1 /**
2 * @file lv_draw_sdl_label.c
3 *
4 */
5
6 /*********************
7 * INCLUDES
8 *********************/
9
10 #include "../../lv_conf_internal.h"
11
12 #if LV_USE_GPU_SDL
13
14 #include LV_GPU_SDL_INCLUDE_PATH
15
16 #include "../lv_draw_label.h"
17 #include "../../misc/lv_utils.h"
18
19 #include "lv_draw_sdl_utils.h"
20 #include "lv_draw_sdl_texture_cache.h"
21 #include "lv_draw_sdl_composite.h"
22 #include "lv_draw_sdl_layer.h"
23
24 /*********************
25 * DEFINES
26 *********************/
27
28 /**********************
29 * TYPEDEFS
30 **********************/
31
32 typedef struct {
33 lv_sdl_cache_key_magic_t magic;
34 const lv_font_t * font_p;
35 uint32_t letter;
36 } lv_font_glyph_key_t;
37
38 /**********************
39 * STATIC PROTOTYPES
40 **********************/
41
42 static lv_font_glyph_key_t font_key_glyph_create(const lv_font_t * font_p, uint32_t letter);
43
44
45 /**********************
46 * STATIC VARIABLES
47 **********************/
48
49 /**********************
50 * MACROS
51 **********************/
52
53 /**********************
54 * GLOBAL FUNCTIONS
55 **********************/
56
lv_draw_sdl_draw_letter(lv_draw_ctx_t * draw_ctx,const lv_draw_label_dsc_t * dsc,const lv_point_t * pos_p,uint32_t letter)57 void lv_draw_sdl_draw_letter(lv_draw_ctx_t * draw_ctx, const lv_draw_label_dsc_t * dsc, const lv_point_t * pos_p,
58 uint32_t letter)
59 {
60 const lv_area_t * clip_area = draw_ctx->clip_area;
61 const lv_font_t * font_p = dsc->font;
62 lv_opa_t opa = dsc->opa;
63 lv_color_t color = dsc->color;
64 if(opa < LV_OPA_MIN) return;
65 if(opa > LV_OPA_MAX) opa = LV_OPA_COVER;
66
67 if(font_p == NULL) {
68 LV_LOG_WARN("lv_draw_letter: font is NULL");
69 return;
70 }
71
72 lv_font_glyph_dsc_t g;
73 bool g_ret = lv_font_get_glyph_dsc(font_p, &g, letter, '\0');
74 if(g_ret == false) {
75 /*Add warning if the dsc is not found
76 *but do not print warning for non printable ASCII chars (e.g. '\n')*/
77 if(letter >= 0x20 &&
78 letter != 0xf8ff && /*LV_SYMBOL_DUMMY*/
79 letter != 0x200c) { /*ZERO WIDTH NON-JOINER*/
80 LV_LOG_WARN("lv_draw_letter: glyph dsc. not found for U+%X", letter);
81
82 /* draw placeholder */
83 lv_area_t glyph_coords;
84 lv_draw_rect_dsc_t glyph_dsc;
85 lv_coord_t begin_x = pos_p->x + g.ofs_x;
86 lv_coord_t begin_y = pos_p->y + g.ofs_y;
87 lv_area_set(&glyph_coords, begin_x, begin_y, begin_x + g.box_w, begin_y + g.box_h);
88 lv_draw_rect_dsc_init(&glyph_dsc);
89 glyph_dsc.bg_opa = LV_OPA_MIN;
90 glyph_dsc.outline_opa = LV_OPA_MIN;
91 glyph_dsc.shadow_opa = LV_OPA_MIN;
92 glyph_dsc.bg_img_opa = LV_OPA_MIN;
93 glyph_dsc.border_color = dsc->color;
94 glyph_dsc.border_width = 1;
95 draw_ctx->draw_rect(draw_ctx, &glyph_dsc, &glyph_coords);
96 }
97 return;
98 }
99
100 /*Don't draw anything if the character is empty. E.g. space*/
101 if((g.box_h == 0) || (g.box_w == 0)) return;
102
103 int32_t pos_x = pos_p->x + g.ofs_x;
