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handle the other transformations for screenshots 

This handles all current transformations for outputs properly.
This ensures an output is drawn in readable orientation/flipping no
matter the actual transformations applied to it.
This commit is contained in:
Markus Ongyerth 2018-01-31 16:05:33 +01:00
parent 4afc933ea4
commit 3a404e4f8d
1 changed files with 66 additions and 16 deletions
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82
examples/screenshot.c
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@ -48,7 +48,7 @@ struct screenshooter_output {
struct wl_output *output;
struct wl_buffer *buffer;
int width, height, offset_x, offset_y;
int transform;
enum wl_output_transform transform;
void *data;
struct wl_list link;
};
@ -161,25 +161,75 @@ static void write_image(const char *filename, int width, int height) {
struct screenshooter_output *output, *next;
wl_list_for_each_safe(output, next, &output_list, link) {
int output_stride = output->width * 4;
void *s = output->data;
void *d = data + (output->offset_y - min_y) * buffer_stride +
(output->offset_x - min_x) * 4;
uint32_t *src = (uint32_t *)output->data;
uint32_t *dst = (uint32_t *)(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)];
switch (output->transform) {
case WL_OUTPUT_TRANSFORM_NORMAL:
for (int i = 0; i < output->height; i++) {
memcpy(dst, src, output_stride);
dst += width;
src += output->width;
}
break;
case WL_OUTPUT_TRANSFORM_FLIPPED:
for (int i = 0; i < output->height; ++i) {
for (int j = 0; j < output->width; ++j) {
dst[i * width + j] =
src[i * output->width + output->width - j];
}
}
} else {
for (int i = 0; i < output->height; i++) {
memcpy(d, s, output_stride);
d += buffer_stride;
s += output_stride;
break;
case WL_OUTPUT_TRANSFORM_90:
for (int i = 0; i < output->width; ++i) {
for (int j = 0; j < output->height; ++j) {
dst[i * width + j] =
src[j * output->width + output->width - i];
}
}
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_90:
for (int i = 0; i < output->width; ++i) {
for (int j = 0; j < output->height; ++j) {
dst[i * width + j] =
src[(output->height - j) * output->width + output->width - i];
}
}
break;
case WL_OUTPUT_TRANSFORM_180:
for (int i = 0; i < output->height; ++i) {
for (int j = 0; j < output->width; ++j) {
dst[i * width + j] =
src[(output->height - i) * output->width + output->width - j];
}
}
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_180:
for (int i = 0; i < output->height; ++i) {
for (int j = 0; j < output->width; ++j) {
dst[i * width + j] =
src[(output->height - i) * output->width + j];
}
}
break;
case WL_OUTPUT_TRANSFORM_270:
for (int i = 0; i < output->width; ++i) {
for (int j = 0; j < output->height; ++j) {
dst[i * width + j] =
src[(output->height - j) * output->width + i];
}
}
break;
case WL_OUTPUT_TRANSFORM_FLIPPED_270:
for (int i = 0; i < output->width; ++i) {
for (int j = 0; j < output->height; ++j) {
dst[i * width + j] =
src[j * output->width + i];
}
}
break;
}
free(output);