package: add selection between libjpeg and jpeg-turbo

Introduce a virtual 'jpeg' package, which pulls in either libjpeg or
jpeg-turbo depending on a choice selection.

Rename jpeg package to libjpeg so we can reuse 'jpeg' for the virtual
package, making the change transparent to existing users and all the
packages using libjpeg.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>

package/jpeg/Config.in

@@ -1,6 +1,33 @@
 config BR2_PACKAGE_JPEG
+	bool "jpeg support"
+	help
+	  Select the desired JPEG library provider.
+
+if BR2_PACKAGE_JPEG
+
+choice
+	prompt "jpeg variant"
+	default BR2_PACKAGE_JPEG_TURBO if (BR2_X86_CPU_HAS_MMX || BR2_ARM_CPU_HAS_NEON)
+	help
+	  Select the older stable version, or the newer developer version
+
+config BR2_PACKAGE_LIBJPEG
 	bool "jpeg"
 	help
 	  The ubiquitous C library for manipulating JPEG images.
 
 	  http://www.ijg.org/
+
+config BR2_PACKAGE_JPEG_TURBO
+	bool "jpeg-turbo"
+	help
+	  Libjpeg-turbo is a derivative of libjpeg that uses SIMD
+	  instructions (MMX, SSE2, NEON) to accelerate baseline JPEG
+	  compression and decompression on x86, x86-64, and ARM
+	  systems.
+
+	  http://www.libjpeg-turbo.org
+
+endchoice
+
+endif

package/jpeg/jpeg.mk

@@ -1,18 +1,9 @@
 #############################################################
 #
-# jpeg (libraries needed by some apps)
+# jpeg
 #
 #############################################################
-JPEG_VERSION = 8d
-JPEG_SITE = http://www.ijg.org/files/
-JPEG_SOURCE = jpegsrc.v$(JPEG_VERSION).tar.gz
-JPEG_INSTALL_STAGING = YES
 
-define JPEG_REMOVE_USELESS_TOOLS
-	rm -f $(addprefix $(TARGET_DIR)/usr/bin/,cjpeg djpeg jpegtrans rdjpgcom wrjpgcom)
-endef
+jpeg: $(if $(BR2_PACKAGE_JPEG_TURBO),jpeg-turbo,libjpeg)
 
-JPEG_POST_INSTALL_TARGET_HOOKS += JPEG_REMOVE_USELESS_TOOLS
-
-$(eval $(autotools-package))
-$(eval $(host-autotools-package))
+host-jpeg: host-libjpeg