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lvgl_cpp/lvgl/draw/lv_img_buf.c

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/**
* @file lv_img_buf.c
*
*/
/*********************
* INCLUDES
*********************/
#include <stddef.h>
#include <string.h>
#include "lv_img_buf.h"
#include "lv_draw_img.h"
#include "../misc/lv_math.h"
#include "../misc/lv_log.h"
#include "../misc/lv_mem.h"
/*********************
* DEFINES
*********************/
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
/**********************
* STATIC VARIABLES
**********************/
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
/**
* Get the color of an image's pixel
* @param dsc an image descriptor
* @param x x coordinate of the point to get
* @param y x coordinate of the point to get
* @param color the color of the image. In case of `LV_IMG_CF_ALPHA_1/2/4/8` this color is used.
* Not used in other cases.
* @param safe true: check out of bounds
* @return color of the point
*/
lv_color_t lv_img_buf_get_px_color(lv_img_dsc_t * dsc, lv_coord_t x, lv_coord_t y, lv_color_t color)
{
lv_color_t p_color = lv_color_black();
uint8_t * buf_u8 = (uint8_t *)dsc->data;
if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR || dsc->header.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED ||
dsc->header.cf == LV_IMG_CF_TRUE_COLOR_ALPHA) {
uint8_t px_size = lv_img_cf_get_px_size(dsc->header.cf) >> 3;
uint32_t px = dsc->header.w * y * px_size + x * px_size;
lv_memcpy_small(&p_color, &buf_u8[px], sizeof(lv_color_t));
#if LV_COLOR_SIZE == 32
p_color.ch.alpha = 0xFF; /*Only the color should be get so use a default alpha value*/
#endif
}
else if(dsc->header.cf == LV_IMG_CF_INDEXED_1BIT) {
buf_u8 += 4 * 2;
uint8_t bit = x & 0x7;
x = x >> 3;
/*Get the current pixel.
*dsc->header.w + 7 means rounding up to 8 because the lines are byte aligned
*so the possible real width are 8, 16, 24 ...*/
uint32_t px = ((dsc->header.w + 7) >> 3) * y + x;
p_color.full = (buf_u8[px] & (1 << (7 - bit))) >> (7 - bit);
}
else if(dsc->header.cf == LV_IMG_CF_INDEXED_2BIT) {
buf_u8 += 4 * 4;
uint8_t bit = (x & 0x3) * 2;
x = x >> 2;
/*Get the current pixel.
*dsc->header.w + 3 means rounding up to 4 because the lines are byte aligned
*so the possible real width are 4, 8, 12 ...*/
uint32_t px = ((dsc->header.w + 3) >> 2) * y + x;
p_color.full = (buf_u8[px] & (3 << (6 - bit))) >> (6 - bit);
}
else if(dsc->header.cf == LV_IMG_CF_INDEXED_4BIT) {
buf_u8 += 4 * 16;
uint8_t bit = (x & 0x1) * 4;
x = x >> 1;
/*Get the current pixel.
*dsc->header.w + 1 means rounding up to 2 because the lines are byte aligned
*so the possible real width are 2, 4, 6 ...*/
uint32_t px = ((dsc->header.w + 1) >> 1) * y + x;
p_color.full = (buf_u8[px] & (0xF << (4 - bit))) >> (4 - bit);
}
else if(dsc->header.cf == LV_IMG_CF_INDEXED_8BIT) {
buf_u8 += 4 * 256;
uint32_t px = dsc->header.w * y + x;
p_color.full = buf_u8[px];
}
else if(dsc->header.cf == LV_IMG_CF_ALPHA_1BIT || dsc->header.cf == LV_IMG_CF_ALPHA_2BIT ||
dsc->header.cf == LV_IMG_CF_ALPHA_4BIT || dsc->header.cf == LV_IMG_CF_ALPHA_8BIT) {
p_color = color;
}
return p_color;
}
/**
* Get the alpha value of an image's pixel
* @param dsc pointer to an image descriptor
* @param x x coordinate of the point to set
* @param y x coordinate of the point to set
* @param safe true: check out of bounds
* @return alpha value of the point
*/
lv_opa_t lv_img_buf_get_px_alpha(lv_img_dsc_t * dsc, lv_coord_t x, lv_coord_t y)
{
uint8_t * buf_u8 = (uint8_t *)dsc->data;
if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR_ALPHA) {
uint32_t px = dsc->header.w * y * LV_IMG_PX_SIZE_ALPHA_BYTE + x * LV_IMG_PX_SIZE_ALPHA_BYTE;
return buf_u8[px + LV_IMG_PX_SIZE_ALPHA_BYTE - 1];
}
else if(dsc->header.cf == LV_IMG_CF_ALPHA_1BIT) {
uint8_t bit = x & 0x7;
x = x >> 3;
/*Get the current pixel.
