Android ndk 使用libpng加载图像会产生意外的像素数据

我在尝试将png文件加载到我的应用程序时遇到问题。它似乎可以很好地加载标题，并识别出图像是png，但由于某种原因，输出具有相同的值，尽管图像实际上不是一种颜色。另一件让我头疼的事是16个字节没有读

我的代码：

AAsset*pngAsset=0；
AAssetManager*pngAassetManager=0；
无效png\u资产\u读取（png\u结构png、png\u字节数据、png\u大小\u t大小）{
//AAsset_seek（pngAsset_，0,0）；
AASET_读取（pngAsset_、数据、大小）；
int NUMBYTESREMAING=AAsset_getRemainingLength（pngAsset_uu）；
LOGI（“读取大小：%d，剩余：%d”，大小，数量保留）；
}
图像*loadPngFile（AAssetManager*assetManager）{
pngAassetManager=资产管理者；
LOGI（“尝试加载图像…”）；
int HEADER_SIZE=8；
字符串filename=“skybox.png”；
pngAsset_uu=AAssetManager_u打开（pngAassetManager_u，filename.c_str（），
AASSET_模式_未知）；
if（pngAsset_==0）{
LOGW（“未找到资产\%s\”，filename.c_str（）；
返回0；
}
off\u t bufferSize=AAsset\u getLength（pngAsset）；
png_字节*缓冲区=新的png_字节[标题大小]；
int numBytesRead=AAsset\u read（pngAsset\u、缓冲区、标题大小）；
int NUMBYTESREMAING=AAsset_getRemainingLength（pngAsset_uu）；
int是png=！png\u sig\u cmp（缓冲区，0,8）；
如果（！is_png）{
LOGE（“文件%s格式不是PNG。”，filename.c_str（））；
返回0；
}
LOGI（“文件大小：%d，读取字节：%d，剩余字节：%d”，
缓冲区大小，numbytes读取，numbytes保留）；
png_structp png_ptr=png_create_read_struct（png_LIBPNG_VER_STRING，NULL，
空，空）；
如果（！png_ptr）{
LOGE（“无法创建PNG结构：%s”，filename.c_str（））；
返回0；
}
png_infop info_ptr=png_create_info_struct（png_ptr）；
如果（！info_ptr）{
png_destroy_read_struct（&png_ptr，（png_infopp）NULL，（png_infopp）NULL）；
LOGE（“无法创建png信息：%s”，filename.c_str（））；
返回0；
}
png_infop end_info=png_create_info_struct（png_ptr）；
如果（！end_info）{
png_destroy_read_struct（&png_ptr，&info_ptr，（png_infopp）NULL）；
LOGE（“无法创建png结束信息：%s”，filename.c_str（））；
返回0；
}
if（setjmp（png_jmpbuf（png_ptr）））{
LOGE（“setjmp时出错：%s”，filename.c_str（））；
png_destroy_read_struct（&png_ptr，&info_ptr，&end_info）；
返回0；
}
png\u set\u read\u fn（png\u ptr，NULL，png\u asset\u read）；
png_set_sig_字节（png_ptr，8）；
png_read_info（png_ptr，info_ptr）；
int位深度、颜色类型；
巴布亚新几内亚32倍，右侧；
png_获取IHDR（png_ptr、info_ptr、twidth、thight、bit_depth和color_type、，
空，空，空）；
LOGI（“宽度：%d，高度：%d.”，宽度，宽度）；
//更新png信息结构。
png_读取_更新_信息（png_ptr，info_ptr）；
//行大小（字节）。
int rowbytes=png_get_rowbytes（png_ptr，info_ptr）；
LOGI（“行大小：%d字节。”，行字节）；
//将图像数据作为一个大块分配给opengl
png_字节*图像_数据=新的png_字节[行字节*右侧]；
如果（！图像_数据）{
//清理内存并关闭文件
png_destroy_read_struct（&png_ptr，&info_ptr，&end_info）；
洛格(
“加载%s时无法分配图像数据”，filename.c_str（）；
}
//行指针用于指向图像数据，以便使用libpng读取png
png_bytep*行指针=新的png_bytep[theight]；
如果（！行指针）{
//清理内存并关闭文件
png_destroy_read_struct（&png_ptr，&info_ptr，&end_info）；
删除[]图像数据；
洛格(
“加载%s时无法分配行指针”，filename.c_str（））；
}
//将单个行指针设置为指向图像数据的正确偏移
对于（int i=0；i

