hw/display/framebuffer.c

   1 /*
   2  * Framebuffer device helper routines
   3  *
   4  * Copyright (c) 2009 CodeSourcery
   5  * Written by Paul Brook <paul@codesourcery.com>
   6  *
   7  * This code is licensed under the GNU GPLv2.
   8  *
   9  * Contributions after 2012-01-13 are licensed under the terms of the
  10  * GNU GPL, version 2 or (at your option) any later version.
  11  */
  12
  13 /* TODO:
  14    - Do something similar for framebuffers with local ram
  15    - Handle rotation here instead of hacking dest_pitch
  16    - Use common pixel conversion routines instead of per-device drawfn
  17    - Remove all DisplayState knowledge from devices.
  18  */
  19
  20 #include "qemu/osdep.h"
  21 #include "hw/hw.h"
  22 #include "ui/console.h"
  23 #include "framebuffer.h"
  24
  25 void framebuffer_update_memory_section(
  26     MemoryRegionSection *mem_section,
  27     MemoryRegion *root,
  28     hwaddr base,
  29     unsigned rows,
  30     unsigned src_width)
  31 {
  32     hwaddr src_len = (hwaddr)rows * src_width;
  33
  34     if (mem_section->mr) {
  35         memory_region_set_log(mem_section->mr, false, DIRTY_MEMORY_VGA);
  36         memory_region_unref(mem_section->mr);
  37         mem_section->mr = NULL;
  38     }
  39
  40     *mem_section = memory_region_find(root, base, src_len);
  41     if (!mem_section->mr) {
  42         return;
  43     }
  44
  45     if (int128_get64(mem_section->size) < src_len ||
  46             !memory_region_is_ram(mem_section->mr)) {
  47         memory_region_unref(mem_section->mr);
  48         mem_section->mr = NULL;
  49         return;
  50     }
  51
  52     memory_region_set_log(mem_section->mr, true, DIRTY_MEMORY_VGA);
  53 }
  54
  55 /* Render an image from a shared memory framebuffer.  */
  56 void framebuffer_update_display(
  57     DisplaySurface *ds,
  58     MemoryRegionSection *mem_section,
  59     int cols, /* Width in pixels.  */
  60     int rows, /* Height in pixels.  */
  61     int src_width, /* Length of source line, in bytes.  */
  62     int dest_row_pitch, /* Bytes between adjacent horizontal output pixels.  */
  63     int dest_col_pitch, /* Bytes between adjacent vertical output pixels.  */
  64     int invalidate, /* nonzero to redraw the whole image.  */
  65     drawfn fn,
  66     void *opaque,
  67     int *first_row, /* Input and output.  */
  68     int *last_row /* Output only */)
  69 {
  70     DirtyBitmapSnapshot *snap;
  71     uint8_t *dest;
  72     uint8_t *src;
  73     int first, last = 0;
  74     int dirty;
  75     int i;
  76     ram_addr_t addr;
  77     MemoryRegion *mem;
  78
  79     i = *first_row;
  80     *first_row = -1;
  81
  82     mem = mem_section->mr;
  83     if (!mem) {
  84         return;
  85     }
  86
  87     addr = mem_section->offset_within_region;
  88     src = memory_region_get_ram_ptr(mem) + addr;
  89
  90     dest = surface_data(ds);
  91     if (dest_col_pitch < 0) {
  92         dest -= dest_col_pitch * (cols - 1);
  93     }
  94     if (dest_row_pitch < 0) {
  95         dest -= dest_row_pitch * (rows - 1);
  96     }
  97     first = -1;
  98
  99     addr += i * src_width;
 100     src += i * src_width;
 101     dest += i * dest_row_pitch;
 102
 103     snap = memory_region_snapshot_and_clear_dirty(mem, addr, src_width * rows,
 104                                                   DIRTY_MEMORY_VGA);
 105     for (; i < rows; i++) {
 106         dirty = memory_region_snapshot_get_dirty(mem, snap, addr, src_width);
 107         if (dirty || invalidate) {
 108             fn(opaque, dest, src, cols, dest_col_pitch);
 109             if (first == -1)
 110                 first = i;
 111             last = i;
 112         }
 113         addr += src_width;
 114         src += src_width;
 115         dest += dest_row_pitch;
 116     }
 117     g_free(snap);
 118     if (first < 0) {
 119         return;
 120     }
 121     *first_row = first;
 122     *last_row = last;
 123 }