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#include <assert.h>
#include <stdio.h>
#include "buffer.h"
#include "output-layout.h"
#include "render.h"
static bool convert_buffer(struct grim_buffer *buffer) {
// Formats are little-endian
switch (buffer->format) {
case WL_SHM_FORMAT_ARGB8888:
case WL_SHM_FORMAT_XRGB8888:
// Natively supported by Cairo
return true;
case WL_SHM_FORMAT_ABGR8888:
case WL_SHM_FORMAT_XBGR8888:;
// ABGR -> ARGB
uint8_t *data = buffer->data;
for (int i = 0; i < buffer->height; ++i) {
for (int j = 0; j < buffer->width; ++j) {
uint32_t *px = (uint32_t *)(data + i * buffer->stride + j * 4);
uint8_t a = (*px >> 24) & 0xFF;
uint8_t b = (*px >> 16) & 0xFF;
uint8_t g = (*px >> 8) & 0xFF;
uint8_t r = *px & 0xFF;
*px = (a << 24) | (r << 16) | (g << 8) | b;
}
}
if (buffer->format == WL_SHM_FORMAT_ABGR8888) {
buffer->format = WL_SHM_FORMAT_ARGB8888;
} else {
buffer->format = WL_SHM_FORMAT_XRGB8888;
}
return true;
default:
fprintf(stderr, "unsupported format %d\n", buffer->format);
return false;
}
assert(false);
}
static cairo_format_t get_cairo_format(enum wl_shm_format wl_fmt) {
switch (wl_fmt) {
case WL_SHM_FORMAT_ARGB8888:
return CAIRO_FORMAT_ARGB32;
case WL_SHM_FORMAT_XRGB8888:
return CAIRO_FORMAT_RGB24;
default:
return CAIRO_FORMAT_INVALID;
}
assert(false);
}
cairo_surface_t *render(struct grim_state *state, struct grim_box *geometry,
double scale) {
cairo_surface_t *surface = cairo_image_surface_create(CAIRO_FORMAT_ARGB32,
geometry->width * scale, geometry->height * scale);
cairo_t *cairo = cairo_create(surface);
// Clear
cairo_save(cairo);
cairo_set_source_rgba(cairo, 0, 0, 0, 0);
cairo_set_operator(cairo, CAIRO_OPERATOR_SOURCE);
cairo_paint(cairo);
cairo_restore(cairo);
struct grim_output *output;
wl_list_for_each(output, &state->outputs, link) {
struct grim_buffer *buffer = output->buffer;
if (buffer == NULL) {
continue;
}
if (!convert_buffer(buffer)) {
return NULL;
}
cairo_format_t cairo_fmt = get_cairo_format(buffer->format);
assert(cairo_fmt != CAIRO_FORMAT_INVALID);
int32_t output_x = output->logical_geometry.x - geometry->x;
int32_t output_y = output->logical_geometry.y - geometry->y;
int32_t output_width = output->logical_geometry.width;
int32_t output_height = output->logical_geometry.height;
int32_t raw_output_width = output->geometry.width;
int32_t raw_output_height = output->geometry.height;
apply_output_transform(output->transform,
&raw_output_width, &raw_output_height);
int output_flipped_x = get_output_flipped(output->transform);
int output_flipped_y = output->screencopy_frame_flags &
ZWLR_SCREENCOPY_FRAME_V1_FLAGS_Y_INVERT ? -1 : 1;
cairo_surface_t *output_surface = cairo_image_surface_create_for_data(
buffer->data, cairo_fmt, buffer->width, buffer->height,
buffer->stride);
cairo_pattern_t *output_pattern =
cairo_pattern_create_for_surface(output_surface);
// All transformations are in pattern-local coordinates
cairo_matrix_t matrix;
cairo_matrix_init_identity(&matrix);
cairo_matrix_translate(&matrix,
(double)output->geometry.width / 2,
(double)output->geometry.height / 2);
cairo_matrix_rotate(&matrix, -get_output_rotation(output->transform));
cairo_matrix_scale(&matrix,
(double)raw_output_width / output_width * output_flipped_x,
(double)raw_output_height / output_height * output_flipped_y);
cairo_matrix_translate(&matrix,
-(double)output_width / 2,
-(double)output_height / 2);
cairo_matrix_translate(&matrix, -output_x, -output_y);
cairo_matrix_scale(&matrix, 1 / scale, 1 / scale);
cairo_pattern_set_matrix(output_pattern, &matrix);
cairo_pattern_set_filter(output_pattern, CAIRO_FILTER_BEST);
cairo_set_source(cairo, output_pattern);
cairo_pattern_destroy(output_pattern);
cairo_paint(cairo);
cairo_surface_destroy(output_surface);
}
cairo_destroy(cairo);
return surface;
}
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