Mobile: Draw optimizations; focus handling

Widgets can now be marked for buffering their contents, which is useful if their contents change seldom but they are drawn often.

For example, the navbar is always visible but doesn't change very often, and during animations menu contents are static but there is a moving animation so everything gets drawn 60 FPS.

Focus handling was also improved so the lookup results can be scrolled while entering text, and one can tap outside an input field to unfocus it.

1 files changed, 15 insertions, 3 deletions

diff --git a/src/ui/paint.c b/src/ui/paint.c
index 79adb7d1..af62f908 100644
--- a/src/ui/paint.c
+++ b/src/ui/paint.c
@@ -24,6 +24,8 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */
 
 #include <SDL_version.h>
 
+iInt2 origin_Paint;
+
 iLocalDef SDL_Renderer *renderer_Paint_(const iPaint *d) {
     iAssert(d->dst);
     return d->dst->render;
@@ -62,10 +64,11 @@ void endTarget_Paint(iPaint *d) {
 }
 
 void setClip_Paint(iPaint *d, iRect rect) {
-    rect = intersect_Rect(rect, rect_Root(get_Root()));
+    //rect = intersect_Rect(rect, rect_Root(get_Root()));
     if (isEmpty_Rect(rect)) {
         rect = init_Rect(0, 0, 1, 1);
     }
+    addv_I2(&rect.pos, origin_Paint);
     SDL_RenderSetClipRect(renderer_Paint_(d), (const SDL_Rect *) &rect);
 }
 
@@ -85,6 +88,7 @@ void unsetClip_Paint(iPaint *d) {
 }
 
 void drawRect_Paint(const iPaint *d, iRect rect, int color) {
+    addv_I2(&rect.pos, origin_Paint);
     iInt2 br = bottomRight_Rect(rect);
     /* Keep the right/bottom edge visible in the window. */
     if (br.x == d->dst->size.x) br.x--;
@@ -115,11 +119,14 @@ void drawRectThickness_Paint(const iPaint *d, iRect rect, int thickness, int col
 }
 
 void fillRect_Paint(const iPaint *d, iRect rect, int color) {
+    addv_I2(&rect.pos, origin_Paint);
     setColor_Paint_(d, color);
+//    printf("fillRect_Paint: %d,%d %dx%d\n", rect.pos.x, rect.pos.y, rect.size.x, rect.size.y);
     SDL_RenderFillRect(renderer_Paint_(d), (SDL_Rect *) &rect);
 }
 
 void drawSoftShadow_Paint(const iPaint *d, iRect inner, int thickness, int color, int alpha) {
+    addv_I2(&inner.pos, origin_Paint);
     SDL_Renderer *render = renderer_Paint_(d);
     SDL_Texture *shadow = get_Window()->borderShadow;
     const iInt2 size = size_SDLTexture(shadow);
@@ -146,9 +153,14 @@ void drawSoftShadow_Paint(const iPaint *d, iRect inner, int thickness, int color
                    &(SDL_Rect){ outer.pos.x, inner.pos.y, thickness, inner.size.y });
 }
 
-void drawLines_Paint(const iPaint *d, const iInt2 *points, size_t count, int color) {
+void drawLines_Paint(const iPaint *d, const iInt2 *points, size_t n, int color) {
     setColor_Paint_(d, color);
-    SDL_RenderDrawLines(renderer_Paint_(d), (const SDL_Point *) points, count);
+    iInt2 *offsetPoints = malloc(sizeof(iInt2) * n);
+    for (size_t i = 0; i < n; i++) {
+        offsetPoints[i] = add_I2(points[i], origin_Paint);
+    }
+    SDL_RenderDrawLines(renderer_Paint_(d), (const SDL_Point *) offsetPoints, n);
+    free(offsetPoints);
 }
 
 iInt2 size_SDLTexture(SDL_Texture *d) {