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weston/shared/cairo-util.c
Louis-Francis Ratté-Boulianne 037f056ec3 xwm: Use Pango to draw title string if available 
If Weston is built with Pango, use it to render the title for
X11 applications and Weston toy toolkit clients. It allows us
to ellipsize the title when there isn't enough space to show the
whole string.

Signed-off-by: Louis-Francis Ratté-Boulianne <lfrb@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
2017-12-05 14:09:31 +00:00

634 lines
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/*
* Copyright © 2008 Kristian Høgsberg
* Copyright © 2012 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial
* portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "config.h"
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <wayland-util.h>
#include <cairo.h>
#include "cairo-util.h"
#include "shared/helpers.h"
#include "image-loader.h"
#include "config-parser.h"
#ifdef HAVE_PANGO
#include <pango/pangocairo.h>
#endif
void
surface_flush_device(cairo_surface_t *surface)
{
cairo_device_t *device;
device = cairo_surface_get_device(surface);
if (device)
cairo_device_flush(device);
}
static int
blur_surface(cairo_surface_t *surface, int margin)
{
int32_t width, height, stride, x, y, z, w;
uint8_t *src, *dst;
uint32_t *s, *d, a, p;
int i, j, k, size, half;
uint32_t kernel[71];
double f;
size = ARRAY_LENGTH(kernel);
width = cairo_image_surface_get_width(surface);
height = cairo_image_surface_get_height(surface);
stride = cairo_image_surface_get_stride(surface);
src = cairo_image_surface_get_data(surface);
dst = malloc(height * stride);
if (dst == NULL)
return -1;
half = size / 2;
a = 0;
for (i = 0; i < size; i++) {
f = (i - half);
kernel[i] = exp(- f * f / ARRAY_LENGTH(kernel)) * 10000;
a += kernel[i];
}
for (i = 0; i < height; i++) {
s = (uint32_t *) (src + i * stride);
d = (uint32_t *) (dst + i * stride);
for (j = 0; j < width; j++) {
if (margin < j && j < width - margin) {
d[j] = s[j];
continue;
}
x = 0;
y = 0;
z = 0;
w = 0;
for (k = 0; k < size; k++) {
if (j - half + k < 0 || j - half + k >= width)
continue;
p = s[j - half + k];
x += (p >> 24) * kernel[k];
y += ((p >> 16) & 0xff) * kernel[k];
z += ((p >> 8) & 0xff) * kernel[k];
w += (p & 0xff) * kernel[k];
}
d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
}
}
for (i = 0; i < height; i++) {
s = (uint32_t *) (dst + i * stride);
d = (uint32_t *) (src + i * stride);
for (j = 0; j < width; j++) {
if (margin <= i && i < height - margin) {
d[j] = s[j];
continue;
}
x = 0;
y = 0;
z = 0;
w = 0;
for (k = 0; k < size; k++) {
if (i - half + k < 0 || i - half + k >= height)
continue;
s = (uint32_t *) (dst + (i - half + k) * stride);
p = s[j];
x += (p >> 24) * kernel[k];
y += ((p >> 16) & 0xff) * kernel[k];
z += ((p >> 8) & 0xff) * kernel[k];
w += (p & 0xff) * kernel[k];
}
d[j] = (x / a << 24) | (y / a << 16) | (z / a << 8) | w / a;
}
}
free(dst);
cairo_surface_mark_dirty(surface);
return 0;
}
void
render_shadow(cairo_t *cr, cairo_surface_t *surface,
int x, int y, int width, int height, int margin, int top_margin)
{
cairo_pattern_t *pattern;
cairo_matrix_t matrix;
int i, fx, fy, shadow_height, shadow_width;
cairo_set_source_rgba(cr, 0, 0, 0, 0.45);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
pattern = cairo_pattern_create_for_surface (surface);
cairo_pattern_set_filter(pattern, CAIRO_FILTER_NEAREST);
for (i = 0; i < 4; i++) {
/* when fy is set, then we are working with lower corners,
* when fx is set, then we are working with right corners
*
* 00 ------- 01
* | |
* | |
* 10 ------- 11
*/
fx = i & 1;
fy = i >> 1;
cairo_matrix_init_translate(&matrix,
-x + fx * (128 - width),
-y + fy * (128 - height));
cairo_pattern_set_matrix(pattern, &matrix);
shadow_width = margin;
shadow_height = fy ? margin : top_margin;
/* if the shadows together are greater than the surface, we need
* to fix it - set the shadow size to the half of
* the size of surface. Also handle the case when the size is
* not divisible by 2. In that case we need one part of the
* shadow to be one pixel greater. !fy or !fx, respectively,
* will do the work.
