fix warings

src/lv_core/lv_obj.c

@@ -2929,6 +2929,7 @@ void * lv_obj_get_group(const lv_obj_t * obj)
 #if LV_USE_GROUP
     return obj->group_p;
 #else
+    LV_UNUSED(obj);
     return NULL;
 #endif
 }
@@ -2948,6 +2949,7 @@ bool lv_obj_is_focused(const lv_obj_t * obj)
     }
     return false;
 #else
+    LV_UNUSED(obj);
     return false;
 #endif
 }

src/lv_draw/lv_draw_label.c

@@ -758,7 +758,7 @@ static void draw_letter_subpx(lv_coord_t pos_x, lv_coord_t pos_y, lv_font_glyph_
             }
 
             /*Go to the next column*/
-            if(col_bit < 8 - bpp) {
+            if(col_bit < (int32_t) (8 - bpp)) {
                 col_bit += bpp;
                 bitmask = bitmask >> bpp;
             }
@@ -778,7 +778,7 @@ static void draw_letter_subpx(lv_coord_t pos_x, lv_coord_t pos_y, lv_font_glyph_
             }
         }
 
-        if((uint32_t) mask_p + (col_end - col_start) < mask_buf_size) {
+        if((int32_t) mask_p + (col_end - col_start) < mask_buf_size) {
             map_area.y2 ++;
         }
         else {

src/lv_draw/lv_draw_line.c

@@ -188,7 +188,7 @@ LV_ATTRIBUTE_FAST_MEM static void draw_line_hor(const lv_point_t * point1, const
             if(dashed) {
                 if(mask_res != LV_DRAW_MASK_RES_TRANSP) {
                     lv_style_int_t dash_cnt = dash_start;
-                    uint32_t i;
+                    lv_coord_t i;
                     for(i = 0; i < draw_area_w; i++, dash_cnt++) {
                         if(dash_cnt <= dsc->dash_width) {
                             int16_t diff = dsc->dash_width - dash_cnt;

src/lv_draw/lv_draw_rect.c

@@ -112,6 +112,9 @@ void lv_draw_rect(const lv_area_t * coords, const lv_area_t * clip, lv_draw_rect
  */
 void lv_draw_px(const lv_point_t * point, const lv_area_t * clip_area, const lv_style_t * style)
 {
+    LV_UNUSED(point);
+    LV_UNUSED(clip_area);
+    LV_UNUSED(style);
     //    lv_opa_t opa = style->body.opa;
     //    if(opa_scale != LV_OPA_COVER) opa = (opa * opa_scale) >> 8;
     //
@@ -811,7 +814,7 @@ LV_ATTRIBUTE_FAST_MEM static void draw_shadow(const lv_area_t * coords, const lv
     /*Invert the shadow corner buffer and draw the corners on the left*/
     sh_buf_tmp = sh_buf ;
     for(y = 0; y < corner_size; y++) {
-        uint32_t x;
+        int32_t x;
         for(x = 0; x < corner_size / 2; x++) {
             lv_opa_t tmp = sh_buf_tmp[x];
             sh_buf_tmp[x] = sh_buf_tmp[corner_size - x - 1];

src/lv_draw/lv_img_buf.c

@@ -523,6 +523,9 @@ void _lv_img_buf_get_transformed_area(lv_area_t * res, lv_coord_t w, lv_coord_t
     res->y1 = LV_MATH_MIN4(lb.y, lt.y, rb.y, rt.y);
     res->y2 = LV_MATH_MAX4(lb.y, lt.y, rb.y, rt.y);
 #else
+    LV_UNUSED(angle);
+    LV_UNUSED(zoom);
+    LV_UNUSED(pivot);
     res->x1 = 0;
     res->y1 = 0;
     res->x2 = w;

src/lv_draw/lv_img_decoder.c

@@ -568,6 +568,11 @@ static lv_res_t lv_img_decoder_built_in_line_true_color(lv_img_decoder_dsc_t * d
 
     return LV_RES_OK;
 #else
+    LV_UNUSED(dsc);
+    LV_UNUSED(x);
+    LV_UNUSED(y);
+    LV_UNUSED(len);
+    LV_UNUSED(buf);
     LV_LOG_WARN("Image built-in decoder cannot read file because LV_USE_FILESYSTEM = 0");
     return LV_RES_INV;
 #endif

