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全志G2D实现屏幕旋转，开机logo实现手动旋转。
本文主要是介绍全志G2D实现屏幕旋转，开机logo实现手动旋转。，对大家解决编程问题具有一定的参考价值，需要的程序猿们随着小编来一起学习吧！
产品设计出来之后啊，大家使用的时候觉得反过来使用更加便捷。但是屏幕显示是反的。那怎么办那？？？？？
修改硬件费时费工，那能否软件实现那？？？？？
如果纯软件使用那就太费系统资源了。于是就想到了使用全志R528 自带的G2D功能（硬件加速功能）。
使用它进行旋转，后又发现uboot阶段系统没有G2D导致开机logo不能自动旋转，内核启动后G2D 启动logo 又旋转了。
（好烦啊！！！！！！！！！！！！）
于是就需要把uboot 阶段手动把图片数据旋转过来。在G2D启动前把uboot 传递给内核的logo 图片数据也旋转过来。
下面具体步骤：
一、开启G2D功能。
1、由于此前公版默认在modules.mk屏蔽了屏旋转相关配置, 如果你的版本是禁用旋转的, 需要把相关配置去掉.
device/config/chips/r528/configs/evb1/linux-5.4/config-5.4
2759:# CONFIG_SUNXI_DISP2_FB_DISABLE_ROTATE is not set
以下3个相关选项
CONFIG_DISP2_SUNXI=m \ #CONFIG_SUNXI_DISP2_FB_DISABLE_ROTATE=y \ #CONFIG_SUNXI_DISP2_FB_ROTATION_SUPPORT=n \ #CONFIG_SUNXI_DISP2_FB_HW_ROTATION_SUPPORT=n \ 修改为：
CONFIG_DISP2_SUNXI=m \ #CONFIG_SUNXI_DISP2_FB_DISABLE_ROTATE=n \ #CONFIG_SUNXI_DISP2_FB_ROTATION_SUPPORT=n \ #CONFIG_SUNXI_DISP2_FB_HW_ROTATION_SUPPORT=y \
2、硬件旋转需要确保G2D驱动已经使能
make kernel_menuconfig Device Drivers ---> <*> SUNXI G2D Driver [*] sunxi g2d mixer module [*] sunxi g2d rotate module [] sunxi sync fence implement for rotate jobs synchronous
3.打开显示驱动旋转支持
make kernel_menuconfig Device Drivers ---> Graphics support ---> Frame buffer Devices ---> Video support for sunxi ---> DISP2 Framebuffer rotation support (Disable rotation) ---> ( ) Disable rotation ( ) Software rotation support (不要选这个,方案未支持) (X) Hardware(G2D) rotation support (选择G2D旋转)
4.dts配置
board.dts 和 uboot-board.dts同步修改.
&disp{
.....
disp_rotation_used = <1>;/* 使能旋转功能 */
degree0 = <2>; /* X:screen index; 0:0 degree; 1:90 degree; 3:270 degree */
fb0_width = <800>;/*fb 的长宽交换*/
fb0_height = <480>;
.....
};
5.旋转后framebuffer编程是需要注意,旋转后的buffer不会直接显示到屏幕上, 需要在应用刷屏的地方调用FBIOPAN_DISPLAY接口.同步旋转后的buffer到LCD上.
以修改公版旋转的GUI刷屏示例:
路径:package/gui/littlevgl-6/lv_drivers/display/fbdev.c
void fbdev_flush(lv_disp_drv_t * drv, const lv_area_t * area, lv_color_t * color_p){
....
lv_disp_flush_ready(drv);
ioctl(fbfd, FBIOPAN_DISPLAY, &vinfo); /*函数最后,在刷屏函数后面,调用 FBIOPAN_DISPLAY 接口*/
}
我们系统时自己的UI系统。是在重绘回调函数中，增加FBIOPAN_DISPLAY
main()
{
int fp=0;
struct fb_var_screeninfo vinfo;
struct fb_fix_screeninfo finfo;
fp = open("/dev/fb0", O_RDWR);
if(fp < 0) {
printf("Error : Can not open framebuffer device/n");
exit(1);
}
if(ioctl(fp, FBIOGET_VSCREENINFO, &vinfo)){
printf("Error reading variable information/n");
exit(3);
}
vinfo.xoffset = 0;
vinfo.yoffset = 0;
}
void sys_paint(void) // 每次重绘调用一次
{
ioctl(fbfd, FBIOPAN_DISPLAY, &vinfo); /*函数最后,在刷屏函数后面,调用 FBIOPAN_DISPLAY 接口*/
}
二、uboot阶段手动修改旋转图片数据
追踪uboot logo 执行过程
static int run_main_loop(void)
{
....
