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Autorotate/flip image according to EXIF orientation tag

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This commit is contained in:
DarthSim 2017-10-06 00:12:02 +06:00
parent be37095133
commit c4d1f4b54f
1 changed files with 51 additions and 3 deletions
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54
vips.h
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@ -8,6 +8,8 @@
#define VIPS_SUPPORT_GIF \
VIPS_MAJOR_VERSION > 8 || (VIPS_MAJOR_VERSION == 8 && VIPS_MINOR_VERSION >= 3)
#define EXIF_ORIENTATION "exif-ifd0-Orientation"
enum types {
JPEG = 0,
PNG,
@ -97,6 +99,46 @@ vips_webpload_buffer_go(void *buf, size_t len, VipsImage **out, int random) {
return vips_webpload_buffer(buf, len, out, "access", access_mode(random), NULL);
}
int
vips_get_exif_orientation(VipsImage *image) {
const char *orientation;
if (
vips_image_get_typeof(image, EXIF_ORIENTATION) != 0 &&
!vips_image_get_string(image, EXIF_ORIENTATION, &orientation)
) return atoi(&orientation[0]);
return 1;
}
int
vips_exif_rotate(VipsImage **img, int orientation) {
int err;
int angle = VIPS_ANGLE_D0;
gboolean flip = FALSE;
VipsImage *tmp;
if (orientation == 3 || orientation == 4) angle = VIPS_ANGLE_D180;
if (orientation == 5 || orientation == 6) angle = VIPS_ANGLE_D90;
if (orientation == 7 || orientation == 8) angle = VIPS_ANGLE_D270;
if (orientation == 2 || orientation == 4 || orientation == 5 || orientation == 7) {
flip = TRUE;
}
err = vips_rot(*img, &tmp, angle, NULL);
swap_and_clear(img, tmp);
if (err > 0) { return err; }
if (flip) {
err = vips_flip(*img, &tmp, VIPS_DIRECTION_HORIZONTAL, NULL);
swap_and_clear(img, tmp);
if (err > 0) { return err; }
}
return 0;
}
int
vips_resize_go(VipsImage *in, VipsImage **out, double scale) {
return vips_resize(in, out, scale, NULL);
@ -135,21 +177,27 @@ vips_process_image(VipsImage **img, int resize, double scale, int crop, int smar
VipsImage *tmp;
int err;
int exif_orientation = vips_get_exif_orientation(*img);
if (exif_orientation > 1) {
vips_exif_rotate(img, exif_orientation);
if (err > 0) { return 1; }
}
if (resize > 0) {
err = vips_resize_go(*img, &tmp, scale);
swap_and_clear(img, tmp);
if (err> 0) { return 1; }
if (err > 0) { return 1; }
}
if (crop > 0) {
if (smart > 0) {
err = vips_smartcrop_go(*img, &tmp, width, height);
swap_and_clear(img, tmp);
if (err> 0) { return 1; }
if (err > 0) { return 1; }
} else {
vips_extract_area_go(*img, &tmp, left, top, width, height);
swap_and_clear(img, tmp);
if (err> 0) { return 1; }
if (err > 0) { return 1; }
}
}