
* \param current_background_color
* \param ctx current redraw context
* \return true iff successful and redraw should proceed
*/
static bool html_redraw_text_box(const html_content *html, struct box *box,
int x, int y, const struct rect *clip, float scale,
colour current_background_color,
const struct redraw_context *ctx)
{
bool excluded = (box->object != NULL);
plot_font_style_t fstyle;
font_plot_style_from_css(&html->unit_len_ctx, box->style, &fstyle);
fstyle.background = current_background_color;
if (!text_redraw(box->text,
box->length,
box->byte_offset,
box->space,
&fstyle,
x, y,
clip,
box->height,
scale,
excluded,
(struct content *)html,
html->sel,
ctx))
return false;
return true;
}
bool html_redraw_box(const html_content *html, struct box *box,
int x_parent, int y_parent,
const struct rect *clip, float scale,
colour current_background_color,
const struct redraw_context *ctx);
/**
* Draw the various children of a box.
*
* \param html html content
* \param box box to draw children of
* \param x_parent coordinate of parent box
* \param y_parent coordinate of parent box
* \param clip clip rectangle
* \param scale scale for redraw
* \param current_background_color background colour under this box
* \param ctx current redraw context
* \return true if successful, false otherwise
*/
static bool html_redraw_box_children(const html_content *html, struct box *box,
int x_parent, int y_parent,
const struct rect *clip, float scale,
colour current_background_color,
const struct redraw_context *ctx)
{
struct box *c;
for (c = box->children; c; c = c->next) {
if (c->type != BOX_FLOAT_LEFT && c->type != BOX_FLOAT_RIGHT)
if (!html_redraw_box(html, c,
x_parent + box->x -
scrollbar_get_offset(box->scroll_x),
y_parent + box->y -
scrollbar_get_offset(box->scroll_y),
clip, scale, current_background_color,
ctx))
return false;
}
for (c = box->float_children; c; c = c->next_float)
if (!html_redraw_box(html, c,
x_parent + box->x -
scrollbar_get_offset(box->scroll_x),
y_parent + box->y -
scrollbar_get_offset(box->scroll_y),
clip, scale, current_background_color,
ctx))
return false;
return true;
}
/**
* Recursively draw a box.
*
* \param html html content
* \param box box to draw
* \param x_parent coordinate of parent box
* \param y_parent coordinate of parent box
* \param clip clip rectangle
* \param scale scale for redraw
* \param current_background_color background colour under this box
* \param ctx current redraw context
* \return true if successful, false otherwise
*
* x, y, clip_[xy][01] are in target coordinates.
*/
bool html_redraw_box(const html_content *html, struct box *box,
int x_parent, int y_parent,
const struct rect *clip, const float scale,
colour current_background_color,
const struct redraw_context *ctx)
{
const struct plotter_table *plot = ctx->plot;
int x, y;
int width, height;
int padding_left, padding_top, padding_width, padding_height;
int border_left, border_top, border_right, border_bottom;
struct rect r;
struct rect rect;
int x_scrolled, y_scrolled;
struct box *bg_box = NULL;
css_computed_clip_rect css_rect;
enum css_overflow_e overflow_x = CSS_OVERFLOW_VISIBLE;
enum css_overflow_e overflow_y = CSS_OVERFLOW_VISIBLE;
dom_exception exc;
dom_html_element_type tag_type;
