LXR qemu/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
  25void 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.  */
  56void 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}
 124