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netsurf/gtk/gtk_plotters.c

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/*
* Copyright 2006 Rob Kendrick <rjek@rjek.com>
* Copyright 2005 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 (GDK / GTK+ and Cairo implementation).
* Can use either GDK drawing primitives (which are mostly passed straight
* to X to process, and thus accelerated) or Cairo drawing primitives (much
* higher quality, not accelerated). Cairo's fast enough, so it defaults
* to using it if it is available. It does this by checking for the
* CAIRO_VERSION define that the cairo headers set.
*/
#include <math.h>
#include <assert.h>
#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include "desktop/plotters.h"
#include "gtk/font_pango.h"
#include "gtk/gtk_plotters.h"
#include "gtk/gtk_scaffolding.h"
#include "render/font.h"
#include "utils/log.h"
#include "desktop/options.h"
#include "gtk/options.h"
#include "gtk/gtk_bitmap.h"
#ifndef CAIRO_VERSION
#error "nsgtk requires cairo"
#endif
GtkWidget *current_widget;
GdkDrawable *current_drawable;
GdkGC *current_gc;
cairo_t *current_cr;
static GdkRectangle cliprect;
static float nsgtk_plot_scale = 1.0;
struct plotter_table plot;
/** set plotting scale factor. */
void nsgtk_plot_set_scale(float s)
{
nsgtk_plot_scale = s;
}
/** get plotting scale factor. */
float nsgtk_plot_get_scale(void)
{
return nsgtk_plot_scale;
}
/** Set cairo context colour to nsgtk colour. */
void nsgtk_set_colour(colour c)
{
int r, g, b;
GdkColor colour;
r = c & 0xff;
g = (c & 0xff00) >> 8;
b = (c & 0xff0000) >> 16;
colour.red = r | (r << 8);
colour.green = g | (g << 8);
colour.blue = b | (b << 8);
colour.pixel = (r << 16) | (g << 8) | b;
gdk_color_alloc(gdk_colormap_get_system(),
&colour);
gdk_gc_set_foreground(current_gc, &colour);
cairo_set_source_rgba(current_cr, r / 255.0,
g / 255.0, b / 255.0, 1.0);
}
/** Plot a caret.
*
* @note It is assumed that the plotters have been set up.
*/
void nsgtk_plot_caret(int x, int y, int h)
{
GdkColor colour;
colour.red = 0;
colour.green = 0;
colour.blue = 0;
colour.pixel = 0;
gdk_color_alloc(gdk_colormap_get_system(),
&colour);
gdk_gc_set_foreground(current_gc, &colour);
gdk_draw_line(current_drawable, current_gc,
x, y,
x, y + h - 1);
}
/** Set cairo context to solid plot operation. */
static inline void nsgtk_set_solid(void)
{
double dashes = 0;
cairo_set_dash(current_cr, &dashes, 0, 0);
}
/** Set cairo context to dotted plot operation. */
static inline void nsgtk_set_dotted(void)
{
double cdashes[] = { 1.0, 2.0 };
cairo_set_dash(current_cr, cdashes, 2, 0);
}
/** Set cairo context to dashed plot operation. */
static inline void nsgtk_set_dashed(void)
{
double cdashes[] = { 8.0, 2.0 };
cairo_set_dash(current_cr, cdashes, 2, 0);
}
/** Set clipping area for subsequent plot operations. */
static bool nsgtk_plot_clip(int clip_x0, int clip_y0, int clip_x1, int clip_y1)
{
cairo_reset_clip(current_cr);
cairo_rectangle(current_cr, clip_x0, clip_y0,
clip_x1 - clip_x0, clip_y1 - clip_y0);
cairo_clip(current_cr);
cliprect.x = clip_x0;
cliprect.y = clip_y0;
cliprect.width = clip_x1 - clip_x0;
cliprect.height = clip_y1 - clip_y0;
gdk_gc_set_clip_rectangle(current_gc, &cliprect);
return true;
}
static bool nsgtk_plot_arc(int x, int y, int radius, int angle1, int angle2, const plot_style_t *style)
{
nsgtk_set_colour(style->fill_colour);
nsgtk_set_solid();
cairo_set_line_width(current_cr, 1);
cairo_arc(current_cr, x, y, radius,
(angle1 + 90) * (M_PI / 180),