输出：

06-30 23:49:00.651: I/Ghost Engine(21279): Trying to load image...
06-30 23:49:00.651: I/Ghost Engine(21279): Size of the file: 529452, bytes read: 8, bytes remain: 529444
06-30 23:49:00.651: I/Ghost Engine(21279): Read size: 8, remaining: 529436
06-30 23:49:00.651: I/Ghost Engine(21279): Read size: 13, remaining: 529423
06-30 23:49:00.651: I/Ghost Engine(21279): Read size: 4, remaining: 529419
06-30 23:49:00.651: I/Ghost Engine(21279): Read size: 8, remaining: 529411
06-30 23:49:00.651: I/Ghost Engine(21279): Read size: 9, remaining: 529402
06-30 23:49:00.651: I/Ghost Engine(21279): Read size: 4, remaining: 529398
06-30 23:49:00.651: I/Ghost Engine(21279): Read size: 8, remaining: 529390
06-30 23:49:00.651: I/Ghost Engine(21279): Read size: 32, remaining: 529358
06-30 23:49:00.651: I/Ghost Engine(21279): Read size: 4, remaining: 529354
06-30 23:49:00.651: I/Ghost Engine(21279): Read size: 8, remaining: 529346
06-30 23:49:00.651: I/Ghost Engine(21279): Width: 1024, height: 1024.
06-30 23:49:00.651: I/Ghost Engine(21279): Row size: 4096 bytes.
06-30 23:49:00.651: I/Ghost Engine(21279): Read size: 8192, remaining: 521154
06-30 23:49:00.681: I/Ghost Engine(21279): Read size: 8192, remaining: 512962
06-30 23:49:00.681: I/Ghost Engine(21279): Read size: 8192, remaining: 504770
06-30 23:49:00.691: I/Ghost Engine(21279): Read size: 8192, remaining: 496578
06-30 23:49:00.701: I/Ghost Engine(21279): Read size: 8192, remaining: 488386
06-30 23:49:00.721: I/Ghost Engine(21279): Read size: 8192, remaining: 480194
06-30 23:49:00.721: I/Ghost Engine(21279): Read size: 8192, remaining: 472002
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06-30 23:49:00.731: I/Ghost Engine(21279): Read size: 8192, remaining: 455618
06-30 23:49:00.731: I/Ghost Engine(21279): Read size: 8192, remaining: 447426
06-30 23:49:00.741: I/Ghost Engine(21279): Read size: 8192, remaining: 439234
06-30 23:49:00.741: I/Ghost Engine(21279): Read size: 8192, remaining: 431042
06-30 23:49:00.741: I/Ghost Engine(21279): Read size: 8192, remaining: 422850
06-30 23:49:00.741: I/Ghost Engine(21279): Read size: 8192, remaining: 414658
06-30 23:49:00.741: I/Ghost Engine(21279): Read size: 8192, remaining: 406466
06-30 23:49:00.741: I/Ghost Engine(21279): Read size: 8192, remaining: 398274
06-30 23:49:00.751: I/Ghost Engine(21279): Read size: 8192, remaining: 390082
06-30 23:49:00.751: I/Ghost Engine(21279): Read size: 8192, remaining: 381890
06-30 23:49:00.751: I/Ghost Engine(21279): Read size: 8192, remaining: 373698
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06-30 23:49:00.761: I/Ghost Engine(21279): Read size: 8192, remaining: 332738
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06-30 23:49:00.761: I/Ghost Engine(21279): Read size: 8192, remaining: 299970
06-30 23:49:00.761: I/Ghost Engine(21279): Read size: 8192, remaining: 291778
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06-30 23:49:00.841: I/Ghost Engine(21279): Read size: 8192, remaining: 21442
06-30 23:49:00.841: I/Ghost Engine(21279): Read size: 8192, remaining: 13250
06-30 23:49:00.841: I/Ghost Engine(21279): Read size: 8192, remaining: 5058
06-30 23:49:00.851: I/Ghost Engine(21279): Read size: 5042, remaining: 16
06-30 23:49:00.861: I/Ghost Engine(21279): Pixel 0: 0.000000 0.000000 1197.166992 1420.242434
06-30 23:49:00.861: I/Ghost Engine(21279): Pixel 1: 0.000000 0.000000 1197.166992 1420.242434
06-30 23:49:00.861: I/Ghost Engine(21279): Pixel 2: 0.000000 0.000000 1197.166992 1420.242434
06-30 23:49:00.861: I/Ghost Engine(21279): Pixel 3: 0.000000 0.000000 1197.166992 1420.242434
06-30 23:49:00.861: I/Ghost Engine(21279): Pixel 4: 0.000000 0.000000 1197.166992 1420.242434
06-30 23:49:00.861: I/Ghost Engine(21279): Pixel 5: 0.000000 0.000000 1197.166992 1420.242434
06-30 23:49:00.861: I/Ghost Engine(21279): Pixel 6: 0.000000 0.000000 1197.166992 1420.242434
06-30 23:49:00.861: I/Ghost Engine(21279): Pixel 7: 0.000000 0.000000 1197.166992 1420.242434
06-30 23:49:00.861: I/Ghost Engine(21279): Pixel 8: 0.000000 0.000000 1197.166992 1420.242434
06-30 23:49:00.861: I/Ghost Engine(21279): Pixel 9: 0.000000 0.000000 1197.166992 1420.242434
06-30 23:49:00.871: I/Ghost Engine(21279): Image id: 1.
06-30 23:49:00.871: I/Ghost Engine(21279): Image dimensions: 1024 x 1024
06-30 23:49:00.871: I/Ghost Engine(21279): Image size: 4194304

有什么想法会让一切都开始出错吗？ 谢谢，Martin。

发现问题：

"Pixel %d: %f %f %f %f"

应该是：

"Pixel %d: %d %d %d %d"

显然，图像加载良好