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lv_canvas.c
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lv_canvas.c
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/**
* @file lv_canvas.c
*
*/
/*********************
* INCLUDES
*********************/
#include "lv_canvas.h"
#if LV_USE_CANVAS != 0
#include "../../misc/lv_assert.h"
#include "../../misc/lv_math.h"
#include "../../draw/lv_draw.h"
#include "../../core/lv_refr.h"
#include "../../display/lv_display.h"
#include "../../draw/sw/lv_draw_sw.h"
#include "../../stdlib/lv_string.h"
#include "../../misc/cache/lv_cache.h"
/*********************
* DEFINES
*********************/
#define MY_CLASS (&lv_canvas_class)
/**********************
* TYPEDEFS
**********************/
/**********************
* STATIC PROTOTYPES
**********************/
static void lv_canvas_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
static void lv_canvas_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj);
/**********************
* STATIC VARIABLES
**********************/
const lv_obj_class_t lv_canvas_class = {
.constructor_cb = lv_canvas_constructor,
.destructor_cb = lv_canvas_destructor,
.instance_size = sizeof(lv_canvas_t),
.base_class = &lv_image_class,
.name = "canvas",
};
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
lv_obj_t * lv_canvas_create(lv_obj_t * parent)
{
LV_LOG_INFO("begin");
lv_obj_t * obj = lv_obj_class_create_obj(MY_CLASS, parent);
lv_obj_class_init_obj(obj);
return obj;
}
/*=====================
* Setter functions
*====================*/
void lv_canvas_set_buffer(lv_obj_t * obj, void * buf, int32_t w, int32_t h, lv_color_format_t cf)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(buf);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
uint32_t stride = lv_draw_buf_width_to_stride(w, cf);
lv_draw_buf_init(&canvas->static_buf, w, h, cf, stride, buf, stride * h);
canvas->draw_buf = &canvas->static_buf;
const void * src = lv_image_get_src(obj);
if(src) {
lv_image_cache_drop(src);
}
lv_image_set_src(obj, canvas->draw_buf);
lv_image_cache_drop(canvas->draw_buf);
}
void lv_canvas_set_draw_buf(lv_obj_t * obj, lv_draw_buf_t * draw_buf)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(draw_buf);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
canvas->draw_buf = draw_buf;
const void * src = lv_image_get_src(obj);
if(src) {
lv_image_cache_drop(src);
}
lv_image_set_src(obj, draw_buf);
lv_image_cache_drop(draw_buf);
}
void lv_canvas_set_px(lv_obj_t * obj, int32_t x, int32_t y, lv_color_t color, lv_opa_t opa)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
lv_draw_buf_t * draw_buf = canvas->draw_buf;
lv_color_format_t cf = draw_buf->header.cf;
uint32_t stride = draw_buf->header.stride;
uint8_t * data = lv_draw_buf_goto_xy(draw_buf, x, y);
if(LV_COLOR_FORMAT_IS_INDEXED(cf)) {
/*Indexed image bpp could be less than 8, calculate again*/
uint8_t * buf = (uint8_t *)canvas->draw_buf->data;
buf += 8;
buf += y * stride;
buf += x >> 3;
uint32_t bit = 7 - (x & 0x7);
uint32_t c_int = color.blue;
*buf &= ~(1 << bit);
*buf |= c_int << bit;
}
else if(cf == LV_COLOR_FORMAT_L8) {
*data = lv_color_luminance(color);
}
