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netsurf/gtk/print.c

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/*
* Copyright 2006 Rob Kendrick <rjek@rjek.com>
* Copyright 2005 James Bursa <bursa@users.sourceforge.net>
* Copyright 2008 Adam Blokus <adamblokus@gmail.com>
*
* 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
* GTK printing (implementation).
* All the functions and structures necessary for printing( signal handlers,
* plotters, printer) are here.
* Most of the plotters have been copied from the gtk_plotters.c file.
*/
#include "utils/config.h"
#include <math.h>
#include <assert.h>
#include <gdk/gdk.h>
#include <gtk/gtk.h>
#include "content/content.h"
#include "content/hlcache.h"
#include "desktop/options.h"
#include "desktop/plotters.h"
#include "desktop/print.h"
#include "desktop/printer.h"
#include "gtk/font_pango.h"
#include "gtk/bitmap.h"
#include "gtk/print.h"
#include "gtk/scaffolding.h"
#include "render/font.h"
#include "utils/log.h"
#include "utils/utils.h"
/* Globals */
cairo_t *gtk_print_current_cr;
static struct print_settings* settings;
hlcache_handle *content_to_print;
static GdkRectangle cliprect;
static inline void nsgtk_print_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_colormap_alloc_color(gdk_colormap_get_system(), &colour, true, true);
cairo_set_source_rgba(gtk_print_current_cr, r / 255.0,
g / 255.0, b / 255.0, 1.0);
}
static bool gtk_print_font_paint(int x, int y,
const char *string, size_t length,
const plot_font_style_t *fstyle)
{
PangoFontDescription *desc;
PangoLayout *layout;
gint size;
PangoLayoutLine *line;
if (length == 0)
return true;
desc = nsfont_style_to_description(fstyle);
size = (gint) ((double) pango_font_description_get_size(desc) *
settings->scale);
if (pango_font_description_get_size_is_absolute(desc))
pango_font_description_set_absolute_size(desc, size);
else
pango_font_description_set_size(desc, size);
layout = pango_cairo_create_layout(gtk_print_current_cr);
pango_layout_set_font_description(layout, desc);
pango_layout_set_text(layout, string, length);
line = pango_layout_get_line(layout, 0);
cairo_move_to(gtk_print_current_cr, x, y);
nsgtk_print_set_colour(fstyle->foreground);
pango_cairo_show_layout_line(gtk_print_current_cr, line);
g_object_unref(layout);
pango_font_description_free(desc);
return true;
}
/** Set cairo context to solid plot operation. */
static inline void nsgtk_print_set_solid(void)
{
double dashes = 0;
cairo_set_dash(gtk_print_current_cr, &dashes, 0, 0);
}
/** Set cairo context to dotted plot operation. */
static inline void nsgtk_print_set_dotted(void)
{
double cdashes[] = { 1.0, 2.0 };
cairo_set_dash(gtk_print_current_cr, cdashes, 1, 0);
}
/** Set cairo context to dashed plot operation. */
static inline void nsgtk_print_set_dashed(void)
{
double cdashes[] = { 8.0, 2.0 };
cairo_set_dash(gtk_print_current_cr, cdashes, 1, 0);
}
/** Set clipping area for subsequent plot operations. */
static bool nsgtk_print_plot_clip(const struct rect *clip)
{
LOG(("Clipping. x0: %i ;\t y0: %i ;\t x1: %i ;\t y1: %i",
clip->x0, clip->y0, clip->x1, clip->y1));
/* Normalize cllipping area - to prevent overflows.
