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fixes 90 degree rotation screenshots 

This fixes the screenshot example application when an output is rotated
by 90 degrees.
Other tranformations are not taken into account yet.
This commit is contained in:
Markus Ongyerth 2018-01-31 12:54:57 +01:00
parent 429f06d3f1
commit 4afc933ea4
1 changed files with 27 additions and 6 deletions
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25
examples/screenshot.c
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@ -48,6 +48,7 @@ struct screenshooter_output {
struct wl_output *output;
struct wl_buffer *buffer;
int width, height, offset_x, offset_y;
int transform;
void *data;
struct wl_list link;
};
@ -60,6 +61,7 @@ static void output_handle_geometry(void *data, struct wl_output *wl_output,
if (wl_output == output->output) {
output->offset_x = x;
output->offset_y = y;
output->transform = transform;
}
}
@ -163,11 +165,22 @@ static void write_image(const char *filename, int width, int height) {
void *d = data + (output->offset_y - min_y) * buffer_stride +
(output->offset_x - min_x) * 4;
if (output->transform == WL_OUTPUT_TRANSFORM_90) {
uint32_t *ss = s;
uint32_t *sd = d;
for (int i = 0; i < output->width; ++i) {
for (int j = 0; j < output->height; ++j) {
sd[i * width + j]
= ss[j * output->width + (output->width - i)];
}
}
} else {
for (int i = 0; i < output->height; i++) {
memcpy(d, s, output_stride);
d += buffer_stride;
s += output_stride;
}
}
free(output);
}
@ -211,15 +224,23 @@ static void write_image(const char *filename, int width, int height) {
}
static int set_buffer_size(int *width, int *height) {
int owidth, oheight;
min_x = min_y = INT_MAX;
max_x = max_y = INT_MIN;
struct screenshooter_output *output;
wl_list_for_each(output, &output_list, link) {
if (output->transform & 0x1) {
owidth = output->height;
oheight = output->width;
} else {
owidth = output->width;
oheight = output->height;
}
min_x = MIN(min_x, output->offset_x);
min_y = MIN(min_y, output->offset_y);
max_x = MAX(max_x, output->offset_x + output->width);
max_y = MAX(max_y, output->offset_y + output->height);
max_x = MAX(max_x, output->offset_x + owidth);
max_y = MAX(max_y, output->offset_y + oheight);
}
if (max_x <= min_x || max_y <= min_y) {