Android5.0 Recovery源代碼分析與定制---recovery UI相關(guān)(二)
[導(dǎo)讀]點(diǎn)擊上方嵌入式開(kāi)發(fā)圈 記得關(guān)注我們哦！ ??在上一篇文章中，我們大致的介紹了recovery的啟動(dòng)流程，那么，recovery升級(jí)或者做雙清的時(shí)候，那些圖形動(dòng)畫又是如何實(shí)現(xiàn)的呢？我們來(lái)看看代碼。 ?? ? 以下這段代碼位于recovery/screen_ui.cpp 1void?ScreenRecoveryU
在上一篇文章中，我們大致的介紹了recovery的啟動(dòng)流程，那么，recovery升級(jí)或者做雙清的時(shí)候，那些圖形動(dòng)畫又是如何實(shí)現(xiàn)的呢？我們來(lái)看看代碼。
以下這段代碼位于recovery/screen_ui.cpp
1void ScreenRecoveryUI::Init()
2{
3 gr_init();
4
5 gr_font_size(&char_width, &char_height);
6
7 text_col = text_row = 0;
8 text_rows = gr_fb_height() / char_height;
9 if (text_rows > kMaxRows) text_rows = kMaxRows;
10 text_top = 1;
11
12 text_cols = gr_fb_width() / char_width;
13 if (text_cols > kMaxCols - 1) text_cols = kMaxCols - 1;
14
15 backgroundIcon[NONE] = NULL;
16 LoadBitmapArray("icon_installing", &installing_frames, &installation);
17 backgroundIcon[INSTALLING_UPDATE] = installing_frames ? installation[0] : NULL;
18 backgroundIcon[ERASING] = backgroundIcon[INSTALLING_UPDATE];
19 LoadBitmap("icon_error", &backgroundIcon[ERROR]);
20 backgroundIcon[NO_COMMAND] = backgroundIcon[ERROR];
21
22 LoadBitmap("progress_empty", &progressBarEmpty);
23 LoadBitmap("progress_fill", &progressBarFill);
24 LoadBitmap("stage_empty", &stageMarkerEmpty);
25 LoadBitmap("stage_fill", &stageMarkerFill);
26
27 LoadLocalizedBitmap("installing_text", &backgroundText[INSTALLING_UPDATE]);
28 LoadLocalizedBitmap("erasing_text", &backgroundText[ERASING]);
29 LoadLocalizedBitmap("no_command_text", &backgroundText[NO_COMMAND]);
30 LoadLocalizedBitmap("error_text", &backgroundText[ERROR]);
31
32 pthread_create(&progress_t, NULL, progress_thread, NULL);
33
34 RecoveryUI::Init();
35}
這段代碼都做了哪些事情呢？這些recovery初始化圖形顯示最開(kāi)始的部分:(1)調(diào)用了miniui中的gr_init初始化顯示圖形相關(guān)的步驟，因?yàn)閞ecovery是基于framebuffer機(jī)制顯示的。
(2)調(diào)用gr_font_size設(shè)置字體顯示的大小，然后計(jì)算文本顯示行列。
(3)接下來(lái)就是裝載圖片了，會(huì)調(diào)用到LoadBitmapArray和LoadBitmap這兩個(gè)函數(shù)。其中，我們會(huì)看到這些函數(shù)里圖片的名稱:
將上面的字符串與下面的圖片一一對(duì)應(yīng)：
那么這些分別是怎么顯示的？其中erasing_text是用來(lái)顯示做清除的時(shí)候顯示的文字,放大后如下：
這上面有許許多多的語(yǔ)言版本，我們可以根據(jù)需要來(lái)選擇，這些主要要看接下來(lái)初始化文字的代碼邏輯。
其余的圖片中，后綴帶text的，也和這些是類似的，有出現(xiàn)錯(cuò)誤顯示的字體error_text，更新系統(tǒng)顯示的字體installing_text，沒(méi)有命令的時(shí)候顯示的字體no_command_text。
除了文字顯示，我們最關(guān)心的就是icon_installing這張圖片了，在做系統(tǒng)更新的時(shí)候，這個(gè)機(jī)器人會(huì)轉(zhuǎn)動(dòng)。這不是動(dòng)畫嗎？怎么只有一張圖片呢？我們找到Android官方網(wǎng)站看看是為什么？原因如下：
1# Copyright (C) 2014 The Android Open Source Project
2#
3# Licensed under the Apache License, Version 2.0 (the "License");
4# you may not use this file except in compliance with the License.