* See comment in pdf_plot_fill. */
int clip_x0 = min(max(clip->x0, 0), settings->page_width);
int clip_y0 = min(max(clip->y0, 0), settings->page_height);
int clip_x1 = min(max(clip->x1, 0), settings->page_width);
int clip_y1 = min(max(clip->y1, 0), settings->page_height);
cairo_reset_clip(gtk_print_current_cr);
cairo_rectangle(gtk_print_current_cr, clip_x0, clip_y0,
clip_x1 - clip_x0, clip_y1 - clip_y0);
cairo_clip(gtk_print_current_cr);
cliprect.x = clip_x0;
cliprect.y = clip_y0;
cliprect.width = clip_x1 - clip_x0;
cliprect.height = clip_y1 - clip_y0;
return true;
}
static bool nsgtk_print_plot_arc(int x, int y, int radius, int angle1, int angle2, const plot_style_t *style)
{
nsgtk_print_set_colour(style->fill_colour);
nsgtk_print_set_solid();
cairo_set_line_width(gtk_print_current_cr, 1);
cairo_arc(gtk_print_current_cr, x, y, radius,
(angle1 + 90) * (M_PI / 180),
(angle2 + 90) * (M_PI / 180));
cairo_stroke(gtk_print_current_cr);
return true;
}
static bool nsgtk_print_plot_disc(int x, int y, int radius, const plot_style_t *style)
{
if (style->fill_type != PLOT_OP_TYPE_NONE) {
nsgtk_print_set_colour(style->fill_colour);
nsgtk_print_set_solid();
cairo_set_line_width(gtk_print_current_cr, 0);
cairo_arc(gtk_print_current_cr, x, y, radius, 0, M_PI * 2);
cairo_fill(gtk_print_current_cr);
cairo_stroke(gtk_print_current_cr);
}
if (style->stroke_type != PLOT_OP_TYPE_NONE) {
nsgtk_print_set_colour(style->stroke_colour);
switch (style->stroke_type) {
case PLOT_OP_TYPE_SOLID: /**< Solid colour */
default:
nsgtk_print_set_solid();
break;
case PLOT_OP_TYPE_DOT: /**< Doted plot */
nsgtk_print_set_dotted();
break;
case PLOT_OP_TYPE_DASH: /**< dashed plot */
nsgtk_print_set_dashed();
break;
}
if (style->stroke_width == 0)
cairo_set_line_width(gtk_print_current_cr, 1);
else
cairo_set_line_width(gtk_print_current_cr, style->stroke_width);
cairo_arc(gtk_print_current_cr, x, y, radius, 0, M_PI * 2);
cairo_stroke(gtk_print_current_cr);
}
return true;
}
static bool nsgtk_print_plot_line(int x0, int y0, int x1, int y1, const plot_style_t *style)
{
nsgtk_print_set_colour(style->stroke_colour);
switch (style->stroke_type) {
case PLOT_OP_TYPE_SOLID: /**< Solid colour */
default:
nsgtk_print_set_solid();
break;
case PLOT_OP_TYPE_DOT: /**< Doted plot */
nsgtk_print_set_dotted();
break;
case PLOT_OP_TYPE_DASH: /**< dashed plot */
nsgtk_print_set_dashed();
break;
}
if (style->stroke_width == 0)
cairo_set_line_width(gtk_print_current_cr, 1);
else
cairo_set_line_width(gtk_print_current_cr, style->stroke_width);
cairo_move_to(gtk_print_current_cr, x0 + 0.5, y0 + 0.5);
cairo_line_to(gtk_print_current_cr, x1 + 0.5, y1 + 0.5);
cairo_stroke(gtk_print_current_cr);
return true;
}
static bool nsgtk_print_plot_rectangle(int x0, int y0, int x1, int y1, const plot_style_t *style)
{
LOG(("x0: %i ;\t y0: %i ;\t x1: %i ;\t y1: %i", x0,y0,x1,y1));
if (style->fill_type != PLOT_OP_TYPE_NONE) {
nsgtk_print_set_colour(style->fill_colour);
nsgtk_print_set_solid();
/* Normalize boundaries of the area - to prevent overflows.
