lv_draw_sw_grad.h
Functions
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void lv_draw_sw_grad_color_calculate(const lv_grad_dsc_t *dsc, int32_t range, int32_t frac, lv_color_t *color_out, lv_opa_t *opa_out)
Compute the color in the given gradient and fraction Gradient are specified in a virtual [0-255] range, so this function scales the virtual range to the given range
- Parameters:
dsc – The gradient descriptor to use
range – The range to use in computation.
frac – The current part used in the range. frac is in [0; range]
color_out – Calculated gradient color
opa_out – Calculated opacity
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lv_draw_sw_grad_calc_t *lv_draw_sw_grad_get(const lv_grad_dsc_t *gradient, int32_t w, int32_t h)
Get a gradient cache from the given parameters
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void lv_draw_sw_grad_cleanup(lv_draw_sw_grad_calc_t *grad)
Clean up the gradient item after it was get with
lv_grad_get_from_cache.- Parameters:
grad – pointer to a gradient
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void lv_draw_sw_grad_linear_setup(lv_grad_dsc_t *dsc, const lv_area_t *coords)
Calculate constants from the given parameters that are used during rendering
- Parameters:
dsc – gradient descriptor
coords – the area where to draw the gradient
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void lv_draw_sw_grad_linear_cleanup(lv_grad_dsc_t *dsc)
Free up the allocated memory for the gradient calculation
- Parameters:
dsc – gradient descriptor
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void lv_draw_sw_grad_linear_get_line(lv_grad_dsc_t *dsc, int32_t xp, int32_t yp, int32_t width, lv_draw_sw_grad_calc_t *result)
Calculate a line segment of a linear gradient
- Parameters:
dsc – gradient descriptor
xp – starting point x coordinate in gradient space
yp – starting point y coordinate in gradient space
width – width of the line segment in pixels
result – color buffer for the resulting line segment
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void lv_draw_sw_grad_radial_setup(lv_grad_dsc_t *dsc, const lv_area_t *coords)
Calculate constants from the given parameters that are used during rendering
- Parameters:
dsc – gradient descriptor
coords – the area where to draw the gradient
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void lv_draw_sw_grad_radial_cleanup(lv_grad_dsc_t *dsc)
Free up the allocated memory for the gradient calculation
- Parameters:
dsc – gradient descriptor
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void lv_draw_sw_grad_radial_get_line(lv_grad_dsc_t *dsc, int32_t xp, int32_t yp, int32_t width, lv_draw_sw_grad_calc_t *result)
Calculate a line segment of a radial gradient
- Parameters:
dsc – gradient descriptor
xp – starting point x coordinate in gradient space
yp – starting point y coordinate in gradient space
width – width of the line segment in pixels
result – color buffer for the resulting line segment
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void lv_draw_sw_grad_conical_setup(lv_grad_dsc_t *dsc, const lv_area_t *coords)
Calculate constants from the given parameters that are used during rendering
- Parameters:
dsc – gradient descriptor
coords – the area where to draw the gradient
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void lv_draw_sw_grad_conical_cleanup(lv_grad_dsc_t *dsc)
Free up the allocated memory for the gradient calculation
- Parameters:
dsc – gradient descriptor
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void lv_draw_sw_grad_conical_get_line(lv_grad_dsc_t *dsc, int32_t xp, int32_t yp, int32_t width, lv_draw_sw_grad_calc_t *result)
Calculate a line segment of a conical gradient
- Parameters:
dsc – gradient descriptor
xp – starting point x coordinate in gradient space
yp – starting point y coordinate in gradient space
width – width of the line segment in pixels
result – color buffer for the resulting line segment
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struct lv_draw_sw_grad_calc_t