*dsc->header.w + 7 means rounding up to 8 because the lines are byte aligned
*so the possible real width are 8 ,16, 24 ...*/
uint32_t px = ((dsc->header.w + 7) >> 3) * y + x;
uint8_t px_opa = (buf_u8[px] & (1 << (7 - bit))) >> (7 - bit);
return px_opa ? LV_OPA_TRANSP : LV_OPA_COVER;
}
else if(dsc->header.cf == LV_IMG_CF_ALPHA_2BIT) {
const uint8_t opa_table[4] = {0, 85, 170, 255}; /*Opacity mapping with bpp = 2*/
uint8_t bit = (x & 0x3) * 2;
x = x >> 2;
/*Get the current pixel.
*dsc->header.w + 4 means rounding up to 8 because the lines are byte aligned
*so the possible real width are 4 ,8, 12 ...*/
uint32_t px = ((dsc->header.w + 3) >> 2) * y + x;
uint8_t px_opa = (buf_u8[px] & (3 << (6 - bit))) >> (6 - bit);
return opa_table[px_opa];
}
else if(dsc->header.cf == LV_IMG_CF_ALPHA_4BIT) {
const uint8_t opa_table[16] = {0, 17, 34, 51, /*Opacity mapping with bpp = 4*/
68, 85, 102, 119, 136, 153, 170, 187, 204, 221, 238, 255
};
uint8_t bit = (x & 0x1) * 4;
x = x >> 1;
/*Get the current pixel.
*dsc->header.w + 1 means rounding up to 8 because the lines are byte aligned
*so the possible real width are 2 ,4, 6 ...*/
uint32_t px = ((dsc->header.w + 1) >> 1) * y + x;
uint8_t px_opa = (buf_u8[px] & (0xF << (4 - bit))) >> (4 - bit);
return opa_table[px_opa];
}
else if(dsc->header.cf == LV_IMG_CF_ALPHA_8BIT) {
uint32_t px = dsc->header.w * y + x;
return buf_u8[px];
}
return LV_OPA_COVER;
}
/**
* Set the alpha value of a pixel of an image. The color won't be affected
* @param dsc pointer to an image descriptor
* @param x x coordinate of the point to set
* @param y x coordinate of the point to set
* @param opa the desired opacity
* @param safe true: check out of bounds
*/
void lv_img_buf_set_px_alpha(lv_img_dsc_t * dsc, lv_coord_t x, lv_coord_t y, lv_opa_t opa)
{
uint8_t * buf_u8 = (uint8_t *)dsc->data;
if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR_ALPHA) {
uint8_t px_size = lv_img_cf_get_px_size(dsc->header.cf) >> 3;
uint32_t px = dsc->header.w * y * px_size + x * px_size;
buf_u8[px + px_size - 1] = opa;
}
else if(dsc->header.cf == LV_IMG_CF_ALPHA_1BIT) {
opa = opa >> 7; /*opa -> [0,1]*/
uint8_t bit = x & 0x7;
x = x >> 3;
/*Get the current pixel.
*dsc->header.w + 7 means rounding up to 8 because the lines are byte aligned
*so the possible real width are 8 ,16, 24 ...*/
uint32_t px = ((dsc->header.w + 7) >> 3) * y + x;
buf_u8[px] = buf_u8[px] & ~(1 << (7 - bit));
buf_u8[px] = buf_u8[px] | ((opa & 0x1) << (7 - bit));
}
else if(dsc->header.cf == LV_IMG_CF_ALPHA_2BIT) {
opa = opa >> 6; /*opa -> [0,3]*/
uint8_t bit = (x & 0x3) * 2;
x = x >> 2;
/*Get the current pixel.