if (html_redraw_printing && (box->flags & PRINTED))
return true;
if (box->style != NULL) {
overflow_x = css_computed_overflow_x(box->style);
overflow_y = css_computed_overflow_y(box->style);
}
/* avoid trivial FP maths */
if (scale == 1.0) {
x = x_parent + box->x;
y = y_parent + box->y;
width = box->width;
height = box->height;
padding_left = box->padding[LEFT];
padding_top = box->padding[TOP];
padding_width = padding_left + box->width + box->padding[RIGHT];
padding_height = padding_top + box->height +
box->padding[BOTTOM];
border_left = box->border[LEFT].width;
border_top = box->border[TOP].width;
border_right = box->border[RIGHT].width;
border_bottom = box->border[BOTTOM].width;
} else {
x = (x_parent + box->x) * scale;
y = (y_parent + box->y) * scale;
width = box->width * scale;
height = box->height * scale;
/* left and top padding values are normally zero,
* so avoid trivial FP maths */
padding_left = box->padding[LEFT] ? box->padding[LEFT] * scale
: 0;
padding_top = box->padding[TOP] ? box->padding[TOP] * scale
: 0;
padding_width = (box->padding[LEFT] + box->width +
box->padding[RIGHT]) * scale;
padding_height = (box->padding[TOP] + box->height +
box->padding[BOTTOM]) * scale;
border_left = box->border[LEFT].width * scale;
border_top = box->border[TOP].width * scale;
border_right = box->border[RIGHT].width * scale;
border_bottom = box->border[BOTTOM].width * scale;
}
/* calculate rectangle covering this box and descendants */
if (box->style && overflow_x != CSS_OVERFLOW_VISIBLE &&
box->parent != NULL) {
/* box contents clipped to box size */
r.x0 = x - border_left;
r.x1 = x + padding_width + border_right;
} else {
/* box contents can hang out of the box; use descendant box */
if (scale == 1.0) {
r.x0 = x + box->descendant_x0;
r.x1 = x + box->descendant_x1 + 1;
} else {
r.x0 = x + box->descendant_x0 * scale;
r.x1 = x + box->descendant_x1 * scale + 1;
}
if (!box->parent) {
/* root element */
int margin_left, margin_right;
if (scale == 1.0) {
margin_left = box->margin[LEFT];
margin_right = box->margin[RIGHT];
} else {
margin_left = box->margin[LEFT] * scale;
margin_right = box->margin[RIGHT] * scale;
}
r.x0 = x - border_left - margin_left < r.x0 ?
x - border_left - margin_left : r.x0;
r.x1 = x + padding_width + border_right +
margin_right > r.x1 ?
x + padding_width + border_right +
margin_right : r.x1;
}
}
/* calculate rectangle covering this box and descendants */
if (box->style && overflow_y != CSS_OVERFLOW_VISIBLE &&
box->parent != NULL) {
/* box contents clipped to box size */
r.y0 = y - border_top;
r.y1 = y + padding_height + border_bottom;
} else {
/* box contents can hang out of the box; use descendant box */
if (scale == 1.0) {
r.y0 = y + box->descendant_y0;
r.y1 = y + box->descendant_y1 + 1;
} else {
r.y0 = y + box->descendant_y0 * scale;
r.y1 = y + box->descendant_y1 * scale + 1;
}
if (!box->parent) {
/* root element */
int margin_top, margin_bottom;
if (scale == 1.0) {
margin_top = box->margin[TOP];
margin_bottom = box->margin[BOTTOM];
} else {
margin_top = box->margin[TOP] * scale;
margin_bottom = box->margin[BOTTOM] * scale;
}
r.y0 = y - border_top - margin_top < r.y0 ?
y - border_top - margin_top : r.y0;
r.y1 = y + padding_height + border_bottom +
margin_bottom > r.y1 ?
