1 /*
2 * Copyright (C) 2007 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include "graphics.h"
18
19 #include <stdint.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23
24 #include <memory>
25
26 #include <android-base/properties.h>
27
28 #include "graphics_drm.h"
29 #include "graphics_fbdev.h"
30 #include "minui/minui.h"
31
32 static GRFont* gr_font = nullptr;
33 static MinuiBackend* gr_backend = nullptr;
34
35 static int overscan_offset_x = 0;
36 static int overscan_offset_y = 0;
37
38 static uint32_t gr_current = ~0;
39
40 // gr_draw is owned by backends.
41 static GRSurface* gr_draw = nullptr;
42 static GRRotation rotation = GRRotation::NONE;
43 static PixelFormat pixel_format = PixelFormat::UNKNOWN;
44 // The graphics backend list that provides fallback options for the default backend selection.
45 // For example, it will fist try DRM, then try FBDEV if DRM is unavailable.
46 constexpr auto default_backends = { GraphicsBackend::DRM, GraphicsBackend::FBDEV };
47
outside(int x,int y)48 static bool outside(int x, int y) {
49 auto swapped = (rotation == GRRotation::LEFT || rotation == GRRotation::RIGHT);
50 return x < 0 || x >= (swapped ? gr_draw->height : gr_draw->width) || y < 0 ||
51 y >= (swapped ? gr_draw->width : gr_draw->height);
52 }
53
gr_sys_font()54 const GRFont* gr_sys_font() {
55 return gr_font;
56 }
57
gr_pixel_format()58 PixelFormat gr_pixel_format() {
59 return pixel_format;
60 }
61
gr_measure(const GRFont * font,const char * s)62 int gr_measure(const GRFont* font, const char* s) {
63 if (font == nullptr) {
64 return -1;
65 }
66
67 return font->char_width * strlen(s);
68 }
69
gr_font_size(const GRFont * font,int * x,int * y)70 int gr_font_size(const GRFont* font, int* x, int* y) {
71 if (font == nullptr) {
72 return -1;
73 }
74
75 *x = font->char_width;
76 *y = font->char_height;
77 return 0;
78 }
79
80 // Blends gr_current onto pix value, assumes alpha as most significant byte.
pixel_blend_argb(uint8_t alpha,uint32_t pix)81 static inline uint32_t pixel_blend_argb(uint8_t alpha, uint32_t pix) {
82 if (alpha == 255) return gr_current;
83 if (alpha == 0) return pix;
84 uint32_t pix_r = pix & 0xff;
85 uint32_t pix_g = pix & 0xff00;
86 uint32_t pix_b = pix & 0xff0000;
87 uint32_t cur_r = gr_current & 0xff;
88 uint32_t cur_g = gr_current & 0xff00;
89 uint32_t cur_b = gr_current & 0xff0000;
90
91 uint32_t out_r = (pix_r * (255 - alpha) + cur_r * alpha) / 255;
92 uint32_t out_g = (pix_g * (255 - alpha) + cur_g * alpha) / 255;
93 uint32_t out_b = (pix_b * (255 - alpha) + cur_b * alpha) / 255;
94
95 return (out_r & 0xff) | (out_g & 0xff00) | (out_b & 0xff0000) | (gr_current & 0xff000000);
96 }
97
pixel_blend_rgba(uint8_t alpha,uint32_t pix)98 static inline uint32_t pixel_blend_rgba(uint8_t alpha, uint32_t pix) {
99 if (alpha == 255) return gr_current;
100 if (alpha == 0) return pix;
101 uint32_t pix_r = pix & 0xff00;
102 uint32_t pix_g = pix & 0xff0000;
103 uint32_t pix_b = pix & 0xff000000;
104 uint32_t cur_r = gr_current & 0xff00;
105 uint32_t cur_g = gr_current & 0xff0000;
106 uint32_t cur_b = gr_current & 0xff000000;
107
108 uint32_t out_r = (pix_r * (255 - alpha) + cur_r * alpha) / 255;
109 uint32_t out_g = (pix_g * (255 - alpha) + cur_g * alpha) / 255;
110 uint32_t out_b = (pix_b * (255 - alpha) + cur_b * alpha) / 255;
111
112 return (gr_current & 0xff) | (out_r & 0xff00) | (out_g & 0xff0000) | (out_b & 0xff000000);
113 }
114
pixel_blend(uint8_t alpha,uint32_t pix)115 static inline uint32_t pixel_blend(uint8_t alpha, uint32_t pix) {
116 if (pixel_format == PixelFormat::RGBA) {
117 return pixel_blend_rgba(alpha, pix);
118 }
119 return pixel_blend_argb(alpha, pix);
120 }
121
get_alphamask()122 static inline uint32_t get_alphamask() {
123 if (pixel_format == PixelFormat::RGBA) {
124 return 0x000000ff;
125 }
126 return 0xff000000;
127 }
128
get_alpha_shift()129 static inline uint8_t get_alpha_shift() {
130 if (pixel_format == PixelFormat::RGBA) {
131 return 0;
132 }
133 return 24;
134 }
135
get_alpha(uint32_t pix)136 static inline uint8_t get_alpha(uint32_t pix) {
137 return static_cast<uint8_t>((pix & (gr_current & get_alphamask())) >> get_alpha_shift());
138 }
139
140 // Increments pixel pointer right, with current rotation.
