stbi_load() 对读取图片的像素数有限制吗

Question

我使用stbi_load()加载图片失败，但是没有报错。

unsigned char* data = stbi_load("world_test.jpg", &width, &height, &nrChannel, 0); 
if (data) 
{
    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
    glGenerateMipmap(GL_TEXTURE_2D);
}
else 
{
    cout << "load image failed" << endl;
}

此“world_test.jpg”是 43K * 21k JPG 图片，函数 stbi_load() 无法读取图片。但是之前的 21k * 10K "world.jpg" 可以读取。两张图片的其他属性相同。是不是因为图片像素太大？

Answer 1

头文件本身有something to say这个：

// Note that stb_image pervasively uses ints in its public API for sizes,
// including sizes of memory buffers. This is now part of the API and thus
// hard to change without causing breakage. As a result, the various image
// loaders all have certain limits on image size; these differ somewhat
// by format but generally boil down to either just under 2GB or just under
// 1GB. When the decoded image would be larger than this, stb_image decoding
// will fail.
//
// Additionally, stb_image will reject image files that have any of their
// dimensions set to a larger value than the configurable STBI_MAX_DIMENSIONS,
// which defaults to 2**24 = 16777216 pixels. Due to the above memory limit,
// the only way to have an image with such dimensions load correctly
// is for it to have a rather extreme aspect ratio. Either way, the
// assumption here is that such larger images are likely to be malformed
// or malicious. If you do need to load an image with individual dimensions
// larger than that, and it still fits in the overall size limit, you can
// #define STBI_MAX_DIMENSIONS on your own to be something larger.