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 * STATIC VARIABLES
46 **********************/
47
48 /**********************
49 * MACROS
50 **********************/
51
52 /**********************
53 * GLOBAL FUNCTIONS
54 **********************/
55
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)56 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,
57 uint32_t letter)
58 {
59 const lv_area_t * clip_area = draw_ctx->clip_area;
60 const lv_font_t * font_p = dsc->font;
61 lv_opa_t opa = dsc->opa;
62 lv_color_t color = dsc->color;
63 if(opa < LV_OPA_MIN) return;
64 if(opa > LV_OPA_MAX) opa = LV_OPA_COVER;
65
66 if(font_p == NULL) {
67 LV_LOG_WARN("lv_draw_letter: font is NULL");
68 return;
69 }
70
71 lv_font_glyph_dsc_t g;
72 bool g_ret = lv_font_get_glyph_dsc(font_p, &g, letter, '\0');
73 if(g_ret == false) {
74 /*Add warning if the dsc is not found
75 *but do not print warning for non printable ASCII chars (e.g. '\n')*/
76 if(letter >= 0x20 &&
77 letter != 0xf8ff && /*LV_SYMBOL_DUMMY*/
78 letter != 0x200c) { /*ZERO WIDTH NON-JOINER*/
79 LV_LOG_WARN("lv_draw_letter: glyph dsc. not found for U+%X", letter);
80
81 /* draw placeholder */
82 lv_area_t glyph_coords;
83 lv_draw_rect_dsc_t glyph_dsc;
84 lv_coord_t begin_x = pos_p->x + g.ofs_x;
85 lv_coord_t begin_y = pos_p->y + g.ofs_y;
86 lv_area_set(&glyph_coords, begin_x, begin_y, begin_x + g.box_w, begin_y + g.box_h);
87 lv_draw_rect_dsc_init(&glyph_dsc);
88 glyph_dsc.bg_opa = LV_OPA_MIN;
89 glyph_dsc.outline_opa = LV_OPA_MIN;
90 glyph_dsc.shadow_opa = LV_OPA_MIN;
91 glyph_dsc.bg_img_opa = LV_OPA_MIN;
92 glyph_dsc.border_color = dsc->color;
93 glyph_dsc.border_width = 1;
94 draw_ctx->draw_rect(draw_ctx, &glyph_dsc, &glyph_coords);
95 }
96 return;
97 }
98
99 /*Don't draw anything if the character is empty. E.g. space*/
100 if((g.box_h == 0) || (g.box_w == 0)) return;
101
102 int32_t pos_x = pos_p->x + g.ofs_x;
103 int32_t pos_y = pos_p->y + (font_p->line_height - font_p->base_line) - g.box_h - g.ofs_y;
104
105 const lv_area_t letter_area = {pos_x, pos_y, pos_x + g.box_w - 1, pos_y + g.box_h - 1};
106 lv_area_t draw_area;
107
108 /*If the letter is completely out of mask don't draw it*/
109 if(!_lv_area_intersect(&draw_area, &letter_area, clip_area)) {
110 return;
111 }
112
113 lv_draw_sdl_ctx_t * ctx = (lv_draw_sdl_ctx_t *) draw_ctx;
114 SDL_Renderer * renderer = ctx->renderer;
115
116 lv_font_glyph_key_t glyph_key = font_key_glyph_create(font_p, letter);
117 bool glyph_found = false;
118 SDL_Texture * texture = lv_draw_sdl_texture_cache_get(ctx, &glyph_key, sizeof(glyph_key), &glyph_found);
119 bool in_cache = false;
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 in_cache = lv_draw_sdl_texture_cache_put(ctx, &glyph_key, sizeof(glyph_key), texture);
132 }
133 else {
134 in_cache = true;
135 }
136 if(!texture) {
137 return;
138 }
139
140 lv_area_t t_letter = letter_area, t_clip = *clip_area, apply_area;
141 bool has_composite = lv_draw_sdl_composite_begin(ctx, &letter_area, clip_area, NULL, dsc->blend_mode, &t_letter,
142 &t_clip, &apply_area);
143
144 lv_draw_sdl_transform_areas_offset(ctx, has_composite, &apply_area, &t_letter, &t_clip);
145
146 /*If the letter is completely out of mask don't draw it*/
147 if(!_lv_area_intersect(&draw_area, &t_letter, &t_clip)) {
148 if(!in_cache) {
149 LV_LOG_WARN("Texture is not cached, this will impact performance.");
150 SDL_DestroyTexture(texture);
151 }
152 return;
153 }
154 SDL_Rect srcrect, dstrect;
155 lv_area_to_sdl_rect(&draw_area, &dstrect);
156 srcrect.x = draw_area.x1 - t_letter.x1;
157 srcrect.y = draw_area.y1 - t_letter.y1;
158 srcrect.w = dstrect.w;
159 srcrect.h = dstrect.h;
160 SDL_SetTextureBlendMode(texture, SDL_BLENDMODE_BLEND);
161 SDL_SetTextureAlphaMod(texture, opa);
162 SDL_SetTextureColorMod(texture, color.ch.red, color.ch.green, color.ch.blue);
163 SDL_RenderCopy(renderer, texture, &srcrect, &dstrect);
164
165 lv_draw_sdl_composite_end(ctx, &apply_area, dsc->blend_mode);
166
167 if(!in_cache) {
168 LV_LOG_WARN("Texture is not cached, this will impact performance.");
169 SDL_DestroyTexture(texture);
170 }
171 }
172
173 /**********************
174 * STATIC FUNCTIONS
175 **********************/
176
font_key_glyph_create(const lv_font_t * font_p,uint32_t letter)177 static lv_font_glyph_key_t font_key_glyph_create(const lv_font_t * font_p, uint32_t letter)
178 {
179 lv_font_glyph_key_t key;
180 /* VERY IMPORTANT! Padding between members is uninitialized, so we have to wipe them manually */
181 SDL_memset(&key, 0, sizeof(key));
182 key.magic = LV_GPU_CACHE_KEY_MAGIC_FONT_GLYPH;
183 key.font_p = font_p;
184 key.letter = letter;
185 return key;
186 }
187
188 #endif /*LV_USE_GPU_SDL*/
189
