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lvgl/lv_draw/lv_draw.c
Gabor Kiss-Vamosi ceae0c539e lv_draw_img: further fix on buffer oveflow
2018-06-07 15:38:48 +02:00

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/**
* @file lv_draw.c
*
*/
/*********************
* INCLUDES
*********************/
#include "../../lv_conf.h"
#include <stdio.h>
#include <stdbool.h>
#include "lv_draw.h"
#include "lv_draw_rbasic.h"
#include "lv_draw_vbasic.h"
#include "../lv_misc/lv_fs.h"
#include "../lv_misc/lv_math.h"
#include "../lv_misc/lv_ufs.h"
#include "../lv_objx/lv_img.h"
/*********************
* DEFINES
*********************/
#define LABEL_RECOLOR_PAR_LENGTH 6
/**********************
* TYPEDEFS
**********************/
typedef enum
{
CMD_STATE_WAIT,
CMD_STATE_PAR,
CMD_STATE_IN,
}cmd_state_t;
/**********************
* STATIC PROTOTYPES
**********************/
static uint8_t hex_char_to_num(char hex);
#if USE_LV_TRIANGLE != 0
static void point_swap(lv_point_t * p1, lv_point_t * p2);
#endif
/**********************
* STATIC VARIABLES
**********************/
#if LV_VDB_SIZE != 0
void (*px_fp)(lv_coord_t x, lv_coord_t y, const lv_area_t * mask, lv_color_t color, lv_opa_t opa) = lv_vpx;
void (*fill_fp)(const lv_area_t * coords, const lv_area_t * mask, lv_color_t color, lv_opa_t opa) = lv_vfill;
void (*letter_fp)(const lv_point_t * pos_p, const lv_area_t * mask, const lv_font_t * font_p, uint32_t letter, lv_color_t color, lv_opa_t opa) = lv_vletter;
# if USE_LV_IMG
void (*map_fp)(const lv_area_t * cords_p, const lv_area_t * mask_p,
const uint8_t * map_p, lv_opa_t opa, bool chroma_key, bool alpha_byte,
lv_color_t recolor, lv_opa_t recolor_opa) = lv_vmap;
# endif /*USE_LV_IMG*/
#elif USE_LV_REAL_DRAW != 0
/* px_fp used only by shadow drawing and anti aliasing
* static void (*px_fp)(lv_coord_t x, lv_coord_t y, const lv_area_t * mask, lv_color_t color, lv_opa_t opa) = lv_rpx;
*/
static void (*fill_fp)(const lv_area_t * coords, const lv_area_t * mask, lv_color_t color, lv_opa_t opa) = lv_rfill;
static void (*letter_fp)(const lv_point_t * pos_p, const lv_area_t * mask, const lv_font_t * font_p, uint32_t letter, lv_color_t color, lv_opa_t opa) = lv_rletter;
# if USE_LV_IMG
static void (*map_fp)(const lv_area_t * cords_p, const lv_area_t * mask_p,
const uint8_t * map_p, lv_opa_t opa, bool chroma_key, bool alpha_byte,
lv_color_t recolor, lv_opa_t recolor_opa) = lv_rmap;
# endif /*USE_LV_IMG*/
#else
/*Invalid settings. Compiler error will be thrown*/
static void (*px_fp)(lv_coord_t x, lv_coord_t y, const lv_area_t * mask, lv_color_t color, lv_opa_t opa) = NULL;
static void (*fill_fp)(const lv_area_t * coords, const lv_area_t * mask, lv_color_t color, lv_opa_t opa) = NULL;
static void (*letter_fp)(const lv_point_t * pos_p, const lv_area_t * mask, const lv_font_t * font_p, uint32_t letter, lv_color_t color, lv_opa_t opa) = NULL;
static void (*map_fp)(const lv_area_t * cords_p, const lv_area_t * mask_p,
const uint8_t * map_p, lv_opa_t opa, bool chroma_key, bool alpha_byte,
lv_color_t recolor, lv_opa_t recolor_opa) = NULL;
#endif