y + padding_height + border_bottom +
margin_bottom : r.y1;
}
}
/* return if the rectangle is completely outside the clip rectangle */
if (clip->y1 < r.y0 || r.y1 < clip->y0 ||
clip->x1 < r.x0 || r.x1 < clip->x0)
return true;
/*if the rectangle is under the page bottom but it can fit in a page,
don't print it now*/
if (html_redraw_printing) {
if (r.y1 > html_redraw_printing_border) {
if (r.y1 - r.y0 <= html_redraw_printing_border &&
(box->type == BOX_TEXT ||
box->type == BOX_TABLE_CELL
|| box->object || box->gadget)) {
/*remember the highest of all points from the
not printed elements*/
if (r.y0 < html_redraw_printing_top_cropped)
html_redraw_printing_top_cropped = r.y0;
return true;
}
}
else box->flags |= PRINTED; /*it won't be printed anymore*/
}
/* if visibility is hidden render children only */
if (box->style && css_computed_visibility(box->style) ==
CSS_VISIBILITY_HIDDEN) {
if ((ctx->plot->group_start) &&
(ctx->plot->group_start(ctx, "hidden box") != NSERROR_OK))
return false;
if (!html_redraw_box_children(html, box, x_parent, y_parent,
&r, scale, current_background_color, ctx))
return false;
return ((!ctx->plot->group_end) || (ctx->plot->group_end(ctx) == NSERROR_OK));
}
if ((ctx->plot->group_start) &&
(ctx->plot->group_start(ctx,"vis box") != NSERROR_OK)) {
return false;
}
if (box->style != NULL &&
css_computed_position(box->style) ==
CSS_POSITION_ABSOLUTE &&
css_computed_clip(box->style, &css_rect) ==
CSS_CLIP_RECT) {
/* We have an absolutly positioned box with a clip rect */
if (css_rect.left_auto == false)
r.x0 = x - border_left + FIXTOINT(css_unit_len2device_px(
box->style, &html->unit_len_ctx,
css_rect.left, css_rect.lunit));
if (css_rect.top_auto == false)
r.y0 = y - border_top + FIXTOINT(css_unit_len2device_px(
box->style, &html->unit_len_ctx,
css_rect.top, css_rect.tunit));
if (css_rect.right_auto == false)
r.x1 = x - border_left + FIXTOINT(css_unit_len2device_px(
box->style, &html->unit_len_ctx,
css_rect.right, css_rect.runit));
if (css_rect.bottom_auto == false)
r.y1 = y - border_top + FIXTOINT(css_unit_len2device_px(
box->style, &html->unit_len_ctx,
css_rect.bottom, css_rect.bunit));
/* find intersection of clip rectangle and box */
if (r.x0 < clip->x0) r.x0 = clip->x0;
if (r.y0 < clip->y0) r.y0 = clip->y0;
if (clip->x1 < r.x1) r.x1 = clip->x1;
if (clip->y1 < r.y1) r.y1 = clip->y1;
/* Nothing to do for invalid rectangles */
if (r.x0 >= r.x1 || r.y0 >= r.y1)
/* not an error */
return ((!ctx->plot->group_end) ||
(ctx->plot->group_end(ctx) == NSERROR_OK));
/* clip to it */
if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
return false;
} else if (box->type == BOX_BLOCK || box->type == BOX_INLINE_BLOCK ||
box->type == BOX_TABLE_CELL || box->object) {
/* find intersection of clip rectangle and box */
if (r.x0 < clip->x0) r.x0 = clip->x0;
if (r.y0 < clip->y0) r.y0 = clip->y0;
if (clip->x1 < r.x1) r.x1 = clip->x1;
if (clip->y1 < r.y1) r.y1 = clip->y1;
/* no point trying to draw 0-width/height boxes */
if (r.x0 == r.x1 || r.y0 == r.y1)
/* not an error */
return ((!ctx->plot->group_end) ||
(ctx->plot->group_end(ctx) == NSERROR_OK));
/* clip to it */
if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
return false;
} else {
/* clip box is fine, clip to it */
r = *clip;
if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
return false;
}
/* background colour and image for block level content and replaced
* inlines */
bg_box = html_redraw_find_bg_box(box);
/* bg_box == NULL implies that this box should not have
* its background rendered. Otherwise filter out linebreaks,
* optimize away non-differing inlines, only plot background
* for BOX_TEXT it's in an inline */
if (bg_box && bg_box->type != BOX_BR &&
bg_box->type != BOX_TEXT &&
bg_box->type != BOX_INLINE_END &&
(bg_box->type != BOX_INLINE || bg_box->object ||
bg_box->flags & IFRAME || box->flags & REPLACE_DIM ||
(bg_box->gadget != NULL &&
(bg_box->gadget->type == GADGET_TEXTAREA ||
bg_box->gadget->type == GADGET_TEXTBOX ||
bg_box->gadget->type == GADGET_PASSWORD)))) {
/* find intersection of clip box and border edge */
struct rect p;
p.x0 = x - border_left < r.x0 ? r.x0 : x - border_left;
p.y0 = y - border_top < r.y0 ? r.y0 : y - border_top;
p.x1 = x + padding_width + border_right < r.x1 ?