*dsc->header.w + 4 means rounding up to 8 because the lines are byte aligned
*so the possible real width are 4 ,8, 12 ...*/
uint32_t px = ((dsc->header.w + 3) >> 2) * y + x;
buf_u8[px] = buf_u8[px] & ~(3 << (6 - bit));
buf_u8[px] = buf_u8[px] | ((opa & 0x3) << (6 - bit));
}
else if(dsc->header.cf == LV_IMG_CF_ALPHA_4BIT) {
opa = opa >> 4; /*opa -> [0,15]*/
uint8_t bit = (x & 0x1) * 4;
x = x >> 1;
/*Get the current pixel.
*dsc->header.w + 1 means rounding up to 8 because the lines are byte aligned
*so the possible real width are 2 ,4, 6 ...*/
uint32_t px = ((dsc->header.w + 1) >> 1) * y + x;
buf_u8[px] = buf_u8[px] & ~(0xF << (4 - bit));
buf_u8[px] = buf_u8[px] | ((opa & 0xF) << (4 - bit));
}
else if(dsc->header.cf == LV_IMG_CF_ALPHA_8BIT) {
uint32_t px = dsc->header.w * y + x;
buf_u8[px] = opa;
}
}
/**
* Set the color of a pixel of an image. The alpha channel won't be affected.
* @param dsc pointer to an image descriptor
* @param x x coordinate of the point to set
* @param y x coordinate of the point to set
* @param c color of the point
* @param safe true: check out of bounds
*/
void lv_img_buf_set_px_color(lv_img_dsc_t * dsc, lv_coord_t x, lv_coord_t y, lv_color_t c)
{
uint8_t * buf_u8 = (uint8_t *)dsc->data;
if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR || dsc->header.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED) {
uint8_t px_size = lv_img_cf_get_px_size(dsc->header.cf) >> 3;
uint32_t px = dsc->header.w * y * px_size + x * px_size;
lv_memcpy_small(&buf_u8[px], &c, px_size);
}
else if(dsc->header.cf == LV_IMG_CF_TRUE_COLOR_ALPHA) {
uint8_t px_size = lv_img_cf_get_px_size(dsc->header.cf) >> 3;
uint32_t px = dsc->header.w * y * px_size + x * px_size;
lv_memcpy_small(&buf_u8[px], &c, px_size - 1); /*-1 to not overwrite the alpha value*/
}
else if(dsc->header.cf == LV_IMG_CF_INDEXED_1BIT) {
buf_u8 += sizeof(lv_color32_t) * 2; /*Skip the palette*/
uint8_t bit = x & 0x7;
x = x >> 3;
/*Get the current pixel.
*dsc->header.w + 7 means rounding up to 8 because the lines are byte aligned
*so the possible real width are 8 ,16, 24 ...*/
uint32_t px = ((dsc->header.w + 7) >> 3) * y + x;
buf_u8[px] = buf_u8[px] & ~(1 << (7 - bit));
buf_u8[px] = buf_u8[px] | ((c.full & 0x1) << (7 - bit));
}
else if(dsc->header.cf == LV_IMG_CF_INDEXED_2BIT) {
buf_u8 += sizeof(lv_color32_t) * 4; /*Skip the palette*/
uint8_t bit = (x & 0x3) * 2;
x = x >> 2;
/*Get the current pixel.
*dsc->header.w + 3 means rounding up to 4 because the lines are byte aligned
*so the possible real width are 4, 8 ,12 ...*/
uint32_t px = ((dsc->header.w + 3) >> 2) * y + x;
buf_u8[px] = buf_u8[px] & ~(3 << (6 - bit));
buf_u8[px] = buf_u8[px] | ((c.full & 0x3) << (6 - bit));
}
else if(dsc->header.cf == LV_IMG_CF_INDEXED_4BIT) {
buf_u8 += sizeof(lv_color32_t) * 16; /*Skip the palette*/
uint8_t bit = (x & 0x1) * 4;
x = x >> 1;
/*Get the current pixel.