* See comment in pdf_plot_fill. */
x0 = min(max(x0, 0), settings->page_width);
y0 = min(max(y0, 0), settings->page_height);
x1 = min(max(x1, 0), settings->page_width);
y1 = min(max(y1, 0), settings->page_height);
cairo_set_line_width(gtk_print_current_cr, 0);
cairo_rectangle(gtk_print_current_cr, x0, y0, x1 - x0, y1 - y0);
cairo_fill(gtk_print_current_cr);
cairo_stroke(gtk_print_current_cr);
}
if (style->stroke_type != PLOT_OP_TYPE_NONE) {
nsgtk_print_set_colour(style->stroke_colour);
switch (style->stroke_type) {
case PLOT_OP_TYPE_SOLID: /**< Solid colour */
default:
nsgtk_print_set_solid();
break;
case PLOT_OP_TYPE_DOT: /**< Doted plot */
nsgtk_print_set_dotted();
break;
case PLOT_OP_TYPE_DASH: /**< dashed plot */
nsgtk_print_set_dashed();
break;
}
if (style->stroke_width == 0)
cairo_set_line_width(gtk_print_current_cr, 1);
else
cairo_set_line_width(gtk_print_current_cr, style->stroke_width);
cairo_rectangle(gtk_print_current_cr, x0, y0, x1 - x0, y1 - y0);
cairo_stroke(gtk_print_current_cr);
}
return true;
}
static bool nsgtk_print_plot_polygon(const int *p, unsigned int n, const plot_style_t *style)
{
unsigned int i;
LOG(("Plotting polygon."));
nsgtk_print_set_colour(style->fill_colour);
nsgtk_print_set_solid();
cairo_set_line_width(gtk_print_current_cr, 0);
cairo_move_to(gtk_print_current_cr, p[0], p[1]);
LOG(("Starting line at: %i\t%i",p[0],p[1]));
for (i = 1; i != n; i++) {
cairo_line_to(gtk_print_current_cr, p[i * 2], p[i * 2 + 1]);
LOG(("Drawing line to: %i\t%i",p[i * 2], p[i * 2 + 1]));
}
cairo_fill(gtk_print_current_cr);
cairo_stroke(gtk_print_current_cr);
return true;
}
static bool nsgtk_print_plot_path(const float *p, unsigned int n, colour fill,
float width, colour c, const float transform[6])
{
/* Only the internal SVG renderer uses this plot call currently,
* and the GTK version uses librsvg. Thus, we ignore this complexity,
* and just return true obliviously. */
return true;
}
static bool nsgtk_print_plot_pixbuf(int x, int y, int width, int height,
struct bitmap *bitmap, colour bg)
{
int x0, y0, x1, y1;
int dsrcx, dsrcy, dwidth, dheight;
int bmwidth, bmheight;
cairo_surface_t *bmsurface = bitmap->surface;
/* 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 = x;
dsrcy = y;
dwidth = width;
dheight = height;
/* Manually clip draw coordinates to area of image to be rendered */
if (x0 > 0) {
/* Clip left */
dsrcx += x0;
dwidth -= x0;
}
if (y0 > 0) {
/* Clip top */
dsrcy += 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;
bmwidth = cairo_image_surface_get_width(bmsurface);
bmheight = cairo_image_surface_get_height(bmsurface);
/* Render the bitmap */
if ((bmwidth == width) && (bmheight == height)) {
/* Bitmap is not scaled */
/* Plot the bitmap */
cairo_set_source_surface(gtk_print_current_cr, bmsurface, x, y);
cairo_rectangle(gtk_print_current_cr, dsrcx, dsrcy, dwidth, dheight);
cairo_fill(gtk_print_current_cr);
} else {
/* Bitmap is scaled */
if ((bitmap->scsurface != NULL) &&
((cairo_image_surface_get_width(bitmap->scsurface) != width) ||
(cairo_image_surface_get_height(bitmap->scsurface) != height))){
cairo_surface_destroy(bitmap->scsurface);
bitmap->scsurface = NULL;
}
if (bitmap->scsurface == NULL) {
bitmap->scsurface = cairo_surface_create_similar(bmsurface,CAIRO_CONTENT_COLOR_ALPHA, width, height);
cairo_t *cr = cairo_create(bitmap->scsurface);
/* Scale *before* setting the source surface (1) */
cairo_scale(cr, (double)width / bmwidth, (double)height / bmheight);
cairo_set_source_surface(cr, bmsurface, 0, 0);
/* To avoid getting the edge pixels blended with 0
* alpha, which would occur with the default
* EXTEND_NONE. Use EXTEND_PAD for 1.2 or newer (2)
*/
cairo_pattern_set_extend(cairo_get_source(cr),
CAIRO_EXTEND_REFLECT);
/* Replace the destination with the source instead of
* overlaying
*/
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
/* Do the actual drawing */
cairo_paint(cr);
cairo_destroy(cr);
}
/* Plot the scaled bitmap */
