From 8a2124dc6dbed9d32eed037a4e00661848e689f6 Mon Sep 17 00:00:00 2001
From: Maxim Guryanov <guryanov@info74.ru>
Date: Wed, 21 Feb 2018 14:27:26 +0500
Subject: [PATCH 1/4] add: resize by any single dimension

---
 ngx_http_image_filter_module.c | 34 +++++++++++++++++++++-------------
 1 file changed, 21 insertions(+), 13 deletions(-)

diff --git a/ngx_http_image_filter_module.c b/ngx_http_image_filter_module.c
index f6d7439..876eb37 100644
--- a/ngx_http_image_filter_module.c
+++ b/ngx_http_image_filter_module.c
@@ -621,28 +621,36 @@ ngx_http_image_process(ngx_http_request_t *r)
         return ngx_http_image_resize(r, ctx);
     }
 	}
-	ctx->max_width = ngx_http_image_filter_get_value(r, conf->wcv, conf->width);
 
-    if (ctx->max_width == 0) {
+    ctx->max_width = ngx_http_image_filter_get_value(
+                                    r,
+                                    conf->wcv,
+                                    conf->width
+                            );
+
+    if (ctx->max_width == 0 &&
+        conf->filter != NGX_HTTP_IMAGE_RESIZE) {
         return NULL;
     }
 
-    ctx->max_height = ngx_http_image_filter_get_value(r, conf->hcv,
-                                                      conf->height);
-    if (ctx->max_height == 0) {
+    ctx->max_height = ngx_http_image_filter_get_value(
+                                    r,
+                                    conf->hcv,
+                                    conf->height
+                            );
+
+    if (ctx->max_height == 0 &&
+        conf->filter != NGX_HTTP_IMAGE_RESIZE) {
         return NULL;
     }
 
-    if (rc == NGX_OK
-        && ctx->width <= ctx->max_width
-        && ctx->height <= ctx->max_height
-        && ctx->angle == 0
-        && !ctx->force
-        && !conf->watermark.data)
-    {
-        return ngx_http_image_asis(r, ctx);
+    if (ctx->max_width == 0 && ctx->max_height == 0) {
+        return NULL;
     }
 
+    if(ctx->max_width == 0)  ctx->max_width =ctx->width;
+    if(ctx->max_height == 0) ctx->max_height=ctx->height;
+
     return ngx_http_image_resize(r, ctx);
 }
 

From e76225233a131133a9d61b1590db2d26a5793eb3 Mon Sep 17 00:00:00 2001
From: Maxim Guryanov <guryanov@info74.ru>
Date: Wed, 21 Feb 2018 14:59:28 +0500
Subject: [PATCH 2/4] add: crop by any single dimension

---
 ngx_http_image_filter_module.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/ngx_http_image_filter_module.c b/ngx_http_image_filter_module.c
index 876eb37..a2caaac 100644
--- a/ngx_http_image_filter_module.c
+++ b/ngx_http_image_filter_module.c
@@ -628,22 +628,12 @@ ngx_http_image_process(ngx_http_request_t *r)
                                     conf->width
                             );
 
-    if (ctx->max_width == 0 &&
-        conf->filter != NGX_HTTP_IMAGE_RESIZE) {
-        return NULL;
-    }
-
     ctx->max_height = ngx_http_image_filter_get_value(
                                     r,
                                     conf->hcv,
                                     conf->height
                             );
 
-    if (ctx->max_height == 0 &&
-        conf->filter != NGX_HTTP_IMAGE_RESIZE) {
-        return NULL;
-    }
-
     if (ctx->max_width == 0 && ctx->max_height == 0) {
         return NULL;
     }

From b841788efdbc0c23dbc87b72c04fbd62bfe5245c Mon Sep 17 00:00:00 2001
From: Maxim Guryanov <guryanov@info74.ru>
Date: Wed, 21 Feb 2018 16:01:51 +0500
Subject: [PATCH 3/4] chg: update README specification

---
 README.md | 42 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/README.md b/README.md
index 0cda677..5ae2da7 100644
--- a/README.md
+++ b/README.md
@@ -12,7 +12,7 @@ image_filter watermark;
 
 image_filter_watermark_width_from 300;
 image_filter_watermark_height_from 400;
-    
+
 image_filter_watermark "PATH_TO_FILE";
 image_filter_watermark_position center-center; # top-left|top-right|bottom-right|bottom-left|right-center|left-center|bottom-center|top-center|center-center|center-random`
 ```
@@ -77,3 +77,43 @@ Usage with resize and crop:
        image_filter_watermark_position center-center;
    }
 ```
+
+Resize and crop can omit any dimension value
+
+* For example, nginx locations configuration:
+
+```
+location /resize/ {
+    alias /path/to/backgraund/image;
+
+    image_filter resize $arg_w $arg_h;
+
+    image_filter_watermark /path/to/watermark/image;
+    image_filter_watermark_position center-center;
+}
+
+location /crop/ {
+    alias /path/to/backgraund/image;
+
+    image_filter crop $arg_w $arg_h;
+
+    image_filter_watermark /path/to/watermark/image;
+    image_filter_watermark_position center-center;
+}
+```
+
+* Requests with args:
+
+1. for proportionally reduces an image to the specified width
+
+```
+    http://localhost/resize/test.png?w=200
+    http://localhost/resize/test.png?w=200&h=-
+```
+
+2. for proportionally reduces an image to the width size and crops by height
+
+```
+    http://localhost/crop/test.png?h=250
+    http://localhost/crop/tets.png?w=-&h=250
+```

From eaba42ab8e372244a7486c5365e12f6cc5db2fe0 Mon Sep 17 00:00:00 2001
From: Maxim Guryanov <guryanov@info74.ru>
Date: Wed, 21 Feb 2018 16:49:06 +0500
Subject: [PATCH 4/4] fix: README grammar mistakes

---
 README.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/README.md b/README.md
index 5ae2da7..f5746ab 100644
--- a/README.md
+++ b/README.md
@@ -84,7 +84,7 @@ Resize and crop can omit any dimension value
 
 ```
 location /resize/ {
-    alias /path/to/backgraund/image;
+    alias /path/to/background/image;
 
     image_filter resize $arg_w $arg_h;
 
@@ -93,7 +93,7 @@ location /resize/ {
 }
 
 location /crop/ {
-    alias /path/to/backgraund/image;
+    alias /path/to/background/image;
 
     image_filter crop $arg_w $arg_h;