*dsc->header.w + 1 means rounding up to 2 because the lines are byte aligned
*so the possible real width are 2 ,4, 6 ...*/
uint32_t px = ((dsc->header.w + 1) >> 1) * y + x;
buf_u8[px] = buf_u8[px] & ~(0xF << (4 - bit));
buf_u8[px] = buf_u8[px] | ((c.full & 0xF) << (4 - bit));
}
else if(dsc->header.cf == LV_IMG_CF_INDEXED_8BIT) {
buf_u8 += sizeof(lv_color32_t) * 256; /*Skip the palette*/
uint32_t px = dsc->header.w * y + x;
buf_u8[px] = c.full;
}
}
/**
* Set the palette color of an indexed image. Valid only for `LV_IMG_CF_INDEXED1/2/4/8`
* @param dsc pointer to an image descriptor
* @param id the palette color to set:
* - for `LV_IMG_CF_INDEXED1`: 0..1
* - for `LV_IMG_CF_INDEXED2`: 0..3
* - for `LV_IMG_CF_INDEXED4`: 0..15
* - for `LV_IMG_CF_INDEXED8`: 0..255
* @param c the color to set
*/
void lv_img_buf_set_palette(lv_img_dsc_t * dsc, uint8_t id, lv_color_t c)
{
if((dsc->header.cf == LV_IMG_CF_ALPHA_1BIT && id > 1) || (dsc->header.cf == LV_IMG_CF_ALPHA_2BIT && id > 3) ||
(dsc->header.cf == LV_IMG_CF_ALPHA_4BIT && id > 15) || (dsc->header.cf == LV_IMG_CF_ALPHA_8BIT)) {
LV_LOG_WARN("lv_img_buf_set_px_alpha: invalid 'id'");
return;
}
lv_color32_t c32;
c32.full = lv_color_to32(c);
uint8_t * buf = (uint8_t *)dsc->data;
lv_memcpy_small(&buf[id * sizeof(c32)], &c32, sizeof(c32));
}
/**
* Allocate an image buffer in RAM
* @param w width of image
* @param h height of image
* @param cf a color format (`LV_IMG_CF_...`)
* @return an allocated image, or NULL on failure
*/
lv_img_dsc_t * lv_img_buf_alloc(lv_coord_t w, lv_coord_t h, lv_img_cf_t cf)
{
/*Allocate image descriptor*/
lv_img_dsc_t * dsc = lv_mem_alloc(sizeof(lv_img_dsc_t));
if(dsc == NULL)
return NULL;
lv_memset_00(dsc, sizeof(lv_img_dsc_t));
/*Get image data size*/
dsc->data_size = lv_img_buf_get_img_size(w, h, cf);
if(dsc->data_size == 0) {
lv_mem_free(dsc);
return NULL;
}
/*Allocate raw buffer*/
dsc->data = lv_mem_alloc(dsc->data_size);
if(dsc->data == NULL) {
lv_mem_free(dsc);
return NULL;
}
lv_memset_00((uint8_t *)dsc->data, dsc->data_size);
/*Fill in header*/
dsc->header.always_zero = 0;
dsc->header.w = w;
dsc->header.h = h;
dsc->header.cf = cf;
return dsc;
}
/**
* Free an allocated image buffer
* @param dsc image buffer to free
*/
void lv_img_buf_free(lv_img_dsc_t * dsc)
{
if(dsc != NULL) {
if(dsc->data != NULL)
lv_mem_free((void *)dsc->data);
lv_mem_free(dsc);
}
}
/**
* Get the memory consumption of a raw bitmap, given color format and dimensions.
* @param w width
* @param h height
* @param cf color format
* @return size in bytes
*/
uint32_t lv_img_buf_get_img_size(lv_coord_t w, lv_coord_t h, lv_img_cf_t cf)
{
switch(cf) {
case LV_IMG_CF_TRUE_COLOR:
return LV_IMG_BUF_SIZE_TRUE_COLOR(w, h);
case LV_IMG_CF_TRUE_COLOR_ALPHA:
return LV_IMG_BUF_SIZE_TRUE_COLOR_ALPHA(w, h);
case LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED:
return LV_IMG_BUF_SIZE_TRUE_COLOR_CHROMA_KEYED(w, h);
