Index: uspace/lib/gfximage/src/tga.c
===================================================================
--- uspace/lib/gfximage/src/tga.c	(revision 0576df9c3cf6dea4ee0796c50c76680c8fafcad7)
+++ uspace/lib/gfximage/src/tga.c	(revision 0576df9c3cf6dea4ee0796c50c76680c8fafcad7)
@@ -0,0 +1,284 @@
+/*
+ * Copyright (c) 2011 Martin Decky
+ * Copyright (c) 2011 Petr Koupy
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup draw
+ * @{
+ */
+/**
+ * @file
+ */
+
+#include <stdlib.h>
+#include <byteorder.h>
+#include <align.h>
+#include <stdbool.h>
+#include <pixconv.h>
+#include <gfx/bitmap.h>
+#include <gfximage/tga.h>
+#include <io/pixelmap.h>
+
+typedef struct {
+	uint8_t id_length;
+	uint8_t cmap_type;
+	uint8_t img_type;
+
+	uint16_t cmap_first_entry;
+	uint16_t cmap_entries;
+	uint8_t cmap_bpp;
+
+	uint16_t startx;
+	uint16_t starty;
+	uint16_t width;
+	uint16_t height;
+	uint8_t img_bpp;
+	uint8_t img_descr;
+} __attribute__((packed)) tga_header_t;
+
+typedef enum {
+	CMAP_NOT_PRESENT = 0,
+	CMAP_PRESENT = 1,
+	CMAP_RESERVED_START = 2,
+	CMAP_PRIVATE_START = 128
+} cmap_type_t;
+
+typedef enum {
+	IMG_EMTPY = 0,
+	IMG_CMAP = 1,
+	IMG_BGRA = 2,
+	IMG_GRAY = 3,
+	IMG_CMAP_RLE = 9,
+	IMG_BGRA_RLE = 10,
+	IMG_GRAY_RLE = 11
+} img_type_t;
+
+typedef struct {
+	cmap_type_t cmap_type;
+	img_type_t img_type;
+
+	uint16_t cmap_first_entry;
+	uint16_t cmap_entries;
+	uint8_t cmap_bpp;
+
+	uint16_t startx;
+	uint16_t starty;
+	uint16_t width;
+	uint16_t height;
+	uint8_t img_bpp;
+	uint8_t img_alpha_bpp;
+	uint8_t img_alpha_dir;
+
+	void *id_data;
+	size_t id_length;
+
+	void *cmap_data;
+	size_t cmap_length;
+
+	void *img_data;
+	size_t img_length;
+} tga_t;
+
+/** Decode Truevision TGA header
+ *
+ * @param[in]  data Memory representation of TGA.
+ * @param[in]  size Size of the representation (in bytes).
+ * @param[out] tga  Decoded TGA.
+ *
+ * @return True on succesful decoding.
+ * @return False on failure.
+ *
+ */
+static bool decode_tga_header(void *data, size_t size, tga_t *tga)
+{
+	/* Header sanity check */
+	if (size < sizeof(tga_header_t))
+		return false;
+
+	tga_header_t *head = (tga_header_t *) data;
+
+	/* Image ID field */
+	tga->id_data = data + sizeof(tga_header_t);
+	tga->id_length = head->id_length;
+
+	if (size < sizeof(tga_header_t) + tga->id_length)
+		return false;
+
+	/* Color map type */
+	tga->cmap_type = head->cmap_type;
+
+	/* Image type */
+	tga->img_type = head->img_type;
+
+	/* Color map specification */
+	tga->cmap_first_entry = uint16_t_le2host(head->cmap_first_entry);
+	tga->cmap_entries = uint16_t_le2host(head->cmap_entries);
+	tga->cmap_bpp = head->cmap_bpp;
+	tga->cmap_data = tga->id_data + tga->id_length;
+	tga->cmap_length = ALIGN_UP(tga->cmap_entries * tga->cmap_bpp, 8) >> 3;
+
+	if (size < sizeof(tga_header_t) + tga->id_length +
+	    tga->cmap_length)
+		return false;
+
+	/* Image specification */
+	tga->startx = uint16_t_le2host(head->startx);
+	tga->starty = uint16_t_le2host(head->starty);
+	tga->width = uint16_t_le2host(head->width);
+	tga->height = uint16_t_le2host(head->height);
+	tga->img_bpp = head->img_bpp;
+	tga->img_alpha_bpp = head->img_descr & 0x0f;
+	tga->img_alpha_dir = (head->img_descr & 0xf0) >> 4;
+	tga->img_data = tga->cmap_data + tga->cmap_length;
+	tga->img_length = ALIGN_UP(tga->width * tga->height * tga->img_bpp, 8) >> 3;
+
+	if (size < sizeof(tga_header_t) + tga->id_length +
+	    tga->cmap_length + tga->img_length)
+		return false;
+
+	return true;
+}
+
+/** Decode Truevision TGA format
+ *
+ * Decode Truevision TGA format and create a surface
+ * from it. The supported variants of TGA are currently
+ * limited to uncompressed 24 bit true-color images without
+ * alpha channel.
