X-Git-Url: https://git.ao2.it/libam7xxx.git/blobdiff_plain/9f782560906451c1d059b456db80de6857db7c86..90247e36e90bebe6c8b80393d2a037b054808597:/src/am7xxx.h

diff --git a/src/am7xxx.h b/src/am7xxx.h
index 51f9324..885cef2 100644
--- a/src/am7xxx.h
+++ b/src/am7xxx.h
@@ -105,6 +105,24 @@ typedef enum {
 } am7xxx_power_mode;
 
 /**
+ * The display zoom modes.
+ *
+ * An am7xxx device can display images using several zoom modes.
+ *
+ * @note Changing the zoom mode can change the aspect ratio of the displayed
+ * image.
+ *
+ * @note On the zoom test screen the version of the firmware running on the
+ * device is shown as well (e.g SPI_V21.0.0_2011.03.18).
+ */
+typedef enum {
+	AM7XXX_ZOOM_ORIGINAL = 0, /**< Original Size, as retrieved via #am7xxx_device_info. */
+	AM7XXX_ZOOM_H        = 1, /**< Zoom 1: H Scale (changes aspect ratio). */
+	AM7XXX_ZOOM_H_V      = 2, /**< Zoom 2: H/V Scale (changes aspect ratio). */
+	AM7XXX_ZOOM_TEST     = 3, /**< Zoom test screen, the firmware version is shown as well. */
+} am7xxx_zoom_mode;
+
+/**
  * Initialize the library context and data structures, and scan for devices.
  *
  * @param[out] ctx A pointer to the context the library will be used in.
@@ -238,6 +256,26 @@ int am7xxx_send_image(am7xxx_device *dev,
  */
 int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode);
 
+/**
+ * Set the zoom mode of an am7xxx device.
+ *
+ * @note When setting the mode to AM7XXX_ZOOM_TEST, the calling program might
+ * want to skip displaying actual images.
+ *
+ * @note It looks like that power mode and zoom mode are related somehow wrt.
+ * resetting the operational mode after AM7XXX_POWER_OFF, applications can
+ * restore the display properly using this combination:
+ *  - Off: power mode 0, zoom mode 3
+ *  - On: power mode != 0, zoom mode != 3
+ *
+ * @param[in] dev A pointer to the structure representing the device to set zoom mode to
+ * @param[in] zoom The zoom mode to put the device in (see #am7xxx_zoom_mode enum)
+ *
+ * @return 0 on success, a negative value on error
+ *
+ */
+int am7xxx_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom);
+
 #ifdef __cplusplus
 }
 #endif