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/*
* Copyright 2009, Google Inc.
* 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "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 COPYRIGHT
* OWNER OR CONTRIBUTORS 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.
*/
// This file contains the image file codec operations for OpenGL texture
// loading.
#include <stdio.h>
#include "core/cross/bitmap.h"
#include "utils/cross/file_path_utils.h"
#include "base/file_path.h"
#include "base/file_util.h"
#include "import/cross/memory_buffer.h"
#include "import/cross/memory_stream.h"
using file_util::OpenFile;
using file_util::CloseFile;
namespace o3d {
// Loads the header information and raw RGB{A} data from an uncompressed
// 24-bit or 32-bit TGA stream into the Bitmap object.
bool Bitmap::LoadFromTGAStream(ServiceLocator* service_locator,
MemoryReadStream *stream,
const String &filename,
BitmapRefArray* bitmaps) {
// Read the magic header.
uint8 file_magic[12];
if (stream->Read(file_magic, sizeof(file_magic)) != sizeof(file_magic)) {
DLOG(ERROR) << "Targa file magic not loaded \"" << filename << "\"";
return false;
}
// Match the first few bytes of the TGA header to confirm we can read this
// format. Multibyte values are stored little endian.
static const uint8 kTargaMagic[12] = {
0, // ID Length (0 = no ID string present)
0, // Color Map Type ( 0 = no color map)
2, // Image Type (2 = Uncompressed True Color)
0, 0, // Color Map: First Entry Index (2 bytes)
0, 0, // Color Map: Table Length (2 bytes)
0, // Color Map: Entry Size
0, 0, // X-origin of image
0, 0, // Y-origin of image
// MATCHED LATER: Image Width (2 bytes)
// MATCHED LATER: Image Height (2 bytes)
// MATCHED LATER: Pixel Depth (1 byte)
// MATCHED LATER: Image Descriptor (1 byte, alpha:4bit, origin:2bit)
};
// TODO(gman): The most common targa format is compressed! We should support
// that format or remove targa support completely. If we are keeping targa
// format we should also support grayscale, 8bit indexed and 16bit formats.
if (memcmp(kTargaMagic, file_magic, sizeof(kTargaMagic)) != 0) {
DLOG(ERROR) << "Targa file subtype not recognized \"" << filename << "\"";
return false;
}
// Read the image header.
uint8 header[6];
if (stream->Read(header, sizeof(header)) != sizeof(header)) {
DLOG(ERROR) << "Targa file header not read \"" << filename << "\"";
return false;
}
// Calculate image width and height, stored as little endian.
unsigned int tga_width = header[1] * 256 + header[0];
unsigned int tga_height = header[3] * 256 + header[2];
if (!image::CheckImageDimensions(tga_width, tga_height)) {
DLOG(ERROR) << "Failed to load " << filename
<< ": dimensions are too large (" << tga_width
<< ", " << tga_height << ").";
return false;
}
unsigned int components = header[4] >> 3;
// NOTE: Image Descriptor byte is skipped.
if (components != 3 && components != 4) {
DLOG(ERROR) << "Targa file \"" << filename
<< "\"has an unsupported number of components";
return false;
}
// pixels contained in the file.
unsigned int pixel_count = tga_width * tga_height;
// Allocate storage for the pixels.
Texture::Format format = components == 3 ? Texture::XRGB8 : Texture::ARGB8;
// Allocate storage for the pixels. Bitmap requires we allocate enough
// memory for all mips even if we don't use them.
size_t image_size = Bitmap::ComputeMaxSize(tga_width, tga_height, format);
scoped_array<uint8> image_data(new uint8[image_size]);
if (image_data.get() == NULL) {
DLOG(ERROR) << "Targa file memory allocation error \"" << filename << "\"";
return false;
}
// Read in the bitmap data.
size_t bytes_to_read = pixel_count * components;
if (stream->Read(image_data.get(), bytes_to_read) != bytes_to_read) {
DLOG(ERROR) << "Targa file read failed \"" << filename << "\"";
return false;
}
if (components == 3) {
// Fixup the image by inserting an alpha value of 1 (BGR->BGRX).
image::XYZToXYZA(image_data.get(), pixel_count);
}
// Success.
Bitmap::Ref bitmap(new Bitmap(service_locator));
bitmap->SetContents(format, 1, tga_width, tga_height, IMAGE, &image_data);
bitmaps->push_back(bitmap);
// Targas are generally bottom first in memory so flip it.
//
// TODO(gman): In truth a targa can be any orientation. We should check
// that orientation and flip or not flip accordingly.
bitmap->FlipVertically();
return true;
}
} // namespace o3d
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