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
#if USE_LV_TRIANGLE != 0
/**
*
* @param points pointer to an array with 3 points
* @param mask the triangle will be drawn only in this mask
* @param color color of the triangle
*/
void lv_draw_triangle(const lv_point_t * points, const lv_area_t * mask, lv_color_t color)
{
lv_point_t tri[3];
memcpy(tri, points, sizeof(tri));
/*Sort the vertices according to their y coordinate (0: y max, 1: y mid, 2:y min)*/
if(tri[1].y < tri[0].y) point_swap(&tri[1], &tri[0]);
if(tri[2].y < tri[1].y) point_swap(&tri[2], &tri[1]);
if(tri[1].y < tri[0].y) point_swap(&tri[1], &tri[0]);
/*Return is the triangle is degenerated*/
if(tri[0].x == tri[1].x && tri[0].y == tri[1].y) return;
if(tri[1].x == tri[2].x && tri[1].y == tri[2].y) return;
if(tri[0].x == tri[2].x && tri[0].y == tri[2].y) return;
if(tri[0].x == tri[1].x && tri[1].x == tri[2].x) return;
if(tri[0].y == tri[1].y && tri[1].y == tri[2].y) return;
/*Draw the triangle*/
lv_point_t edge1;
lv_coord_t dx1 = LV_MATH_ABS(tri[0].x - tri[1].x);
lv_coord_t sx1 = tri[0].x < tri[1].x ? 1 : -1;
lv_coord_t dy1 = LV_MATH_ABS(tri[0].y - tri[1].y);
lv_coord_t sy1 = tri[0].y < tri[1].y ? 1 : -1;
lv_coord_t err1 = (dx1 > dy1 ? dx1 : -dy1) / 2;
lv_coord_t err_tmp1;
lv_point_t edge2;
lv_coord_t dx2 = LV_MATH_ABS(tri[0].x - tri[2].x);
lv_coord_t sx2 = tri[0].x < tri[2].x ? 1 : -1;
lv_coord_t dy2 = LV_MATH_ABS(tri[0].y - tri[2].y);
lv_coord_t sy2 = tri[0].y < tri[2].y ? 1 : -1;
lv_coord_t err2 = (dx1 > dy2 ? dx2 : -dy2) / 2;
lv_coord_t err_tmp2;
lv_coord_t y1_tmp;
lv_coord_t y2_tmp;
edge1.x = tri[0].x;
edge1.y = tri[0].y;
edge2.x = tri[0].x;
edge2.y = tri[0].y;
lv_area_t act_area;
lv_area_t draw_area;
while(1) {
act_area.x1 = edge1.x;
act_area.x2 = edge2.x ;
act_area.y1 = edge1.y;
act_area.y2 = edge2.y ;
draw_area.x1 = LV_MATH_MIN(act_area.x1, act_area.x2);
draw_area.x2 = LV_MATH_MAX(act_area.x1, act_area.x2);
draw_area.y1 = LV_MATH_MIN(act_area.y1, act_area.y2);
draw_area.y2 = LV_MATH_MAX(act_area.y1, act_area.y2);
draw_area.x2--; /*Do not draw most right pixel because it will be drawn by the adjacent triangle*/
fill_fp(&draw_area, mask, color, LV_OPA_50);
/*Calc. the next point of edge1*/
y1_tmp = edge1.y;
do {
if (edge1.x == tri[1].x && edge1.y == tri[1].y) {
dx1 = LV_MATH_ABS(tri[1].x - tri[2].x);
sx1 = tri[1].x < tri[2].x ? 1 : -1;
dy1 = LV_MATH_ABS(tri[1].y - tri[2].y);
sy1 = tri[1].y < tri[2].y ? 1 : -1;
err1 = (dx1 > dy1 ? dx1 : -dy1) / 2;
}
else if (edge1.x == tri[2].x && edge1.y == tri[2].y) return;
err_tmp1 = err1;
if (err_tmp1 >-dx1) {
err1 -= dy1;
edge1.x += sx1;
}
if (err_tmp1 < dy1) {
err1 += dx1;
edge1.y += sy1;
}
} while(edge1.y == y1_tmp);
/*Calc. the next point of edge2*/
y2_tmp = edge2.y;
do {
if (edge2.x == tri[2].x && edge2.y == tri[2].y) return;
err_tmp2 = err2;
if (err_tmp2 > -dx2) {
err2 -= dy2;
edge2.x += sx2;
}
if (err_tmp2 < dy2) {
err2 += dx2;
edge2.y += sy2;
}
} while(edge2.y == y2_tmp);
}
}
#endif
/**
* Write a text
* @param coords coordinates of the label
* @param mask the label will be drawn only in this area
* @param style pointer to a style