#ifdef CONFIG_ARCH_SUNXI
initr_sunxi_plat,
#endif
....
}
initr_sunxi_plat
{
....
#ifdef CONFIG_BOOT_GUI
void board_bootlogo_display(void);
board_bootlogo_display();
#else
....
}
void board_bootlogo_display(void)
{
....
#if defined(CONFIG_CMD_SUNXI_BMP)
sunxi_bmp_display("bootlogo.bmp"); //指定bootlogo的名字。通过修改这个地方可以修改指定logo的名称
#elif defined(CONFIG_CMD_SUNXI_JPEG)
sunxi_jpeg_display("bootlogo.jpg");
#endif
....
}
int sunxi_bmp_display(char *name)
{
int ret = -1;
char *argv[6];
char bmp_head[32];273
char bmp_name[32];
char part_info[16] = {0};
char size[32] = {0};
int partno = -1;
unsigned long file_size = 0;
char *bmp_head_addr;
struct bmp_image *bmp;
bmp = memalign(CONFIG_SYS_CACHELINE_SIZE, ALIGN(sizeof(struct bmp_header), CONFIG_SYS_CACHELINE_SIZE));
if (bmp) {
sprintf(bmp_head, "%lx", (ulong)bmp);
} else {
pr_error("sunxi bmp: alloc buffer for %s fail\n", name);
goto out;
}
partno = sunxi_partition_get_partno_byname("bootloader"); /*android*/
if (partno < 0) {
partno = sunxi_partition_get_partno_byname(
"boot-resource"); /*linux*/
if (partno < 0) {
pr_error("Get bootloader and boot-resource partition number fail!\n");
goto free1;
}
}
snprintf(part_info, 16, "0:%x", partno);
strncpy(bmp_name, name, sizeof(bmp_name));
snprintf(size, 16, "%lx", (ulong)sizeof(struct bmp_header));
argv[0] = "fatload";
argv[1] = "sunxi_flash";
argv[2] = part_info;
argv[3] = bmp_head;
argv[4] = bmp_name;
argv[5] = size;
if (do_fat_fsload(0, 0, 6, argv)) {
pr_error("sunxi bmp info error : unable to open logo file %s\n",
argv[4]);
goto free1;
}
if ((bmp->header.signature[0] != 'B') ||
(bmp->header.signature[1] != 'M')) {
pr_error("this is not a bmp picture\n");
goto free1;
}
file_size = bmp->header.file_size;
bmp_head_addr = memalign(CONFIG_SYS_CACHELINE_SIZE, ALIGN(file_size, CONFIG_SYS_CACHELINE_SIZE));
if (bmp_head_addr) {
sprintf(bmp_head, "%lx", (ulong)bmp_head_addr);
} else {
pr_error("sunxi bmp: alloc buffer for %s fail\n", name);
goto free1;
}
snprintf(size, 16, "%lx", (ulong)file_size);
tick_printf("bmp_name=%s size %ld\n", bmp_name, file_size);
if (do_fat_fsload(0, 0, 6, argv)) {
pr_error("sunxi bmp info error : unable to open logo file %s\n",
argv[4]);
goto free2;
}
//在调用show_bmp_on_fb 之前将bmp_head_addr中的图片数据进行旋转
// 调用旋转函数
rotateBMP180(bmp_head_addr);
ret = show_bmp_on_fb(bmp_head_addr, FB_ID_0);
if (ret != 0)
pr_error("show bmp on fb failed !%d\n", ret);
free2:
free(bmp_head_addr);
free1:
free(bmp);
out:
return ret;
}
旋转函数：
主要发现uboot 阶段malloc不能申请太大的内存空间，所以代码中申请的行的大小。
#pragma pack(push, 1)
typedef struct {
uint16_t type;
uint32_t size;
uint16_t reserved1;
uint16_t reserved2;
uint32_t offset;
} BMPFileHeader;
#pragma pack(pop)
// 定义BMP图像信息头结构体
#pragma pack(push, 1)
typedef struct {
