/**
  * @file lv_draw_sdl_composite.c
  *
  */
 
 /*********************
  *      INCLUDES
  *********************/
 #include "../../lv_conf_internal.h"
 
 #if LV_USE_GPU_SDL
 
 #include "../../misc/lv_gc.h"
 #include "../../core/lv_refr.h"
 #include "lv_draw_sdl_composite.h"
 #include "lv_draw_sdl_mask.h"
 #include "lv_draw_sdl_utils.h"
 #include "lv_draw_sdl_priv.h"
 #include "lv_draw_sdl_texture_cache.h"
 
 /*********************
  *      DEFINES
  *********************/
 
 /**********************
  *      TYPEDEFS
  **********************/
 
 typedef struct {
     lv_sdl_cache_key_magic_t magic;
     lv_draw_sdl_composite_texture_id_t type;
 } composite_key_t;
 
 /**********************
  *  STATIC PROTOTYPES
  **********************/
 
 static composite_key_t mask_key_create(lv_draw_sdl_composite_texture_id_t type);
 
 static lv_coord_t next_pow_of_2(lv_coord_t num);
 
 static void dump_masks(SDL_Texture * texture, const lv_area_t * coords);
 /**********************
  *  STATIC VARIABLES
  **********************/
 
 /**********************
  *      MACROS
  **********************/
 
 /**********************
  *   GLOBAL FUNCTIONS
  **********************/
 
 bool lv_draw_sdl_composite_begin(lv_draw_sdl_ctx_t * ctx, const lv_area_t * coords_in, const lv_area_t * clip_in,
                                  const lv_area_t * extension, lv_blend_mode_t blend_mode, lv_area_t * coords_out,
                                  lv_area_t * clip_out, lv_area_t * apply_area)
 {
     lv_area_t full_coords = *coords_in;
 
     /* Normalize full_coords */
     if(full_coords.x1 > full_coords.x2) {
         lv_coord_t x2 = full_coords.x2;
         full_coords.x2 = full_coords.x1;
         full_coords.x1 = x2;
     }
     if(full_coords.y1 > full_coords.y2) {
         lv_coord_t y2 = full_coords.y2;
         full_coords.y2 = full_coords.y1;
         full_coords.y1 = y2;
     }
 
     if(extension) {
         full_coords.x1 -= extension->x1;
         full_coords.x2 += extension->x2;
         full_coords.y1 -= extension->y1;
         full_coords.y2 += extension->y2;
     }
 
     if(!_lv_area_intersect(apply_area, &full_coords, clip_in)) return false;
     bool has_mask = lv_draw_mask_is_any(apply_area);
 
     const bool draw_mask = has_mask && LV_GPU_SDL_CUSTOM_BLEND_MODE;
     const bool draw_blend = blend_mode != LV_BLEND_MODE_NORMAL;
     if(draw_mask || draw_blend) {
         lv_draw_sdl_context_internals_t * internals = ctx->internals;
         LV_ASSERT(internals->mask == NULL && internals->composition == NULL);
 
