static int
__GraphLayer_GetLayers(
LCUI_GraphLayer *root_glayer,
LCUI_GraphLayer *glayer,
LCUI_Rect rect, LCUI_Queue *queue )
{
int i, total;
LCUI_Pos pos;
LCUI_Rect tmp;
LCUI_GraphLayer *child;
LCUI_Queue *child_list;
if( !glayer ) {
//_DEBUG_MSG("!glayer\n");
return -1;
}
if( !glayer->visible ) {
//_DEBUG_MSG("!glayer_visible\n");
return 1;
}
child_list = &glayer->child;
/* 从底到顶遍历子部件 */
total = Queue_GetTotal( child_list );
//_DEBUG_MSG( "root: %p, cur: %p, child total: %d\n",
// root_glayer, glayer, total );
/* 从尾到首，从底到顶，遍历图层 */
for( i=total-1; i>=0; --i ) {
child = (LCUI_GraphLayer*)Queue_Get( child_list, i );
/* 忽略无效或不可见的图层 */
if( !child || !child->visible ) {
continue;
}
/* 获取子图层的有效区域及全局坐标 */
tmp = GraphLayer_GetValidRect( root_glayer, child );
pos = GraphLayer_GetGlobalPos( root_glayer, child );
//_DEBUG_MSG( "child: %p, pos: %d,%d, valid rect: %d,%d, %d, %d\n",
// child, pos.x, pos.y, tmp.x, tmp.y, tmp.width, tmp.height);
//Graph_PrintInfo( &child->graph );
/* 有效区域加上子部件的全局坐标 */
tmp.x += pos.x;
tmp.y += pos.y;
/* 判断区域是否有效 */
if( !LCUIRect_IsValid(tmp) ) {
continue;
}
/* 若该有效区域与目标区域重叠，则记录子部件，并进行递归 */
if( LCUIRect_Overlay(tmp, rect) ) {
Queue_AddPointer( queue, child );
__GraphLayer_GetLayers( root_glayer,
child, rect, queue );
}
}
return 0;
}
LCUI_API LCUI_Pos
GraphLayer_GetGlobalPos( LCUI_GraphLayer *root_glayer,
LCUI_GraphLayer *glayer )
{
LCUI_Pos pos;
if( !glayer || !root_glayer || glayer == root_glayer ) {
return Pos(0,0);
}
/* 递归获取父图层的全局坐标 */
pos = GraphLayer_GetGlobalPos( root_glayer, glayer->parent );
pos.x += glayer->pos.x;
pos.y += glayer->pos.y;
if( glayer->parent ) {
/* 加上内边距 */
pos.x += glayer->parent->padding.left;
pos.y += glayer->parent->padding.top;
}
return pos;
}
LCUI_API int GraphLayer_GetGraph( LCUI_GraphLayer *ctnr,
LCUI_Graph *graph_buff, LCUI_Rect rect )
{
int i, total;
uchar_t tmp_alpha, alpha;
LCUI_Pos pos, glayer_pos;
LCUI_GraphLayer *glayer;
LCUI_Queue glayerQ;
LCUI_Rect valid_area;
LCUI_Graph tmp_graph;
/* 检测这个区域是否有效 */
if (rect.x < 0 || rect.y < 0) {
return -1;
}
if (rect.x + rect.width > ctnr->graph.w
|| rect.y + rect.height > ctnr->graph.h ) {
return -1;
}
if (rect.width <= 0 || rect.height <= 0) {
return -2;
}
if( !Graph_IsValid(graph_buff) ) {
graph_buff->color_type = COLOR_TYPE_ARGB;
Graph_Create( graph_buff, rect.width, rect.height );
}
Graph_Init( &tmp_graph );
Queue_Init( &glayerQ, 0, NULL);
Queue_UsingPointer( &glayerQ );
/* 获取rect区域内的图层列表 */
GraphLayer_GetLayers( ctnr, rect, &glayerQ );