*/
if (height < 2 * shadow_height)
shadow_height = (height + !fy) / 2;
if (width < 2 * shadow_width)
shadow_width = (width + !fx) / 2;
cairo_reset_clip(cr);
cairo_rectangle(cr,
x + fx * (width - shadow_width),
y + fy * (height - shadow_height),
shadow_width, shadow_height);
cairo_clip (cr);
cairo_mask(cr, pattern);
}
shadow_width = width - 2 * margin;
shadow_height = top_margin;
if (height < 2 * shadow_height)
shadow_height = height / 2;
if (shadow_width > 0 && shadow_height) {
/* Top stretch */
cairo_matrix_init_translate(&matrix, 60, 0);
cairo_matrix_scale(&matrix, 8.0 / width, 1);
cairo_matrix_translate(&matrix, -x - width / 2, -y);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_rectangle(cr, x + margin, y, shadow_width, shadow_height);
cairo_reset_clip(cr);
cairo_rectangle(cr,
x + margin, y,
shadow_width, shadow_height);
cairo_clip (cr);
cairo_mask(cr, pattern);
/* Bottom stretch */
cairo_matrix_translate(&matrix, 0, -height + 128);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_reset_clip(cr);
cairo_rectangle(cr, x + margin, y + height - margin,
shadow_width, margin);
cairo_clip (cr);
cairo_mask(cr, pattern);
}
shadow_width = margin;
if (width < 2 * shadow_width)
shadow_width = width / 2;
shadow_height = height - margin - top_margin;
/* if height is smaller than sum of margins,
* then the shadow is already done by the corners */
if (shadow_height > 0 && shadow_width) {
/* Left stretch */
cairo_matrix_init_translate(&matrix, 0, 60);
cairo_matrix_scale(&matrix, 1, 8.0 / height);
cairo_matrix_translate(&matrix, -x, -y - height / 2);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_reset_clip(cr);
cairo_rectangle(cr, x, y + top_margin,
shadow_width, shadow_height);
cairo_clip (cr);
cairo_mask(cr, pattern);
/* Right stretch */
cairo_matrix_translate(&matrix, -width + 128, 0);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_rectangle(cr, x + width - shadow_width, y + top_margin,
shadow_width, shadow_height);
cairo_reset_clip(cr);
cairo_clip (cr);
cairo_mask(cr, pattern);
}
cairo_pattern_destroy(pattern);
cairo_reset_clip(cr);
}
void
tile_source(cairo_t *cr, cairo_surface_t *surface,
int x, int y, int width, int height, int margin, int top_margin)
{
cairo_pattern_t *pattern;
cairo_matrix_t matrix;
int i, fx, fy, vmargin;
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
pattern = cairo_pattern_create_for_surface (surface);
cairo_pattern_set_filter(pattern, CAIRO_FILTER_NEAREST);
cairo_set_source(cr, pattern);
cairo_pattern_destroy(pattern);
for (i = 0; i < 4; i++) {
fx = i & 1;
fy = i >> 1;
cairo_matrix_init_translate(&matrix,
-x + fx * (128 - width),
-y + fy * (128 - height));
cairo_pattern_set_matrix(pattern, &matrix);
if (fy)
vmargin = margin;
else
vmargin = top_margin;
cairo_rectangle(cr,
x + fx * (width - margin),
y + fy * (height - vmargin),
margin, vmargin);
cairo_fill(cr);
}
/* Top stretch */
cairo_matrix_init_translate(&matrix, 60, 0);
cairo_matrix_scale(&matrix, 8.0 / (width - 2 * margin), 1);
cairo_matrix_translate(&matrix, -x - width / 2, -y);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_rectangle(cr, x + margin, y, width - 2 * margin, top_margin);
cairo_fill(cr);
/* Bottom stretch */
cairo_matrix_translate(&matrix, 0, -height + 128);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_rectangle(cr, x + margin, y + height - margin,
width - 2 * margin, margin);
cairo_fill(cr);
/* Left stretch */
cairo_matrix_init_translate(&matrix, 0, 60);
cairo_matrix_scale(&matrix, 1, 8.0 / (height - margin - top_margin));
cairo_matrix_translate(&matrix, -x, -y - height / 2);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_rectangle(cr, x, y + top_margin,
margin, height - margin - top_margin);
cairo_fill(cr);
/* Right stretch */
cairo_matrix_translate(&matrix, -width + 128, 0);
cairo_pattern_set_matrix(pattern, &matrix);