x + padding_width + border_right : r.x1;
p.y1 = y + padding_height + border_bottom < r.y1 ?
y + padding_height + border_bottom : r.y1;
if (!box->parent) {
/* Root element, special case:
* background covers margins too */
int m_left, m_top, m_right, m_bottom;
if (scale == 1.0) {
m_left = box->margin[LEFT];
m_top = box->margin[TOP];
m_right = box->margin[RIGHT];
m_bottom = box->margin[BOTTOM];
} else {
m_left = box->margin[LEFT] * scale;
m_top = box->margin[TOP] * scale;
m_right = box->margin[RIGHT] * scale;
m_bottom = box->margin[BOTTOM] * scale;
}
p.x0 = p.x0 - m_left < r.x0 ? r.x0 : p.x0 - m_left;
p.y0 = p.y0 - m_top < r.y0 ? r.y0 : p.y0 - m_top;
p.x1 = p.x1 + m_right < r.x1 ? p.x1 + m_right : r.x1;
p.y1 = p.y1 + m_bottom < r.y1 ? p.y1 + m_bottom : r.y1;
}
/* valid clipping rectangles only */
if ((p.x0 < p.x1) && (p.y0 < p.y1)) {
/* plot background */
if (!html_redraw_background(x, y, box, scale, &p,
&current_background_color, bg_box,
&html->unit_len_ctx, ctx))
return false;
/* restore previous graphics window */
if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
return false;
}
}
/* borders for block level content and replaced inlines */
if (box->style &&
box->type != BOX_TEXT &&
box->type != BOX_INLINE_END &&
(box->type != BOX_INLINE || box->object ||
box->flags & IFRAME || box->flags & REPLACE_DIM ||
(box->gadget != NULL &&
(box->gadget->type == GADGET_TEXTAREA ||
box->gadget->type == GADGET_TEXTBOX ||
box->gadget->type == GADGET_PASSWORD))) &&
(border_top || border_right || border_bottom || border_left)) {
if (!html_redraw_borders(box, x_parent, y_parent,
padding_width, padding_height, &r,
scale, ctx))
return false;
}
/* backgrounds and borders for non-replaced inlines */
if (box->style && box->type == BOX_INLINE && box->inline_end &&
(html_redraw_box_has_background(box) ||
border_top || border_right ||
border_bottom || border_left)) {
/* inline backgrounds and borders span other boxes and may
* wrap onto separate lines */
struct box *ib;
struct rect b; /* border edge rectangle */
struct rect p; /* clipped rect */
bool first = true;
int ib_x;
int ib_y = y;
int ib_p_width;
int ib_b_left, ib_b_right;
b.x0 = x - border_left;
b.x1 = x + padding_width + border_right;
b.y0 = y - border_top;
b.y1 = y + padding_height + border_bottom;
p.x0 = b.x0 < r.x0 ? r.x0 : b.x0;
p.x1 = b.x1 < r.x1 ? b.x1 : r.x1;
p.y0 = b.y0 < r.y0 ? r.y0 : b.y0;
p.y1 = b.y1 < r.y1 ? b.y1 : r.y1;
for (ib = box; ib; ib = ib->next) {
/* to get extents of rectangle(s) associated with
* inline, cycle though all boxes in inline, skipping
* over floats */
if (ib->type == BOX_FLOAT_LEFT ||
ib->type == BOX_FLOAT_RIGHT)
continue;
if (scale == 1.0) {
ib_x = x_parent + ib->x;
ib_y = y_parent + ib->y;
ib_p_width = ib->padding[LEFT] + ib->width +
ib->padding[RIGHT];
ib_b_left = ib->border[LEFT].width;
ib_b_right = ib->border[RIGHT].width;
} else {
ib_x = (x_parent + ib->x) * scale;
