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Merge pull request #598 from Ongy/screenshot_transform

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Screenshot transform
This commit is contained in:
emersion 2018-02-01 21:41:15 +01:00 committed by GitHub
commit a43555d7f5
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 80 additions and 9 deletions
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87
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;
enum wl_output_transform 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;
}
}
@ -159,14 +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);
switch (output->transform) {
case WL_OUTPUT_TRANSFORM_NORMAL:
for (int i = 0; i < output->height; i++) {
memcpy(d, s, output_stride);
d += buffer_stride;
s += output_stride;
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 - 1 - j];
}
}
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 - 1 - 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 - 1 - j) * output->width + output->width - 1 - 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 - 1 - i) * output->width + output->width - 1 - 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 - 1 - 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 - 1 - 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);
@ -211,15 +274,23 @@ 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) {