* @param txt 0 terminated text to write
* @param flag settings for the text from 'txt_flag_t' enum
* @param offset text offset in x and y direction (NULL if unused)
*
*/
void lv_draw_label(const lv_area_t * coords,const lv_area_t * mask, const lv_style_t * style,
const char * txt, lv_txt_flag_t flag, lv_point_t * offset)
{
const lv_font_t * font = style->text.font;
lv_coord_t w;
if((flag & LV_TXT_FLAG_EXPAND) == 0) {
w = lv_area_get_width(coords);
} else {
lv_point_t p;
lv_txt_get_size(&p, txt, style->text.font, style->text.letter_space, style->text.line_space, LV_COORD_MAX, flag);
w = p.x;
}
/*Init variables for the first line*/
lv_coord_t line_length = 0;
uint32_t line_start = 0;
uint32_t line_end = lv_txt_get_next_line(txt, font, style->text.letter_space, w, flag);
lv_point_t pos;
pos.x = coords->x1;
pos.y = coords->y1;
/*Align the line to middle if enabled*/
if(flag & LV_TXT_FLAG_CENTER) {
line_length = lv_txt_get_width(&txt[line_start], line_end - line_start,
font, style->text.letter_space, flag);
pos.x += (w - line_length) / 2;
}
cmd_state_t cmd_state = CMD_STATE_WAIT;
uint32_t i;
uint16_t par_start = 0;
lv_color_t recolor;
lv_coord_t letter_w;
lv_coord_t x_ofs = 0;
lv_coord_t y_ofs = 0;
if(offset != NULL) {
x_ofs = offset->x;
y_ofs = offset->y;
pos.y += y_ofs;
}
/*Real draw need a background color for higher bpp letter*/
#if LV_VDB_SIZE == 0
lv_rletter_set_background(style->body.main_color);
#endif
/*Write out all lines*/
while(txt[line_start] != '\0') {
if(offset != NULL) {
pos.x += x_ofs;
}
/*Write all letter of a line*/
cmd_state = CMD_STATE_WAIT;
i = line_start;
uint32_t letter;
while(i < line_end) {
letter = lv_txt_utf8_next(txt, &i);
/*Handle the re-color command*/
if((flag & LV_TXT_FLAG_RECOLOR) != 0) {
if(letter == (uint32_t)LV_TXT_COLOR_CMD[0]) {
if(cmd_state == CMD_STATE_WAIT) { /*Start char*/
par_start = i;// + lv_txt_utf8_size(txt[i]);
cmd_state = CMD_STATE_PAR;
continue;
} else if(cmd_state == CMD_STATE_PAR) { /*Other start char in parameter escaped cmd. char */
cmd_state = CMD_STATE_WAIT;
}else if(cmd_state == CMD_STATE_IN) { /*Command end */
cmd_state = CMD_STATE_WAIT;
continue;
}
}
/*Skip the color parameter and wait the space after it*/
if(cmd_state == CMD_STATE_PAR) {
if(letter == ' ') {
/*Get the parameter*/
if(i - par_start == LABEL_RECOLOR_PAR_LENGTH + 1) {
char buf[LABEL_RECOLOR_PAR_LENGTH + 1];
memcpy(buf, &txt[par_start], LABEL_RECOLOR_PAR_LENGTH);
buf[LABEL_RECOLOR_PAR_LENGTH] = '\0';
int r,g,b;
r = (hex_char_to_num(buf[0]) << 4) + hex_char_to_num(buf[1]);
g = (hex_char_to_num(buf[2]) << 4) + hex_char_to_num(buf[3]);
b = (hex_char_to_num(buf[4]) << 4) + hex_char_to_num(buf[5]);
recolor = LV_COLOR_MAKE(r, g, b);
} else {
recolor.full = style->text.color.full;
}
cmd_state = CMD_STATE_IN; /*After the parameter the text is in the command*/
}
continue;
}
}
lv_color_t color = style->text.color;
if(cmd_state == CMD_STATE_IN) color = recolor;
letter_fp(&pos, mask, font, letter, color, style->text.opa);
letter_w = lv_font_get_width(font, letter);
pos.x += letter_w + style->text.letter_space;
}
/*Go to next line*/