ib_y = (y_parent + ib->y) * scale;
ib_p_width = (ib->padding[LEFT] + ib->width +
ib->padding[RIGHT]) * scale;
ib_b_left = ib->border[LEFT].width * scale;
ib_b_right = ib->border[RIGHT].width * scale;
}
if ((ib->flags & NEW_LINE) && ib != box) {
/* inline element has wrapped, plot background
* and borders */
if (!html_redraw_inline_background(
x, y, box, scale, &p, b,
first, false,
&current_background_color,
&html->unit_len_ctx, ctx))
return false;
/* restore previous graphics window */
if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
return false;
if (!html_redraw_inline_borders(box, b, &r,
scale, first, false, ctx))
return false;
/* reset coords */
b.x0 = ib_x - ib_b_left;
b.y0 = ib_y - border_top - padding_top;
b.y1 = ib_y + padding_height - padding_top +
border_bottom;
p.x0 = b.x0 < r.x0 ? r.x0 : b.x0;
p.y0 = b.y0 < r.y0 ? r.y0 : b.y0;
p.y1 = b.y1 < r.y1 ? b.y1 : r.y1;
first = false;
}
/* increase width for current box */
b.x1 = ib_x + ib_p_width + ib_b_right;
p.x1 = b.x1 < r.x1 ? b.x1 : r.x1;
if (ib == box->inline_end)
/* reached end of BOX_INLINE span */
break;
}
/* plot background and borders for last rectangle of
* the inline */
if (!html_redraw_inline_background(x, ib_y, box, scale, &p, b,
first, true, &current_background_color,
&html->unit_len_ctx, ctx))
return false;
/* restore previous graphics window */
if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
return false;
if (!html_redraw_inline_borders(box, b, &r, scale, first, true,
ctx))
return false;
}
/* Debug outlines */
if (html_redraw_debug) {
int margin_left, margin_right;
int margin_top, margin_bottom;
if (scale == 1.0) {
/* avoid trivial fp maths */
margin_left = box->margin[LEFT];
margin_top = box->margin[TOP];
margin_right = box->margin[RIGHT];
margin_bottom = box->margin[BOTTOM];
} else {
margin_left = box->margin[LEFT] * scale;
margin_top = box->margin[TOP] * scale;
margin_right = box->margin[RIGHT] * scale;
margin_bottom = box->margin[BOTTOM] * scale;
}
/* Content edge -- blue */
rect.x0 = x + padding_left;
rect.y0 = y + padding_top;
rect.x1 = x + padding_left + width;
rect.y1 = y + padding_top + height;
if (ctx->plot->rectangle(ctx, plot_style_content_edge, &rect) != NSERROR_OK)
return false;
/* Padding edge -- red */
rect.x0 = x;
rect.y0 = y;
rect.x1 = x + padding_width;
rect.y1 = y + padding_height;
if (ctx->plot->rectangle(ctx, plot_style_padding_edge, &rect) != NSERROR_OK)
return false;
/* Margin edge -- yellow */
rect.x0 = x - border_left - margin_left;
rect.y0 = y - border_top - margin_top;
rect.x1 = x + padding_width + border_right + margin_right;
rect.y1 = y + padding_height + border_bottom + margin_bottom;
if (ctx->plot->rectangle(ctx, plot_style_margin_edge, &rect) != NSERROR_OK)
return false;
}
/* clip to the padding edge for objects, or boxes with overflow hidden
* or scroll, unless it's the root element */
if (box->parent != NULL) {
bool need_clip = false;