else if(cf == LV_COLOR_FORMAT_A8) {
*data = opa;
}
else if(cf == LV_COLOR_FORMAT_RGB565) {
lv_color16_t * buf = (lv_color16_t *)data;
buf->red = color.red >> 3;
buf->green = color.green >> 2;
buf->blue = color.blue >> 3;
}
else if(cf == LV_COLOR_FORMAT_RGB888) {
data[2] = color.red;
data[1] = color.green;
data[0] = color.blue;
}
else if(cf == LV_COLOR_FORMAT_XRGB8888) {
data[2] = color.red;
data[1] = color.green;
data[0] = color.blue;
data[3] = 0xFF;
}
else if(cf == LV_COLOR_FORMAT_ARGB8888) {
lv_color32_t * buf = (lv_color32_t *)data;
buf->red = color.red;
buf->green = color.green;
buf->blue = color.blue;
buf->alpha = opa;
}
else if(cf == LV_COLOR_FORMAT_AL88) {
lv_color16a_t * buf = (lv_color16a_t *)data;
buf->lumi = lv_color_luminance(color);
buf->alpha = 255;
}
lv_obj_invalidate(obj);
}
void lv_canvas_set_palette(lv_obj_t * obj, uint8_t index, lv_color32_t color)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
lv_draw_buf_set_palette(canvas->draw_buf, index, color);
lv_obj_invalidate(obj);
}
/*=====================
* Getter functions
*====================*/
lv_draw_buf_t * lv_canvas_get_draw_buf(lv_obj_t * obj)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
return canvas->draw_buf;
}
lv_color32_t lv_canvas_get_px(lv_obj_t * obj, int32_t x, int32_t y)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_color32_t ret = { 0 };
lv_canvas_t * canvas = (lv_canvas_t *)obj;
if(canvas->draw_buf == NULL) return ret;
lv_image_header_t * header = &canvas->draw_buf->header;
const uint8_t * px = lv_draw_buf_goto_xy(canvas->draw_buf, x, y);
switch(header->cf) {
case LV_COLOR_FORMAT_ARGB8888:
ret = *(lv_color32_t *)px;
break;
case LV_COLOR_FORMAT_RGB888:
case LV_COLOR_FORMAT_XRGB8888:
ret.red = px[2];
ret.green = px[1];
ret.blue = px[0];
ret.alpha = 0xFF;
break;
case LV_COLOR_FORMAT_RGB565: {
lv_color16_t * c16 = (lv_color16_t *) px;
ret.red = (c16[x].red * 2106) >> 8; /*To make it rounded*/
ret.green = (c16[x].green * 1037) >> 8;
ret.blue = (c16[x].blue * 2106) >> 8;
ret.alpha = 0xFF;
break;
}
case LV_COLOR_FORMAT_A8: {
lv_color_t alpha_color = lv_obj_get_style_image_recolor(obj, LV_PART_MAIN);
ret.red = alpha_color.red;
ret.green = alpha_color.green;
ret.blue = alpha_color.blue;
ret.alpha = px[0];
break;
}
case LV_COLOR_FORMAT_L8: {
ret.red = *px;
ret.green = *px;
ret.blue = *px;
ret.alpha = 0xFF;
break;
}
default:
lv_memzero(&ret, sizeof(lv_color32_t));
break;
}
return ret;
}
lv_image_dsc_t * lv_canvas_get_image(lv_obj_t * obj)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
return (lv_image_dsc_t *)canvas->draw_buf;
}
const void * lv_canvas_get_buf(lv_obj_t * obj)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
if(canvas->draw_buf)
return canvas->draw_buf->unaligned_data;
return NULL;
}
/*=====================
* Other functions
*====================*/
void lv_canvas_copy_buf(lv_obj_t * obj, const lv_area_t * canvas_area, lv_draw_buf_t * dest_buf,
const lv_area_t * dest_area)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
LV_ASSERT_NULL(canvas_area && dest_buf);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
if(canvas->draw_buf == NULL) return;