incr_x(uint32_t ** p,int row_pixels)141 static void incr_x(uint32_t** p, int row_pixels) {
142 if (rotation == GRRotation::LEFT) {
143 *p = *p - row_pixels;
144 } else if (rotation == GRRotation::RIGHT) {
145 *p = *p + row_pixels;
146 } else if (rotation == GRRotation::DOWN) {
147 *p = *p - 1;
148 } else { // GRRotation::NONE
149 *p = *p + 1;
150 }
151 }
152
153 // Increments pixel pointer down, with current rotation.
incr_y(uint32_t ** p,int row_pixels)154 static void incr_y(uint32_t** p, int row_pixels) {
155 if (rotation == GRRotation::LEFT) {
156 *p = *p + 1;
157 } else if (rotation == GRRotation::RIGHT) {
158 *p = *p - 1;
159 } else if (rotation == GRRotation::DOWN) {
160 *p = *p - row_pixels;
161 } else { // GRRotation::NONE
162 *p = *p + row_pixels;
163 }
164 }
165
166 // Returns pixel pointer at given coordinates with rotation adjustment.
PixelAt(GRSurface * surface,int x,int y,int row_pixels)167 static uint32_t* PixelAt(GRSurface* surface, int x, int y, int row_pixels) {
168 switch (rotation) {
169 case GRRotation::NONE:
170 return reinterpret_cast<uint32_t*>(surface->data()) + y * row_pixels + x;
171 case GRRotation::RIGHT:
172 return reinterpret_cast<uint32_t*>(surface->data()) + x * row_pixels + (surface->width - y);
173 case GRRotation::DOWN:
174 return reinterpret_cast<uint32_t*>(surface->data()) + (surface->height - 1 - y) * row_pixels +
175 (surface->width - 1 - x);
176 case GRRotation::LEFT:
177 return reinterpret_cast<uint32_t*>(surface->data()) + (surface->height - 1 - x) * row_pixels +
178 y;
179 default:
180 printf("invalid rotation %d", static_cast<int>(rotation));
181 }
182 return nullptr;
183 }
184
TextBlend(const uint8_t * src_p,int src_row_bytes,uint32_t * dst_p,int dst_row_pixels,int width,int height)185 static void TextBlend(const uint8_t* src_p, int src_row_bytes, uint32_t* dst_p, int dst_row_pixels,
186 int width, int height) {
187 uint8_t alpha_current = get_alpha(gr_current);
188 for (int j = 0; j < height; ++j) {
189 const uint8_t* sx = src_p;
190 uint32_t* px = dst_p;
191 for (int i = 0; i < width; ++i, incr_x(&px, dst_row_pixels)) {
192 uint8_t a = *sx++;
193 if (alpha_current < 255) a = (static_cast<uint32_t>(a) * alpha_current) / 255;
194 *px = pixel_blend(a, *px);
195 }
196 src_p += src_row_bytes;
197 incr_y(&dst_p, dst_row_pixels);
198 }
199 }
200
gr_text(const GRFont * font,int x,int y,const char * s,bool bold)201 void gr_text(const GRFont* font, int x, int y, const char* s, bool bold) {
202 if (!font || !font->texture || (gr_current & get_alphamask()) == 0) return;
203
204 if (font->texture->pixel_bytes != 1) {
205 printf("gr_text: font has wrong format\n");
206 return;
207 }
208
209 bold = bold && (font->texture->height != font->char_height);
210
211 x += overscan_offset_x;
212 y += overscan_offset_y;
213
214 unsigned char ch;
215 while ((ch = *s++)) {
216 if (outside(x, y) || outside(x + font->char_width - 1, y + font->char_height - 1)) break;
217
218 if (ch < ' ' || ch > '~') {
219 ch = '?';
220 }
221
222 int row_pixels = gr_draw->row_bytes / gr_draw->pixel_bytes;
