Using the png decoder demo but display an error picture
My code is here:
void app_main()
{
lv_init();
disp_spi_init();
ili9341_init();
static lv_color_t buf1[DISP_BUF_SIZE];
static lv_color_t buf2[DISP_BUF_SIZE];
static lv_disp_buf_t disp_buf;
lv_disp_buf_init(&disp_buf, buf1, buf2, DISP_BUF_SIZE);
lv_disp_drv_t disp_drv;
lv_disp_drv_init(&disp_drv);
disp_drv.flush_cb = ili9341_flush;
disp_drv.buffer = &disp_buf;
lv_disp_drv_register(&disp_drv);
esp_register_freertos_tick_hook(lv_tick_task);
LV_IMG_DECLARE(png_decoder_test); /*Declare the C array*/
uint32_t error; /*For the return values of png decoder functions*/
/*Decode the PNG image*/
unsigned char * png_decoded; /*Will be pointer to the decoded image*/
uint32_t png_width; /*Will be the width of the decoded image*/
uint32_t png_height; /*Will be the width of the decoded image*/
/*Decode the loaded image in ARGB8888 */
error = lodepng_decode32(&png_decoded, &png_width, &png_height, png_decoder_test.data, png_decoder_test.data_size);
if (error) {
printf("error %u: %s\n", error, lodepng_error_text(error));
while (1);
}
/*Initialize an image descriptor for LittlevGL with the decoded image*/
lv_img_dsc_t png_dsc;
png_dsc.header.always_zero = 0; /*It must be zero*/
png_dsc.header.cf = LV_IMG_CF_TRUE_COLOR_ALPHA; /*Set the color format*/
png_dsc.header.w = png_width;
png_dsc.header.h = png_height;
png_dsc.data_size = png_width * png_height * 4;
png_dsc.data = png_decoded;
/*Create an image object and set the decoded PNG image as it's source*/
lv_obj_t * img_obj = lv_img_create(lv_scr_act(), NULL); /*Create the an image object in LittlevGL*/
lv_img_set_src(img_obj, &png_dsc); /*Set the image source to the decoded PNG*/
lv_obj_set_drag(img_obj, true); /*Make to image dragable*/
/*Set a non-white background color for the scren to see the alpha is working on the image*/
lv_style_scr.body.main_color = LV_COLOR_MAKE(0x40, 0x70, 0xAA);
while (1) {
vTaskDelay(1);
lv_task_handler();
}
}
The original image is shown below
But my picture is shown as follows
Do not know why, if anyone would like to help me, many thanks!
Would anybody give a suggestion？
It’s weird. the same code works well on the pc-simulate project, but bot working on the esp32_ili9341 example.
@ kisvegabor @ embeddedt
We are always emailed about your posts. Please be patient. We have limited spare time in which to answer questions.
I havent looked at your code but it looks like it could be a driver/display issue, not necessarily an image issue. Have you tried just displaying a widget such as a button? might be worth doing that to prove if its a image issue or not.
It’s not a dirver issue, I try to display another imge, It works well.
see part1 and part2 of the picture blew：
If the blew code blew was encapsulated in a function, then call this function, the image will not display. This experiment was tested in PC-simulator project.
LV_IMG_DECLARE(png_decoder_test); /*Declare the C array*/
/*Decode the PNG image*/
unsigned char * png_decoded = NULL; /*Will be pointer to the decoded image*/
uint32_t png_width; /*Will be the width of the decoded image*/
uint32_t png_height; /*Will be the width of the decoded image*/
/*Decode the loaded image in ARGB8888 */
uint32_t error = lodepng_decode32(&png_decoded, &png_width, &png_height, png_decoder_test.data, png_decoder_test.data_size);
if (error) {
printf("error %u: %s\n", error, lodepng_error_text(error));
while (1);
}
printf("error: %d\n", error);
printf("%p\n", png_decoded);
printf("png_width:%d\n", png_width);
printf("png_height:%d\n", png_height);
/*Initialize an image descriptor for LittlevGL with the decoded image*/
lv_img_dsc_t png_dsc;
png_dsc.header.always_zero = 0; /*It must be zero*/
png_dsc.header.cf = LV_IMG_CF_TRUE_COLOR_ALPHA; /*Set the color format*/
png_dsc.header.w = png_width;
png_dsc.header.h = png_height;
png_dsc.data_size = png_width * png_height * 4;
png_dsc.data = png_decoded;
printf("png_dsc.data_size %d, png_dsc.data %p\n", png_dsc.data_size, png_dsc.data);
/*Create an image object and set the decoded PNG image as it's source*/
lv_obj_t * img_obj = lv_img_create(lv_scr_act(), NULL); /*Create the an image object in LittlevGL*/
lv_img_set_src(img_obj, &png_dsc); /*Set the image source to the decoded PNG*/
lv_obj_set_drag(img_obj, true); /*Make to image dragable*/
/*Set a non-white background color for the scren to see the alpha is working on the image*/
lv_style_scr.body.main_color = LV_COLOR_MAKE(0x40, 0x70, 0xAA);
@TheGrovesy please take a look.
It might be because the lv_img_dsc_t png_dsc is only within the scope of the function? What happen if you make it static?
Issue on PC-simulator project was solved, but I still have no clue about esp32_ili9341 problem.
Is the code in your device for setting up and showing the image exactly the same as the simulation? Are there any differences between the setup/displaying of the two images you showed in your last example where one displayed correctly?
@TheGrovesy they are amost the same, except the dirver.
Part 1 of the two images is the png decoder demo image want to display, part 2 is the png image convert by online tools(https://littlevgl.com/image-to-c-array) . It use to test the display dirver work or not.
blew is pc-simulator source code
main.c (7.6 KB)
The esp32_ili9341 source code here
main.c (3.7 KB)
please give some suggestions, thanks a lot!
I suggest not using lodepng directly. In the related blog post you find a ready to use decoder.
It can be used simply like this:
png_decoder_init();
LV_IMG_DECLARE(png_decoder_test);
lv_obj_t * img = lv_img_create(lv_scr_act(), NULL);
lv_img_set_src(img, &png_decoder_test);
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