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-rw-r--r--frontends/gtk/plotters.c538
1 files changed, 538 insertions, 0 deletions
diff --git a/frontends/gtk/plotters.c b/frontends/gtk/plotters.c
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index 000000000..1d8c19827
--- /dev/null
+++ b/frontends/gtk/plotters.c
@@ -0,0 +1,538 @@
+/*
+ * 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
+ * GTK and Cairo plotter implementations.
+ *
+ * Uses Cairo drawing primitives to render browser output.
+ * \todo remove the use of the gdk structure for clipping
+ */
+
+#include <math.h>
+#include <assert.h>
+#include <gdk/gdk.h>
+#include <gtk/gtk.h>
+
+#include "utils/log.h"
+#include "utils/utils.h"
+#include "desktop/plotters.h"
+#include "utils/nsoption.h"
+
+#include "gtk/layout_pango.h"
+#include "gtk/plotters.h"
+#include "gtk/scaffolding.h"
+#include "gtk/bitmap.h"
+
+GtkWidget *current_widget;
+cairo_t *current_cr;
+
+static GdkRectangle cliprect;
+
+struct plotter_table plot;
+
+/** Set cairo context colour to nsgtk colour. */
+void nsgtk_set_colour(colour c)
+{
+ cairo_set_source_rgba(current_cr,
+ (c & 0xff) / 255.0,
+ ((c & 0xff00) >> 8) / 255.0,
+ ((c & 0xff0000) >> 16) / 255.0,
+ 1.0);
+}
+
+/** 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(const struct rect *clip)
+{
+ 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;
+
+ 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;
+}
+
+/** Plot a caret.
+ *
+ * @note It is assumed that the plotters have been set up.
+ */
+void nsgtk_plot_caret(int x, int y, int h)
+{
+ nsgtk_set_solid(); /* solid line */
+ nsgtk_set_colour(0); /* black */
+ cairo_set_line_width(current_cr, 1); /* thin line */
+
+ /* core expects horizontal and vertical lines to be on pixels, not
+ * between pixels */
+ cairo_move_to(current_cr, x + 0.5, y);
+ cairo_line_to(current_cr, x + 0.5, y + h - 1);
+ cairo_stroke(current_cr);
+}
+
+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 struct plot_font_style *fstyle)
+{
+ return nsfont_paint(x, y, text, length, fstyle);
+}
+
+
+
+static bool nsgtk_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(current_cr, bmsurface, x, y);
+ cairo_rectangle(current_cr, dsrcx, dsrcy, dwidth, dheight);
+ cairo_fill(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(current_cr, bitmap->scsurface, x, y);
+ cairo_rectangle(current_cr, dsrcx, dsrcy, dwidth, dheight);
+ cairo_fill(current_cr);
+
+
+ }
+
+ 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;
+ bool repeat_x = (flags & BITMAPF_REPEAT_X);
+ bool repeat_y = (flags & BITMAPF_REPEAT_Y);
+
+ /* Bail early if we can */
+ if (width == 0 || height == 0)
+ /* Nothing to plot */
+ return true;
+
+ if (!(repeat_x || repeat_y)) {
+ /* Not repeating at all, so just pass it on */
+ return nsgtk_plot_pixbuf(x, y, width, height, bitmap, bg);
+ }
+
+ 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, bitmap, 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
+};
+
+
+