57 lines
1.9 KiB
Go
57 lines
1.9 KiB
Go
// +build !windows,!darwin
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// 16 august 2014
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package ui
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import (
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"fmt"
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"image"
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"unsafe"
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)
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// #include "gtk_unix.h"
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import "C"
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// this is what GtkFileChooserWidget uses
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// technically it uses max(width from that, height from that) if the call below fails and 16x16 otherwise, but we won't worry about that here (yet?)
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const scaleTo = C.GTK_ICON_SIZE_MENU
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func toIconSizedGdkPixbuf(img *image.RGBA) *C.GdkPixbuf {
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var width, height C.gint
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surface := C.cairo_image_surface_create(C.CAIRO_FORMAT_ARGB32,
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C.int(img.Rect.Dx()),
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C.int(img.Rect.Dy()))
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if status := C.cairo_surface_status(surface); status != C.CAIRO_STATUS_SUCCESS {
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panic(fmt.Errorf("cairo_create_image_surface() failed in toIconSizedGdkPixbuf(): %s\n",
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C.GoString(C.cairo_status_to_string(status))))
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}
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C.cairo_surface_flush(surface)
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toARGB(img, uintptr(unsafe.Pointer(C.cairo_image_surface_get_data(surface))),
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int(C.cairo_image_surface_get_stride(surface)), false) // not NRGBA
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C.cairo_surface_mark_dirty(surface)
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basepixbuf := C.gdk_pixbuf_get_from_surface(surface, 0, 0, C.gint(img.Rect.Dx()), C.gint(img.Rect.Dy()))
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if basepixbuf == nil {
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panic(fmt.Errorf("gdk_pixbuf_get_from_surface() failed in toIconSizedGdkPixbuf() (no reason available)"))
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}
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if C.gtk_icon_size_lookup(scaleTo, &width, &height) == C.FALSE {
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panic(fmt.Errorf("gtk_icon_size_lookup() failed in toIconSizedGdkPixbuf() (no reason available)"))
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}
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if int(width) == img.Rect.Dx() && int(height) == img.Rect.Dy() {
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// just return the base pixbuf; we're good
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C.cairo_surface_destroy(surface)
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return basepixbuf
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}
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// else scale
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pixbuf := C.gdk_pixbuf_scale_simple(basepixbuf, C.int(width), C.int(height), C.GDK_INTERP_NEAREST)
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if pixbuf == nil {
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panic(fmt.Errorf("gdk_pixbuf_scale_simple() failed in toIconSizedGdkPixbuf() (no reason available)"))
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}
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C.g_object_unref(C.gpointer(unsafe.Pointer(basepixbuf)))
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C.cairo_surface_destroy(surface)
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return pixbuf
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}
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