         lv_coord_t w = lv_area_get_width(apply_area), h = lv_area_get_height(apply_area);
         internals->composition = lv_draw_sdl_composite_texture_obtain(ctx, LV_DRAW_SDL_COMPOSITE_TEXTURE_ID_TARGET0, w, h);
         /* Don't need to worry about overflow */
         lv_coord_t ofs_x = (lv_coord_t) - apply_area->x1, ofs_y = (lv_coord_t) - apply_area->y1;
         /* Offset draw area to start with (0,0) of coords */
         lv_area_move(coords_out, ofs_x, ofs_y);
         lv_area_move(clip_out, ofs_x, ofs_y);
         SDL_SetRenderTarget(ctx->renderer, internals->composition);
         SDL_SetRenderDrawColor(ctx->renderer, 255, 255, 255, 0);
         SDL_RenderClear(ctx->renderer);
 #if LV_GPU_SDL_CUSTOM_BLEND_MODE
         internals->mask = lv_draw_sdl_composite_texture_obtain(ctx, LV_DRAW_SDL_COMPOSITE_TEXTURE_ID_STREAM0, w, h);
         dump_masks(internals->mask, apply_area);
 #endif
     }
     else if(has_mask) {
         /* Fallback mask handling. This will at least make bars looks less bad */
         for(uint8_t i = 0; i < _LV_MASK_MAX_NUM; i++) {
             _lv_draw_mask_common_dsc_t * comm_param = LV_GC_ROOT(_lv_draw_mask_list[i]).param;
             if(comm_param == NULL) continue;
             switch(comm_param->type) {
                 case LV_DRAW_MASK_TYPE_RADIUS: {
                         const lv_draw_mask_radius_param_t * param = (const lv_draw_mask_radius_param_t *) comm_param;
                         if(param->cfg.outer) break;
                         _lv_area_intersect(clip_out, apply_area, &param->cfg.rect);
                         break;
                     }
                 default:
                     break;
             }
         }
     }
     return has_mask;
 }
 
 void lv_draw_sdl_composite_end(lv_draw_sdl_ctx_t * ctx, const lv_area_t * apply_area, lv_blend_mode_t blend_mode)
 {
     lv_draw_sdl_context_internals_t * internals = ctx->internals;
     SDL_Rect src_rect = {0, 0, lv_area_get_width(apply_area), lv_area_get_height(apply_area)};
 #if LV_GPU_SDL_CUSTOM_BLEND_MODE
     if(internals->mask) {
         SDL_BlendMode mode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_ONE,
                                                         SDL_BLENDOPERATION_ADD, SDL_BLENDFACTOR_ZERO,
                                                         SDL_BLENDFACTOR_SRC_ALPHA, SDL_BLENDOPERATION_ADD);
         SDL_SetTextureBlendMode(internals->mask, mode);
         SDL_RenderCopy(ctx->renderer, internals->mask, &src_rect, &src_rect);
     }
 #endif
 
     /* Shapes are drawn on composite layer when mask or blend mode is present */
     if(internals->composition) {
         SDL_Rect dst_rect;
         lv_area_to_sdl_rect(apply_area, &dst_rect);
 
         SDL_SetRenderTarget(ctx->renderer, ctx->base_draw.buf);
         switch(blend_mode) {
             case LV_BLEND_MODE_NORMAL:
                 SDL_SetTextureBlendMode(internals->composition, SDL_BLENDMODE_BLEND);
                 break;
             case LV_BLEND_MODE_ADDITIVE:
                 SDL_SetTextureBlendMode(internals->composition, SDL_BLENDMODE_ADD);
                 break;
 #if LV_GPU_SDL_CUSTOM_BLEND_MODE
             case LV_BLEND_MODE_SUBTRACTIVE: {
                     SDL_BlendMode mode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_ONE, SDL_BLENDFACTOR_ONE,
                                                                     SDL_BLENDOPERATION_SUBTRACT, SDL_BLENDFACTOR_ONE,
                                                                     SDL_BLENDFACTOR_ONE, SDL_BLENDOPERATION_SUBTRACT);
                     SDL_SetTextureBlendMode(internals->composition, mode);
                     break;
                 }
             case LV_BLEND_MODE_MULTIPLY: {
                     SDL_BlendMode mode = SDL_ComposeCustomBlendMode(SDL_BLENDFACTOR_ZERO, SDL_BLENDFACTOR_SRC_COLOR,
                                                                     SDL_BLENDOPERATION_ADD, SDL_BLENDFACTOR_ZERO,
                                                                     SDL_BLENDFACTOR_DST_ALPHA, SDL_BLENDOPERATION_ADD);
                     SDL_SetTextureBlendMode(internals->composition, mode);
                     break;
                 }
 #endif
             default:
                 LV_LOG_WARN("Doesn't support blend mode %d", blend_mode);
                 SDL_SetTextureBlendMode(internals->composition, SDL_BLENDMODE_BLEND);
                 /* Unsupported yet */
                 break;
         }
         SDL_RenderCopy(ctx->renderer, internals->composition, &src_rect, &dst_rect);
     }
 