src/lv_hal/lv_hal_disp.c

@@ -257,6 +257,7 @@ lv_coord_t lv_disp_get_ver_res(lv_disp_t * disp)
 bool lv_disp_get_antialiasing(lv_disp_t * disp)
 {
 #if LV_ANTIALIAS == 0
+    LV_UNUSED(disp);
     return false;
 #else
     if(disp == NULL) disp = lv_disp_get_default();
@@ -271,7 +272,7 @@ bool lv_disp_get_antialiasing(lv_disp_t * disp)
  * @param disp pointer to a display (NULL to use the default display)
  * @return dpi of the display
  */
-uint32_t lv_disp_get_dpi(lv_disp_t * disp)
+lv_coord_t lv_disp_get_dpi(lv_disp_t * disp)
 {
     if(disp == NULL) disp = lv_disp_get_default();
     if(disp == NULL) return LV_DPI;  /*Do not return 0 because it might be a divider*/

src/lv_hal/lv_hal_disp.h

@@ -255,7 +255,7 @@ bool lv_disp_get_antialiasing(lv_disp_t * disp);
  * @param disp pointer to a display (NULL to use the default display)
  * @return dpi of the display
  */
-uint32_t lv_disp_get_dpi(lv_disp_t * disp);
+lv_coord_t lv_disp_get_dpi(lv_disp_t * disp);
 
 /**
  * Get the size category of the display based on it's hor. res. and dpi.

src/lv_misc/lv_anim.c

@@ -224,6 +224,8 @@ void lv_anim_refr_now(void)
  */
 lv_anim_value_t lv_anim_path_linear(const lv_anim_path_t * path, const lv_anim_t * a)
 {
+    LV_UNUSED(path);
+
     /*Calculate the current step*/
     uint32_t step;
     if(a->time == a->act_time) {
@@ -250,6 +252,8 @@ lv_anim_value_t lv_anim_path_linear(const lv_anim_path_t * path, const lv_anim_t
  */
 lv_anim_value_t lv_anim_path_ease_in(const lv_anim_path_t * path, const lv_anim_t * a)
 {
+    LV_UNUSED(path);
+
     /*Calculate the current step*/
     uint32_t t;
     if(a->time == a->act_time)
@@ -274,6 +278,8 @@ lv_anim_value_t lv_anim_path_ease_in(const lv_anim_path_t * path, const lv_anim_
  */
 lv_anim_value_t lv_anim_path_ease_out(const lv_anim_path_t * path, const lv_anim_t * a)
 {
+    LV_UNUSED(path);
+
     /*Calculate the current step*/
 
     uint32_t t;
@@ -299,6 +305,8 @@ lv_anim_value_t lv_anim_path_ease_out(const lv_anim_path_t * path, const lv_anim
  */
 lv_anim_value_t lv_anim_path_ease_in_out(const lv_anim_path_t * path, const lv_anim_t * a)
 {
+    LV_UNUSED(path);
+
     /*Calculate the current step*/
 
     uint32_t t;
@@ -324,6 +332,8 @@ lv_anim_value_t lv_anim_path_ease_in_out(const lv_anim_path_t * path, const lv_a
  */
 lv_anim_value_t lv_anim_path_overshoot(const lv_anim_path_t * path, const lv_anim_t * a)
 {
+    LV_UNUSED(path);
+
     /*Calculate the current step*/
 
     uint32_t t;
@@ -350,6 +360,8 @@ lv_anim_value_t lv_anim_path_overshoot(const lv_anim_path_t * path, const lv_ani
  */
 lv_anim_value_t lv_anim_path_bounce(const lv_anim_path_t * path, const lv_anim_t * a)
 {
+    LV_UNUSED(path);
+
     /*Calculate the current step*/
     uint32_t t;
     if(a->time == a->act_time)
@@ -412,6 +424,8 @@ lv_anim_value_t lv_anim_path_bounce(const lv_anim_path_t * path, const lv_anim_t
  */
 lv_anim_value_t lv_anim_path_step(const lv_anim_path_t * path, const lv_anim_t * a)
 {
+    LV_UNUSED(path);
+
     if(a->act_time >= a->time)
         return a->end;
     else

src/lv_misc/lv_anim.h

@@ -83,7 +83,7 @@ typedef struct _lv_anim_t {
     lv_anim_path_t path;         /**< Describe the path (curve) of animations*/
     int32_t start;               /**< Start value*/
     int32_t end;                 /**< End value*/
-    uint32_t time;               /**< Animation time in ms*/
+    int32_t time;               /**< Animation time in ms*/
     int32_t act_time;            /**< Current time in animation. Set to negative to make delay.*/
     uint32_t playback_delay;     /**< Wait before play back*/
     uint32_t playback_time;      /**< Duration of playback animation*/

