def open_png(decoder, dsc):
img_dsc = lv.img_dsc_t.__cast__(dsc.src)
png_data = img_dsc.data
png_size = img_dsc.data_size
png_decoded = png.C_Pointer()
png_width = png.C_Pointer()
png_height = png.C_Pointer()
error = png.decode32(png_decoded, png_width, png_height, png_data,
png_size)
if error:
return None # LV_IMG_DECODER_OPEN_FAIL
img_size = png_width.int_val * png_height.int_val * lv.color_t.__SIZE__
img_data = png_decoded.ptr_val
# Convert png RGBA-big-endian format to lvgl ARGB-little-endian
# Eventually - this means swapping red and blue.
# More info on https://forum.lvgl.io/t/png-decoding-why-red-and-blue-are-swapped/72
img_view = img_data.__dereference__(img_size)
for i in range(0, img_size, lv.color_t.__SIZE__):
ch = lv.color_t.__cast__(img_view[i:i]).ch
ch.red, ch.blue = ch.blue, ch.red
dsc.img_data = img_data
return lv.RES.OK
def open_png(decoder, dsc):
img_dsc = lv.img_dsc_t.cast(dsc.src)
png_data = img_dsc.data
png_size = img_dsc.data_size
png_decoded = png.C_Pointer()
png_width = png.C_Pointer()
png_height = png.C_Pointer()
error = png.decode32(png_decoded, png_width, png_height, png_data,
png_size)
if error:
raise lodepng_error(error)
img_size = png_width.int_val * png_height.int_val * 4
img_data = png_decoded.ptr_val
img_view = img_data.__dereference__(img_size)
if COLOR_SIZE == 4:
convert_rgba8888_to_bgra8888(img_view)
elif COLOR_SIZE == 2:
if COLOR_IS_SWAPPED:
convert_rgba8888_to_swapped_bgra5658(img_view)
else:
convert_rgba8888_to_bgra5658(img_view)
else:
raise lodepng_error("Error: Color mode not supported yet!")
dsc.img_data = img_data
return lv.RES.OK
def open_png(decoder, dsc):
# Read and parse PNG file
img_dsc = lv.img_dsc_t.cast(dsc.src)
png_data = img_dsc.data
png_size = img_dsc.data_size
png_decoded = png.C_Pointer()
png_width = png.C_Pointer()
png_height = png.C_Pointer()
error = png.decode32(png_decoded, png_width, png_height, png_data,
png_size)
if error:
raise lodepng_error(error)
img_size = png_width.int_val * png_height.int_val * 4
img_data = png_decoded.ptr_val
img_view = img_data.__dereference__(img_size)
lv_h.rgba8888_to_5658(img_view)
dsc.img_data = img_data
return lv.RES.OK
def open_png(decoder, dsc):
img_dsc = lv.img_dsc_t.cast(dsc.src)
png_data = img_dsc.data
png_size = img_dsc.data_size
png_decoded = png.C_Pointer()
png_width = png.C_Pointer()
png_height = png.C_Pointer()
error = png.decode32(png_decoded, png_width, png_height, png_data,
png_size)
if error:
raise lodepng_error(error)
img_size = png_width.int_val * png_height.int_val * lv.color_t.SIZE
img_data = png_decoded.ptr_val
img_view = img_data.__dereference__(img_size)
convert_rgba_to_argb(img_view, img_size)
dsc.img_data = img_data
return lv.RES.OK