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#include <cairo/cairo.h>
#include <wchar.h>
#include "entry.h"
#include "log.h"
#include "nelem.h"
void entry_init(struct entry *entry, uint8_t *restrict buffer, uint32_t width, uint32_t height, uint32_t scale)
{
entry->image.width = width;
entry->image.height = height;
entry->image.scale = scale;
/*
* 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_surface_set_device_scale(surface, scale, scale);
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)
);
cairo_surface_set_device_scale(entry->cairo[1].surface, scale, scale);
entry->cairo[1].cr = cairo_create(entry->cairo[1].surface);
/*
* Cairo drawing operations take the scale into account,
* so we account for that here.
*/
width /= scale;
height /= scale;
/* Draw the outer outline */
struct color color = entry->border.outline_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_set_line_width(cr, 2 * entry->border.outline_width);
cairo_rectangle(cr, 0, 0, width, height);
cairo_stroke(cr);
/* Move and clip following draws to be within this outline */
cairo_translate(
cr,
entry->border.outline_width,
entry->border.outline_width);
width -= 2 * entry->border.outline_width;
height -= 2 * entry->border.outline_width;
cairo_rectangle(cr, 0, 0, width, height);
cairo_clip(cr);
/* Draw the border */
color = entry->border.color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_set_line_width(cr, 2 * entry->border.width);
cairo_rectangle(cr, 0, 0, width, height);
cairo_stroke(cr);
/* Move and clip following draws to be within the border */
cairo_translate(cr, entry->border.width, entry->border.width);
width -= 2 * entry->border.width;
height -= 2 * entry->border.width;
cairo_rectangle(cr, 0, 0, width, height);
cairo_clip(cr);
/* Draw the inner outline */
color = entry->border.outline_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_set_line_width(cr, 2 * entry->border.outline_width);
cairo_rectangle(cr, 0, 0, width, height);
cairo_stroke(cr);
/* Move and clip following draws to be within this outline */
cairo_translate(
cr,
entry->border.outline_width,
entry->border.outline_width);
width -= 2 * entry->border.outline_width;
height -= 2 * entry->border.outline_width;
cairo_rectangle(cr, 0, 0, width, height);
cairo_clip(cr);
/* Draw the entry background */
color = entry->background_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_paint(cr);
/* Move and clip following draws to be within the specified padding */
cairo_translate(cr, entry->padding, entry->padding);
width -= 2 * entry->padding;
height -= 2 * entry->padding;
cairo_rectangle(cr, 0, 0, width, height);
cairo_clip(cr);
/* Setup the backend. */
entry_backend_init(entry, &width, &height, scale);
/*
* 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_matrix_t mat;
cairo_get_matrix(cr, &mat);
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)
{
entry_backend_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;
cairo_save(cr);
/* Clear the image. */
struct color color = entry->background_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
cairo_paint(cr);
/* Draw our text. */
color = entry->foreground_color;
cairo_set_source_rgba(cr, color.r, color.g, color.b, color.a);
entry_backend_update(entry);
cairo_restore(cr);
log_debug("Finish rendering entry.\n");
entry->index = !entry->index;
}
void entry_set_scale(struct entry *entry, uint32_t scale)
{
entry->image.scale = scale;
cairo_surface_set_device_scale(entry->cairo[0].surface, scale, scale);
cairo_surface_set_device_scale(entry->cairo[1].surface, scale, scale);
}
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