case LV_IMG_CF_ALPHA_1BIT:
return LV_IMG_BUF_SIZE_ALPHA_1BIT(w, h);
case LV_IMG_CF_ALPHA_2BIT:
return LV_IMG_BUF_SIZE_ALPHA_2BIT(w, h);
case LV_IMG_CF_ALPHA_4BIT:
return LV_IMG_BUF_SIZE_ALPHA_4BIT(w, h);
case LV_IMG_CF_ALPHA_8BIT:
return LV_IMG_BUF_SIZE_ALPHA_8BIT(w, h);
case LV_IMG_CF_INDEXED_1BIT:
return LV_IMG_BUF_SIZE_INDEXED_1BIT(w, h);
case LV_IMG_CF_INDEXED_2BIT:
return LV_IMG_BUF_SIZE_INDEXED_2BIT(w, h);
case LV_IMG_CF_INDEXED_4BIT:
return LV_IMG_BUF_SIZE_INDEXED_4BIT(w, h);
case LV_IMG_CF_INDEXED_8BIT:
return LV_IMG_BUF_SIZE_INDEXED_8BIT(w, h);
default:
return 0;
}
}
#if LV_DRAW_COMPLEX
/**
* Initialize a descriptor to transform an image
* @param dsc pointer to an `lv_img_transform_dsc_t` variable whose `cfg` field is initialized
*/
void _lv_img_buf_transform_init(lv_img_transform_dsc_t * dsc)
{
dsc->tmp.pivot_x_256 = dsc->cfg.pivot_x * 256;
dsc->tmp.pivot_y_256 = dsc->cfg.pivot_y * 256;
int32_t angle_low = dsc->cfg.angle / 10;
int32_t angle_high = angle_low + 1;
int32_t angle_rem = dsc->cfg.angle - (angle_low * 10);
int32_t s1 = lv_trigo_sin(-angle_low);
int32_t s2 = lv_trigo_sin(-angle_high);
int32_t c1 = lv_trigo_sin(-angle_low + 90);
int32_t c2 = lv_trigo_sin(-angle_high + 90);
dsc->tmp.sinma = (s1 * (10 - angle_rem) + s2 * angle_rem) / 10;
dsc->tmp.cosma = (c1 * (10 - angle_rem) + c2 * angle_rem) / 10;
/*Use smaller value to avoid overflow*/
dsc->tmp.sinma = dsc->tmp.sinma >> (LV_TRIGO_SHIFT - _LV_TRANSFORM_TRIGO_SHIFT);
dsc->tmp.cosma = dsc->tmp.cosma >> (LV_TRIGO_SHIFT - _LV_TRANSFORM_TRIGO_SHIFT);
dsc->tmp.chroma_keyed = lv_img_cf_is_chroma_keyed(dsc->cfg.cf) ? 1 : 0;
dsc->tmp.has_alpha = lv_img_cf_has_alpha(dsc->cfg.cf) ? 1 : 0;
if(dsc->cfg.cf == LV_IMG_CF_TRUE_COLOR || dsc->cfg.cf == LV_IMG_CF_TRUE_COLOR_ALPHA ||
dsc->cfg.cf == LV_IMG_CF_TRUE_COLOR_CHROMA_KEYED) {
dsc->tmp.native_color = 1;
}
else {
dsc->tmp.native_color = 0;
}
dsc->tmp.img_dsc.data = dsc->cfg.src;
dsc->tmp.img_dsc.header.always_zero = 0;
dsc->tmp.img_dsc.header.cf = dsc->cfg.cf;
dsc->tmp.img_dsc.header.w = dsc->cfg.src_w;
dsc->tmp.img_dsc.header.h = dsc->cfg.src_h;
/*The inverse of the zoom will be sued during the transformation
* + dsc->cfg.zoom / 2 for rounding*/
dsc->tmp.zoom_inv = (((256 * 256) << _LV_ZOOM_INV_UPSCALE) + dsc->cfg.zoom / 2) / dsc->cfg.zoom;
dsc->res.opa = LV_OPA_COVER;
dsc->res.color = dsc->cfg.color;
}
#endif
/**
* Get the area of a rectangle if its rotated and scaled
* @param res store the coordinates here
* @param w width of the rectangle to transform
* @param h height of the rectangle to transform
* @param angle angle of rotation
* @param zoom zoom, (256 no zoom)
* @param pivot x,y pivot coordinates of rotation
*/
void _lv_img_buf_get_transformed_area(lv_area_t * res, lv_coord_t w, lv_coord_t h, int16_t angle, uint16_t zoom,
const lv_point_t * pivot)
{
#if LV_DRAW_COMPLEX
if(angle == 0 && zoom == LV_IMG_ZOOM_NONE) {