cairo_set_source_surface(gtk_print_current_cr, bitmap->scsurface, x, y);
cairo_rectangle(gtk_print_current_cr, dsrcx, dsrcy, dwidth, dheight);
cairo_fill(gtk_print_current_cr);
}
return true;
}
static bool nsgtk_print_plot_bitmap(int x, int y, int width, int height,
struct bitmap *bitmap, colour bg,
bitmap_flags_t flags)
{
int doneheight = 0, donewidth = 0;
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 */
return nsgtk_print_plot_pixbuf(x, y, width, height, bitmap, bg);
}
width = bitmap_get_width(bitmap);
height = bitmap_get_height(bitmap);
/* Bail early if we can */
if (width == 0 || height == 0)
/* Nothing to plot */
return true;
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_print_plot_pixbuf(donewidth, doneheight,
width, height, bitmap, bg);
donewidth += width;
if (!repeat_x)
break;
}
doneheight += height;
if (!repeat_y)
break;
}
return true;
}
static bool nsgtk_print_plot_text(int x, int y, const char *text, size_t length,
const plot_font_style_t *fstyle)
{
return gtk_print_font_paint(x, y, text, length, fstyle);
}
/** GTK print plotter table */
static const struct plotter_table nsgtk_print_plotters = {
.clip = nsgtk_print_plot_clip,
.arc = nsgtk_print_plot_arc,
.disc = nsgtk_print_plot_disc,
.line = nsgtk_print_plot_line,
.rectangle = nsgtk_print_plot_rectangle,
.polygon = nsgtk_print_plot_polygon,
.path = nsgtk_print_plot_path,
.bitmap = nsgtk_print_plot_bitmap,
.text = nsgtk_print_plot_text,
.option_knockout = false,
};
static bool gtk_print_begin(struct print_settings* settings)
{
return true;
}
static bool gtk_print_next_page(void)
{
return true;
}
static void gtk_print_end(void)
{
}
static const struct printer gtk_printer = {
&nsgtk_print_plotters,
gtk_print_begin,
gtk_print_next_page,
gtk_print_end
};
/**
* Handle the begin_print signal from the GtkPrintOperation
*
* \param operation the operation which emited the signal
* \param context the print context used to set up the pages
* \param user_data nothing in here
*/
void gtk_print_signal_begin_print (GtkPrintOperation *operation,
GtkPrintContext *context, gpointer user_data)
{
int page_number;
double height_on_page, height_to_print;
LOG(("Begin print"));
settings = user_data;
settings->margins[MARGINTOP] = 0;
settings->margins[MARGINLEFT] = 0;
settings->margins[MARGINBOTTOM] = 0;
settings->margins[MARGINRIGHT] = 0;
settings->page_width = gtk_print_context_get_width(context);
settings->page_height = gtk_print_context_get_height(context);
settings->scale = 0.7;/*at 0.7 the pages look the best*/
settings->font_func = &nsfont;
if (print_set_up(content_to_print, &gtk_printer,
settings, &height_to_print) == false) {
gtk_print_operation_cancel(operation);
} else {
LOG(("page_width: %f ;page_height: %f; content height: %lf",
settings->page_width, settings->page_height,
height_to_print));
height_on_page = settings->page_height;
height_on_page = height_on_page -
FIXTOFLT(FSUB(settings->margins[MARGINTOP],
settings->margins[MARGINBOTTOM]));
height_to_print *= settings->scale;
page_number = height_to_print / height_on_page;
if (height_to_print - page_number * height_on_page > 0)
page_number += 1;
gtk_print_operation_set_n_pages(operation, page_number);
}
}
/**
* Handle the draw_page signal from the GtkPrintOperation.
* This function changes only the cairo context to print on.
*/
void gtk_print_signal_draw_page(GtkPrintOperation *operation,
GtkPrintContext *context, gint page_nr, gpointer user_data)
{
LOG(("Draw Page"));
gtk_print_current_cr = gtk_print_context_get_cairo_context(context);
print_draw_next_page(&gtk_printer, settings);
}
/**
* Handle the end_print signal from the GtkPrintOperation.
* This functions calls only the print_cleanup function from the print interface
*/
void gtk_print_signal_end_print(GtkPrintOperation *operation,
GtkPrintContext *context, gpointer user_data)
{
LOG(("End print"));
print_cleanup(content_to_print, &gtk_printer, user_data);
}
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