void framebuffer_update_display( DisplaySurface *ds, MemoryRegionSection *mem_section, int cols, /* Width in pixels. */ int rows, /* Height in pixels. */ int src_width, /* Length of source line, in bytes. */ int dest_row_pitch, /* Bytes between adjacent horizontal output pixels. */ int dest_col_pitch, /* Bytes between adjacent vertical output pixels. */ int invalidate, /* nonzero to redraw the whole image. */ drawfn fn, void *opaque, int *first_row, /* Input and output. */ int *last_row /* Output only */) { hwaddr src_len; uint8_t *dest; uint8_t *src; int first, last = 0; int dirty; int i; ram_addr_t addr; MemoryRegion *mem; i = *first_row; *first_row = -1; src_len = src_width * rows; mem = mem_section->mr; if (!mem) { return; } memory_region_sync_dirty_bitmap(mem); addr = mem_section->offset_within_region; src = memory_region_get_ram_ptr(mem) + addr; dest = surface_data(ds); if (dest_col_pitch < 0) { dest -= dest_col_pitch * (cols - 1); } if (dest_row_pitch < 0) { dest -= dest_row_pitch * (rows - 1); } first = -1; addr += i * src_width; src += i * src_width; dest += i * dest_row_pitch; for (; i < rows; i++) { dirty = memory_region_get_dirty(mem, addr, src_width, DIRTY_MEMORY_VGA); if (dirty || invalidate) { fn(opaque, dest, src, cols, dest_col_pitch); if (first == -1) first = i; last = i; } addr += src_width; src += src_width; dest += dest_row_pitch; } if (first < 0) { return; } memory_region_reset_dirty(mem, mem_section->offset_within_region, src_len, DIRTY_MEMORY_VGA); *first_row = first; *last_row = last; }