Use ImageMagick to write PNG screenshot
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a87f016017
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@ -27,6 +27,7 @@
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#include <stdlib.h>
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#include <string.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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@ -184,7 +185,7 @@ static void argb_to_rgba(uint32_t *data, size_t height, size_t stride) {
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}
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static void
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write_png(int width, int height)
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write_image(const char *filename, int width, int height)
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{
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int output_stride, buffer_stride, i;
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void *data, *d, *s;
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@ -213,12 +214,33 @@ write_png(int width, int height)
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argb_to_rgba(data, height, buffer_stride);
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// TODO: call convert
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FILE *f = fopen("wayland-screenshot", "w");
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fwrite(data, buffer_stride * height, 1, f);
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fclose(f);
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char size[10 + 1 + 10 + 2 + 1]; // int32_t are max 10 digits
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sprintf(size, "%dx%d+0", width, height);
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free(data);
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int fd[2];
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pipe(fd);
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pid_t child = fork();
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if (child < 0) {
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fprintf(stderr, "fork() failed\n");
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exit(EXIT_FAILURE);
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} else if (child != 0) {
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close(fd[0]);
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write(fd[1], data, buffer_stride * height);
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close(fd[1]);
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free(data);
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waitpid(child, NULL, 0);
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} else {
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close(fd[1]);
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if (dup2(fd[0], 0) != 0) {
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fprintf(stderr, "cannot dup the pipe\n");
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}
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close(fd[0]);
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execlp("convert", "convert", "-depth", "8", "-size", size, "rgba:-",
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"-alpha", "opaque", filename, NULL);
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fprintf(stderr, "cannot execute convert\n");
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exit(EXIT_FAILURE);
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}
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}
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static int
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@ -296,7 +318,6 @@ int main(int argc, char *argv[])
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wl_display_roundtrip(display);
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}
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write_png(width, height);
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return 0;
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write_image("wayland-screenshot.png", width, height);
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return EXIT_SUCCESS;
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}
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