Windows 1.0 Icon - Revision history

Jsummers at 22:02, 4 June 2017

2017-06-04T22:02:29Z

John e at 21:22, 7 April 2017

2017-04-07T21:22:52Z

John e: Created page with "{{FormatInfo |formattype=electronic |subcat=Graphics |extensions={{ext|ico}} }} The Windows 1.x variant of the '''ICO''' format is used in Microsoft Windows versions 1 and 2 t..."

2017-04-07T21:21:44Z

Created page with "{{FormatInfo |formattype=electronic |subcat=Graphics |extensions={{ext|ico}} }} The Windows 1.x variant of the '''ICO''' format is used in Microsoft Windows versions 1 and 2 t..."

New page

{{FormatInfo
|formattype=electronic
|subcat=Graphics
|extensions={{ext|ico}}
}}
The Windows 1.x variant of the '''ICO''' format is used in Microsoft Windows versions 1 and 2 to define monochrome icons. It has little in common with the [[ICO]] format used by Windows 3 and above.

== Format ==
Files begin with a little-endian word, which is one of:
{| class="wikitable"
! Value
! Meaning
|-
| 0001 || Device-Independent Format
|-
| 0101 || Device-Dependent Format
|-
| 0201 || Both formats
|}

This is followed by a 12-byte header describing the icon bitmap:
{| class="wikitable"
! Offset
! Type
! Meaning
|-
| 0000 || DWORD || Not used (corresponds to hot spot X/Y in the [[Windows_1.0_Cursor]] format).
|-
| 0004 || WORD || Width of bitmap in pixels
|-
| 0006 || WORD || Height of bitmap in pixels
|-
| 0008 || WORD || Width of bitmap in bytes
|-
| 000A || WORD || Not used (corresponds to cursor color in the [[Windows_1.0_Cursor]] format).
|-
|}
Two bitmaps come after the header, each <code>csHeight</code> * <code>csWidthBytes</code> bytes long. The first bitmap is ANDed with the screen pattern; then the second is XORed on top of it.

A file in 'device independent' format is stored at double its eventual size (so a 32×32 icon would be saved as a 64×64 bitmap). A file in 'Both formats' format contains the header and bitmaps for the 'device-independent' version of the bitmap, followed by the header and bitmaps for the 'device-dependent' version.

== See also ==
* [[Windows_1.0_Cursor]]
* [[ICO]]

== Sample files ==
* Samples can be found in the Windows 2.x DDK, or generated with the Windows 1.x / 2.x icon editor ICONEDIT.

[[Category:Microsoft]]
[[Category:Windows]]

@@ Line 36: / Line 36: @@
 |-
 |}
-Two bitmaps come after the header, each <code>csHeight</code> * <code>csWidthBytes</code> bytes long. The first bitmap is ANDed with the screen pattern; then the second is XORed on top of it.
+Two bitmaps come after the header, each <code>csHeight</code> * <code>csWidthBytes</code> bytes long. The first bitmap is ANDed with the screen pattern; then the second is [[Exclusive Or|XORed]] on top of it.
 A file in 'device independent' format is stored at double its eventual size (so a 32&times;32 icon would be saved as a 64&times;64 bitmap). A file in 'Both formats' format contains the header and bitmaps for the 'device-independent' version of the bitmap, followed by the header and bitmaps for the 'device-dependent' version.

@@ Line 41: / Line 41: @@
 == See also ==
-* [[Windows_1.0_Cursor]]
+* [[Windows 1.0 Cursor]]
 * [[ICO]]