104 int32_t pos_y = pos_p->y + (font_p->line_height - font_p->base_line) - g.box_h - g.ofs_y;
105
106 const lv_area_t letter_area = {pos_x, pos_y, pos_x + g.box_w - 1, pos_y + g.box_h - 1};
107 lv_area_t draw_area;
108
109 /*If the letter is completely out of mask don't draw it*/
110 if(!_lv_area_intersect(&draw_area, &letter_area, clip_area)) {
111 return;
112 }
113
114 lv_draw_sdl_ctx_t * ctx = (lv_draw_sdl_ctx_t *) draw_ctx;
115 SDL_Renderer * renderer = ctx->renderer;
116
117 lv_font_glyph_key_t glyph_key = font_key_glyph_create(font_p, letter);
118 bool glyph_found = false;
119 SDL_Texture * texture = lv_draw_sdl_texture_cache_get(ctx, &glyph_key, sizeof(glyph_key), &glyph_found);
120 if(!glyph_found) {
121 if(g.resolved_font) {
122 font_p = g.resolved_font;
123 }
124 const uint8_t * bmp = lv_font_get_glyph_bitmap(font_p, letter);
125 uint8_t * buf = lv_mem_alloc(g.box_w * g.box_h);
126 lv_sdl_to_8bpp(buf, bmp, g.box_w, g.box_h, g.box_w, g.bpp);
127 SDL_Surface * mask = lv_sdl_create_opa_surface(buf, g.box_w, g.box_h, g.box_w);
128 texture = SDL_CreateTextureFromSurface(renderer, mask);
129 SDL_FreeSurface(mask);
130 lv_mem_free(buf);
131 lv_draw_sdl_texture_cache_put(ctx, &glyph_key, sizeof(glyph_key), texture);
132 }
133 if(!texture) {
134 return;
135 }
136
137 lv_area_t t_letter = letter_area, t_clip = *clip_area, apply_area;
138 bool has_composite = lv_draw_sdl_composite_begin(ctx, &letter_area, clip_area, NULL, dsc->blend_mode, &t_letter,
139 &t_clip, &apply_area);
140
141 lv_draw_sdl_transform_areas_offset(ctx, has_composite, &apply_area, &t_letter, &t_clip);
142
143 /*If the letter is completely out of mask don't draw it*/
144 if(!_lv_area_intersect(&draw_area, &t_letter, &t_clip)) {
145 return;
146 }
147 SDL_Rect srcrect, dstrect;
148 lv_area_to_sdl_rect(&draw_area, &dstrect);
149 srcrect.x = draw_area.x1 - t_letter.x1;
150 srcrect.y = draw_area.y1 - t_letter.y1;
151 srcrect.w = dstrect.w;
152 srcrect.h = dstrect.h;
153 SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
154 SDL_SetTextureAlphaMod(texture, opa);
155 SDL_SetTextureColorMod(texture, color.ch.red, color.ch.green, color.ch.blue);
156 SDL_RenderCopy(renderer, texture, &srcrect, &dstrect);
157
158 lv_draw_sdl_composite_end(ctx, &apply_area, dsc->blend_mode);
159 }
160
161 /**********************
162 * STATIC FUNCTIONS
163 **********************/
164
font_key_glyph_create(const lv_font_t * font_p,uint32_t letter)165 static lv_font_glyph_key_t font_key_glyph_create(const lv_font_t * font_p, uint32_t letter)
166 {
167 lv_font_glyph_key_t key;
168 /* VERY IMPORTANT! Padding between members is uninitialized, so we have to wipe them manually */
169 SDL_memset(&key, 0, sizeof(key));
170 key.magic = LV_GPU_CACHE_KEY_MAGIC_FONT_GLYPH;
171 key.font_p = font_p;
172 key.letter = letter;
173 return key;
174 }
175
176 #endif /*LV_USE_GPU_SDL*/
177
