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fixes 90 degree rotation screenshots

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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_output *output;
struct wl_buffer *buffer; struct wl_buffer *buffer;
int width, height, offset_x, offset_y; int width, height, offset_x, offset_y;
int transform;
void *data; void *data;
struct wl_list link; 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) { if (wl_output == output->output) {
output->offset_x = x; output->offset_x = x;
output->offset_y = y; 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 + void *d = data + (output->offset_y - min_y) * buffer_stride +
(output->offset_x - min_x) * 4; (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++) { for (int i = 0; i < output->height; i++) {
memcpy(d, s, output_stride); memcpy(d, s, output_stride);
d += buffer_stride; d += buffer_stride;
s += output_stride; s += output_stride;
} }
}
free(output); 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) { static int set_buffer_size(int *width, int *height) {
int owidth, oheight;
min_x = min_y = INT_MAX; min_x = min_y = INT_MAX;
max_x = max_y = INT_MIN; max_x = max_y = INT_MIN;
struct screenshooter_output *output; struct screenshooter_output *output;
wl_list_for_each(output, &output_list, link) { 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_x = MIN(min_x, output->offset_x);
min_y = MIN(min_y, output->offset_y); min_y = MIN(min_y, output->offset_y);
max_x = MAX(max_x, output->offset_x + output->width); max_x = MAX(max_x, output->offset_x + owidth);
max_y = MAX(max_y, output->offset_y + output->height); max_y = MAX(max_y, output->offset_y + oheight);
} }
if (max_x <= min_x || max_y <= min_y) { if (max_x <= min_x || max_y <= min_y) {