cairo_rectangle(cr, x + width - margin, y + top_margin,
margin, height - margin - top_margin);
cairo_fill(cr);
}
void
rounded_rect(cairo_t *cr, int x0, int y0, int x1, int y1, int radius)
{
cairo_move_to(cr, x0, y0 + radius);
cairo_arc(cr, x0 + radius, y0 + radius, radius, M_PI, 3 * M_PI / 2);
cairo_line_to(cr, x1 - radius, y0);
cairo_arc(cr, x1 - radius, y0 + radius, radius, 3 * M_PI / 2, 2 * M_PI);
cairo_line_to(cr, x1, y1 - radius);
cairo_arc(cr, x1 - radius, y1 - radius, radius, 0, M_PI / 2);
cairo_line_to(cr, x0 + radius, y1);
cairo_arc(cr, x0 + radius, y1 - radius, radius, M_PI / 2, M_PI);
cairo_close_path(cr);
}
cairo_surface_t *
load_cairo_surface(const char *filename)
{
pixman_image_t *image;
int width, height, stride;
void *data;
image = load_image(filename);
if (image == NULL) {
return NULL;
}
data = pixman_image_get_data(image);
width = pixman_image_get_width(image);
height = pixman_image_get_height(image);
stride = pixman_image_get_stride(image);
return cairo_image_surface_create_for_data(data, CAIRO_FORMAT_ARGB32,
width, height, stride);
}
void
theme_set_background_source(struct theme *t, cairo_t *cr, uint32_t flags)
{
cairo_pattern_t *pattern;
if (flags & THEME_FRAME_ACTIVE) {
pattern = cairo_pattern_create_linear(16, 16, 16, 112);
cairo_pattern_add_color_stop_rgb(pattern, 0.0, 1.0, 1.0, 1.0);
cairo_pattern_add_color_stop_rgb(pattern, 0.2, 0.8, 0.8, 0.8);
cairo_set_source(cr, pattern);
cairo_pattern_destroy(pattern);
} else {
cairo_set_source_rgba(cr, 0.75, 0.75, 0.75, 1);
}
}
struct theme *
theme_create(void)
{
struct theme *t;
cairo_t *cr;
t = malloc(sizeof *t);
if (t == NULL)
return NULL;
t->margin = 32;
t->width = 6;
t->titlebar_height = 27;
t->frame_radius = 3;
t->shadow = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 128, 128);
cr = cairo_create(t->shadow);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
cairo_set_source_rgba(cr, 0, 0, 0, 1);
rounded_rect(cr, 32, 32, 96, 96, t->frame_radius);
cairo_fill(cr);
if (cairo_status (cr) != CAIRO_STATUS_SUCCESS)
goto err_shadow;
cairo_destroy(cr);
if (blur_surface(t->shadow, 64) == -1)
goto err_shadow;
t->active_frame =
cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 128, 128);
cr = cairo_create(t->active_frame);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
theme_set_background_source(t, cr, THEME_FRAME_ACTIVE);
rounded_rect(cr, 0, 0, 128, 128, t->frame_radius);
cairo_fill(cr);
if (cairo_status(cr) != CAIRO_STATUS_SUCCESS)
goto err_active_frame;
cairo_destroy(cr);
t->inactive_frame =
cairo_image_surface_create (CAIRO_FORMAT_ARGB32, 128, 128);
cr = cairo_create(t->inactive_frame);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
theme_set_background_source(t, cr, 0);
rounded_rect(cr, 0, 0, 128, 128, t->frame_radius);
cairo_fill(cr);
if (cairo_status (cr) != CAIRO_STATUS_SUCCESS)
goto err_inactive_frame;
cairo_destroy(cr);
return t;
err_inactive_frame:
cairo_surface_destroy(t->inactive_frame);
err_active_frame:
cairo_surface_destroy(t->active_frame);
err_shadow:
cairo_surface_destroy(t->shadow);
free(t);
return NULL;
}
void
theme_destroy(struct theme *t)
{
cairo_surface_destroy(t->active_frame);
cairo_surface_destroy(t->inactive_frame);
cairo_surface_destroy(t->shadow);
free(t);
}
#ifdef HAVE_PANGO
static PangoLayout *
create_layout(cairo_t *cr, const char *title)
{
PangoLayout *layout;
PangoFontDescription *desc;
layout = pango_cairo_create_layout(cr);
pango_layout_set_text(layout, title, -1);
desc = pango_font_description_from_string("Sans Bold 10");
pango_layout_set_font_description(layout, desc);
pango_font_description_free(desc);
pango_layout_set_ellipsize(layout, PANGO_ELLIPSIZE_END);
pango_layout_set_alignment(layout, PANGO_ALIGN_LEFT);
pango_layout_set_auto_dir (layout, FALSE);
pango_layout_set_single_paragraph_mode (layout, TRUE);