223 const uint8_t* src_p = font->texture->data() + ((ch - ' ') * font->char_width) +
224 (bold ? font->char_height * font->texture->row_bytes : 0);
225 uint32_t* dst_p = PixelAt(gr_draw, x, y, row_pixels);
226
227 TextBlend(src_p, font->texture->row_bytes, dst_p, row_pixels, font->char_width,
228 font->char_height);
229
230 x += font->char_width;
231 }
232 }
233
gr_texticon(int x,int y,const GRSurface * icon)234 void gr_texticon(int x, int y, const GRSurface* icon) {
235 if (icon == nullptr) return;
236
237 if (icon->pixel_bytes != 1) {
238 printf("gr_texticon: source has wrong format\n");
239 return;
240 }
241
242 x += overscan_offset_x;
243 y += overscan_offset_y;
244
245 if (outside(x, y) || outside(x + icon->width - 1, y + icon->height - 1)) return;
246
247 int row_pixels = gr_draw->row_bytes / gr_draw->pixel_bytes;
248 const uint8_t* src_p = icon->data();
249 uint32_t* dst_p = PixelAt(gr_draw, x, y, row_pixels);
250 TextBlend(src_p, icon->row_bytes, dst_p, row_pixels, icon->width, icon->height);
251 }
252
gr_color(unsigned char r,unsigned char g,unsigned char b,unsigned char a)253 void gr_color(unsigned char r, unsigned char g, unsigned char b, unsigned char a) {
254 uint32_t r32 = r, g32 = g, b32 = b, a32 = a;
255 if (pixel_format == PixelFormat::ARGB || pixel_format == PixelFormat::BGRA) {
256 gr_current = (a32 << 24) | (r32 << 16) | (g32 << 8) | b32;
257 } else if (pixel_format == PixelFormat::RGBA) {
258 gr_current = (b32 << 24) | (g32 << 16) | (r32 << 8) | a32;
259 } else {
260 gr_current = (a32 << 24) | (b32 << 16) | (g32 << 8) | r32;
261 }
262 }
263
gr_clear()264 void gr_clear() {
265 if ((gr_current & 0xff) == ((gr_current >> 8) & 0xff) &&
266 (gr_current & 0xff) == ((gr_current >> 16) & 0xff) &&
267 (gr_current & 0xff) == ((gr_current >> 24) & 0xff) &&
268 gr_draw->row_bytes == gr_draw->width * gr_draw->pixel_bytes) {
269 memset(gr_draw->data(), gr_current & 0xff, gr_draw->height * gr_draw->row_bytes);
270 } else {
271 uint32_t* px = reinterpret_cast<uint32_t*>(gr_draw->data());
272 int row_diff = gr_draw->row_bytes / gr_draw->pixel_bytes - gr_draw->width;
273 for (int y = 0; y < gr_draw->height; ++y) {
274 for (int x = 0; x < gr_draw->width; ++x) {
275 *px++ = gr_current;
276 }
277 px += row_diff;
278 }
279 }
280 }
281
gr_fill(int x1,int y1,int x2,int y2)282 void gr_fill(int x1, int y1, int x2, int y2) {
283 x1 += overscan_offset_x;
284 y1 += overscan_offset_y;
285
286 x2 += overscan_offset_x;
287 y2 += overscan_offset_y;
288
289 if (outside(x1, y1) || outside(x2 - 1, y2 - 1)) return;
290
291 int row_pixels = gr_draw->row_bytes / gr_draw->pixel_bytes;
292 uint32_t* p = PixelAt(gr_draw, x1, y1, row_pixels);
293 uint8_t alpha = get_alpha(gr_current);
294 if (alpha > 0) {
295 for (int y = y1; y < y2; ++y) {
296 uint32_t* px = p;
297 for (int x = x1; x < x2; ++x) {
298 *px = pixel_blend(alpha, *px);
299 incr_x(&px, row_pixels);
300 }
301 incr_y(&p, row_pixels);
302 }
303 }
304 }
305
gr_blit(const GRSurface * source,int sx,int sy,int w,int h,int dx,int dy)306 void gr_blit(const GRSurface* source, int sx, int sy, int w, int h, int dx, int dy) {