uint32_t header_size;
int32_t width;
int32_t height;
uint16_t planes;
uint16_t bit_count;
uint32_t compression;
uint32_t image_size;
int32_t x_pixels_per_meter;
int32_t y_pixels_per_meter;
uint32_t colors_used;
uint32_t colors_important;
} BMPInfoHeader;
#pragma pack(pop)
// 旋转BMP图像180度
void rotateBMP180(char * bmp_head_add) {
// 读取文件头
BMPFileHeader* file_header = (BMPFileHeader*)bmp_head_add;
// 读取图像信息头
BMPInfoHeader* info_header = (BMPInfoHeader*)(bmp_head_add + sizeof(BMPFileHeader));
// 获取图像宽度、高度和每行像素所占字节数
int32_t width = info_header->width;
int32_t height = info_header->height;
uint32_t row_size = (info_header->bit_count * width + 31) / 32 * 4;
// 创建临时缓冲区存储旋转后的图像数据
uint8_t* temp_data = (uint8_t*)malloc(row_size);
if (temp_data == NULL) {
printf("Failed to allocate memory for temporary data.\n");
return;
}
// 旋转图像
for (int32_t row = 0; row < height / 2; ++row) {
for (int32_t col = 0; col < width; ++col) {
// 计算当前像素位置和对应的对称像素位置
int32_t original_index = row * row_size + col * 3;
int32_t symmetric_index = (height - 1 - row) * row_size + (width - 1 - col) * 3;
// 交换像素颜色值
uint8_t temp_red = bmp_head_add[file_header->offset + original_index];
uint8_t temp_green = bmp_head_add[file_header->offset + original_index + 1];
uint8_t temp_blue = bmp_head_add[file_header->offset + original_index + 2];
bmp_head_add[file_header->offset + original_index] = bmp_head_add[file_header->offset + symmetric_index];
bmp_head_add[file_header->offset + original_index + 1] = bmp_head_add[file_header->offset + symmetric_index + 1];
bmp_head_add[file_header->offset + original_index + 2] = bmp_head_add[file_header->offset + symmetric_index + 2];
bmp_head_add[file_header->offset + symmetric_index] = temp_red;
bmp_head_add[file_header->offset + symmetric_index + 1] = temp_green;
bmp_head_add[file_header->offset + symmetric_index + 2] = temp_blue;
}
}
// 释放临时缓冲区内存
free(temp_data);
}
三、kernel阶段手动修改旋转logo图片数据
追踪内核执行过程
disp_module_init{
........
platform_driver_unregister(&disp_driver);
#ifndef CONFIG_OF
platform_device_unregister(&disp_device);
#endif
........
}
static int disp_probe(struct platform_device *pdev){
........
bsp_disp_init(para);
........
}
static s32 disp_init(struct platform_device *pdev)
{
........
lcd_init();
bsp_disp_open();
fb_init(pdev);
........
}
s32 fb_init(struct platform_device *pdev)
{
........
ret = display_fb_request(i, &fb_para);
........
}
static s32 display_fb_request(u32 fb_id, struct disp_fb_create_info *fb_para)
{
........
Fb_map_kernel_logo(sel, info);
........
}
static int Fb_map_kernel_logo(u32 sel, struct fb_info *info)
{
........
paddr = bootlogo_addr;
if (paddr == 0) {
__inf("Fb_map_kernel_logo failed!");
return Fb_copy_boot_fb(sel, info);
}
........