total = Queue_GetTotal( &glayerQ );
DEBUG_MSG( "total: %d\n", total );
/* 若记录数为零，则表明该区域没有图层 */
if( total <= 0 ) {
/* 若没有父图层，则填充白色 */
if( ctnr == NULL ) {
Graph_FillColor( graph_buff, RGB(255,255,255) );
} else { /* 否则使用父图层的图形 */
Graph_Cut( &ctnr->graph, rect, graph_buff );
}
/* 销毁记录 */
Queue_Destroy( &glayerQ );
return 0;
}
/* 从顶层到底层遍历图层，排除被其它图层完全遮挡或者自身完全透明的图层 */
for(i=total-1; i>=0; --i) {
glayer = (LCUI_GraphLayer*)Queue_Get( &glayerQ, i );
valid_area = GraphLayer_GetValidRect( ctnr, glayer );
glayer_pos = GraphLayer_GetGlobalPos( ctnr, glayer );
valid_area.x += glayer_pos.x;
valid_area.y += glayer_pos.y;
alpha = GraphLayer_GetRealAlpha( glayer );
/* 当前图层的透明度小于255的话，就跳过 */
if( alpha < 255 ) {
continue;
}
/* 跳过有alpha通道的图层 */
if( glayer->graph.color_type == COLOR_TYPE_ARGB ) {
continue;
}
/* 如果该图层的有效区域包含目标区域 */
if( rect.x >= valid_area.x && rect.y >= valid_area.y
&& rect.x + rect.w <= valid_area.x + valid_area.w
&& rect.y + rect.h <= valid_area.y + valid_area.h ) {
/* 移除底层的图层，因为已经被完全遮挡 */
for(total=i-1;total>=0; --total) {
Queue_DeletePointer( &glayerQ, 0 );
}
goto skip_loop;
}
}
skip_loop:
total = Queue_GetTotal( &glayerQ );
DEBUG_MSG( "total: %d\n", total );
if(i <= 0 && ctnr ) {
Graph_Cut( &ctnr->graph, rect, graph_buff );
}
/* 获取图层列表中的图层 */
for(i=0; i<total; ++i) {
glayer = (LCUI_GraphLayer*)Queue_Get( &glayerQ, i );
//_DEBUG_MSG("%p = Queue_Get( %p, %d )\n", glayer, &glayerQ, i);
if( !glayer ) {
continue;
}
DEBUG_MSG("%d,%d,%d,%d\n", glayer->pos.x, glayer->pos.y, glayer->graph.w, glayer->graph.h);
/* 获取该图层的有效区域及全局坐标 */
pos = GraphLayer_GetGlobalPos( ctnr, glayer );
valid_area = GraphLayer_GetValidRect( ctnr, glayer );
/* 引用该图层的有效区域内的图像 */
Graph_Quote( &tmp_graph, &glayer->graph, valid_area );
//_DEBUG_MSG("valid area: %d,%d,%d,%d, pos: %d,%d, size: %d,%d\n",
// valid_area.x, valid_area.y, valid_area.width, valid_area.height,
// pos.x, pos.y, glayer->graph.w, glayer->graph.h
// );
/* 获取相对坐标 */
pos.x = pos.x - rect.x + valid_area.x;
pos.y = pos.y - rect.y + valid_area.y;
//_DEBUG_MSG("mix pos: %d,%d\n", pos.x, pos.y);
/* 如果该图层没有继承父图层的透明度 */
if( !glayer->inherit_alpha ) {
/* 直接叠加至graph_buff */
Graph_Mix( graph_buff, &tmp_graph, pos );
} else {
/* 否则，计算该图层应有的透明度 */
alpha = GraphLayer_GetRealAlpha( glayer );
/* 备份该图层的全局透明度 */
tmp_alpha = glayer->graph.alpha;
/* 将实际透明度作为全局透明度，参与图像叠加 */
glayer->graph.alpha = alpha;
Graph_Mix( graph_buff, &tmp_graph, pos );
/* 还原全局透明度 */
glayer->graph.alpha = tmp_alpha;
}
}
Queue_Destroy( &glayerQ );
return 0;
}