+ *
+ * @param gc      Graphic context
+ * @param data    Memory representation of gzipped TGA.
+ * @param size    Size of the representation (in bytes).
+ * @param rbitmap Place to store pointer to new bitmap
+ * @param rrect   Place to store bitmap rectangle
+ *
+ * @return EOK un success or an error code
+ */
+errno_t decode_tga(gfx_context_t *gc, void *data, size_t size,
+    gfx_bitmap_t **rbitmap, gfx_rect_t *rrect)
+{
+	gfx_bitmap_params_t params;
+	gfx_bitmap_alloc_t alloc;
+	gfx_bitmap_t *bitmap = NULL;
+	pixelmap_t pixelmap;
+	errno_t rc;
+
+	tga_t tga;
+	if (!decode_tga_header(data, size, &tga))
+		return EINVAL;
+
+	/*
+	 * Check for unsupported features.
+	 */
+
+	switch (tga.cmap_type) {
+	case CMAP_NOT_PRESENT:
+		break;
+	default:
+		/* Unsupported */
+		return ENOTSUP;
+	}
+
+	switch (tga.img_type) {
+	case IMG_BGRA:
+		if (tga.img_bpp != 24)
+			return ENOTSUP;
+		break;
+	case IMG_GRAY:
+		if (tga.img_bpp != 8)
+			return ENOTSUP;
+		break;
+	default:
+		/* Unsupported */
+		return ENOTSUP;
+	}
+
+	if (tga.img_alpha_bpp != 0)
+		return ENOTSUP;
+
+	sysarg_t twidth = tga.startx + tga.width;
+	sysarg_t theight = tga.starty + tga.height;
+
+	gfx_bitmap_params_init(&params);
+	params.rect.p1.x = twidth;
+	params.rect.p1.y = theight;
+
+	rc = gfx_bitmap_create(gc, &params, NULL, &bitmap);
+	if (rc != EOK)
+		return rc;
+
+	rc = gfx_bitmap_get_alloc(bitmap, &alloc);
+	if (rc != EOK) {
+		gfx_bitmap_destroy(bitmap);
+		return rc;
+	}
+
+	pixelmap.width = twidth;
+	pixelmap.height = theight;
+	pixelmap.data = alloc.pixels;
+
+	/*
+	 * TGA is encoded in a bottom-up manner, the true-color
+	 * variant is in BGR 8:8:8 encoding.
+	 */
+
+	switch (tga.img_type) {
+	case IMG_BGRA:
+		for (sysarg_t y = tga.starty; y < theight; y++) {
+			for (sysarg_t x = tga.startx; x < twidth; x++) {
+				size_t offset =
+				    ((y - tga.starty) * tga.width + (x - tga.startx)) * 3;
+
+				pixel_t pixel =
+				    bgr_888_2pixel(((uint8_t *) tga.img_data) + offset);
+				pixelmap_put_pixel(&pixelmap, x, theight - y - 1, pixel);
+			}
+		}
+		break;
+	case IMG_GRAY:
+		for (sysarg_t y = tga.starty; y < theight; y++) {
+			for (sysarg_t x = tga.startx; x < twidth; x++) {
+				size_t offset =
+				    (y - tga.starty) * tga.width + (x - tga.startx);
+
+				pixel_t pixel =
+				    gray_8_2pixel(((uint8_t *) tga.img_data) + offset);
+				pixelmap_put_pixel(&pixelmap, x, theight - y - 1, pixel);
+			}
+		}
+		break;
+	default:
+		break;
+	}
+
+	*rbitmap = bitmap;
+	*rrect = params.rect;
+	return EOK;
+}
+
+/** @}
+ */
