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#include <cairo/cairo.h>
#include <math.h>
#include <unistd.h>
#include "entry.h"
#include "log.h"
#include "nelem.h"
#undef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
static void rounded_rectangle(cairo_t *cr, uint32_t width, uint32_t height, uint32_t r)
{
cairo_new_path(cr);
/* Top-left */
cairo_arc(cr, r, r, r, -M_PI, -M_PI_2);
/* Top-right */
cairo_arc(cr, width - r, r, r, -M_PI_2, 0);
/* Bottom-right */
cairo_arc(cr, width - r, height - r, r, 0, M_PI_2);
/* Bottom-left */
cairo_arc(cr, r, height - r, r, M_PI_2, M_PI);
cairo_close_path(cr);
}
void entry_init(struct entry *entry, uint8_t *restrict buffer, uint32_t width, uint32_t height)
{
entry->image.width = width;
entry->image.height = height;
/*
* Create the cairo surfaces and contexts we'll be using.
*
* In order to avoid an unnecessary copy when passing the image to the
* Wayland server, we accept a pointer to the mmap-ed file that our
* Wayland buffers are created from. This is assumed to be
* (width * height * (sizeof(uint32_t) == 4) * 2) bytes,
* to allow for double buffering.
*/
cairo_surface_t *surface = cairo_image_surface_create_for_data(
buffer,
CAIRO_FORMAT_ARGB32,
width,
height,
width * sizeof(uint32_t)
);
cairo_t *cr = cairo_create(surface);
entry->cairo[0].surface = surface;
entry->cairo[0].cr = cr;
entry->cairo[1].surface = cairo_image_surface_create_for_data(
&buffer[width * height * sizeof(uint32_t)],
CAIRO_FORMAT_ARGB32,
width,
height,
width * sizeof(uint32_t)
);
entry->cairo[1].cr = cairo_create(entry->cairo[1].surface);
/* Draw the background */
struct color color = entry->background_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_paint(cr);
/* Draw the border with outlines */
cairo_set_line_width(cr, 4 * entry->outline_width + 2 * entry->border_width);
rounded_rectangle(cr, width, height, entry->corner_radius);
color = entry->outline_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_stroke_preserve(cr);
color = entry->border_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_set_line_width(cr, 2 * entry->outline_width + 2 * entry->border_width);
cairo_stroke_preserve(cr);
color = entry->outline_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_set_line_width(cr, 2 * entry->outline_width);
cairo_stroke_preserve(cr);
/* Clear the overdrawn bits outside of the rounded corners */
cairo_rectangle(cr, 0, 0, width, height);
cairo_set_source_rgba(cr, 0, 0, 0, 0.5);
cairo_save(cr);
cairo_set_fill_rule(cr, CAIRO_FILL_RULE_EVEN_ODD);
cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
cairo_fill(cr);
cairo_restore(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
/* Move and clip following draws to be within this outline + padding */
double dx = 2.0 * entry->outline_width + entry->border_width;
cairo_translate(cr, dx + entry->padding_left, dx + entry->padding_top);
width -= 2 * dx + entry->padding_left + entry->padding_right;
height -= 2 * dx + entry->padding_top + entry->padding_bottom;
/* Account for rounded corners */
double inner_radius = (double)entry->corner_radius - dx;
inner_radius = MAX(inner_radius, 0);
dx = ceil(inner_radius * (1.0 - 1.0 / M_SQRT2));
cairo_translate(cr, dx, dx);
width -= 2 * dx;
height -= 2 * dx;
cairo_rectangle(cr, 0, 0, width, height);
cairo_clip(cr);
/* Setup the backend. */
if (access(entry->font_name, R_OK) != 0) {
/*
* We've been given a font name rather than path,
* so fallback to Pango
*/
entry->use_pango = true;
}
if (entry->use_pango) {
entry_backend_pango_init(entry, &width, &height);
} else {
entry_backend_harfbuzz_init(entry, &width, &height);
}
/* Store the clip rectangle width and height. */
cairo_matrix_t mat;
cairo_get_matrix(cr, &mat);
entry->clip_x = mat.x0;
entry->clip_y = mat.y0;
entry->clip_width = width;
entry->clip_height = height;
/*
* Perform an initial render of the text.
* This is done here rather than by calling entry_update to avoid the
* unnecessary cairo_paint() of the background for the first frame,
* which can be slow for large (e.g. fullscreen) windows.
*/
log_debug("Initial text render.\n");
if (entry->use_pango) {
entry_backend_pango_update(entry);
} else {
entry_backend_harfbuzz_update(entry);
}
entry->index = !entry->index;
/*
* To avoid performing all this drawing twice, we take a small
* shortcut. After performing all the drawing as normal on our first
* Cairo context, we can copy over just the important state (the
* transformation matrix and clip rectangle) and perform a memcpy()
* to initialise the other context.
*
* This memcpy can pretty expensive however, and isn't needed until
* we need to draw our second buffer (i.e. when the user presses a
* key). In order to minimise startup time, the memcpy() isn't
* performed here, but instead happens later, just after the first
* frame has been displayed on screen (and while the user is unlikely
* to press another key for the <10ms it takes to memcpy).
*/
cairo_set_matrix(entry->cairo[1].cr, &mat);
cairo_rectangle(entry->cairo[1].cr, 0, 0, width, height);
cairo_clip(entry->cairo[1].cr);
}
void entry_destroy(struct entry *entry)
{
if (entry->use_pango) {
entry_backend_pango_destroy(entry);
} else {
entry_backend_harfbuzz_destroy(entry);
}
cairo_destroy(entry->cairo[0].cr);
cairo_destroy(entry->cairo[1].cr);
cairo_surface_destroy(entry->cairo[0].surface);
cairo_surface_destroy(entry->cairo[1].surface);
}
void entry_update(struct entry *entry)
{
log_debug("Start rendering entry.\n");
cairo_t *cr = entry->cairo[entry->index].cr;
/* Clear the image. */
struct color color = entry->background_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_save(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
cairo_paint(cr);
cairo_restore(cr);
/* Draw our text. */
if (entry->use_pango) {
entry_backend_pango_update(entry);
} else {
entry_backend_harfbuzz_update(entry);
}
log_debug("Finish rendering entry.\n");
entry->index = !entry->index;
}
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