(angle2 + 90) * (M_PI / 180));
cairo_stroke(current_cr);
return true;
}
static bool nsgtk_plot_disc(int x, int y, int radius, const plot_style_t *style)
{
if (style->fill_type != PLOT_OP_TYPE_NONE) {
nsgtk_set_colour(style->fill_colour);
nsgtk_set_solid();
cairo_set_line_width(current_cr, 0);
cairo_arc(current_cr, x, y, radius, 0, M_PI * 2);
cairo_fill(current_cr);
cairo_stroke(current_cr);
}
if (style->stroke_type != PLOT_OP_TYPE_NONE) {
nsgtk_set_colour(style->stroke_colour);
switch (style->stroke_type) {
case PLOT_OP_TYPE_SOLID: /**< Solid colour */
default:
nsgtk_set_solid();
break;
case PLOT_OP_TYPE_DOT: /**< Doted plot */
nsgtk_set_dotted();
break;
case PLOT_OP_TYPE_DASH: /**< dashed plot */
nsgtk_set_dashed();
break;
}
if (style->stroke_width == 0)
cairo_set_line_width(current_cr, 1);
else
cairo_set_line_width(current_cr, style->stroke_width);
cairo_arc(current_cr, x, y, radius, 0, M_PI * 2);
cairo_stroke(current_cr);
}
return true;
}
static bool nsgtk_plot_line(int x0, int y0, int x1, int y1, const plot_style_t *style)
{
nsgtk_set_colour(style->stroke_colour);
switch (style->stroke_type) {
case PLOT_OP_TYPE_SOLID: /**< Solid colour */
default:
nsgtk_set_solid();
break;
case PLOT_OP_TYPE_DOT: /**< Doted plot */
nsgtk_set_dotted();
break;
case PLOT_OP_TYPE_DASH: /**< dashed plot */
nsgtk_set_dashed();
break;
}
if (style->stroke_type != PLOT_OP_TYPE_NONE) {
nsgtk_set_colour(style->stroke_colour);
}
if (style->stroke_width == 0)
cairo_set_line_width(current_cr, 1);
else
cairo_set_line_width(current_cr, style->stroke_width);
/* core expects horizontal and vertical lines to be on pixels, not
* between pixels */
cairo_move_to(current_cr, (x0 == x1) ? x0 + 0.5 : x0,
(y0 == y1) ? y0 + 0.5 : y0);
cairo_line_to(current_cr, (x0 == x1) ? x1 + 0.5 : x1,
(y0 == y1) ? y1 + 0.5 : y1);
cairo_stroke(current_cr);
return true;
}
static bool nsgtk_plot_rectangle(int x0, int y0, int x1, int y1, const plot_style_t *style)
{
if (style->fill_type != PLOT_OP_TYPE_NONE) {
nsgtk_set_colour(style->fill_colour);
nsgtk_set_solid();
cairo_set_line_width(current_cr, 0);
cairo_rectangle(current_cr, x0, y0, x1 - x0, y1 - y0);
cairo_fill(current_cr);
cairo_stroke(current_cr);
}
if (style->stroke_type != PLOT_OP_TYPE_NONE) {
nsgtk_set_colour(style->stroke_colour);
switch (style->stroke_type) {
case PLOT_OP_TYPE_SOLID: /**< Solid colour */
default:
nsgtk_set_solid();
break;
case PLOT_OP_TYPE_DOT: /**< Doted plot */
nsgtk_set_dotted();
break;
case PLOT_OP_TYPE_DASH: /**< dashed plot */
nsgtk_set_dashed();
break;
}
if (style->stroke_width == 0)
cairo_set_line_width(current_cr, 1);
else
cairo_set_line_width(current_cr, style->stroke_width);
cairo_rectangle(current_cr, x0 + 0.5, y0 + 0.5, x1 - x0, y1 - y0);
cairo_stroke(current_cr);
}
return true;
}
static bool nsgtk_plot_polygon(const int *p, unsigned int n, const plot_style_t *style)
{
unsigned int i;
nsgtk_set_colour(style->fill_colour);
nsgtk_set_solid();
cairo_set_line_width(current_cr, 0);
cairo_move_to(current_cr, p[0], p[1]);
for (i = 1; i != n; i++) {
cairo_line_to(current_cr, p[i * 2], p[i * 2 + 1]);
}
cairo_fill(current_cr);
cairo_stroke(current_cr);
return true;
}
static bool nsgtk_plot_text(int x, int y, const char *text, size_t length,
const plot_font_style_t *fstyle)
{
return nsfont_paint(x, y, text, length, fstyle);
}
static bool nsgtk_plot_pixbuf(int x, int y, int width, int height,
GdkPixbuf *pixbuf, colour bg)
{
/* XXX: This currently ignores the background colour supplied.