}
static int Fb_copy_boot_fb(u32 sel, struct fb_info *info)
{
enum {
BOOT_FB_ADDR = 0,
BOOT_FB_WIDTH,
BOOT_FB_HEIGHT,
BOOT_FB_BPP,
BOOT_FB_STRIDE,
BOOT_FB_CROP_L,
BOOT_FB_CROP_T,
BOOT_FB_CROP_R,
BOOT_FB_CROP_B,
};
char *boot_fb_str = NULL;
char *src_phy_addr = NULL;
char *src_addr = NULL;
char *src_addr_b = NULL;
char *src_addr_e = NULL;
int src_width = 0;
int src_height = 0;
int fb_height = 0;
int src_bpp = 0;
int src_stride = 0;
int src_cp_btyes = 0;
int src_crop_l = 0;
int src_crop_t = 0;
int src_crop_r = 0;
int src_crop_b = 0;
char *dst_addr = NULL;
int dst_width = 0;
int dst_height = 0;
int dst_bpp = 0;
int dst_stride = 0;
int ret;
unsigned long map_offset;
if (info == NULL) {
__wrn("%s,%d: null pointer\n", __func__, __LINE__);
return -1;
}
boot_fb_str = (char *)disp_boot_para_parse_str("boot_fb0");
if (boot_fb_str != NULL) {
int i = 0;
char boot_fb[128] = { 0 };
int len = strlen(boot_fb_str);
if (sizeof(boot_fb) - 1 < len) {
__wrn("need bigger array size[%d] for boot_fb\n", len);
return -1;
}
memcpy((void *)boot_fb, (void *)boot_fb_str, len);
boot_fb[len] = '\0';
boot_fb_str = boot_fb;
for (i = 0;; ++i) {
char *p = strstr(boot_fb_str, ",");
if (p != NULL)
*p = '\0';
if (i == BOOT_FB_ADDR) {
ret = kstrtoul(boot_fb_str, 16,
(unsigned long *)&src_phy_addr);
if (ret)
pr_warn("parse src_phy_addr fail!\n");
} else if (i == BOOT_FB_WIDTH) {
ret = kstrtou32(boot_fb_str, 16, &src_width);
if (ret)
pr_warn("parse src_width fail!\n");
} else if (i == BOOT_FB_HEIGHT) {
ret = kstrtou32(boot_fb_str, 16, &src_height);
fb_height = src_height;
if (ret)
pr_warn("parse src_height fail!\n");
} else if (i == BOOT_FB_BPP) {
ret = kstrtou32(boot_fb_str, 16, &src_bpp);
if (ret)
pr_warn("parse src_bpp fail!\n");
} else if (i == BOOT_FB_STRIDE) {
ret = kstrtou32(boot_fb_str, 16, &src_stride);
if (ret)
pr_warn("parse src_stride fail!\n");
} else if (i == BOOT_FB_CROP_L) {
ret = kstrtou32(boot_fb_str, 16, &src_crop_l);
if (ret)
pr_warn("parse src_crop_l fail!\n");
} else if (i == BOOT_FB_CROP_T) {
ret = kstrtou32(boot_fb_str, 16, &src_crop_t);
if (ret)
pr_warn("parse src_crop_t fail!\n");
} else if (i == BOOT_FB_CROP_R) {
ret = kstrtou32(boot_fb_str, 16, &src_crop_r);
if (ret)
pr_warn("parse src_crop_r fail!\n");
} else if (i == BOOT_FB_CROP_B) {
ret = kstrtou32(boot_fb_str, 16, &src_crop_b);
if (ret)
pr_warn("parse src_crop_b fail!\n");
} else {
break;
}
if (p == NULL)
break;
boot_fb_str = p + 1;
}
} else {
__wrn("no boot_fb0\n");
return -1;
}
dst_addr = (char *)(info->screen_base);
dst_width = info->var.xres;
dst_height = info->var.yres;
dst_bpp = info->var.bits_per_pixel;
dst_stride = info->fix.line_length;
if ((src_phy_addr == NULL)
|| (src_width <= 0)
|| (src_height <= 0)
|| (src_stride <= 0)
|| (src_bpp <= 0)
|| (dst_addr == NULL)
|| (dst_width <= 0)
|| (dst_height <= 0)
|| (dst_stride <= 0)
|| (dst_bpp <= 0)
|| (src_bpp != dst_bpp)) {
__wrn
("wrong para: src[phy_addr=%p,w=%d,h=%d,bpp=%d,stride=%d], dst[addr=%p,w=%d,h=%d,bpp=%d,stride=%d]\n",
src_phy_addr,
src_width, src_height, src_bpp, src_stride, dst_addr,
dst_width, dst_height, dst_bpp, dst_stride);
return -1;
}
map_offset = (unsigned long)src_phy_addr + PAGE_SIZE
