recovery 界面汉化过程详解
一. 主要是针对recovery汉化，主要汉化对象是界面显示为中文。
二. 基于中文的汉化，有两种方式，一种是基于GB2312的编码格式汉化，另外一种是基于unicode编码格式汉化。下面介绍unicode中文汉化。
三. 汉化主要需要修改四个文件，汉化步骤：
3.1 default_device.cpp修改，主界面汉化
增加中文的界面，但是由于是unicode编码，所以在source insight里面显示乱码：
这些看似乱码，我们可以这样获取，桌面新建txt文档，使用notepad++工具打开， 选择格式，以UTF-8 无BOM格式编码，里面写入需要显示的汉字，然后保存，然后把新建的txt使用source insight打开即可。
3.2 unicode的中文字库获取，网上可以下载, eg：fontcn30_18x48.h
3.3 针对unicode的解析源文件graphics_cn.c
/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdbool.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <linux/fb.h>
#include <linux/kd.h>
#include <time.h>
#include "fontcn30_18x48.h"
//#include "font_10x18.h"
#include "minui.h"
#include "graphics.h"
typedef struct {
GRSurface* texture;
unsigned offset[97];
void** fontdata;
unsigned count;
unsigned *unicodemap;
unsigned char *cwidth;
unsigned char *cheight;
unsigned ascent;
} GRFont;
static GRFont* gr_font = NULL;
static minui_backend* gr_backend = NULL;
static int overscan_percent = OVERSCAN_PERCENT;
static int overscan_offset_x = 0;
static int overscan_offset_y = 0;
static int gr_vt_fd = -1;
const unsigned cw_en = 10;
static unsigned char gr_current_r = 255;
static unsigned char gr_current_g = 255;
static unsigned char gr_current_b = 255;
static unsigned char gr_current_a = 255;
static GRSurface* gr_draw = NULL;
static bool outside(int x, int y)
{
return x < 0 || x >= gr_draw->width || y < 0 || y >= gr_draw->height;
}
int getUNICharID(unsigned short unicode, void* pFont)
{
int i;
GRFont *gfont = (GRFont*) pFont;
if (!gfont) gfont = gr_font;
for (i = 0; i < gfont->count; i++) {
if (unicode == gfont->unicodemap[i]) return i;
}
return -1;
}
int gr_measure(const char *s)
{
return 0;
}
void gr_font_size(int *x, int *y)
{
*x = gr_font->cwidth[100];
*y = gr_font->cheight[100];
}
static void text_blend(unsigned char* src_p, int src_row_bytes,
unsigned char* dst_p, int dst_row_bytes,
int width, int height)
{
int i, j;
for (j = 0; j < height; ++j) {
unsigned char* sx = src_p;
unsigned char* px = dst_p;
for (i = 0; i < width; ++i) {
unsigned char a = *sx++;
if (gr_current_a < 255) a = ((int)a * gr_current_a) / 255;
if (a == 255) {
*px++ = gr_current_r;
*px++ = gr_current_g;
*px++ = gr_current_b;
*px++ = 255;
} else if (a > 0) {
*px = (*px * (255-a) + gr_current_r * a) / 255;
++px;
*px = (*px * (255-a) + gr_current_g * a) / 255;
++px;
*px = (*px * (255-a) + gr_current_b * a) / 255;
++px;
*px++ = 255;
} else {
px += 3;
*px++ = 255;
}
}
src_p += src_row_bytes;
dst_p += dst_row_bytes;
}
}
void gr_text(int x, int y, const char *s, int bold)
{
GRFont *font = gr_font;
unsigned off, n , width, height;
unsigned off2;
unsigned off3;
wchar_t ch;
int id;
unsigned short unicode;
if (!font->texture) return;
if (gr_current_a == 0) return;
x += overscan_offset_x;
y += overscan_offset_y;
//printf("--------%X %X %X %X\n", s[0], s[1], s[2], s[3]);
while((off = *s++)) {
if (off < 0x80)
{
//ASCII 不处理
} else {
if ((off & 0xF0) == 0xE0)
{
off2 = *s++;
off3 = *s++;
unicode = (off & 0x1F) << 12;
unicode |= (off2 & 0x3F) << 6;
unicode |= (off3 & 0x3F);
id = getUNICharID(unicode, font);
//printf("%X %X %X %X %d\n", off, off2, off3, unicode, id);
if (id >= 0) {
width = font->cwidth[id];
height = font->cheight[id];
unsigned char* src_p = font->fontdata[id];
unsigned char* dst_p = gr_draw->data + y*gr_draw->row_bytes + x*gr_draw->pixel_bytes;
text_blend(src_p, font->texture->row_bytes,dst_p, gr_draw->row_bytes,width, height);
x += width;
} else {
x += width;
}
} else {
x += cw_en;
}
}
}
}
void gr_texticon(int x, int y, GRSurface* icon) {
if (icon == NULL) return;
if (icon->pixel_bytes != 1) {
printf("gr_texticon: source has wrong format\n");
return;
}
x += overscan_offset_x;
y += overscan_offset_y;
if (outside(x, y) || outside(x+icon->width-1, y+icon->height-1)) return;
unsigned char* src_p = icon->data;
unsigned