- Supports Zig memory allocators
- Supports decoding most popular formats
- Supports HDR images
- Supports 8-bits and 16-bits per channel
- Supports image resizing
- Supports image writing (.png, .jpg)
Copy zstbi
to a subdirectory of your project and add the following to your build.zig.zon
.dependencies:
.zstbi = .{ .path = "libs/zstbi" },
Then in your build.zig
add:
pub fn build(b: *std.Build) void {
const exe = b.addExecutable(.{ ... });
const zstbi = b.dependency("zstbi", .{});
exe.root_module.addImport("zstbi", zstbi.module("root"));
exe.linkLibrary(zstbi.artifact("zstbi"));
}
Now in your code you may import and use zstbi
.
Init the lib. zstbi.init()
is cheap and you may call it whenever you need to change memory allocator. Must be called from the main thread.
const zstbi = @import("zstbi");
zstbi.init(allocator);
defer zstbi.deinit();
pub const Image = struct {
data: []u8,
width: u32,
height: u32,
num_components: u32,
bytes_per_component: u32,
bytes_per_row: u32,
is_hdr: bool,
...
pub fn loadFromFile(pathname: [:0]const u8, forced_num_components: u32) !Image
pub fn loadFromMemory(data: []const u8, forced_num_components: u32) !Image
pub fn createEmpty(width: u32, height: u32, num_components: u32, args: struct {
bytes_per_component: u32 = 0,
bytes_per_row: u32 = 0,
}) !Image
pub fn info(pathname: [:0]const u8) struct {
is_supported: bool,
width: u32,
height: u32,
num_components: u32,
}
pub fn resize(image: *const Image, new_width: u32, new_height: u32) Image
pub fn writeToFile(
image: *const Image,
filename: [:0]const u8,
image_format: ImageWriteFormat,
) ImageWriteError!void
pub fn writeToFn(
image: *const Image,
write_fn: *const fn (ctx: ?*anyopaque, data: ?*anyopaque, size: c_int) callconv(.C) void,
context: ?*anyopaque,
image_format: ImageWriteFormat,
) ImageWriteError!void
var image = try zstbi.Image.loadFromFile("data/image.png", forced_num_components);
defer image.deinit();
const new_resized_image = image.resize(1024, 1024);
Misc functions:
pub fn isHdr(filename: [:0]const u8) bool
pub fn is16bit(filename: [:0]const u8) bool
pub fn setFlipVerticallyOnLoad(should_flip: bool) void