307 if (source == nullptr) return;
308
309 if (gr_draw->pixel_bytes != source->pixel_bytes) {
310 printf("gr_blit: source has wrong format\n");
311 return;
312 }
313
314 dx += overscan_offset_x;
315 dy += overscan_offset_y;
316
317 if (outside(dx, dy) || outside(dx + w - 1, dy + h - 1)) return;
318
319 if (rotation != GRRotation::NONE) {
320 int src_row_pixels = source->row_bytes / source->pixel_bytes;
321 int row_pixels = gr_draw->row_bytes / gr_draw->pixel_bytes;
322 const uint32_t* src_py =
323 reinterpret_cast<const uint32_t*>(source->data()) + sy * source->row_bytes / 4 + sx;
324 uint32_t* dst_py = PixelAt(gr_draw, dx, dy, row_pixels);
325
326 for (int y = 0; y < h; y += 1) {
327 const uint32_t* src_px = src_py;
328 uint32_t* dst_px = dst_py;
329 for (int x = 0; x < w; x += 1) {
330 *dst_px = *src_px++;
331 incr_x(&dst_px, row_pixels);
332 }
333 src_py += src_row_pixels;
334 incr_y(&dst_py, row_pixels);
335 }
336 } else {
337 const uint8_t* src_p = source->data() + sy * source->row_bytes + sx * source->pixel_bytes;
338 uint8_t* dst_p = gr_draw->data() + dy * gr_draw->row_bytes + dx * gr_draw->pixel_bytes;
339
340 for (int i = 0; i < h; ++i) {
341 memcpy(dst_p, src_p, w * source->pixel_bytes);
342 src_p += source->row_bytes;
343 dst_p += gr_draw->row_bytes;
344 }
345 }
346 }
347
gr_get_width(const GRSurface * surface)348 unsigned int gr_get_width(const GRSurface* surface) {
349 if (surface == nullptr) {
350 return 0;
351 }
352 return surface->width;
353 }
354
gr_get_height(const GRSurface * surface)355 unsigned int gr_get_height(const GRSurface* surface) {
356 if (surface == nullptr) {
357 return 0;
358 }
359 return surface->height;
360 }
361
gr_init_font(const char * name,GRFont ** dest)362 int gr_init_font(const char* name, GRFont** dest) {
363 GRFont* font = static_cast<GRFont*>(calloc(1, sizeof(*gr_font)));
364 if (font == nullptr) {
365 return -1;
366 }
367
368 int res = res_create_alpha_surface(name, &(font->texture));
369 if (res < 0) {
370 free(font);
371 return res;
372 }
373
374 // The font image should be a 96x2 array of character images. The
375 // columns are the printable ASCII characters 0x20 - 0x7f. The
376 // top row is regular text; the bottom row is bold.
377 font->char_width = font->texture->width / 96;
378 font->char_height = font->texture->height / 2;
379
380 *dest = font;
381
382 return 0;
383 }
384
gr_flip()385 void gr_flip() {
386 gr_draw = gr_backend->Flip();
387 }
388
create_backend(GraphicsBackend backend)389 std::unique_ptr<MinuiBackend> create_backend(GraphicsBackend backend) {
390 switch (backend) {
391 case GraphicsBackend::DRM:
392 return std::make_unique<MinuiBackendDrm>();
393 case GraphicsBackend::FBDEV:
394 return std::make_unique<MinuiBackendFbdev>();
395 default:
396 return nullptr;
397 }
398 }
399
gr_init()400 int gr_init() {
401 return gr_init(default_backends);
402 }
403
gr_init(std::initializer_list<GraphicsBackend> backends)404 int gr_init(std::initializer_list<GraphicsBackend> backends) {
405 // pixel_format needs to be set before loading any resources or initializing backends.