LV_ASSERT_MSG(canvas->draw_buf->header.cf == dest_buf->header.cf, "Color formats must be the same");
lv_draw_buf_copy(canvas->draw_buf, canvas_area, dest_buf, dest_area);
}
void lv_canvas_fill_bg(lv_obj_t * obj, lv_color_t color, lv_opa_t opa)
{
LV_ASSERT_OBJ(obj, MY_CLASS);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
lv_draw_buf_t * draw_buf = canvas->draw_buf;
if(draw_buf == NULL) return;
lv_image_header_t * header = &draw_buf->header;
uint32_t x;
uint32_t y;
uint32_t stride = header->stride;
uint8_t * data = draw_buf->data;
if(header->cf == LV_COLOR_FORMAT_RGB565) {
uint16_t c16 = lv_color_to_u16(color);
for(y = 0; y < header->h; y++) {
uint16_t * buf16 = (uint16_t *)(data + y * stride);
for(x = 0; x < header->w; x++) {
buf16[x] = c16;
}
}
}
else if(header->cf == LV_COLOR_FORMAT_XRGB8888 || header->cf == LV_COLOR_FORMAT_ARGB8888) {
uint32_t c32 = lv_color_to_u32(color);
if(header->cf == LV_COLOR_FORMAT_ARGB8888) {
c32 &= 0x00ffffff;
c32 |= (uint32_t)opa << 24;
}
for(y = 0; y < header->h; y++) {
uint32_t * buf32 = (uint32_t *)(data + y * stride);
for(x = 0; x < header->w; x++) {
buf32[x] = c32;
}
}
}
else if(header->cf == LV_COLOR_FORMAT_RGB888) {
for(y = 0; y < header->h; y++) {
uint8_t * buf8 = (uint8_t *)(data + y * stride);
for(x = 0; x < header->w * 3; x += 3) {
buf8[x + 0] = color.blue;
buf8[x + 1] = color.green;
buf8[x + 2] = color.red;
}
}
}
else if(header->cf == LV_COLOR_FORMAT_L8) {
uint8_t c8 = lv_color_luminance(color);
for(y = 0; y < header->h; y++) {
uint8_t * buf = (uint8_t *)(data + y * stride);
for(x = 0; x < header->w; x++) {
buf[x] = c8;
}
}
}
else if(header->cf == LV_COLOR_FORMAT_AL88) {
lv_color16a_t c;
c.lumi = lv_color_luminance(color);
c.alpha = 255;
for(y = 0; y < header->h; y++) {
lv_color16a_t * buf = (lv_color16a_t *)(data + y * stride);
for(x = 0; x < header->w; x++) {
buf[x] = c;
}
}
}
else {
for(y = 0; y < header->h; y++) {
for(x = 0; x < header->w; x++) {
lv_canvas_set_px(obj, x, y, color, opa);
}
}
}
lv_obj_invalidate(obj);
}
void lv_canvas_init_layer(lv_obj_t * obj, lv_layer_t * layer)
{
LV_ASSERT_NULL(obj);
LV_ASSERT_NULL(layer);
lv_canvas_t * canvas = (lv_canvas_t *)obj;
if(canvas->draw_buf == NULL) return;
lv_image_header_t * header = &canvas->draw_buf->header;
lv_area_t canvas_area = {0, 0, header->w - 1, header->h - 1};
lv_memzero(layer, sizeof(*layer));
layer->draw_buf = canvas->draw_buf;
layer->color_format = header->cf;
layer->buf_area = canvas_area;
layer->_clip_area = canvas_area;
}
void lv_canvas_finish_layer(lv_obj_t * canvas, lv_layer_t * layer)
{
if(layer->draw_task_head == NULL) return;
while(layer->draw_task_head) {
lv_draw_dispatch_wait_for_request();
lv_draw_dispatch_layer(lv_obj_get_display(canvas), layer);
}
lv_obj_invalidate(canvas);
}
/**********************
* STATIC FUNCTIONS
**********************/
static void lv_canvas_constructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
{
LV_UNUSED(class_p);
LV_UNUSED(obj);
}
static void lv_canvas_destructor(const lv_obj_class_t * class_p, lv_obj_t * obj)
{
LV_UNUSED(class_p);
LV_TRACE_OBJ_CREATE("begin");
lv_canvas_t * canvas = (lv_canvas_t *)obj;
if(canvas->draw_buf == NULL) return;
lv_image_cache_drop(&canvas->draw_buf);
}
#endif