86 lines
2.1 KiB
Zig
86 lines
2.1 KiB
Zig
// imagemagick plugins
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const std = @import("std");
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const images = @import("image.zig");
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const log = std.log.scoped(.scritcher_magick);
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const Image = images.Image;
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const mc = @cImport({
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@cInclude("wand/magick_wand.h");
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});
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pub const MagickContext = struct {
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wand: *mc.MagickWand,
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pub fn init() !MagickContext {
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mc.InitializeMagick(null);
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var wand = mc.NewMagickWand();
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if (wand == null) return error.WandCreateFail;
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return MagickContext{
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.wand = wand.?,
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};
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}
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pub fn deinit(self: *MagickContext) void {
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_ = mc.DestroyMagickWand(self.wand);
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mc.DestroyMagick();
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}
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pub fn doErr(self: *MagickContext) !void {
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_ = self;
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return error.WandError;
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}
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};
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fn magickLoad(image: *Image) !MagickContext {
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var mctx = try MagickContext.init();
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errdefer mctx.deinit();
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var curpath = try std.cstr.addNullByte(image.allocator, image.curpath);
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defer image.allocator.free(curpath);
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log.debug("loading '{s}'", .{curpath});
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if (mc.MagickReadImage(mctx.wand, curpath.ptr) != 1)
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return error.MagickReadFail;
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return mctx;
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}
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fn magickSave(image: *Image, wand: *mc.MagickWand) !void {
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const allocator = image.allocator;
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var tmpnam = try images.temporaryName(allocator);
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var c_tmpnam = try std.cstr.addNullByte(allocator, tmpnam);
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defer allocator.free(c_tmpnam);
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log.debug("\tmagick: saving to '{s}'..", .{c_tmpnam});
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if (mc.MagickWriteImage(wand, c_tmpnam.ptr) != 1)
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return error.MagickWriteFail;
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log.debug("OK", .{});
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try image.reopen(tmpnam);
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}
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/// Rotate the given image.
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/// bgfill must point to a null-terminated string.
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pub fn runRotate(image: *Image, deg: f32, bgfill: []const u8) !void {
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var mctx = try magickLoad(image);
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defer mctx.deinit();
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var bg = mc.NewPixelWand();
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defer mc.DestroyPixelWand(bg);
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if (mc.PixelSetColor(bg, bgfill.ptr) != 1)
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return error.PixelSetColorFail;
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if (mc.MagickRotateImage(mctx.wand, bg, deg) != 1)
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return error.RotateFail;
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try magickSave(image, mctx.wand);
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}
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