134 lines
4.0 KiB
C
134 lines
4.0 KiB
C
/**
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* @file lv_draw_sdl_polygon.c
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*
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*/
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/*********************
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* INCLUDES
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*********************/
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#include "../../lv_conf_internal.h"
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#if LV_USE_GPU_SDL
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#include "lv_draw_sdl.h"
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#include "lv_draw_sdl_utils.h"
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#include "lv_draw_sdl_texture_cache.h"
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#include "lv_draw_sdl_composite.h"
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/*********************
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* DEFINES
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*********************/
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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/**********************
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* STATIC VARIABLES
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**********************/
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/**********************
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* MACROS
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**********************/
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static void dump_masks(SDL_Texture * texture, const lv_area_t * coords);
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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void lv_draw_sdl_polygon(lv_draw_ctx_t * draw_ctx, const lv_draw_rect_dsc_t * draw_dsc, const lv_point_t * points,
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uint16_t point_cnt)
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{
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if(point_cnt < 3) return;
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if(points == NULL) return;
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lv_draw_mask_polygon_param_t polygon_param;
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lv_draw_mask_polygon_init(&polygon_param, points, point_cnt);
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if(polygon_param.cfg.point_cnt < 3) {
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lv_draw_mask_free_param(&polygon_param);
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return;
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}
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lv_area_t poly_coords = {.x1 = LV_COORD_MAX, .y1 = LV_COORD_MAX, .x2 = LV_COORD_MIN, .y2 = LV_COORD_MIN};
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uint16_t i;
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for(i = 0; i < point_cnt; i++) {
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poly_coords.x1 = LV_MIN(poly_coords.x1, polygon_param.cfg.points[i].x);
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poly_coords.y1 = LV_MIN(poly_coords.y1, polygon_param.cfg.points[i].y);
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poly_coords.x2 = LV_MAX(poly_coords.x2, polygon_param.cfg.points[i].x);
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poly_coords.y2 = LV_MAX(poly_coords.y2, polygon_param.cfg.points[i].y);
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}
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bool is_common;
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lv_area_t draw_area;
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is_common = _lv_area_intersect(&draw_area, &poly_coords, draw_ctx->clip_area);
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if(!is_common) {
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lv_draw_mask_free_param(&polygon_param);
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return;
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}
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lv_draw_sdl_ctx_t * ctx = (lv_draw_sdl_ctx_t *) draw_ctx;
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int16_t mask_id = lv_draw_mask_add(&polygon_param, NULL);
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lv_coord_t w = lv_area_get_width(&draw_area), h = lv_area_get_height(&draw_area);
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SDL_Texture * texture = lv_draw_sdl_composite_texture_obtain(ctx, LV_DRAW_SDL_COMPOSITE_TEXTURE_ID_STREAM1, w, h);
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SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
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dump_masks(texture, &draw_area);
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lv_draw_mask_remove_id(mask_id);
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lv_draw_mask_free_param(&polygon_param);
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SDL_Rect srcrect = {0, 0, w, h}, dstrect;
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lv_area_to_sdl_rect(&draw_area, &dstrect);
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SDL_Color color;
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lv_color_to_sdl_color(&draw_dsc->bg_color, &color);
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SDL_SetTextureColorMod(texture, color.r, color.g, color.b);
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SDL_SetTextureAlphaMod(texture, draw_dsc->bg_opa);
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SDL_RenderCopy(ctx->renderer, texture, &srcrect, &dstrect);
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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static void dump_masks(SDL_Texture * texture, const lv_area_t * coords)
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{
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lv_coord_t w = lv_area_get_width(coords), h = lv_area_get_height(coords);
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SDL_assert(w > 0 && h > 0);
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SDL_Rect rect = {0, 0, w, h};
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uint8_t * pixels;
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int pitch;
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if(SDL_LockTexture(texture, &rect, (void **) &pixels, &pitch) != 0) return;
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lv_opa_t * line_buf = lv_mem_buf_get(rect.w);
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for(lv_coord_t y = 0; y < rect.h; y++) {
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lv_memset_ff(line_buf, rect.w);
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lv_coord_t abs_x = (lv_coord_t) coords->x1, abs_y = (lv_coord_t)(y + coords->y1), len = (lv_coord_t) rect.w;
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lv_draw_mask_res_t res;
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res = lv_draw_mask_apply(line_buf, abs_x, abs_y, len);
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if(res == LV_DRAW_MASK_RES_TRANSP) {
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lv_memset_00(&pixels[y * pitch], 4 * rect.w);
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}
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else if(res == LV_DRAW_MASK_RES_FULL_COVER) {
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lv_memset_ff(&pixels[y * pitch], 4 * rect.w);
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}
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else {
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for(int x = 0; x < rect.w; x++) {
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uint8_t * pixel = &pixels[y * pitch + x * 4];
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*pixel = line_buf[x];
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pixel[1] = pixel[2] = pixel[3] = 0xFF;
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}
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}
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}
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lv_mem_buf_release(line_buf);
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SDL_UnlockTexture(texture);
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}
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#endif /*LV_USE_GPU_SDL*/
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