- PAGE_ALIGN((unsigned long)src_phy_addr + 1);
src_addr = (char *)Fb_map_kernel_cache((unsigned long)src_phy_addr -
map_offset,
src_stride * src_height +
map_offset);
if (src_addr == NULL) {
__wrn("Fb_map_kernel_cache for src_addr failed\n");
return -1;
}
src_addr_b = src_addr + map_offset;
if ((src_crop_b > src_crop_t) &&
(src_height > src_crop_b - src_crop_t) &&
(src_crop_t >= 0) &&
(src_height >= src_crop_b)) {
src_height = src_crop_b - src_crop_t;
src_addr_b += (src_stride * src_crop_t);
}
if ((src_crop_r > src_crop_l)
&& (src_width > src_crop_r - src_crop_l)
&& (src_crop_l >= 0)
&& (src_width >= src_crop_r)) {
src_width = src_crop_r - src_crop_l;
src_addr_b += (src_crop_l * src_bpp >> 3);
}
// 旋转图片数据
// rotateImage180(src_addr_b, src_width, src_height, src_bpp, src_stride);
if (src_height < dst_height) {
int dst_crop_t = (dst_height - src_height) >> 1;
dst_addr += (dst_stride * dst_crop_t);
} else if (src_height > dst_height) {
__wrn("src_height(%d) > dst_height(%d),please cut the height\n",
src_height,
dst_height);
Fb_unmap_kernel(src_addr);
return -1;
}
if (src_width < dst_width) {
int dst_crop_l = (dst_width - src_width) >> 1;
dst_addr += (dst_crop_l * dst_bpp >> 3);
} else if (src_width > dst_width) {
__wrn("src_width(%d) > dst_width(%d),please cut the width!\n",
src_width,
dst_width);
Fb_unmap_kernel(src_addr);
return -1;
}
src_cp_btyes = src_width * src_bpp >> 3;
src_addr_e = src_addr_b + src_stride * src_height;
for (; src_addr_b != src_addr_e; src_addr_b += src_stride) {
memcpy((void *)dst_addr, (void *)src_addr_b, src_cp_btyes);
dst_addr += dst_stride;
}
//再此地方旋转修改
dst_addr = (char *)(info->screen_base);
rotateImage180(dst_addr, dst_width, dst_height, dst_bpp, dst_stride);
Fb_unmap_kernel(src_addr);
memblock_free((unsigned long)src_phy_addr, src_stride * fb_height);
free_reserved_area(__va(src_phy_addr), __va(src_phy_addr + PAGE_ALIGN(src_stride * fb_height)), 0x00, "logo buffer");
return 0;
}
旋转180函数：
放在 tina-r528\lichee\linux-5.4\drivers\video\fbdev\sunxi\disp2\disp\dev_fb.c
注意此处由于申请的内存空间比较大，所以用的是vmalloc
void rotateImage180(char* src_addr, int width, int height, int bpp, int stride) {
// 计算每行像素数据的字节数
int row_bytes = width * (bpp / 8);
char * src_addr_e = src_addr + stride* height; //最后的地址位置
// 创建临时缓冲区用于保存旋转后的图像数据
char* temp_data = vmalloc(row_bytes * height);
int y=0,x=0;
// 复制旋转后的图像数据到临时缓冲区
for (y = 0; y < height; y++) {
char* src_row_start = src_addr + (y * stride);
char* dest_row_start = temp_data + ((height - 1 - y) * row_bytes);
// 复制像素数据并进行左右翻转
for ( x = 0; x < width; x++) {
char* src_pixel = src_row_start + (x * (bpp / 8));
char* dest_pixel = dest_row_start + ((width - 1 - x) * (bpp / 8));
// 复制像素值
memcpy(dest_pixel, src_pixel, (bpp / 8));
}
} //printk("----%s--%d\n",__func__,__LINE__);
// 将旋转后的图像数据写回原始内存地址
for (; src_addr != src_addr_e; src_addr += stride) { //循环复制每一行
memcpy((void *)src_addr, (void *)temp_data, row_bytes);
temp_data += row_bytes; //地址是增加地址宽度
}
//printk("----%s--%d\n",__func__,__LINE__);
// 释放临时缓冲区
vfree(temp_data);
}
参考资料：
(67条消息) uboot修改启动logo-sunxi_u-boot启动时改横屏_Chasing_Chasing的博客-CSDN博客
【FAQ】全志F133（D1s）芯片 如何在Tina下进行显示旋转？ | 全志在线开发者论坛 (aw-ol.com)
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