if (box->object || box->flags & IFRAME ||
(overflow_x != CSS_OVERFLOW_VISIBLE &&
overflow_y != CSS_OVERFLOW_VISIBLE)) {
r.x0 = x;
r.y0 = y;
r.x1 = x + padding_width;
r.y1 = y + padding_height;
if (r.x0 < clip->x0) r.x0 = clip->x0;
if (r.y0 < clip->y0) r.y0 = clip->y0;
if (clip->x1 < r.x1) r.x1 = clip->x1;
if (clip->y1 < r.y1) r.y1 = clip->y1;
if (r.x1 <= r.x0 || r.y1 <= r.y0) {
return (!ctx->plot->group_end ||
(ctx->plot->group_end(ctx) == NSERROR_OK));
}
need_clip = true;
} else if (overflow_x != CSS_OVERFLOW_VISIBLE) {
r.x0 = x;
r.y0 = clip->y0;
r.x1 = x + padding_width;
r.y1 = clip->y1;
if (r.x0 < clip->x0) r.x0 = clip->x0;
if (clip->x1 < r.x1) r.x1 = clip->x1;
if (r.x1 <= r.x0) {
return (!ctx->plot->group_end ||
(ctx->plot->group_end(ctx) == NSERROR_OK));
}
need_clip = true;
} else if (overflow_y != CSS_OVERFLOW_VISIBLE) {
r.x0 = clip->x0;
r.y0 = y;
r.x1 = clip->x1;
r.y1 = y + padding_height;
if (r.y0 < clip->y0) r.y0 = clip->y0;
if (clip->y1 < r.y1) r.y1 = clip->y1;
if (r.y1 <= r.y0) {
return (!ctx->plot->group_end ||
(ctx->plot->group_end(ctx) == NSERROR_OK));
}
need_clip = true;
}
if (need_clip &&
(box->type == BOX_BLOCK ||
box->type == BOX_INLINE_BLOCK ||
box->type == BOX_TABLE_CELL || box->object)) {
if (ctx->plot->clip(ctx, &r) != NSERROR_OK)
return false;
}
}
/* text decoration */
if ((box->type != BOX_TEXT) &&
box->style &&
css_computed_text_decoration(box->style) != CSS_TEXT_DECORATION_NONE) {
if (!html_redraw_text_decoration(box, x_parent, y_parent,
scale, current_background_color, ctx))
return false;
}
if (box->node != NULL) {
exc = dom_html_element_get_tag_type(box->node, &tag_type);
if (exc != DOM_NO_ERR) {
tag_type = DOM_HTML_ELEMENT_TYPE__UNKNOWN;
}
} else {
tag_type = DOM_HTML_ELEMENT_TYPE__UNKNOWN;
}
if (box->object && width != 0 && height != 0) {
struct content_redraw_data obj_data;
x_scrolled = x - scrollbar_get_offset(box->scroll_x) * scale;
y_scrolled = y - scrollbar_get_offset(box->scroll_y) * scale;
obj_data.x = x_scrolled + padding_left;
obj_data.y = y_scrolled + padding_top;
obj_data.width = width;
obj_data.height = height;
obj_data.background_colour = current_background_color;
obj_data.scale = scale;
obj_data.repeat_x = false;
obj_data.repeat_y = false;
if (content_get_type(box->object) == CONTENT_HTML) {
obj_data.x /= scale;
obj_data.y /= scale;
}
if (!content_redraw(box->object, &obj_data, &r, ctx)) {
/* Show image fail */
/* Unicode (U+FFFC) 'OBJECT REPLACEMENT CHARACTER' */
const char *obj = "\xef\xbf\xbc";
int obj_width;
int obj_x = x + padding_left;
nserror res;
rect.x0 = x + padding_left;
rect.y0 = y + padding_top;
rect.x1 = x + padding_left + width - 1;
rect.y1 = y + padding_top + height - 1;
res = ctx->plot->rectangle(ctx, plot_style_broken_object, &rect);
if (res != NSERROR_OK) {
return false;
}
res = guit->layout->width(plot_fstyle_broken_object,
obj,
sizeof(obj) - 1,
&obj_width);
if (res != NSERROR_OK) {
obj_x += 1;
} else {