5# You may obtain a copy of the License at
6#
7# http://www.apache.org/licenses/LICENSE-2.0
8#
9# Unless required by applicable law or agreed to in writing, software
10# distributed under the License is distributed on an "AS IS" BASIS,
11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12# See the License for the specific language governing permissions and
13# limitations under the License.
14"""Script to take a set of frames (PNG files) for a recovery animation
15and turn it into a single output image which contains the input frames
16interlaced by row. Run with the names of all the input frames on the
17command line, in order, followed by the name of the output file."""
18import sys
19try:
20 import Image
21 import PngImagePlugin
22except ImportError:
23 print "This script requires the Python Imaging Library to be installed."
24 sys.exit(1)
25frames = [Image.open(fn).convert("RGB") for fn in sys.argv[1:-1]]
26assert len(frames) > 0, "Must have at least one input frame."
27sizes = set()
28for fr in frames:
29 sizes.add(fr.size)
30assert len(sizes) == 1, "All input images must have the same size."
31w, h = sizes.pop()
32N = len(frames)
33out = Image.new("RGB", (w, h*N))
34for j in range(h):
35 for i in range(w):
36 for fn, f in enumerate(frames):
37 out.putpixel((i, j*N+fn), f.getpixel((i, j)))
38# When loading this image, the graphics library expects to find a text
39# chunk that specifies how many frames this animation represents. If
40# you post-process the output of this script with some kind of
41# optimizer tool (eg pngcrush or zopflipng) make sure that your
42# optimizer preserves this text chunk.
43meta = PngImagePlugin.PngInfo()
44meta.add_text("Frames", str(N))
45out.save(sys.argv[-1], pnginfo=meta)
這也就是為什么，調(diào)用這張圖片需要用到LoadBitmapArray這個(gè)函數(shù)的原因。
1void ScreenRecoveryUI::LoadBitmapArray(const char* filename, int* frames, gr_surface** surface) {
2 int result = res_create_multi_display_surface(filename, frames, surface);
3 if (result < 0) {
4 LOGE("missing bitmap %s\n(Code %d)\n", filename, result);
5 }
6}
調(diào)完這個(gè)函數(shù)后會(huì)調(diào)用
resources.cpp中的res_create_multi_display_surface函數(shù)用于顯示，源碼如下：
1int res_create_multi_display_surface(const char* name, int* frames, GRSurface*** pSurface) {
2 GRSurface** surface = NULL;
3 int result = 0;
4 png_structp png_ptr = NULL;
5 png_infop info_ptr = NULL;
6 png_uint_32 width, height;
7 png_byte channels;
8 int i;
9 png_textp text;
10 int num_text;
11 unsigned char* p_row;
12 unsigned int y;
13
14 *pSurface = NULL;
15 *frames = -1;
16
17 result = open_png(name, &png_ptr, &info_ptr, &width, &height, &channels);
18 if (result < 0) return result;
19
20 *frames = 1;
21 if (png_get_text(png_ptr, info_ptr, &text, &num_text)) {
22 for (i = 0; i < num_text; ++i) {
23 if (text[i].key && strcmp(text[i].key, "Frames") == 0 && text[i].text) {
24 *frames = atoi(text[i].text);
25 break;
26 }
27 }
28 printf(" found frames = %d\n", *frames);
}
30
31 if (height % *frames != 0) {
32 printf("bad height (%d) for frame count (%d)\n", height, *frames);
33 result = -9;
34 goto exit;
35 }
36
37 surface = reinterpret_cast<GRSurface**>(malloc(*frames * sizeof(GRSurface*)));
38 if (surface == NULL) {
39 result = -8;
40 goto exit;
41 }
42 for (i = 0; i < *frames; ++i) {
43 surface[i] = init_display_surface(width, height / *frames);
44 if (surface[i] == NULL) {
45 result = -8;
46 goto exit;
47 }
48 }
49
50#if defined(RECOVERY_ABGR) || defined(RECOVERY_BGRA)
51 png_set_bgr(png_ptr);
52#endif
53
54 p_row = reinterpret_cast<unsigned char*>(malloc(width * 4));
55 for (y = 0; y < height; ++y) {
56 png_read_row(png_ptr, p_row, NULL);
57 int frame = y % *frames;
58 unsigned char* out_row = surface[frame]->data +
59 (y / *frames) * surface[frame]->row_bytes;
60 transform_rgb_to_draw(p_row, out_row, channels, width);
61 }
62 free(p_row);
63
64 *pSurface = reinterpret_cast<GRSurface**>(surface);
65
66exit:
67 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
68
69 if (result < 0) {
70 if (surface) {
