summaryrefslogtreecommitdiffstats
path: root/src/boot/efi/splash.c
blob: ba4a2c5da0a808f504040184368d674752851021 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
/* SPDX-License-Identifier: LGPL-2.1+ */

#include <efi.h>
#include <efilib.h>

#include "graphics.h"
#include "splash.h"
#include "util.h"

struct bmp_file {
        CHAR8 signature[2];
        UINT32 size;
        UINT16 reserved[2];
        UINT32 offset;
} __attribute__((packed));

/* we require at least BITMAPINFOHEADER, later versions are
   accepted, but their features ignored */
struct bmp_dib {
        UINT32 size;
        UINT32 x;
        UINT32 y;
        UINT16 planes;
        UINT16 depth;
        UINT32 compression;
        UINT32 image_size;
        INT32 x_pixel_meter;
        INT32 y_pixel_meter;
        UINT32 colors_used;
        UINT32 colors_important;
} __attribute__((packed));

struct bmp_map {
        UINT8 blue;
        UINT8 green;
        UINT8 red;
        UINT8 reserved;
} __attribute__((packed));

EFI_STATUS bmp_parse_header(UINT8 *bmp, UINTN size, struct bmp_dib **ret_dib,
                            struct bmp_map **ret_map, UINT8 **pixmap) {
        struct bmp_file *file;
        struct bmp_dib *dib;
        struct bmp_map *map;
        UINTN row_size;

        if (size < sizeof(struct bmp_file) + sizeof(struct bmp_dib))
                return EFI_INVALID_PARAMETER;

        /* check file header */
        file = (struct bmp_file *)bmp;
        if (file->signature[0] != 'B' || file->signature[1] != 'M')
                return EFI_INVALID_PARAMETER;
        if (file->size != size)
                return EFI_INVALID_PARAMETER;
        if (file->size < file->offset)
                return EFI_INVALID_PARAMETER;

        /*  check device-independent bitmap */
        dib = (struct bmp_dib *)(bmp + sizeof(struct bmp_file));
        if (dib->size < sizeof(struct bmp_dib))
                return EFI_UNSUPPORTED;

        switch (dib->depth) {
        case 1:
        case 4:
        case 8:
        case 24:
                if (dib->compression != 0)
                        return EFI_UNSUPPORTED;

                break;

        case 16:
        case 32:
                if (dib->compression != 0 && dib->compression != 3)
                        return EFI_UNSUPPORTED;

                break;

        default:
                return EFI_UNSUPPORTED;
        }

        row_size = ((UINTN) dib->depth * dib->x + 31) / 32 * 4;
        if (file->size - file->offset <  dib->y * row_size)
                return EFI_INVALID_PARAMETER;
        if (row_size * dib->y > 64 * 1024 * 1024)
                return EFI_INVALID_PARAMETER;

        /* check color table */
        map = (struct bmp_map *)(bmp + sizeof(struct bmp_file) + dib->size);
        if (file->offset < sizeof(struct bmp_file) + dib->size)
                return EFI_INVALID_PARAMETER;

        if (file->offset > sizeof(struct bmp_file) + dib->size) {
                UINT32 map_count;
                UINTN map_size;

                if (dib->colors_used)
                        map_count = dib->colors_used;
                else {
                        switch (dib->depth) {
                        case 1:
                        case 4:
                        case 8:
                                map_count = 1 << dib->depth;
                                break;

                        default:
                                map_count = 0;
                                break;
                        }
                }

                map_size = file->offset - (sizeof(struct bmp_file) + dib->size);
                if (map_size != sizeof(struct bmp_map) * map_count)
                        return EFI_INVALID_PARAMETER;
        }

        *ret_map = map;
        *ret_dib = dib;
        *pixmap = bmp + file->offset;

        return EFI_SUCCESS;
}

static VOID pixel_blend(UINT32 *dst, const UINT32 source) {
        UINT32 alpha, src, src_rb, src_g, dst_rb, dst_g, rb, g;

        alpha = (source & 0xff);

        /* convert src from RGBA to XRGB */
        src = source >> 8;

        /* decompose into RB and G components */
        src_rb = (src & 0xff00ff);
        src_g  = (src & 0x00ff00);

        dst_rb = (*dst & 0xff00ff);
        dst_g  = (*dst & 0x00ff00);

        /* blend */
        rb = ((((src_rb - dst_rb) * alpha + 0x800080) >> 8) + dst_rb) & 0xff00ff;
        g  = ((((src_g  -  dst_g) * alpha + 0x008000) >> 8) +  dst_g) & 0x00ff00;

        *dst = (rb | g);
}

EFI_STATUS bmp_to_blt(EFI_GRAPHICS_OUTPUT_BLT_PIXEL *buf,
                      struct bmp_dib *dib, struct bmp_map *map,
                      UINT8 *pixmap) {
        UINT8 *in;
        UINTN y;

        /* transform and copy pixels */
        in = pixmap;
        for (y = 0; y < dib->y; y++) {
                EFI_GRAPHICS_OUTPUT_BLT_PIXEL *out;
                UINTN row_size;
                UINTN x;

                out = &buf[(dib->y - y - 1) * dib->x];
                for (x = 0; x < dib->x; x++, in++, out++) {
                        switch (dib->depth) {
                        case 1: {
                                UINTN i;