obj_x += width / 2 - obj_width / 2;
}
if (ctx->plot->text(ctx,
plot_fstyle_broken_object,
obj_x, y + padding_top + (int)(height * 0.75),
obj, sizeof(obj) - 1) != NSERROR_OK)
return false;
}
} else if (tag_type == DOM_HTML_ELEMENT_TYPE_CANVAS &&
box->node != NULL &&
box->flags & REPLACE_DIM) {
/* Canvas to draw */
struct bitmap *bitmap = NULL;
exc = dom_node_get_user_data(box->node,
corestring_dom___ns_key_canvas_node_data,
&bitmap);
if (exc != DOM_NO_ERR) {
bitmap = NULL;
}
if (bitmap != NULL &&
ctx->plot->bitmap(ctx, bitmap, x + padding_left, y + padding_top,
width, height, current_background_color,
BITMAPF_NONE) != NSERROR_OK)
return false;
} else if (box->iframe) {
/* Offset is passed to browser window redraw unscaled */
browser_window_redraw(box->iframe,
x + padding_left,
y + padding_top, &r, ctx);
} else if (box->gadget && box->gadget->type == GADGET_CHECKBOX) {
if (!html_redraw_checkbox(x + padding_left, y + padding_top,
width, height, box->gadget->selected, ctx))
return false;
} else if (box->gadget && box->gadget->type == GADGET_RADIO) {
if (!html_redraw_radio(x + padding_left, y + padding_top,
width, height, box->gadget->selected, ctx))
return false;
} else if (box->gadget && box->gadget->type == GADGET_FILE) {
if (!html_redraw_file(x + padding_left, y + padding_top,
width, height, box, scale,
current_background_color, &html->unit_len_ctx, ctx))
return false;
} else if (box->gadget &&
(box->gadget->type == GADGET_TEXTAREA ||
box->gadget->type == GADGET_PASSWORD ||
box->gadget->type == GADGET_TEXTBOX)) {
textarea_redraw(box->gadget->data.text.ta, x, y,
current_background_color, scale, &r, ctx);
} else if (box->text) {
if (!html_redraw_text_box(html, box, x, y, &r, scale,
current_background_color, ctx))
return false;
} else {
if (!html_redraw_box_children(html, box, x_parent, y_parent, &r,
scale, current_background_color, ctx))
return false;
}
if (box->type == BOX_BLOCK || box->type == BOX_INLINE_BLOCK ||
box->type == BOX_TABLE_CELL || box->type == BOX_INLINE)
if (ctx->plot->clip(ctx, clip) != NSERROR_OK)
return false;
/* list marker */
if (box->list_marker) {
if (!html_redraw_box(html, box->list_marker,
x_parent + box->x -
scrollbar_get_offset(box->scroll_x),
y_parent + box->y -
scrollbar_get_offset(box->scroll_y),
clip, scale, current_background_color, ctx))
return false;
}
/* scrollbars */
if (((box->style && box->type != BOX_BR &&
box->type != BOX_TABLE && box->type != BOX_INLINE &&
(box->gadget == NULL || box->gadget->type != GADGET_TEXTAREA) &&
(overflow_x == CSS_OVERFLOW_SCROLL ||
overflow_x == CSS_OVERFLOW_AUTO ||
overflow_y == CSS_OVERFLOW_SCROLL ||
overflow_y == CSS_OVERFLOW_AUTO)) ||
(box->object && content_get_type(box->object) ==
CONTENT_HTML)) && box->parent != NULL) {
nserror res;
bool has_x_scroll = (overflow_x == CSS_OVERFLOW_SCROLL);
bool has_y_scroll = (overflow_y == CSS_OVERFLOW_SCROLL);
has_x_scroll |= (overflow_x == CSS_OVERFLOW_AUTO) &&