     internals->mask = internals->composition = NULL;
 }
 
 SDL_Texture * lv_draw_sdl_composite_texture_obtain(lv_draw_sdl_ctx_t * ctx, lv_draw_sdl_composite_texture_id_t id,
                                                    lv_coord_t w, lv_coord_t h)
 {
     lv_point_t * tex_size = NULL;
     composite_key_t mask_key = mask_key_create(id);
     SDL_Texture * result = lv_draw_sdl_texture_cache_get_with_userdata(ctx, &mask_key, sizeof(composite_key_t), NULL,
                                                                        (void **) &tex_size);
     if(!result || tex_size->x < w || tex_size->y < h) {
         lv_coord_t size = next_pow_of_2(LV_MAX(w, h));
         int access = SDL_TEXTUREACCESS_STREAMING;
         if(id >= LV_DRAW_SDL_COMPOSITE_TEXTURE_ID_TARGET0) {
             access = SDL_TEXTUREACCESS_TARGET;
         }
         result = SDL_CreateTexture(ctx->renderer, LV_DRAW_SDL_TEXTURE_FORMAT, access, size, size);
         tex_size = lv_mem_alloc(sizeof(lv_point_t));
         tex_size->x = tex_size->y = size;
         lv_draw_sdl_texture_cache_put_advanced(ctx, &mask_key, sizeof(composite_key_t), result, tex_size, lv_mem_free, 0);
     }
     return result;
 }
 
 /**********************
  *   STATIC FUNCTIONS
  **********************/
 
 static composite_key_t mask_key_create(lv_draw_sdl_composite_texture_id_t type)
 {
     composite_key_t key;
     /* VERY IMPORTANT! Padding between members is uninitialized, so we have to wipe them manually */
     SDL_memset(&key, 0, sizeof(key));
     key.magic = LV_GPU_CACHE_KEY_MAGIC_MASK;
     key.type = type;
     return key;
 }
 
 static lv_coord_t next_pow_of_2(lv_coord_t num)
 {
     lv_coord_t n = 128;
     while(n < num && n < 16384) {
         n = n << 1;
     }
     return n;
 }
 
 static void dump_masks(SDL_Texture * texture, const lv_area_t * coords)
 {
     lv_coord_t w = lv_area_get_width(coords), h = lv_area_get_height(coords);
     SDL_assert(w > 0 && h > 0);
     SDL_Rect rect = {0, 0, w, h};
     uint8_t * pixels;
     int pitch;
     if(SDL_LockTexture(texture, &rect, (void **) &pixels, &pitch) != 0) return;
 
     lv_opa_t * line_buf = lv_mem_buf_get(rect.w);
     for(lv_coord_t y = 0; y < rect.h; y++) {
         lv_memset_ff(line_buf, rect.w);
         lv_coord_t abs_x = (lv_coord_t) coords->x1, abs_y = (lv_coord_t)(y + coords->y1), len = (lv_coord_t) rect.w;
         lv_draw_mask_res_t res;
         res = lv_draw_mask_apply(line_buf, abs_x, abs_y, len);
         if(res == LV_DRAW_MASK_RES_TRANSP) {
             lv_memset_00(&pixels[y * pitch], 4 * rect.w);
         }
         else if(res == LV_DRAW_MASK_RES_FULL_COVER) {
             lv_memset_ff(&pixels[y * pitch], 4 * rect.w);
         }
         else {
             for(int x = 0; x < rect.w; x++) {
                 const size_t idx = y * pitch + x * 4;
                 pixels[idx] = line_buf[x];
                 pixels[idx + 1] = pixels[idx + 2] = pixels[idx + 3] = 0xFF;
             }
         }
     }
     lv_mem_buf_release(line_buf);
     SDL_UnlockTexture(texture);
 }
 
 #endif /*LV_USE_GPU_SDL*/

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