res->x1 = 0;
res->y1 = 0;
res->x2 = w - 1;
res->y2 = h - 1;
return;
}
res->x1 = (((int32_t)(-pivot->x) * zoom) >> 8) - 1;
res->y1 = (((int32_t)(-pivot->y) * zoom) >> 8) - 1;
res->x2 = (((int32_t)(w - pivot->x) * zoom) >> 8) + 2;
res->y2 = (((int32_t)(h - pivot->y) * zoom) >> 8) + 2;
if(angle == 0) {
res->x1 += pivot->x;
res->y1 += pivot->y;
res->x2 += pivot->x;
res->y2 += pivot->y;
return;
}
int32_t angle_low = angle / 10;
int32_t angle_high = angle_low + 1;
int32_t angle_rem = angle - (angle_low * 10);
int32_t s1 = lv_trigo_sin(angle_low);
int32_t s2 = lv_trigo_sin(angle_high);
int32_t c1 = lv_trigo_sin(angle_low + 90);
int32_t c2 = lv_trigo_sin(angle_high + 90);
int32_t sinma = (s1 * (10 - angle_rem) + s2 * angle_rem) / 10;
int32_t cosma = (c1 * (10 - angle_rem) + c2 * angle_rem) / 10;
/*Use smaller value to avoid overflow*/
sinma = sinma >> (LV_TRIGO_SHIFT - _LV_TRANSFORM_TRIGO_SHIFT);
cosma = cosma >> (LV_TRIGO_SHIFT - _LV_TRANSFORM_TRIGO_SHIFT);
lv_point_t lt;
lv_point_t rt;
lv_point_t lb;
lv_point_t rb;
lv_coord_t xt;
lv_coord_t yt;
xt = res->x1;
yt = res->y1;
lt.x = ((cosma * xt - sinma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->x;
lt.y = ((sinma * xt + cosma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->y;
xt = res->x2;
yt = res->y1;
rt.x = ((cosma * xt - sinma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->x;
rt.y = ((sinma * xt + cosma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->y;
xt = res->x1;
yt = res->y2;
lb.x = ((cosma * xt - sinma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->x;
lb.y = ((sinma * xt + cosma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->y;
xt = res->x2;
yt = res->y2;
rb.x = ((cosma * xt - sinma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->x;
rb.y = ((sinma * xt + cosma * yt) >> _LV_TRANSFORM_TRIGO_SHIFT) + pivot->y;
res->x1 = LV_MIN4(lb.x, lt.x, rb.x, rt.x);
res->x2 = LV_MAX4(lb.x, lt.x, rb.x, rt.x);
res->y1 = LV_MIN4(lb.y, lt.y, rb.y, rt.y);
res->y2 = LV_MAX4(lb.y, lt.y, rb.y, rt.y);
#else
LV_UNUSED(angle);
LV_UNUSED(zoom);
LV_UNUSED(pivot);
res->x1 = 0;
res->y1 = 0;
res->x2 = w - 1;
res->y2 = h - 1;
#endif
}
#if LV_DRAW_COMPLEX
/**
* Get which color and opa would come to a pixel if it were rotated
* @param dsc a descriptor initialized by `lv_img_buf_rotate_init`
* @param x the coordinate which color and opa should be get
* @param y the coordinate which color and opa should be get
* @return true: there is valid pixel on these x/y coordinates; false: the rotated pixel was out of the image
* @note the result is written back to `dsc->res_color` and `dsc->res_opa`
*/
bool _lv_img_buf_transform(lv_img_transform_dsc_t * dsc, lv_coord_t x, lv_coord_t y)
{
const uint8_t * src_u8 = (const uint8_t *)dsc->cfg.src;
/*Get the target point relative coordinates to the pivot*/
int32_t xt = x - dsc->cfg.pivot_x;
int32_t yt = y - dsc->cfg.pivot_y;