71 for (i = 0; i < *frames; ++i) {
72 if (surface[i]) free(surface[i]);
73 }
74 free(surface);
75 }
76 }
77 return result;
78}
其余的和text無(wú)關(guān)圖片，會(huì)用到LoadBitmap這個(gè)函數(shù):
1void ScreenRecoveryUI::LoadBitmapArray(const char* filename, int* frames, gr_surface** surface) {
2 int result = res_create_multi_display_surface(filename, frames, surface);
3 if (result < 0) {
4 LOGE("missing bitmap %s\n(Code %d)\n", filename, result);
5 }
6}
同樣調(diào)用到以下函數(shù):
1int res_create_multi_display_surface(const char* name, int* frames, GRSurface*** pSurface) {
2 GRSurface** surface = NULL;
3 int result = 0;
4 png_structp png_ptr = NULL;
5 png_infop info_ptr = NULL;
6 png_uint_32 width, height;
7 png_byte channels;
8 int i;
9 png_textp text;
10 int num_text;
11 unsigned char* p_row;
12 unsigned int y;
13
14 *pSurface = NULL;
15 *frames = -1;
16
17 result = open_png(name, &png_ptr, &info_ptr, &width, &height, &channels);
18 if (result < 0) return result;
19
20 *frames = 1;
21 if (png_get_text(png_ptr, info_ptr, &text, &num_text)) {
22 for (i = 0; i < num_text; ++i) {
23 if (text[i].key && strcmp(text[i].key, "Frames") == 0 && text[i].text) {
24 *frames = atoi(text[i].text);
25 break;
26 }
27 }
28 printf(" found frames = %d\n", *frames);
29 }
30
31 if (height % *frames != 0) {
32 printf("bad height (%d) for frame count (%d)\n", height, *frames);
33 result = -9;
34 goto exit;
35 }
36
37 surface = reinterpret_cast<GRSurface**>(malloc(*frames * sizeof(GRSurface*)));
38 if (surface == NULL) {
39 result = -8;
40 goto exit;
41 }
42 for (i = 0; i < *frames; ++i) {
43 surface[i] = init_display_surface(width, height / *frames);
44 if (surface[i] == NULL) {
45 result = -8;
46 goto exit;
47 }
48 }
49
50#if defined(RECOVERY_ABGR) || defined(RECOVERY_BGRA)
51 png_set_bgr(png_ptr);
52#endif
53
54 p_row = reinterpret_cast<unsigned char*>(malloc(width * 4));
55 for (y = 0; y < height; ++y) {
56 png_read_row(png_ptr, p_row, NULL);
57 int frame = y % *frames;
58 unsigned char* out_row = surface[frame]->data +
59 (y / *frames) * surface[frame]->row_bytes;
60 transform_rgb_to_draw(p_row, out_row, channels, width);
61 }
62 free(p_row);
63
64 *pSurface = reinterpret_cast<GRSurface**>(surface);
65
66exit:
67 png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
68
69 if (result < 0) {
70 if (surface) {
71 for (i = 0; i < *frames; ++i) {
72 if (surface[i]) free(surface[i]);
73 }
74 free(surface);
75 }
76 }
77 return result;
78}
關(guān)于圖片我們大概都知道怎么來(lái)顯示的了，所以，現(xiàn)在我們可以替換Android原生態(tài)中的圖片，換成我們自己的圖片，當(dāng)然，也不是什么圖都可以的，在recovery中，所有的png圖片必須是RGB且不帶且不能帶alhpa通道信息。關(guān)于這一點(diǎn)，我們可以看open_png這個(gè)函數(shù):
1static int open_png(const char* name, png_structp* png_ptr, png_infop* info_ptr,
2 png_uint_32* width, png_uint_32* height, png_byte* channels) {
3 char resPath[256];
4 unsigned char header[8];
5 int result = 0;
6 int color_type, bit_depth;
7 size_t bytesRead;
8
9 snprintf(resPath, sizeof(resPath)-1, "/res/images/%s.png", name);
10 resPath[sizeof(resPath)-1] = '\0';
11 FILE* fp = fopen(resPath, "rb");
12 if (fp == NULL) {
13 result = -1;
14 goto exit;
15 }
16
17 bytesRead = fread(header, 1, sizeof(header), fp);
18 if (bytesRead != sizeof(header)) {
19 result = -2;
20 goto exit;
21 }
22
23 if (png_sig_cmp(header, 0, sizeof(header))) {
24 result = -3;
25 goto exit;
26 }
27
28 *png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
29 if (!*png_ptr) {
30 result = -4;
31 goto exit;
32 }
33
34 *info_ptr = png_create_info_struct(*png_ptr);
35 if (!*info_ptr) {
36 result = -5;
37 goto exit;
38 }
39
40 if (setjmp(png_jmpbuf(*png_ptr))) {
41 result = -6;
42 goto exit;
43 }
44
45 png_init_io(*png_ptr, fp);
46 png_set_sig_bytes(*png_ptr, sizeof(header));
47 png_read_info(*png_ptr, *info_ptr);
48
49 png_get_IHDR(*png_ptr, *info_ptr, width, height, &bit_depth,
50 &color_type, NULL, NULL, NULL);
51
52 *channels = png_get_channels(*png_ptr, *info_ptr);
53
54 if (bit_depth == 8 && *channels == 3 && color_type == PNG_COLOR_TYPE_RGB) {
55 // 8-bit RGB images: great, nothing to do.
