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 "ui/console.h"
  22 #include "framebuffer.h"
  23
  24 void framebuffer_update_memory_section(
  25     MemoryRegionSection *mem_section,
  26     MemoryRegion *root,
  27     hwaddr base,
  28     unsigned rows,
  29     unsigned src_width)
  30 {
  31     hwaddr src_len = (hwaddr)rows * src_width;
  32
  33     if (mem_section->mr) {
  34         memory_region_set_log(mem_section->mr, false, DIRTY_MEMORY_VGA);
  35         memory_region_unref(mem_section->mr);
  36         mem_section->mr = NULL;
  37     }
  38
  39     *mem_section = memory_region_find(root, base, src_len);
  40     if (!mem_section->mr) {
  41         return;
  42     }
  43
  44     if (int128_get64(mem_section->size) < src_len ||
  45             !memory_region_is_ram(mem_section->mr)) {
  46         memory_region_unref(mem_section->mr);
  47         mem_section->mr = NULL;
  48         return;
  49     }
  50
  51     memory_region_set_log(mem_section->mr, true, DIRTY_MEMORY_VGA);
  52 }
  53
  54 /* Render an image from a shared memory framebuffer.  */
  55 void framebuffer_update_display(
  56     DisplaySurface *ds,
  57     MemoryRegionSection *mem_section,
  58     int cols, /* Width in pixels.  */
  59     int rows, /* Height in pixels.  */
  60     int src_width, /* Length of source line, in bytes.  */
  61     int dest_row_pitch, /* Bytes between adjacent horizontal output pixels.  */
  62     int dest_col_pitch, /* Bytes between adjacent vertical output pixels.  */
  63     int invalidate, /* nonzero to redraw the whole image.  */
  64     drawfn fn,
  65     void *opaque,
  66     int *first_row, /* Input and output.  */
  67     int *last_row /* Output only */)
  68 {
  69     DirtyBitmapSnapshot *snap;
  70     uint8_t *dest;
  71     uint8_t *src;
  72     int first, last = 0;
  73     int dirty;
  74     int i;
  75     ram_addr_t addr;
  76     MemoryRegion *mem;
  77
  78     i = *first_row;
  79     *first_row = -1;
  80
  81     mem = mem_section->mr;
  82     if (!mem) {
  83         return;
  84     }
  85
  86     addr = mem_section->offset_within_region;
  87     src = memory_region_get_ram_ptr(mem) + addr;
  88
  89     dest = surface_data(ds);
  90     if (dest_col_pitch < 0) {
  91         dest -= dest_col_pitch * (cols - 1);
  92     }
  93     if (dest_row_pitch < 0) {
  94         dest -= dest_row_pitch * (rows - 1);
  95     }
  96     first = -1;
  97
  98     addr += i * src_width;
  99     src += i * src_width;
 100     dest += i * dest_row_pitch;
 101
 102     snap = memory_region_snapshot_and_clear_dirty(mem, addr, src_width * rows,
 103                                                   DIRTY_MEMORY_VGA);
 104     for (; i < rows; i++) {
 105         dirty = memory_region_snapshot_get_dirty(mem, snap, addr, src_width);
 106         if (dirty || invalidate) {
 107             fn(opaque, dest, src, cols, dest_col_pitch);
 108             if (first == -1)
 109                 first = i;
 110             last = i;
 111         }
 112         addr += src_width;
 113         src += src_width;
 114         dest += dest_row_pitch;
 115     }
 116     g_free(snap);
 117     if (first < 0) {
 118         return;
 119     }
 120     *first_row = first;
 121     *last_row = last;
 122 }