* Does this matter?
*/
int x0, y0, x1, y1;
int dsrcx, dsrcy, dwidth, dheight;
/* Bail early if we can */
if (width == 0 || height == 0)
/* Nothing to plot */
return true;
if ((x > (cliprect.x + cliprect.width)) ||
((x + width) < cliprect.x) ||
(y > (cliprect.y + cliprect.height)) ||
((y + height) < cliprect.y)) {
/* Image completely outside clip region */
return true;
}
/* Get clip rectangle / image rectangle edge differences */
x0 = cliprect.x - x;
y0 = cliprect.y - y;
x1 = (x + width) - (cliprect.x + cliprect.width);
y1 = (y + height) - (cliprect.y + cliprect.height);
/* Set initial draw geometry */
dsrcx = dsrcy = 0;
dwidth = width;
dheight = height;
/* Manually clip draw coordinates to area of image to be rendered */
if (x0 > 0) {
/* Clip left */
dsrcx = x0;
x += x0;
dwidth -= x0;
}
if (y0 > 0) {
/* Clip top */
dsrcy = y0;
y += y0;
dheight -= y0;
}
if (x1 > 0) {
/* Clip right */
dwidth -= x1;
}
if (y1 > 0) {
/* Clip bottom */
dheight -= y1;
}
if (dwidth == 0 || dheight == 0)
/* Nothing to plot */
return true;
/* Render the bitmap */
if (gdk_pixbuf_get_width(pixbuf) == width &&
gdk_pixbuf_get_height(pixbuf) == height) {
/* Bitmap is not scaled */
/* Plot the bitmap */
gdk_draw_pixbuf(current_drawable, current_gc, pixbuf,
dsrcx, dsrcy, x, y, dwidth, dheight,
GDK_RGB_DITHER_MAX, 0, 0);
} else {
/* Bitmap is scaled */
/* Get scale factors */
double sx = (double)width / gdk_pixbuf_get_width(pixbuf);
double sy = (double)height / gdk_pixbuf_get_height(pixbuf);
/* Create bitmap for scaled image portion */
GdkPixbuf *scaled = gdk_pixbuf_new(GDK_COLORSPACE_RGB, true, 8,
dwidth, dheight);
/* Only scale up the portion of the bitmap that we are
* interested in rendering */
gdk_pixbuf_scale(pixbuf, scaled,
0, 0, dwidth, dheight,
-dsrcx, -dsrcy, sx, sy,
option_render_resample ? GDK_INTERP_BILINEAR :
GDK_INTERP_NEAREST);
if (!scaled)
return false;
/* Plot the scaled bitmap */
gdk_draw_pixbuf(current_drawable, current_gc, scaled,
0, 0, x, y, dwidth, dheight,
GDK_RGB_DITHER_MAX, 0, 0);
g_object_unref(scaled);
}
return true;
}
static bool nsgtk_plot_bitmap(int x, int y, int width, int height,
struct bitmap *bitmap, colour bg,
bitmap_flags_t flags)
{
int doneheight = 0, donewidth = 0;
GdkPixbuf *primary;
GdkPixbuf *pretiled = NULL;
bool repeat_x = (flags & BITMAPF_REPEAT_X);
bool repeat_y = (flags & BITMAPF_REPEAT_Y);
if (!(repeat_x || repeat_y)) {
/* Not repeating at all, so just pass it on */
primary = gtk_bitmap_get_primary(bitmap);
return nsgtk_plot_pixbuf(x, y, width, height, primary, bg);
}
if (repeat_x && !repeat_y)
pretiled = gtk_bitmap_get_pretile_x(bitmap);
if (repeat_x && repeat_y)
pretiled = gtk_bitmap_get_pretile_xy(bitmap);
if (!repeat_x && repeat_y)
pretiled = gtk_bitmap_get_pretile_y(bitmap);
assert(pretiled != NULL);