int32_t xs;
int32_t ys;
if(dsc->cfg.zoom == LV_IMG_ZOOM_NONE) {
/*Get the source pixel from the upscaled image*/
xs = ((dsc->tmp.cosma * xt - dsc->tmp.sinma * yt) >> (_LV_TRANSFORM_TRIGO_SHIFT - 8)) + dsc->tmp.pivot_x_256;
ys = ((dsc->tmp.sinma * xt + dsc->tmp.cosma * yt) >> (_LV_TRANSFORM_TRIGO_SHIFT - 8)) + dsc->tmp.pivot_y_256;
}
else if(dsc->cfg.angle == 0) {
xt = (int32_t)((int32_t)xt * dsc->tmp.zoom_inv) >> _LV_ZOOM_INV_UPSCALE;
yt = (int32_t)((int32_t)yt * dsc->tmp.zoom_inv) >> _LV_ZOOM_INV_UPSCALE;
xs = xt + dsc->tmp.pivot_x_256;
ys = yt + dsc->tmp.pivot_y_256;
}
else {
xt = (int32_t)((int32_t)xt * dsc->tmp.zoom_inv) >> _LV_ZOOM_INV_UPSCALE;
yt = (int32_t)((int32_t)yt * dsc->tmp.zoom_inv) >> _LV_ZOOM_INV_UPSCALE;
xs = ((dsc->tmp.cosma * xt - dsc->tmp.sinma * yt) >> (_LV_TRANSFORM_TRIGO_SHIFT)) + dsc->tmp.pivot_x_256;
ys = ((dsc->tmp.sinma * xt + dsc->tmp.cosma * yt) >> (_LV_TRANSFORM_TRIGO_SHIFT)) + dsc->tmp.pivot_y_256;
}
/*Get the integer part of the source pixel*/
int32_t xs_int = xs >> 8;
int32_t ys_int = ys >> 8;
if(xs_int >= dsc->cfg.src_w) return false;
else if(xs_int < 0) return false;
if(ys_int >= dsc->cfg.src_h) return false;
else if(ys_int < 0) return false;
uint8_t px_size;
uint32_t pxi;
if(dsc->tmp.native_color) {
if(dsc->tmp.has_alpha == 0) {
px_size = LV_COLOR_SIZE >> 3;
pxi = dsc->cfg.src_w * ys_int * px_size + xs_int * px_size;
lv_memcpy_small(&dsc->res.color, &src_u8[pxi], px_size);
}
else {
px_size = LV_IMG_PX_SIZE_ALPHA_BYTE;
pxi = dsc->cfg.src_w * ys_int * px_size + xs_int * px_size;
lv_memcpy_small(&dsc->res.color, &src_u8[pxi], px_size - 1);
dsc->res.opa = src_u8[pxi + px_size - 1];
}
}
else {
pxi = 0; /*unused*/
px_size = 0; /*unused*/
dsc->res.color = lv_img_buf_get_px_color(&dsc->tmp.img_dsc, xs_int, ys_int, dsc->cfg.color);
dsc->res.opa = lv_img_buf_get_px_alpha(&dsc->tmp.img_dsc, xs_int, ys_int);
}
if(dsc->tmp.chroma_keyed) {
lv_color_t ct = LV_COLOR_CHROMA_KEY;
if(dsc->res.color.full == ct.full) return false;
}
if(dsc->cfg.antialias == false) return true;
dsc->tmp.xs = xs;
dsc->tmp.ys = ys;
dsc->tmp.xs_int = xs_int;
dsc->tmp.ys_int = ys_int;
dsc->tmp.pxi = pxi;
dsc->tmp.px_size = px_size;
bool ret;
ret = _lv_img_buf_transform_anti_alias(dsc);
return ret;
}
/**
* Continue transformation by taking the neighbors into account
* @param dsc pointer to the transformation descriptor
*/
bool _lv_img_buf_transform_anti_alias(lv_img_transform_dsc_t * dsc)
{
const uint8_t * src_u8 = dsc->cfg.src;
/*Get the fractional part of the source pixel*/
int xs_fract = dsc->tmp.xs & 0xff;
int ys_fract = dsc->tmp.ys & 0xff;
int32_t xn; /*x neighbor*/
lv_opa_t xr; /*x mix ratio*/
if(xs_fract < 0x70) {
xn = - 1;
if(dsc->tmp.xs_int + xn < 0) xn = 0;
xr = xs_fract + 0x80;
}
else if(xs_fract > 0x90) {
xn = 1;
if(dsc->tmp.xs_int + xn >= dsc->cfg.src_w) xn = 0;
xr = (0xFF - xs_fract) + 0x80;
}
else {
xn = 0;
xr = 0xFF;
}
