picoproj: add a note about image dimensions and native resolution

[libam7xxx.git] / src / am7xxx.c

diff --git a/src/am7xxx.c b/src/am7xxx.c
index 6574100..8087f89 100644 (file)
--- a/src/am7xxx.c
+++ b/src/am7xxx.c
@@ -22,6 +22,7 @@
 #include <stdarg.h>
 #include <errno.h>
 #include <libusb.h>
 #include <stdarg.h>
 #include <errno.h>
 #include <libusb.h>

+#include <math.h>

 
 #include "am7xxx.h"
 #include "serialize.h"
 
 #include "am7xxx.h"
 #include "serialize.h"


@@ -35,6 +36,20 @@
 #  define  __attribute__(x)  /*NOTHING*/
 #endif
 
 #  define  __attribute__(x)  /*NOTHING*/
 #endif
 

+/* Control shared library symbols visibility */
+#if defined _WIN32 || defined __CYGWIN__
+       #define AM7XXX_PUBLIC __declspec(dllexport)
+       #define AM7XXX_LOCAL
+#else
+       #if __GNUC__ >= 4
+               #define AM7XXX_PUBLIC __attribute__ ((visibility ("default")))
+               #define AM7XXX_LOCAL  __attribute__ ((visibility ("hidden")))
+       #else
+               #define AM7XXX_PUBLIC
+               #define AM7XXX_LOCAL
+       #endif
+#endif
+

 static void log_message(am7xxx_context *ctx,
                        int level,
                        const char *function,
 static void log_message(am7xxx_context *ctx,
                        int level,
                        const char *function,


@@ -550,7 +565,9 @@ out:
        return ret;
 }
 
        return ret;
 }
 

-int am7xxx_init(am7xxx_context **ctx)
+/* Public API */
+
+AM7XXX_PUBLIC int am7xxx_init(am7xxx_context **ctx)

 {
        int ret = 0;
 
 {
        int ret = 0;
 


@@ -589,7 +606,7 @@ out:
        return ret;
 }
 
        return ret;
 }
 

-void am7xxx_shutdown(am7xxx_context *ctx)
+AM7XXX_PUBLIC void am7xxx_shutdown(am7xxx_context *ctx)

 {
        am7xxx_device *current;
 
 {
        am7xxx_device *current;
 


@@ -611,12 +628,12 @@ void am7xxx_shutdown(am7xxx_context *ctx)
        ctx = NULL;
 }
 
        ctx = NULL;
 }
 

-void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)
+AM7XXX_PUBLIC void am7xxx_set_log_level(am7xxx_context *ctx, am7xxx_log_level log_level)

 {
        ctx->log_level = log_level;
 }
 
 {
        ctx->log_level = log_level;
 }
 

-int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
+AM7XXX_PUBLIC int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,

                       unsigned int device_index)
 {
        int ret;
                       unsigned int device_index)
 {
        int ret;


@@ -638,7 +655,7 @@ int am7xxx_open_device(am7xxx_context *ctx, am7xxx_device **dev,
        return ret;
 }
 
        return ret;
 }
 

-int am7xxx_close_device(am7xxx_device *dev)
+AM7XXX_PUBLIC int am7xxx_close_device(am7xxx_device *dev)

 {
        if (dev == NULL) {
                fatal("dev must not be NULL!\n");
 {
        if (dev == NULL) {
                fatal("dev must not be NULL!\n");


@@ -652,7 +669,7 @@ int am7xxx_close_device(am7xxx_device *dev)
        return 0;
 }
 
        return 0;
 }
 

-int am7xxx_get_device_info(am7xxx_device *dev,
+AM7XXX_PUBLIC int am7xxx_get_device_info(am7xxx_device *dev,

                           am7xxx_device_info *device_info)
 {
        int ret;
                           am7xxx_device_info *device_info)
 {
        int ret;


@@ -691,7 +708,7 @@ int am7xxx_get_device_info(am7xxx_device *dev,
        return 0;
 }
 
        return 0;
 }
 

-int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
+AM7XXX_PUBLIC int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,

                                        unsigned int upscale,
                                        unsigned int original_width,
                                        unsigned int original_height,
                                        unsigned int upscale,
                                        unsigned int original_width,
                                        unsigned int original_height,


@@ -734,14 +751,14 @@ int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
                 */
                debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
                *scaled_width = device_info.native_width;
                 */
                debug(dev->ctx, "CASE 1, original image wider, adjust the scaled height\n");
                *scaled_width = device_info.native_width;

-               *scaled_height = (unsigned int)(original_height / width_ratio);
+               *scaled_height = (unsigned int)lroundf(original_height / width_ratio);

        } else if (width_ratio < height_ratio) {
                /*
                 * The input is proportionally "taller" than the device viewport
                 * so its width needs to be adjusted
                 */
                debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");
        } else if (width_ratio < height_ratio) {
                /*
                 * The input is proportionally "taller" than the device viewport
                 * so its width needs to be adjusted
                 */
                debug(dev->ctx, "CASE 2 original image taller, adjust the scaled width\n");

-               *scaled_width = (unsigned int)(original_width / height_ratio);
+               *scaled_width = (unsigned int)lroundf(original_width / height_ratio);

                *scaled_height = device_info.native_height;
        } else {
                debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");
                *scaled_height = device_info.native_height;
        } else {
                debug(dev->ctx, "CASE 3, just rescale, same aspect ratio already\n");


@@ -753,7 +770,7 @@ int am7xxx_calc_scaled_image_dimensions(am7xxx_device *dev,
        return 0;
 }
 
        return 0;
 }
 

-int am7xxx_send_image(am7xxx_device *dev,
+AM7XXX_PUBLIC int am7xxx_send_image(am7xxx_device *dev,

                      am7xxx_image_format format,
                      unsigned int width,
                      unsigned int height,
                      am7xxx_image_format format,
                      unsigned int width,
                      unsigned int height,


@@ -789,7 +806,7 @@ int am7xxx_send_image(am7xxx_device *dev,
        return send_data(dev, image, image_size);
 }
 
        return send_data(dev, image, image_size);
 }
 

-int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode)
+AM7XXX_PUBLIC int am7xxx_set_power_mode(am7xxx_device *dev, am7xxx_power_mode mode)

 {
        int ret;
        struct am7xxx_header h = {
 {
        int ret;
        struct am7xxx_header h = {