chore(core): remove unused display function

[no changelog]

core/embed/io/display/inc/io/display.h

@@ -150,9 +150,6 @@ void display_fill(const gfx_bitblt_t *bb);
 // Copies an RGB565 bitmap.
 // This function is supported by RGB displays only.
 void display_copy_rgb565(const gfx_bitblt_t *bb);
-// Copies a MONO4 bitmap (supported only with RGB displays).
-// This function is supported by RGB displays only.
-void display_copy_mono4(const gfx_bitblt_t *bb);
 // Copies a MONO1P bitmap.
 // This function is supported by all types of displays.
 void display_copy_mono1p(const gfx_bitblt_t *bb);

core/embed/io/display/ltdc_dsi/display_fb_rgb565.c

@@ -47,18 +47,4 @@ void display_copy_mono1p(const gfx_bitblt_t *bb) {
   gfx_rgb565_copy_mono1p(&bb_new);
 }
 
-void display_copy_mono4(const gfx_bitblt_t *bb) {
-  display_fb_info_t fb;
-
-  if (!display_get_frame_buffer(&fb)) {
-    return;
-  }
-
-  gfx_bitblt_t bb_new = *bb;
-  bb_new.dst_row = (uint8_t *)fb.ptr + (fb.stride * bb_new.dst_y);
-  bb_new.dst_stride = fb.stride;
-
-  gfx_rgb565_copy_mono4(&bb_new);
-}
-
 #endif

core/embed/io/display/ltdc_dsi/display_fb_rgb888.c

@@ -49,17 +49,4 @@ void display_copy_mono1p(const gfx_bitblt_t *bb) {
   gfx_rgba8888_copy_mono1p(&bb_new);
 }
 
-void display_copy_mono4(const gfx_bitblt_t *bb) {
-  display_fb_info_t fb;
-
-  if (!display_get_frame_buffer(&fb)) {
-    return;
-  }
-
-  gfx_bitblt_t bb_new = *bb;
-  bb_new.dst_row = (uint8_t *)fb.ptr + (fb.stride * bb_new.dst_y);
-  bb_new.dst_stride = fb.stride;
-
-  gfx_rgba8888_copy_mono4(&bb_new);
-}
 #endif

core/embed/io/display/st-7789/display_fb.c

@@ -310,18 +310,4 @@ void display_copy_mono1p(const gfx_bitblt_t *bb) {
   gfx_rgb565_copy_mono1p(&bb_new);
 }
 
-void display_copy_mono4(const gfx_bitblt_t *bb) {
-  display_fb_info_t fb;
-
-  if (!display_get_frame_buffer(&fb)) {
-    return;
-  }
-
-  gfx_bitblt_t bb_new = *bb;
-  bb_new.dst_row = (uint16_t *)((uintptr_t)fb.ptr + fb.stride * bb_new.dst_y);
-  bb_new.dst_stride = fb.stride;
-
-  gfx_rgb565_copy_mono4(&bb_new);
-}
-
 #endif  // KERNEL_MODE

core/embed/io/display/st-7789/display_nofb.c

@@ -130,23 +130,4 @@ void display_copy_mono1p(const gfx_bitblt_t* bb) {
   }
 }
 
-void display_copy_mono4(const gfx_bitblt_t* bb) {
-  set_window(bb);
-
-  const gfx_color16_t* gradient =
-      gfx_color16_gradient_a4(bb->src_fg, bb->src_bg);
-
-  uint8_t* src_row = (uint8_t*)bb->src_row;
-  uint16_t height = bb->height;
-
-  while (height-- > 0) {
-    for (int x = 0; x < bb->width; x++) {
-      uint8_t fg_data = src_row[(x + bb->src_x) / 2];
-      uint8_t fg_lum = (x + bb->src_x) & 1 ? fg_data >> 4 : fg_data & 0xF;
-      ISSUE_PIXEL_DATA(gradient[fg_lum]);
-    }
-    src_row += bb->src_stride / sizeof(*src_row);
-  }
-}
-
 #endif  // KERNEL_MODE

core/embed/io/display/stm32f429i-disc1/display_driver.c

@@ -196,18 +196,4 @@ void display_copy_mono1p(const gfx_bitblt_t *bb) {
   gfx_rgb565_copy_mono1p(&bb_new);
 }
 
-void display_copy_mono4(const gfx_bitblt_t *bb) {
-  display_driver_t *drv = &g_display_driver;
-
-  if (!drv->initialized) {
-    return;
-  }
-
-  gfx_bitblt_t bb_new = *bb;
-  bb_new.dst_row = drv->framebuf + (DISPLAY_RESX * bb_new.dst_y);
-  bb_new.dst_stride = DISPLAY_RESX * sizeof(uint16_t);
-
-  gfx_rgb565_copy_mono4(&bb_new);
-}
-
 #endif

core/embed/io/display/unix/display_driver.c

@@ -415,25 +415,6 @@ void display_copy_mono1p(const gfx_bitblt_t *bb) {
 #endif
 }
 
-void display_copy_mono4(const gfx_bitblt_t *bb) {
-  display_driver_t *drv = &g_display_driver;
-
-  if (!drv->initialized) {
-    return;
-  }
-
-  gfx_bitblt_t bb_new = *bb;
-  bb_new.dst_row =
-      (uint8_t *)drv->buffer->pixels + (drv->buffer->pitch * bb_new.dst_y);
-  bb_new.dst_stride = drv->buffer->pitch;
-
-#ifdef UI_COLOR_32BIT
-  gfx_rgba8888_copy_mono4(&bb_new);
-#else
-  gfx_rgb565_copy_mono4(&bb_new);
-#endif
-}
-
 #else  // DISPLAY_MONO
 
 void display_fill(const gfx_bitblt_t *bb) {