src/lv_misc/lv_color.h

@@ -459,6 +459,7 @@ LV_ATTRIBUTE_FAST_MEM static inline void lv_color_premult(lv_color_t c, uint8_t
     out[1] = (uint16_t) LV_COLOR_GET_G(c) * mix;
     out[2] = (uint16_t) LV_COLOR_GET_B(c) * mix;
 #else
+    (void) mix;
     /*Pre-multiplication can't be used with 1 bpp*/
     out[0] = LV_COLOR_GET_R(c);
     out[1] = LV_COLOR_GET_G(c);

src/lv_misc/lv_types.h

@@ -77,6 +77,8 @@ typedef uint32_t lv_uintptr_t;
  *      MACROS
  **********************/
 
+#define LV_UNUSED(x) ((void) x)
+
 #ifdef __cplusplus
 } /* extern "C" */
 #endif

src/lv_widgets/lv_bar.c

@@ -163,6 +163,7 @@ void lv_bar_set_value(lv_obj_t * bar, int16_t value, lv_anim_enable_t anim)
 
     if(ext->cur_value == new_value) return;
 #if LV_USE_ANIMATION == 0
+    LV_UNUSED(anim);
     ext->cur_value = new_value;
     lv_obj_invalidate(bar);
 #else
@@ -189,6 +190,7 @@ void lv_bar_set_start_value(lv_obj_t * bar, int16_t start_value, lv_anim_enable_
 
     if(ext->start_value == new_value) return;
 #if LV_USE_ANIMATION == 0
+    LV_UNUSED(anim);
     ext->start_value = new_value;
 #else
     lv_bar_set_value_with_anim(bar, new_value, &ext->start_value, &ext->start_value_anim, anim);

src/lv_widgets/lv_canvas.c

@@ -364,6 +364,15 @@ void lv_canvas_transform(lv_obj_t * canvas, lv_img_dsc_t * img, int16_t angle, u
 
     lv_obj_invalidate(canvas);
 #else
+    LV_UNUSED(canvas);
+    LV_UNUSED(img);
+    LV_UNUSED(angle);
+    LV_UNUSED(zoom);
+    LV_UNUSED(offset_x);
+    LV_UNUSED(offset_y);
+    LV_UNUSED(pivot_x);
+    LV_UNUSED(pivot_y);
+    LV_UNUSED(antialias);
     LV_LOG_WARN("LV_USE_IMG_TRANSFORM is disabled in lv_conf.h");
 #endif
 }
@@ -1009,7 +1018,7 @@ void lv_canvas_draw_polygon(lv_obj_t * canvas, const lv_point_t points[], uint32
     lv_disp_t * refr_ori = _lv_refr_get_disp_refreshing();
     _lv_refr_set_disp_refreshing(&disp);
 
-    //    lv_draw_polygon(points, point_cnt, &mask, poly_draw_dsc);
+    lv_draw_polygon(points, point_cnt, &mask, poly_draw_dsc);
 
     _lv_refr_set_disp_refreshing(refr_ori);
 

src/lv_widgets/lv_gauge.c

@@ -359,7 +359,7 @@ uint8_t lv_gauge_get_label_count(const lv_obj_t * gauge)
  * @return pointer to an `lv_img_dsc_t` variable or a path to an image
  *        (not an `lv_img` object). `NULL` if not used.
  */
-const void * lv_gauge_get_needle_img(lv_obj_t * gauge, const void * img, lv_coord_t pivot_x, lv_coord_t pivot_y)
+const void * lv_gauge_get_needle_img(lv_obj_t * gauge)
 {
     LV_ASSERT_OBJ(gauge, LV_OBJX_NAME);
 

src/lv_widgets/lv_gauge.h

@@ -246,7 +246,7 @@ static inline uint16_t lv_gauge_get_angle_offset(lv_obj_t * gauge)
  * @return pointer to an `lv_img_dsc_t` variable or a path to an image
  *        (not an `lv_img` object). `NULL` if not used.
  */
-const void * lv_gauge_get_needle_img(lv_obj_t * gauge, const void * img, lv_coord_t pivot_x, lv_coord_t pivot_y);
+const void * lv_gauge_get_needle_img(lv_obj_t * gauge);
 