56 } else if (bit_depth <= 8 && *channels == 1 && color_type == PNG_COLOR_TYPE_GRAY) {
57 // 1-, 2-, 4-, or 8-bit gray images: expand to 8-bit gray.
58 png_set_expand_gray_1_2_4_to_8(*png_ptr);
59 } else if (bit_depth <= 8 && *channels == 1 && color_type == PNG_COLOR_TYPE_PALETTE) {
60 // paletted images: expand to 8-bit RGB. Note that we DON'T
61 // currently expand the tRNS chunk (if any) to an alpha
62 // channel, because minui doesn't support alpha channels in
63 // general.
64 png_set_palette_to_rgb(*png_ptr);
65 *channels = 3;
66 } else {
67 fprintf(stderr, "minui doesn't support PNG depth %d channels %d color_type %d\n",
68 bit_depth, *channels, color_type);
69 result = -7;
70 goto exit;
71 }
72
73 return result;
74
75 exit:
76 if (result < 0) {
77 png_destroy_read_struct(png_ptr, info_ptr, NULL);
78 }
79 if (fp != NULL) {
80 fclose(fp);
81 }
82
83 return result;
84}
在代碼中，我們可以看到如下：
1 if (bit_depth == 8 && *channels == 3 && color_type == PNG_COLOR_TYPE_RGB) {
2 // 8-bit RGB images: great, nothing to do.
3 } else if (bit_depth <= 8 && *channels == 1 && color_type == PNG_COLOR_TYPE_GRAY) {
4 // 1-, 2-, 4-, or 8-bit gray images: expand to 8-bit gray.
5 png_set_expand_gray_1_2_4_to_8(*png_ptr);
6 } else if (bit_depth <= 8 && *channels == 1 && color_type == PNG_COLOR_TYPE_PALETTE) {
7 // paletted images: expand to 8-bit RGB. Note that we DON'T
8 // currently expand the tRNS chunk (if any) to an alpha
9 // channel, because minui doesn't support alpha channels in
10 // general.
11 png_set_palette_to_rgb(*png_ptr);
12 *channels = 3;
13 } else {
14 fprintf(stderr, "minui doesn't support PNG depth %d channels %d color_type %d\n",
15 bit_depth, *channels, color_type);
16 result = -7;
17 goto exit;
18 }
以下參考一位網(wǎng)友給出的解決方案。
這個(gè)函數(shù)將圖片文件的數(shù)據(jù)讀取到內(nèi)存，我在其中輸出了一些調(diào)試信息，輸出圖片的 color_type, channels 等信息。查看LOG發(fā)現(xiàn)，android原生的圖片 channels == 3，channels 即色彩通道個(gè)數(shù)，等于 3 的話，意味著只有 R,G,B 三個(gè)通道的信息，沒(méi)有 ALPHA 通道信息！這段代碼的邏輯是如果channels 不等于3， 則按channels = 1 來(lái)處理，即灰度圖。美工給的圖片是帶 alpha通道信息的，即channels = 4，被當(dāng)成灰度圖像來(lái)處理了，怪不得顯示的效果是灰度圖像。我一直以為 png 圖像就只有一種格式，都是帶有 alpha通道的。。。使用圖像處理工具(photoshop 或者 gimp)，將美工給的圖片去掉 alpha 通道信息，再替換recovery 的圖片，編譯，替換recovery.img ，reboot -r 。圖片終于正常顯示啦。
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