line_start = line_end;
line_end += lv_txt_get_next_line(&txt[line_start], font, style->text.letter_space, w, flag);
pos.x = coords->x1;
/*Align to middle*/
if(flag & LV_TXT_FLAG_CENTER) {
line_length = lv_txt_get_width(&txt[line_start], line_end - line_start,
font, style->text.letter_space, flag);
pos.x += (w - line_length) / 2;
}
/*Go the next line position*/
pos.y += lv_font_get_height(font);
pos.y += style->text.line_space;
}
}
#if USE_LV_IMG
/**
* Draw an image
* @param coords the coordinates of the image
* @param mask the image will be drawn only in this area
* @param map_p pointer to a lv_color_t array which contains the pixels of the image
* @param opa opacity of the image (0..255)
*/
void lv_draw_img(const lv_area_t * coords, const lv_area_t * mask,
const lv_style_t * style, const void * src)
{
if(src == NULL) {
lv_draw_rect(coords, mask, &lv_style_plain);
lv_draw_label(coords, mask, &lv_style_plain, "No\ndata", LV_TXT_FLAG_NONE, NULL);
return;
}
const uint8_t * u8_p = (uint8_t*) src;
if(u8_p[0] >= 'A' && u8_p[0] <= 'Z') { /*It will be a path of a file*/
#if USE_LV_FILESYSTEM
lv_fs_file_t file;
lv_fs_res_t res = lv_fs_open(&file, src, LV_FS_MODE_RD);
if(res == LV_FS_RES_OK) {
lv_img_t img_data;
uint32_t br;
res = lv_fs_read(&file, &img_data, sizeof(lv_img_t), &br);
lv_area_t mask_com; /*Common area of mask and cords*/
bool union_ok;
union_ok = lv_area_union(&mask_com, mask, coords);
if(union_ok == false) {
lv_fs_close(&file);
return;
}
uint8_t px_size = 0;
switch(img_data.header.format) {
case LV_IMG_FORMAT_FILE_RAW_RGB332: px_size = 1; break;
case LV_IMG_FORMAT_FILE_RAW_RGB565: px_size = 2; break;
case LV_IMG_FORMAT_FILE_RAW_RGB888: px_size = 4; break;
default: return;
}
if(img_data.header.alpha_byte) { /*Correction with the alpha byte*/
px_size++;
if(img_data.header.format == LV_IMG_FORMAT_FILE_RAW_RGB888) px_size--; /*Stored in the 4 byte anyway*/
}
/* Move the file pointer to the start address according to mask*/
uint32_t start_offset = sizeof(img_data.header);
start_offset += (lv_area_get_width(coords)) * (mask_com.y1 - coords->y1) * px_size; /*First row*/
start_offset += (mask_com.x1 - coords->x1) * px_size; /*First col*/
lv_fs_seek(&file, start_offset);
uint32_t useful_data = lv_area_get_width(&mask_com) * px_size;
uint32_t next_row = lv_area_get_width(coords) * px_size - useful_data;
lv_area_t line;
lv_area_copy(&line, &mask_com);
lv_area_set_height(&line, 1);
lv_coord_t row;
uint32_t act_pos;
#if LV_COMPILER_VLA_SUPPORTED
uint8_t buf[lv_area_get_width(&mask_com) * px_size];
#else
# if LV_HOR_RES > LV_VER_RES
uint8_t buf[LV_HOR_RES * px_size];
# else
uint8_t buf[LV_VER_RES * px_size];
# endif
#endif
for(row = mask_com.y1; row <= mask_com.y2; row ++) {
res = lv_fs_read(&file, buf, useful_data, &br);
map_fp(&line, &mask_com, (uint8_t *)buf, style->image.opa, img_data.header.chroma_keyed, img_data.header.alpha_byte,
style->image.color, style->image.intense);
lv_fs_tell(&file, &act_pos);
lv_fs_seek(&file, act_pos + next_row);
line.y1++; /*Go down a line*/
line.y2++;
}
lv_fs_close(&file);
if(res != LV_FS_RES_OK) {