                                for (i = 0; i < 8 && x < dib->x; i++) {
                                        out->Red = map[((*in) >> (7 - i)) & 1].red;
                                        out->Green = map[((*in) >> (7 - i)) & 1].green;
                                        out->Blue = map[((*in) >> (7 - i)) & 1].blue;
                                        out++;
                                        x++;
                                }
                                out--;
                                x--;
                                break;
                        }

                        case 4: {
                                UINTN i;

                                i = (*in) >> 4;
                                out->Red = map[i].red;
                                out->Green = map[i].green;
                                out->Blue = map[i].blue;
                                if (x < (dib->x - 1)) {
                                        out++;
                                        x++;
                                        i = (*in) & 0x0f;
                                        out->Red = map[i].red;
                                        out->Green = map[i].green;
                                        out->Blue = map[i].blue;
                                }
                                break;
                        }

                        case 8:
                                out->Red = map[*in].red;
                                out->Green = map[*in].green;
                                out->Blue = map[*in].blue;
                                break;

                        case 16: {
                                UINT16 i = *(UINT16 *) in;

                                out->Red = (i & 0x7c00) >> 7;
                                out->Green = (i & 0x3e0) >> 2;
                                out->Blue = (i & 0x1f) << 3;
                                in += 1;
                                break;
                        }

                        case 24:
                                out->Red = in[2];
                                out->Green = in[1];
                                out->Blue = in[0];
                                in += 2;
                                break;

                        case 32: {
                                UINT32 i = *(UINT32 *) in;

                                pixel_blend((UINT32 *)out, i);

                                in += 3;
                                break;
                        }
                        }
                }

                /* add row padding; new lines always start at 32 bit boundary */
                row_size = in - pixmap;
                in += ((row_size + 3) & ~3) - row_size;
        }

        return EFI_SUCCESS;
}

EFI_STATUS graphics_splash(UINT8 *content, UINTN len, const EFI_GRAPHICS_OUTPUT_BLT_PIXEL *background) {
        EFI_GRAPHICS_OUTPUT_BLT_PIXEL pixel = {};
        EFI_GUID GraphicsOutputProtocolGuid = EFI_GRAPHICS_OUTPUT_PROTOCOL_GUID;
        EFI_GRAPHICS_OUTPUT_PROTOCOL *GraphicsOutput = NULL;
        struct bmp_dib *dib;
        struct bmp_map *map;
        UINT8 *pixmap;
        UINT64 blt_size;
        _cleanup_freepool_ VOID *blt = NULL;
        UINTN x_pos = 0;
        UINTN y_pos = 0;
        EFI_STATUS err;

        if (!background) {
                if (StriCmp(L"Apple", ST->FirmwareVendor) == 0) {
                        pixel.Red = 0xc0;
                        pixel.Green = 0xc0;
                        pixel.Blue = 0xc0;
                }
                background = &pixel;
        }

        err = LibLocateProtocol(&GraphicsOutputProtocolGuid, (VOID **)&GraphicsOutput);
        if (EFI_ERROR(err))
                return err;

        err = bmp_parse_header(content, len, &dib, &map, &pixmap);
        if (EFI_ERROR(err))
                return err;

        if (dib->x < GraphicsOutput->Mode->Info->HorizontalResolution)
                x_pos = (GraphicsOutput->Mode->Info->HorizontalResolution - dib->x) / 2;
        if (dib->y < GraphicsOutput->Mode->Info->VerticalResolution)
                y_pos = (GraphicsOutput->Mode->Info->VerticalResolution - dib->y) / 2;

        uefi_call_wrapper(GraphicsOutput->Blt, 10, GraphicsOutput,
                          (EFI_GRAPHICS_OUTPUT_BLT_PIXEL *)background,
                          EfiBltVideoFill, 0, 0, 0, 0,
                          GraphicsOutput->Mode->Info->HorizontalResolution,
                          GraphicsOutput->Mode->Info->VerticalResolution, 0);

        /* EFI buffer */
        blt_size = sizeof(EFI_GRAPHICS_OUTPUT_BLT_PIXEL) * dib->x * dib->y;
        blt = AllocatePool(blt_size);
        if (!blt)
                return EFI_OUT_OF_RESOURCES;

        err = uefi_call_wrapper(GraphicsOutput->Blt, 10, GraphicsOutput,
                                blt, EfiBltVideoToBltBuffer, x_pos, y_pos, 0, 0,
                                dib->x, dib->y, 0);
        if (EFI_ERROR(err))
                return err;

        err = bmp_to_blt(blt, dib, map, pixmap);
        if (EFI_ERROR(err))
                return err;

        err = graphics_mode(TRUE);
        if (EFI_ERROR(err))
                return err;

        return uefi_call_wrapper(GraphicsOutput->Blt, 10, GraphicsOutput,
                                 blt, EfiBltBufferToVideo, 0, 0, x_pos, y_pos,
                                 dib->x, dib->y, 0);
}