 /**
  * Get the X coordinate of the rotation center of the needle image

src/lv_widgets/lv_label.c

@@ -1233,7 +1233,7 @@ static void lv_label_refr_text(lv_obj_t * label)
             lv_anim_set_playback_time(&a, a.time);
 
             lv_anim_t * anim_cur = lv_anim_get(label, (lv_anim_exec_xcb_t)lv_label_set_offset_x);
-            uint32_t act_time = 0;
+            int32_t act_time = 0;
             bool playback_now = false;
             if(anim_cur) {
                 act_time = anim_cur->act_time;
@@ -1268,7 +1268,7 @@ static void lv_label_refr_text(lv_obj_t * label)
             lv_anim_set_playback_time(&a, a.time);
 
             lv_anim_t * anim_cur = lv_anim_get(label, (lv_anim_exec_xcb_t)lv_label_set_offset_y);
-            uint32_t act_time = 0;
+            int32_t act_time = 0;
             bool playback_now = false;
             if(anim_cur) {
                 act_time = anim_cur->act_time;
@@ -1311,7 +1311,7 @@ static void lv_label_refr_text(lv_obj_t * label)
             lv_anim_set_time(&a, lv_anim_speed_to_time(ext->anim_speed, a.start, a.end));
 
             lv_anim_t * anim_cur = lv_anim_get(label, (lv_anim_exec_xcb_t)lv_label_set_offset_x);
-            uint32_t act_time = anim_cur ? anim_cur->act_time : 0;
+            int32_t act_time = anim_cur ? anim_cur->act_time : 0;
             if(act_time < a.time) {
                 a.act_time = act_time;      /*To keep the old position*/
                 a.early_apply = 0;
@@ -1332,7 +1332,7 @@ static void lv_label_refr_text(lv_obj_t * label)
             lv_anim_set_time(&a, lv_anim_speed_to_time(ext->anim_speed, a.start, a.end));
 
             lv_anim_t * anim_cur = lv_anim_get(label, (lv_anim_exec_xcb_t)lv_label_set_offset_y);
-            uint32_t act_time = anim_cur ? anim_cur->act_time : 0;
+            int32_t act_time = anim_cur ? anim_cur->act_time : 0;
             if(act_time < a.time) {
                 a.act_time = act_time;      /*To keep the old position*/
                 a.early_apply = 0;

src/lv_widgets/lv_page.c

@@ -654,7 +654,8 @@ void lv_page_start_edge_flash(lv_obj_t * page, lv_page_edge_t edge)
     }
 
 #else
-    (void)page; /*Unused*/
+    LV_UNUSED(page);
+    LV_UNUSED(edge);
 #endif
 }
 

src/lv_widgets/lv_spinbox.c

@@ -174,7 +174,7 @@ void lv_spinbox_set_digit_format(lv_obj_t * spinbox, uint8_t digit_count, uint8_
     if(separator_position > LV_SPINBOX_MAX_DIGIT_COUNT) separator_position = LV_SPINBOX_MAX_DIGIT_COUNT;
 
     if(digit_count < LV_SPINBOX_MAX_DIGIT_COUNT) {
-        uint64_t max_val = _lv_pow(10, digit_count);
+        int64_t max_val = _lv_pow(10, digit_count);
         if(ext->range_max > max_val - 1) ext->range_max = max_val - 1;
         if(ext->range_min < - max_val  + 1) ext->range_min = - max_val  + 1;
     }

src/lv_widgets/lv_tileview.c

@@ -152,6 +152,7 @@ lv_obj_t * lv_tileview_create(lv_obj_t * par, const lv_obj_t * copy)
  */
 void lv_tileview_add_element(lv_obj_t * tileview, lv_obj_t * element)
 {
+    LV_UNUSED(tileview);
     LV_ASSERT_OBJ(tileview, LV_OBJX_NAME);
     LV_ASSERT_NULL(tileview);
 

tests/Makefile

@@ -5,13 +5,11 @@ CC ?= gcc
 LVGL_DIR ?= ${shell pwd}/../..
 LVGL_DIR_NAME ?= lvgl
 