lv_draw_rect(coords, mask, &lv_style_plain);
lv_draw_label(coords, mask, &lv_style_plain, "No data", LV_TXT_FLAG_NONE, NULL);
}
}
#endif
}
else {
const lv_img_t * img_var = src;
lv_area_t mask_com; /*Common area of mask and coords*/
bool union_ok;
union_ok = lv_area_union(&mask_com, mask, coords);
if(union_ok == false) {
return; /*Out of mask*/
}
map_fp(coords, mask, img_var->pixel_map, style->image.opa, img_var->header.chroma_keyed, img_var->header.alpha_byte, style->image.color, style->image.intense);
}
}
#endif
/**********************
* STATIC FUNCTIONS
**********************/
#if LV_ANTIALIAS != 0
lv_opa_t antialias_get_opa(lv_coord_t seg, lv_coord_t px_id, lv_opa_t line_opa)
{
/* How to calculate the opacity of pixels on the edges which makes the anti-aliasing?
* For example we have a line like this (y = -0.5 * x):
*
* | _ _
* * * |
*
* Anti-aliased pixels come to the '*' characters
* Calculate what percentage of the pixels should be covered if real line (not rasterized) would be drawn:
* 1. A real line should start on (0;0) and end on (2;1)
* 2. So the line intersection coordinates on the first pixel: (0;0) (1;0.5) -> 25% covered pixel in average
* 3. For the second pixel: (1;0.5) (2;1) -> 75% covered pixel in average
* 4. The equation: (px_id * 2 + 1) / (segment_width * 2)
* segment_width: the line segment which is being anti-aliased (was 2 in the example)
* px_id: pixel ID from 0 to (segment_width - 1)
* result: [0..1] coverage of the pixel
*/
/*Accelerate the common segment sizes to avoid division*/
static const lv_opa_t seg1[1] = {128};
static const lv_opa_t seg2[2] = {64, 192};
static const lv_opa_t seg3[3] = {42, 128, 212};
static const lv_opa_t seg4[4] = {32, 96, 159, 223};
static const lv_opa_t seg5[5] = {26, 76, 128, 178, 230};
static const lv_opa_t seg6[6] = {21, 64, 106, 148, 191, 234};
static const lv_opa_t seg7[7] = {18, 55, 91, 128, 164, 200, 237};
static const lv_opa_t seg8[8] = {16, 48, 80, 112, 143, 175, 207, 239};
static const lv_opa_t * seg_map[] = {seg1, seg2, seg3, seg4,
seg5, seg6, seg7, seg8};
if(seg == 0) return LV_OPA_TRANSP;
else if(seg < 8) return (uint32_t)((uint32_t)seg_map[seg - 1][px_id] * line_opa) >> 8;
else {
return ((px_id * 2 + 1) * line_opa) / (2 * seg);
}
}
#endif
/**
* Convert a hexadecimal characters to a number (0..15)
* @param hex Pointer to a hexadecimal character (0..9, A..F)
* @return the numerical value of `hex` or 0 on error
*/
static uint8_t hex_char_to_num(char hex)
{
if(hex >= '0' && hex <= '9') {
return hex - '0';
}
if(hex >= 'a') hex -= 'a' - 'A'; /*Convert to upper case*/
switch(hex) {
case 'A': return 10;
case 'B': return 11;
case 'C': return 12;
case 'D': return 13;
case 'E': return 14;
case 'F': return 15;
default: return 0;
}
return 0;
}
#if USE_LV_TRIANGLE != 0
/**
* Swap two points
* p1 pointer to the first point
* p2 pointer to the second point
*/
static void point_swap(lv_point_t * p1, lv_point_t * p2)
{
lv_point_t tmp;
tmp.x = p1->x;
tmp.y = p1->y;
p1->x = p2->x;
p1->y = p2->y;
p2->x = tmp.x;
p2->y = tmp.y;
}
#endif
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