diff --git a/vips.h b/vips.h index 0c819674..75845bc5 100644 --- a/vips.h +++ b/vips.h @@ -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; } } }