-WARNINGS ?= -Werror -Wall -Wextra \
-						-Wshadow -Wundef -Wmaybe-uninitialized -Wmissing-prototypes -Wno-discarded-qualifiers \
-						-Wno-unused-function -Wno-error=strict-prototypes -Wpointer-arith -fno-strict-aliasing -Wno-error=cpp -Wuninitialized \
-						-Wno-unused-parameter -Wno-missing-field-initializers -Wno-format-nonliteral -Wno-cast-qual -Wunreachable-code -Wno-switch-default  \
-					  -Wreturn-type -Wmultichar -Wformat-security -Wno-ignored-qualifiers -Wno-error=pedantic -Wno-sign-compare -Wno-error=missing-prototypes -Wdouble-promotion -Wclobbered -Wdeprecated  \
+WARNINGS = -Werror -Wall -Wextra \
+						-Wshadow -Wundef -Wmaybe-uninitialized -Wmissing-prototypes -Wpointer-arith -Wuninitialized \
+					 -Wunreachable-code -Wreturn-type -Wmultichar -Wformat-security -Wdouble-promotion -Wclobbered -Wdeprecated  \
 						-Wempty-body -Wshift-negative-value -Wstack-usage=2048 \
-            -Wtype-limits -Wsizeof-pointer-memaccess -Wpointer-arith
+            -Wtype-limits -Wsizeof-pointer-memaccess
 
 #-Wno-unused-value -Wno-unused-parameter 
 OPTIMIZATION ?= -O3 -g0

tests/build.py

@@ -11,7 +11,7 @@ optimization = '"-O3 -g0"'
 
 
 def build(name, defines):
-  global warnings, base_defines, optimization
+  global base_defines, optimization
 
   print("=============================")
   print(name)

tests/lv_test_assert.c

@@ -48,9 +48,9 @@ typedef struct {
  *  STATIC PROTOTYPES
  **********************/
 static void read_png_file(png_img_t * p, const char* file_name);
-static void write_png_file(png_img_t * p, const char* file_name);
+//static void write_png_file(png_img_t * p, const char* file_name);
 static void png_release(png_img_t * p);
-static void process_file(png_img_t * p);
+//static void process_file(png_img_t * p);
 
 /**********************
  *  STATIC VARIABLES
@@ -254,59 +254,59 @@ static void read_png_file(png_img_t * p, const char* file_name)
 
