X-Git-Url: https://git.ao2.it/libam7xxx.git/blobdiff_plain/323d6d0521ae5a60d046df5945e076e7d07211ca..45ece994ef68250f4908fd51af730bfb98104848:/src/am7xxx.h?ds=inline diff --git a/src/am7xxx.h b/src/am7xxx.h index 79d960a..ec9869d 100644 --- a/src/am7xxx.h +++ b/src/am7xxx.h @@ -37,7 +37,7 @@ extern "C" { struct _am7xxx_context; typedef struct _am7xxx_context am7xxx_context; -/** +/** * @typedef am7xxx_device * * An opaque data type representing an am7xxx device. @@ -88,7 +88,7 @@ typedef enum { * An am7xxx device can operate in several power modes. A certain power mode * may have effect on the display brightness or on the device power * consumption. - * + * * @note Most am7xxx devices come with a Y-shaped USB cable with a Master and * a Slave connector, higher power modes may require that both connectors are * plugged in to the host system for the device to work properly. @@ -99,12 +99,30 @@ typedef enum { typedef enum { AM7XXX_POWER_OFF = 0, /**< Display is powered off, no image shown. */ AM7XXX_POWER_LOW = 1, /**< Low power consumption but also low brightness. */ - AM7XXX_POWER_MIDDLE = 2, /**< Middle level of brightness. */ + AM7XXX_POWER_MIDDLE = 2, /**< Middle level of brightness. This and upper modes need both the Master and Slave USB connectors plugged. */ AM7XXX_POWER_HIGH = 3, /**< More brightness, but more power consumption. */ - AM7XXX_POWER_TURBO = 4, /**< Max brightness and power consumprion. This may need both the Master and Slave USB connectors plugged. */ + AM7XXX_POWER_TURBO = 4, /**< Max brightness and power consumption. */ } 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. @@ -184,9 +202,9 @@ int am7xxx_get_device_info(am7xxx_device *dev, * Before sending images bigger than the device native dimensions the user * needs to rescale them, this utility function does the calculation in a way * that the original image aspect ratio is preserved. - * + * * @param[in] dev A pointer to the structure representing the device to get info of - * @param[in] upscale Whether to calculate scaled dimensions for images smaller than the native dimesions + * @param[in] upscale Whether to calculate scaled dimensions for images smaller than the native dimensions * @param[in] original_width The width of the original image * @param[in] original_height The height of the original image * @param[out] scaled_width The width the rescaled image should have @@ -201,7 +219,7 @@ int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev, unsigned int *scaled_width, unsigned int *scaled_height); /** - * Send an image for display on a am7xxx device. + * Send an image for display on an am7xxx device. * * This is the function that actually makes the device display something. * Static pictures can be sent just once and the device will keep showing them @@ -209,9 +227,9 @@ int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev, * * @param[in] dev A pointer to the structure representing the device to get info of * @param[in] format The format the image is in (see @link am7xxx_image_format @endlink enum) - * @param[in] width The width of the image + * @param[in] width The width of the image * @param[in] height The height of the image - * @param[in] image A buffer holding data in the format specified by the format parameter + * @param[in] image A buffer holding data in the format specified by the format parameter * @param[in] image_size The size in bytes of the image buffer * * @return 0 on success, a negative value on error @@ -224,19 +242,66 @@ int am7xxx_send_image(am7xxx_device *dev, unsigned int image_size); /** - * Set the power mode of an am7xxx device. + * Queue transfer of an image for display on an am7xxx device and return immediately. * - * \note If we set the mode to AM7XXX_POWER_OFF we can't turn the - * display on again by using only am7xxx_set_power_mode(). This needs to be - * investigated, maybe some other command can reset the device. + * This is the function that actually makes the device display something. + * Static pictures can be sent just once and the device will keep showing them + * until another image get sent or some command resets or turns off the display. + * + * @note This _async() variant makes a copy of the image buffer, so the caller + * is free to reuse the buffer just after the function returns. * * @param[in] dev A pointer to the structure representing the device to get info of - * @param[in] mode The power mode to put the device in (see @link am7xxx_power_mode @endlink enum) + * @param[in] format The format the image is in (see @link am7xxx_image_format @endlink enum) + * @param[in] width The width of the image + * @param[in] height The height of the image + * @param[in] image A buffer holding data in the format specified by the format parameter + * @param[in] image_size The size in bytes of the image buffer + * + * @return 0 on success, a negative value on error + */ +int am7xxx_send_image_async(am7xxx_device *dev, + am7xxx_image_format format, + unsigned int width, + unsigned int height, + unsigned char *image, + unsigned int image_size); + +/** + * Set the power mode of an am7xxx device. + * + * @note When setting the mode to AM7XXX_POWER_OFF the display can't be turned + * on again by using only am7xxx_set_power_mode(), am7xxx_set_zoom_mode() has + * to be called first, the current guess is that the latter performs some + * other resets beside setting the zoom mode. + * + * @param[in] dev A pointer to the structure representing the device to set power mode to + * @param[in] power The power mode to put the device in (see #am7xxx_power_mode enum) + * + * @return 0 on success, a negative value on error + * + */ +int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode power); + +/** + * 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_power_mode(am7xxx_device *dev, am7xxx_power_mode mode); +int am7xxx_set_zoom_mode(am7xxx_device *dev, am7xxx_zoom_mode zoom); #ifdef __cplusplus }