Problem disabling bitmap tiling in emWin

Josh123 · Mar 4th 2021, 7:25am

Hello,

I am having trouble disabling tiling for a certain bitmap in my application.
The attached images displays the following:
- Here is the bitmap being drawn using a callback override
- Here is the declaration of the bitmap (acWarningIcon2 was originally a png but exported and turned into a bitmap from AppWizard)
- Notice the undesired tiling effect of the warning icon

Any help is appreciated and thanks.

SEGGER - Florian · Mar 4th 2021, 11:02am

Hi Josh,

A few things are unclear to me. Do you have created the IMAGE widget with the AppWizard? If so, you cannot set a custom callback to that widget, only to widgets created manually with emWin.

If the bitmap is just a simple icon, you won't have to pass the IMAGE_CF_MEMDEV flag since a memory device won't be necessary for a small icon.

Also, I'm not sure why you are setting a custom callback to the IMAGE widget that has a WM_PAINT case. Note that when you are drawing in WM_PAINT of a window/widget, the coordinates are relative, meaning (0,0) would be the top-left coordinate of the widget and not the LCD.

My suggestion would be to remove the IMAGE callback and simply call IMAGE_SetBitmap() instead. Then, the widget will draw the bitmap by itself.

There is also no need to disable tiling mode manually, as it is disabled by default.

Best regards,
Florian

Josh123 · Mar 5th 2021, 4:04am

Hey Florian,

The widget is not created through AppWizard, but through emWin code.

I think the problem is with the way I am setting up the GUI_BITMAP structure:

const GUI_BITMAP WarningImageBitmap = {
18, // XSize
16, // YSize
40, // BytesPerLine
32, // BitsPerPixel
(unsigned char*)acWarningIcon2, // Pointer to picture data
&testPalette, // Pointer to palette
#if (GUI_USE_ARGB == 1)
GUI_DRAW_BMPM8888I
#else
GUI_DRAW_BMP8888
#endif
};

const unsigned char acWarningIcon2[1168UL + 1] = {
0x42, 0x4D, 0x1D, 0x00, 0x12, 0x00, 0x10, 0x00, 0x48, 0x00, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x25, 0x25, 0xFF, 0x30, 0x27, 0x27, 0xFF, 0xDF, 0x27, 0x27, 0xFF, 0xDF, 0x28, 0x28, 0xFF, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x27, 0x27, 0xFF, 0xC0,
0x27, 0x27, 0xFF, 0xFF, 0x27, 0x27, 0xFF, 0xFF, 0x27, 0x27, 0xFF, 0xBF, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

Can you explain to me how I derive bytes per line from the exported bitmap data from AppWizard? (partial bitmap data shown above)

SEGGER - Florian · Mar 5th 2021, 9:12am

Hi,

BytesPerLine are calculated as follows: ((BitsPerPixel / 8 * XSize). The bits per pixel depend on the bitmap format. GUI_DRAW_BMPM8888I is a 32bpp format, therefore for your bitmap the BytesPerLine would be ((32 / 8 * 18) = 72.

But the data in the char array is a streamed bitmap in binary format, instead of a normal bitmap.

You also don't have to set up bitmap structures manually. I would advise you to use the Bitmap Converter, you can download a free demo version on our website. You simply have to load your image into the Bitmap Converter, select a format and the image will be converted into a bitmap that emWin can use.

Best regards,
Florian

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