406 std::string format = android::base::GetProperty("ro.minui.pixel_format", "");
407 if (format == "ABGR_8888") {
408 pixel_format = PixelFormat::ABGR;
409 } else if (format == "RGBX_8888") {
410 pixel_format = PixelFormat::RGBX;
411 } else if (format == "ARGB_8888") {
412 pixel_format = PixelFormat::ARGB;
413 } else if (format == "BGRA_8888") {
414 pixel_format = PixelFormat::BGRA;
415 } else if (format == "RGBA_8888") {
416 pixel_format = PixelFormat::RGBA;
417 } else {
418 pixel_format = PixelFormat::UNKNOWN;
419 }
420
421 int ret = gr_init_font("font", &gr_font);
422 if (ret != 0) {
423 printf("Failed to init font: %d, continuing graphic backend initialization without font file\n",
424 ret);
425 }
426
427 std::unique_ptr<MinuiBackend> minui_backend;
428 for (GraphicsBackend backend : backends) {
429 minui_backend = create_backend(backend);
430 if (!minui_backend) {
431 printf("gr_init: minui_backend %d is a nullptr\n", backend);
432 continue;
433 }
434 gr_draw = minui_backend->Init();
435 if (gr_draw) break;
436 }
437
438 if (!gr_draw) {
439 return -1;
440 }
441
442 gr_backend = minui_backend.release();
443
444 int overscan_percent = android::base::GetIntProperty("ro.minui.overscan_percent", 0);
445 overscan_offset_x = gr_draw->width * overscan_percent / 100;
446 overscan_offset_y = gr_draw->height * overscan_percent / 100;
447
448 gr_flip();
449 gr_flip();
450 if (!gr_draw) {
451 printf("gr_init: gr_draw becomes nullptr after gr_flip\n");
452 return -1;
453 }
454
455 std::string rotation_str =
456 android::base::GetProperty("ro.minui.default_rotation", "ROTATION_NONE");
457 if (rotation_str == "ROTATION_RIGHT") {
458 gr_rotate(GRRotation::RIGHT);
459 } else if (rotation_str == "ROTATION_DOWN") {
460 gr_rotate(GRRotation::DOWN);
461 } else if (rotation_str == "ROTATION_LEFT") {
462 gr_rotate(GRRotation::LEFT);
463 } else { // "ROTATION_NONE" or unknown string
464 gr_rotate(GRRotation::NONE);
465 }
466
467 if (gr_draw->pixel_bytes != 4) {
468 printf("gr_init: Only 4-byte pixel formats supported\n");
469 }
470
471 return 0;
472 }
473
gr_exit()474 void gr_exit() {
475 delete gr_backend;
476 gr_backend = nullptr;
477
478 delete gr_font;
479 gr_font = nullptr;
480 }
481
gr_fb_width()482 int gr_fb_width() {
483 return (rotation == GRRotation::LEFT || rotation == GRRotation::RIGHT)
484 ? gr_draw->height - 2 * overscan_offset_y
485 : gr_draw->width - 2 * overscan_offset_x;
486 }
487
gr_fb_height()488 int gr_fb_height() {
489 return (rotation == GRRotation::LEFT || rotation == GRRotation::RIGHT)
490 ? gr_draw->width - 2 * overscan_offset_x
491 : gr_draw->height - 2 * overscan_offset_y;
492 }
493
gr_fb_blank(bool blank)494 void gr_fb_blank(bool blank) {
495 gr_backend->Blank(blank);
496 }
497
gr_fb_blank(bool blank,int index)498 void gr_fb_blank(bool blank, int index) {
499 gr_backend->Blank(blank, static_cast<MinuiBackend::DrmConnector>(index));
500 }
501
gr_rotate(GRRotation rot)502 void gr_rotate(GRRotation rot) {
503 rotation = rot;
504 }
505
gr_has_multiple_connectors()506 bool gr_has_multiple_connectors() {
507 return gr_backend->HasMultipleConnectors();
508 }
509