box_hscrollbar_present(box);
has_y_scroll |= (overflow_y == CSS_OVERFLOW_AUTO) &&
box_vscrollbar_present(box);
res = box_handle_scrollbars((struct content *)html,
box, has_x_scroll, has_y_scroll);
if (res != NSERROR_OK) {
NSLOG(netsurf, INFO, "%s", messages_get_errorcode(res));
return false;
}
if (box->scroll_x != NULL)
scrollbar_redraw(box->scroll_x,
x_parent + box->x,
y_parent + box->y + box->padding[TOP] +
box->height + box->padding[BOTTOM] -
SCROLLBAR_WIDTH, clip, scale, ctx);
if (box->scroll_y != NULL)
scrollbar_redraw(box->scroll_y,
x_parent + box->x + box->padding[LEFT] +
box->width + box->padding[RIGHT] -
SCROLLBAR_WIDTH,
y_parent + box->y, clip, scale, ctx);
}
if (box->type == BOX_BLOCK || box->type == BOX_INLINE_BLOCK ||
box->type == BOX_TABLE_CELL || box->type == BOX_INLINE) {
if (ctx->plot->clip(ctx, clip) != NSERROR_OK)
return false;
}
return ((!plot->group_end) || (ctx->plot->group_end(ctx) == NSERROR_OK));
}
/**
* Draw a CONTENT_HTML using the current set of plotters (plot).
*
* \param c content of type CONTENT_HTML
* \param data redraw data for this content redraw
* \param clip current clip region
* \param ctx current redraw context
* \return true if successful, false otherwise
*
* x, y, clip_[xy][01] are in target coordinates.
*/
bool html_redraw(struct content *c, struct content_redraw_data *data,
const struct rect *clip, const struct redraw_context *ctx)
{
html_content *html = (html_content *) c;
struct box *box;
bool result = true;
bool select, select_only;
plot_style_t pstyle_fill_bg = {
.fill_type = PLOT_OP_TYPE_SOLID,
.fill_colour = data->background_colour,
};
box = html->layout;
assert(box);
/* The select menu needs special treating because, when opened, it
* reaches beyond its layout box.
*/
select = false;
select_only = false;
if (ctx->interactive && html->visible_select_menu != NULL) {
struct form_control *control = html->visible_select_menu;
select = true;
/* check if the redraw rectangle is completely inside of the
select menu */
select_only = form_clip_inside_select_menu(control,
data->scale, clip);
}
if (!select_only) {
/* clear to background colour */
result = (ctx->plot->clip(ctx, clip) == NSERROR_OK);
if (html->background_colour != NS_TRANSPARENT)
pstyle_fill_bg.fill_colour = html->background_colour;
result &= (ctx->plot->rectangle(ctx, &pstyle_fill_bg, clip) == NSERROR_OK);
result &= html_redraw_box(html, box, data->x, data->y, clip,
data->scale, pstyle_fill_bg.fill_colour, ctx);
}
if (select) {
int menu_x, menu_y;
box = html->visible_select_menu->box;
box_coords(box, &menu_x, &menu_y);
menu_x -= box->border[LEFT].width;
menu_y += box->height + box->border[BOTTOM].width +
box->padding[BOTTOM] + box->padding[TOP];
result &= form_redraw_select_menu(html->visible_select_menu,
data->x + menu_x, data->y + menu_y,
data->scale, clip, ctx);
}
return result;
}
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