Image is not fully rendered

[Blueforcer]

I have a very strange phenomenon. I am rendering an image on a 32x8 WS2812 RGB matrix with this lib and RGB565 output format . Rendering 8x8 works great. but as soon as i try a 32x8 image only 16x8 is rendered.

I have already tried to debug something: While struct JDEC in jd_prepare recognizes 32 as image width, JRECT in mcu_output has only a "right" of 15. Accordingly, the image is rendered only half in width.

Is there a possible limitation of the aspect ratio?

[Bodmer]

There is no width or height restriction in the library for this case.

The problem is likely to be in the sketch. Note that the image will be rendered as a series of MCU blocks, typically 8x8 or 16x16 pixels.

Post the rendering sketch.

[Blueforcer]

Complete sketch?

here is only the rendering from the callback. the width parameter is 16 instead of 32

bool jpg_output(int16_t x, int16_t y, uint16_t w, uint16_t h, uint16_t *bitmap)  
{  
    uint16_t bitmapIndex = 0;  
    for (uint16_t row = 0; row < h; row++)  
    {  
        for (uint16_t col = 0; col < w; col++)  
        {  
            matrix->drawPixel(x + col, y + row, bitmap[bitmapIndex++]);  
        }  
    }  
    return 0;  
}  

[Bodmer]

A complete sketch helps as in some cases the problem is not where it is thought to be.

Maybe the display is configured to be 8 x 32 instead of 32 x 8?

Some simple test code could verify this.

[Bodmer]

Assumed resolved.