     fclose(fp);
 }
-
-
-static void write_png_file(png_img_t * p, const char* file_name)
-{
-    /* create file */
-    FILE *fp = fopen(file_name, "wb");
-    if (!fp)
-        lv_test_exit("[write_png_file] File %s could not be opened for writing", file_name);
-
-
-    /* initialize stuff */
-    p->png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-
-    if (!p->png_ptr)
-        lv_test_exit("[write_png_file] png_create_write_struct failed");
-
-    p->info_ptr = png_create_info_struct(p->png_ptr);
-    if (!p->info_ptr)
-        lv_test_exit("[write_png_file] png_create_info_struct failed");
-
-    if (setjmp(png_jmpbuf(p->png_ptr)))
-        lv_test_exit("[write_png_file] Error during init_io");
-
-    png_init_io(p->png_ptr, fp);
-
-
-    /* write header */
-    if (setjmp(png_jmpbuf(p->png_ptr)))
-        lv_test_exit("[write_png_file] Error during writing header");
-
-    png_set_IHDR(p->png_ptr, p->info_ptr, p->width, p->height,
-            p->bit_depth, p->color_type, PNG_INTERLACE_NONE,
-            PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
-
-    png_write_info(p->png_ptr, p->info_ptr);
-
-
-    /* write bytes */
-    if (setjmp(png_jmpbuf(p->png_ptr)))
-        lv_test_exit("[write_png_file] Error during writing bytes");
-
-    png_write_image(p->png_ptr, p->row_pointers);
-
-
-    /* end write */
-    if (setjmp(png_jmpbuf(p->png_ptr)))
-        lv_test_exit("[write_png_file] Error during end of write");
-
-    png_write_end(p->png_ptr, NULL);
-
-    fclose(fp);
-}
-
+//
+//
+//static void write_png_file(png_img_t * p, const char* file_name)
+//{
+//    /* create file */
+//    FILE *fp = fopen(file_name, "wb");
+//    if (!fp)
+//        lv_test_exit("[write_png_file] File %s could not be opened for writing", file_name);
+//
+//
+//    /* initialize stuff */
+//    p->png_ptr = png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+//
+//    if (!p->png_ptr)
+//        lv_test_exit("[write_png_file] png_create_write_struct failed");
+//
+//    p->info_ptr = png_create_info_struct(p->png_ptr);
+//    if (!p->info_ptr)
+//        lv_test_exit("[write_png_file] png_create_info_struct failed");
+//
+//    if (setjmp(png_jmpbuf(p->png_ptr)))
+//        lv_test_exit("[write_png_file] Error during init_io");
+//
+//    png_init_io(p->png_ptr, fp);
+//
+//
+//    /* write header */
+//    if (setjmp(png_jmpbuf(p->png_ptr)))
+//        lv_test_exit("[write_png_file] Error during writing header");
+//
+//    png_set_IHDR(p->png_ptr, p->info_ptr, p->width, p->height,
+//            p->bit_depth, p->color_type, PNG_INTERLACE_NONE,
+//            PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
+//
+//    png_write_info(p->png_ptr, p->info_ptr);
+//
+//
+//    /* write bytes */
+//    if (setjmp(png_jmpbuf(p->png_ptr)))
+//        lv_test_exit("[write_png_file] Error during writing bytes");
+//
+//    png_write_image(p->png_ptr, p->row_pointers);
+//
+//
+//    /* end write */
+//    if (setjmp(png_jmpbuf(p->png_ptr)))
+//        lv_test_exit("[write_png_file] Error during end of write");
+//
+//    png_write_end(p->png_ptr, NULL);
+//
+//    fclose(fp);
+//}
+//
 static void png_release(png_img_t * p)
 {
     int y;
@@ -314,30 +314,30 @@ static void png_release(png_img_t * p)
           free(p->row_pointers[y]);
       free(p->row_pointers);
 }
-
-static void process_file(png_img_t * p)
-{
-    if (png_get_color_type(p->png_ptr, p->info_ptr) == PNG_COLOR_TYPE_RGB)
-        lv_test_exit("[process_file] input file is PNG_COLOR_TYPE_RGB but must be PNG_COLOR_TYPE_RGBA "
-                "(lacks the alpha channel)");
-
-    if (png_get_color_type(p->png_ptr, p->info_ptr) != PNG_COLOR_TYPE_RGBA)
-        lv_test_exit("[process_file] color_type of input file must be PNG_COLOR_TYPE_RGBA (%d) (is %d)",
-                PNG_COLOR_TYPE_RGBA, png_get_color_type(p->png_ptr, p->info_ptr));
-
-    int x, y;
-    for (y=0; y<p->height; y++) {
-        png_byte* row = p->row_pointers[y];
-        for (x=0; x<p->width; x++) {
-            png_byte* ptr = &(row[x*4]);
-            printf("Pixel at position [ %d - %d ] has RGBA values: %d - %d - %d - %d\n",
-                    x, y, ptr[0], ptr[1], ptr[2], ptr[3]);
-
-            /* set red value to 0 and green value to the blue one */
-            ptr[0] = 0;
-            ptr[1] = ptr[2];
-        }
-    }
-}
+//
+//static void process_file(png_img_t * p)
+//{
+//    if (png_get_color_type(p->png_ptr, p->info_ptr) == PNG_COLOR_TYPE_RGB)
+//        lv_test_exit("[process_file] input file is PNG_COLOR_TYPE_RGB but must be PNG_COLOR_TYPE_RGBA "
+//                "(lacks the alpha channel)");
+//
+//    if (png_get_color_type(p->png_ptr, p->info_ptr) != PNG_COLOR_TYPE_RGBA)
+//        lv_test_exit("[process_file] color_type of input file must be PNG_COLOR_TYPE_RGBA (%d) (is %d)",
+//                PNG_COLOR_TYPE_RGBA, png_get_color_type(p->png_ptr, p->info_ptr));
+//
+//    int x, y;
+//    for (y=0; y<p->height; y++) {
+//        png_byte* row = p->row_pointers[y];
+//        for (x=0; x<p->width; x++) {
+//            png_byte* ptr = &(row[x*4]);
+//            printf("Pixel at position [ %d - %d ] has RGBA values: %d - %d - %d - %d\n",
+//                    x, y, ptr[0], ptr[1], ptr[2], ptr[3]);
+//
+//            /* set red value to 0 and green value to the blue one */
+//            ptr[0] = 0;
+//            ptr[1] = ptr[2];
+//        }
+//    }
+//}
 #endif
 

tests/lv_test_main.c

@@ -40,6 +40,8 @@ static void hal_init(void)
 
 static void dummy_flush_cb(lv_disp_drv_t * disp_drv, const lv_area_t * area, lv_color_t * color_p)
 {
+    LV_UNUSED(area);
+    LV_UNUSED(color_p);
     lv_disp_flush_ready(disp_drv);
 }