int32_t yn; /*x neighbor*/
lv_opa_t yr; /*x mix ratio*/
if(ys_fract < 0x70) {
yn = - 1;
if(dsc->tmp.ys_int + yn < 0) yn = 0;
yr = ys_fract + 0x80;
}
else if(ys_fract > 0x90) {
yn = 1;
if(dsc->tmp.ys_int + yn >= dsc->cfg.src_h) yn = 0;
yr = (0xFF - ys_fract) + 0x80;
}
else {
yn = 0;
yr = 0xFF;
}
lv_color_t c00 = dsc->res.color;
lv_color_t c01;
lv_color_t c10;
lv_color_t c11;
lv_opa_t a00 = dsc->res.opa;
lv_opa_t a10 = 0;
lv_opa_t a01 = 0;
lv_opa_t a11 = 0;
if(dsc->tmp.native_color) {
lv_memcpy_small(&c01, &src_u8[dsc->tmp.pxi + dsc->tmp.px_size * xn], sizeof(lv_color_t));
lv_memcpy_small(&c10, &src_u8[dsc->tmp.pxi + dsc->cfg.src_w * dsc->tmp.px_size * yn], sizeof(lv_color_t));
lv_memcpy_small(&c11, &src_u8[dsc->tmp.pxi + dsc->cfg.src_w * dsc->tmp.px_size * yn + dsc->tmp.px_size * xn],
sizeof(lv_color_t));
if(dsc->tmp.has_alpha) {
a10 = src_u8[dsc->tmp.pxi + dsc->tmp.px_size * xn + dsc->tmp.px_size - 1];
a01 = src_u8[dsc->tmp.pxi + dsc->cfg.src_w * dsc->tmp.px_size * yn + dsc->tmp.px_size - 1];
a11 = src_u8[dsc->tmp.pxi + dsc->cfg.src_w * dsc->tmp.px_size * yn + dsc->tmp.px_size * xn + dsc->tmp.px_size - 1];
}
}
else {
c01 = lv_img_buf_get_px_color(&dsc->tmp.img_dsc, dsc->tmp.xs_int + xn, dsc->tmp.ys_int, dsc->cfg.color);
c10 = lv_img_buf_get_px_color(&dsc->tmp.img_dsc, dsc->tmp.xs_int, dsc->tmp.ys_int + yn, dsc->cfg.color);
c11 = lv_img_buf_get_px_color(&dsc->tmp.img_dsc, dsc->tmp.xs_int + xn, dsc->tmp.ys_int + yn, dsc->cfg.color);
if(dsc->tmp.has_alpha) {
a10 = lv_img_buf_get_px_alpha(&dsc->tmp.img_dsc, dsc->tmp.xs_int + xn, dsc->tmp.ys_int);
a01 = lv_img_buf_get_px_alpha(&dsc->tmp.img_dsc, dsc->tmp.xs_int, dsc->tmp.ys_int + yn);
a11 = lv_img_buf_get_px_alpha(&dsc->tmp.img_dsc, dsc->tmp.xs_int + xn, dsc->tmp.ys_int + yn);
}
}
lv_opa_t xr0 = xr;
lv_opa_t xr1 = xr;
if(dsc->tmp.has_alpha) {
lv_opa_t a0 = (a00 * xr + (a10 * (255 - xr))) >> 8;
lv_opa_t a1 = (a01 * xr + (a11 * (255 - xr))) >> 8;
dsc->res.opa = (a0 * yr + (a1 * (255 - yr))) >> 8;
if(a0 <= LV_OPA_MIN && a1 <= LV_OPA_MIN) return false;
if(a0 <= LV_OPA_MIN) yr = LV_OPA_TRANSP;
if(a1 <= LV_OPA_MIN) yr = LV_OPA_COVER;
if(a00 <= LV_OPA_MIN) xr0 = LV_OPA_TRANSP;
if(a10 <= LV_OPA_MIN) xr0 = LV_OPA_COVER;
if(a01 <= LV_OPA_MIN) xr1 = LV_OPA_TRANSP;
if(a11 <= LV_OPA_MIN) xr1 = LV_OPA_COVER;
}
else {
xr0 = xr;
xr1 = xr;
dsc->res.opa = LV_OPA_COVER;
}
lv_color_t c0;
if(xr0 == LV_OPA_TRANSP) c0 = c01;
else if(xr0 == LV_OPA_COVER) c0 = c00;
else c0 = lv_color_mix(c00, c01, xr0);
lv_color_t c1;
if(xr1 == LV_OPA_TRANSP) c1 = c11;
else if(xr1 == LV_OPA_COVER) c1 = c10;
else c1 = lv_color_mix(c10, c11, xr1);
if(yr == LV_OPA_TRANSP) dsc->res.color = c1;
else if(yr == LV_OPA_COVER) dsc->res.color = c0;
else dsc->res.color = lv_color_mix(c0, c1, yr);
return true;
}
#endif
/**********************
* STATIC FUNCTIONS
**********************/
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