pango_layout_set_width (layout, -1);
return layout;
}
#endif
#ifdef HAVE_PANGO
#define SHOW_TEXT(cr) \
pango_cairo_show_layout(cr, title_layout)
#else
#define SHOW_TEXT(cr) \
cairo_show_text(cr, title)
#endif
void
theme_render_frame(struct theme *t,
cairo_t *cr, int width, int height,
const char *title, cairo_rectangle_int_t *title_rect,
struct wl_list *buttons, uint32_t flags)
{
cairo_surface_t *source;
int x, y, margin, top_margin;
int text_width, text_height;
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_set_source_rgba(cr, 0, 0, 0, 0);
cairo_paint(cr);
if (flags & THEME_FRAME_MAXIMIZED)
margin = 0;
else {
render_shadow(cr, t->shadow,
2, 2, width + 8, height + 8,
64, 64);
margin = t->margin;
}
if (flags & THEME_FRAME_ACTIVE)
source = t->active_frame;
else
source = t->inactive_frame;
if (title || !wl_list_empty(buttons))
top_margin = t->titlebar_height;
else
top_margin = t->width;
tile_source(cr, source,
margin, margin,
width - margin * 2, height - margin * 2,
t->width, top_margin);
if (title || !wl_list_empty(buttons)) {
cairo_rectangle (cr, title_rect->x, title_rect->y,
title_rect->width, title_rect->height);
cairo_clip(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
#ifdef HAVE_PANGO
PangoLayout *title_layout;
PangoRectangle logical;
title_layout = create_layout(cr, title);
pango_layout_get_pixel_extents (title_layout, NULL, &logical);
text_width = MIN(title_rect->width, logical.width);
text_height = logical.height;
if (text_width < logical.width)
pango_layout_set_width (title_layout, text_width * PANGO_SCALE);
#else
cairo_text_extents_t extents;
cairo_font_extents_t font_extents;
cairo_select_font_face(cr, "sans",
CAIRO_FONT_SLANT_NORMAL,
CAIRO_FONT_WEIGHT_BOLD);
cairo_set_font_size(cr, 14);
cairo_text_extents(cr, title, &extents);
cairo_font_extents (cr, &font_extents);
text_width = extents.width;
text_height = font_extents.descent - font_extents.ascent;
#endif
x = (width - text_width) / 2;
y = margin + (t->titlebar_height - text_height) / 2;
if (x < title_rect->x)
x = title_rect->x;
else if (x + text_width > (title_rect->x + title_rect->width))
x = (title_rect->x + title_rect->width) - text_width;
if (flags & THEME_FRAME_ACTIVE) {
cairo_move_to(cr, x + 1, y + 1);
cairo_set_source_rgb(cr, 1, 1, 1);
SHOW_TEXT(cr);
cairo_move_to(cr, x, y);
cairo_set_source_rgb(cr, 0, 0, 0);
SHOW_TEXT(cr);
} else {
cairo_move_to(cr, x, y);
cairo_set_source_rgb(cr, 0.4, 0.4, 0.4);
SHOW_TEXT(cr);
}
}
}
enum theme_location
theme_get_location(struct theme *t, int x, int y,
int width, int height, int flags)
{
int vlocation, hlocation, location;
int margin, top_margin, grip_size;
if (flags & THEME_FRAME_MAXIMIZED) {
margin = 0;
grip_size = 0;
} else {
margin = t->margin;
grip_size = 8;
}
if (flags & THEME_FRAME_NO_TITLE)
top_margin = t->width;
else
top_margin = t->titlebar_height;
if (x < margin)
hlocation = THEME_LOCATION_EXTERIOR;
else if (x < margin + grip_size)
hlocation = THEME_LOCATION_RESIZING_LEFT;
else if (x < width - margin - grip_size)
hlocation = THEME_LOCATION_INTERIOR;
else if (x < width - margin)
hlocation = THEME_LOCATION_RESIZING_RIGHT;
else
hlocation = THEME_LOCATION_EXTERIOR;
if (y < margin)
vlocation = THEME_LOCATION_EXTERIOR;
else if (y < margin + grip_size)
vlocation = THEME_LOCATION_RESIZING_TOP;
else if (y < height - margin - grip_size)
vlocation = THEME_LOCATION_INTERIOR;
else if (y < height - margin)
vlocation = THEME_LOCATION_RESIZING_BOTTOM;
else
vlocation = THEME_LOCATION_EXTERIOR;
location = vlocation | hlocation;
if (location & THEME_LOCATION_EXTERIOR)
location = THEME_LOCATION_EXTERIOR;
if (location == THEME_LOCATION_INTERIOR &&
y < margin + top_margin)
location = THEME_LOCATION_TITLEBAR;
else if (location == THEME_LOCATION_INTERIOR)
location = THEME_LOCATION_CLIENT_AREA;
return location;
}
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