primary = gtk_bitmap_get_primary(bitmap);
/* use the primary and pretiled widths to scale the w/h provided */
width *= gdk_pixbuf_get_width(pretiled);
width /= gdk_pixbuf_get_width(primary);
height *= gdk_pixbuf_get_height(pretiled);
height /= gdk_pixbuf_get_height(primary);
if (y > cliprect.y)
doneheight = (cliprect.y - height) + ((y - cliprect.y) % height);
else
doneheight = y;
while (doneheight < (cliprect.y + cliprect.height)) {
if (x > cliprect.x)
donewidth = (cliprect.x - width) + ((x - cliprect.x) % width);
else
donewidth = x;
while (donewidth < (cliprect.x + cliprect.width)) {
nsgtk_plot_pixbuf(donewidth, doneheight,
width, height, pretiled, bg);
donewidth += width;
if (!repeat_x) break;
}
doneheight += height;
if (!repeat_y) break;
}
return true;
}
static bool nsgtk_plot_path(const float *p, unsigned int n, colour fill, float width,
colour c, const float transform[6])
{
unsigned int i;
cairo_matrix_t old_ctm, n_ctm;
if (n == 0)
return true;
if (p[0] != PLOTTER_PATH_MOVE) {
LOG(("Path does not start with move"));
return false;
}
/* Save CTM */
cairo_get_matrix(current_cr, &old_ctm);
/* Set up line style and width */
cairo_set_line_width(current_cr, 1);
nsgtk_set_solid();
/* Load new CTM */
n_ctm.xx = transform[0];
n_ctm.yx = transform[1];
n_ctm.xy = transform[2];
n_ctm.yy = transform[3];
n_ctm.x0 = transform[4];
n_ctm.y0 = transform[5];
cairo_set_matrix(current_cr, &n_ctm);
/* Construct path */
for (i = 0; i < n; ) {
if (p[i] == PLOTTER_PATH_MOVE) {
cairo_move_to(current_cr, p[i+1], p[i+2]);
i += 3;
} else if (p[i] == PLOTTER_PATH_CLOSE) {
cairo_close_path(current_cr);
i++;
} else if (p[i] == PLOTTER_PATH_LINE) {
cairo_line_to(current_cr, p[i+1], p[i+2]);
i += 3;
} else if (p[i] == PLOTTER_PATH_BEZIER) {
cairo_curve_to(current_cr, p[i+1], p[i+2],
p[i+3], p[i+4],
p[i+5], p[i+6]);
i += 7;
} else {
LOG(("bad path command %f", p[i]));
/* Reset matrix for safety */
cairo_set_matrix(current_cr, &old_ctm);
return false;
}
}
/* Restore original CTM */
cairo_set_matrix(current_cr, &old_ctm);
/* Now draw path */
if (fill != NS_TRANSPARENT) {
nsgtk_set_colour(fill);
if (c != NS_TRANSPARENT) {
/* Fill & Stroke */
cairo_fill_preserve(current_cr);
nsgtk_set_colour(c);
cairo_stroke(current_cr);
} else {
/* Fill only */
cairo_fill(current_cr);
}
} else if (c != NS_TRANSPARENT) {
/* Stroke only */
nsgtk_set_colour(c);
cairo_stroke(current_cr);
}
return true;
}
/** GTK plotter table */
const struct plotter_table nsgtk_plotters = {
.clip = nsgtk_plot_clip,
.arc = nsgtk_plot_arc,
.disc = nsgtk_plot_disc,
.line = nsgtk_plot_line,
.rectangle = nsgtk_plot_rectangle,
.polygon = nsgtk_plot_polygon,
.path = nsgtk_plot_path,
.bitmap = nsgtk_plot_bitmap,
.text = nsgtk_plot_text,
.option_knockout = true
};
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