aboutsummaryrefslogtreecommitdiff
path: root/image/tga.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'image/tga.cpp')
-rw-r--r--image/tga.cpp430
1 files changed, 430 insertions, 0 deletions
diff --git a/image/tga.cpp b/image/tga.cpp
new file mode 100644
index 0000000000..e251f64677
--- /dev/null
+++ b/image/tga.cpp
@@ -0,0 +1,430 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+/* Based on code from xoreos https://github.com/DrMcCoy/xoreos/
+ * relicensed under GPLv2+ with permission from DrMcCoy and clone2727
+ */
+
+#include "image/tga.h"
+
+#include "common/util.h"
+#include "common/stream.h"
+#include "common/textconsole.h"
+#include "common/error.h"
+
+namespace Image {
+
+TGADecoder::TGADecoder() {
+ _colorMapSize = 0;
+ _colorMapOrigin = 0;
+ _colorMapLength = 0;
+ _colorMapEntryLength = 0;
+ _colorMap = NULL;
+}
+
+TGADecoder::~TGADecoder() {
+ destroy();
+}
+
+void TGADecoder::destroy() {
+ _surface.free();
+ delete[] _colorMap;
+}
+
+bool TGADecoder::loadStream(Common::SeekableReadStream &tga) {
+ destroy();
+
+ byte imageType, pixelDepth;
+ bool success;
+ success = readHeader(tga, imageType, pixelDepth);
+ if (success) {
+ switch (imageType) {
+ case TYPE_BW:
+ case TYPE_TRUECOLOR:
+ success = readData(tga, imageType, pixelDepth);
+ break;
+ case TYPE_RLE_BW:
+ case TYPE_RLE_TRUECOLOR:
+ case TYPE_RLE_CMAP:
+ success = readDataRLE(tga, imageType, pixelDepth);
+ break;
+ case TYPE_CMAP:
+ success = readDataColorMapped(tga, imageType, pixelDepth);
+ break;
+ default:
+ success = false;
+ break;
+ }
+ }
+ if (tga.err() || !success) {
+ warning("Failed reading TGA-file");
+ return false;
+ }
+ return success;
+}
+
+bool TGADecoder::readHeader(Common::SeekableReadStream &tga, byte &imageType, byte &pixelDepth) {
+ if (!tga.seek(0)) {
+ warning("Failed reading TGA-file");
+ return false;
+ }
+
+ // TGAs have an optional "id" string in the header
+ uint32 idLength = tga.readByte();
+
+ // Number of colors in the color map / palette
+ int hasColorMap = tga.readByte();
+
+ // Image type. See header for numeric constants
+ imageType = tga.readByte();
+
+ switch (imageType) {
+ case TYPE_CMAP:
+ case TYPE_TRUECOLOR:
+ case TYPE_BW:
+ case TYPE_RLE_CMAP:
+ case TYPE_RLE_TRUECOLOR:
+ case TYPE_RLE_BW:
+ break;
+ default:
+ warning("Unsupported image type: %d", imageType);
+ return false;
+ }
+
+ // Color map specifications
+ if (hasColorMap == 0) {
+ tga.skip(5);
+ } else {
+ _colorMapOrigin = tga.readUint16LE();
+ _colorMapLength = tga.readUint16LE();
+ _colorMapEntryLength = tga.readByte();
+ }
+ // Origin-defintions
+ tga.skip(2 + 2);
+
+ // Image dimensions
+ _surface.w = tga.readUint16LE();
+ _surface.h = tga.readUint16LE();
+
+ // Bits per pixel
+ pixelDepth = tga.readByte();
+ _surface.format.bytesPerPixel = pixelDepth / 8;
+
+ // Image descriptor
+ byte imgDesc = tga.readByte();
+ int attributeBits = imgDesc & 0x0F;
+ assert((imgDesc & 0x10) == 0);
+ _originTop = (imgDesc & 0x20);
+
+ // Interleaving is not handled at this point
+ //int interleave = (imgDesc & 0xC);
+ if (imageType == TYPE_CMAP || imageType == TYPE_RLE_CMAP) {
+ if (pixelDepth == 8) {
+ _format = Graphics::PixelFormat::createFormatCLUT8();
+ } else {
+ warning("Unsupported index-depth: %d", pixelDepth);
+ return false;
+ }
+ } else if (imageType == TYPE_TRUECOLOR || imageType == TYPE_RLE_TRUECOLOR) {
+ if (pixelDepth == 24) {
+ _format = Graphics::PixelFormat(3, 8, 8, 8, 0, 16, 8, 0, 0);
+ } else if (pixelDepth == 32) {
+ // HACK: According to the spec, attributeBits should determine the amount
+ // of alpha-bits, however, as the game files that use this decoder seems
+ // to ignore that fact, we force the amount to 8 for 32bpp files for now.
+ _format = Graphics::PixelFormat(4, 8, 8, 8, /* attributeBits */ 8, 16, 8, 0, 24);
+ } else if (pixelDepth == 16 && imageType == TYPE_TRUECOLOR) {
+ // 16bpp TGA is ARGB1555
+ _format = Graphics::PixelFormat(2, 5, 5, 5, attributeBits, 10, 5, 0, 15);
+ } else {
+ warning("Unsupported pixel depth: %d, %d", imageType, pixelDepth);
+ return false;
+ }
+ } else if (imageType == TYPE_BW || TYPE_RLE_BW) {
+ if (pixelDepth == 8) {
+ _format = Graphics::PixelFormat(4, 8, 8, 8, 0, 16, 8, 0, 0);
+ } else {
+ warning("Unsupported pixel depth: %d, %d", imageType, pixelDepth);
+ return false;
+ }
+
+ } else {
+ warning("Unsupported image type: %d", imageType);
+ return false;
+ }
+
+ // Skip the id string
+ tga.skip(idLength);
+
+ if (hasColorMap) {
+ return readColorMap(tga, imageType, pixelDepth);
+ }
+ return true;
+}
+
+bool TGADecoder::readColorMap(Common::SeekableReadStream &tga, byte imageType, byte pixelDepth) {
+ _colorMap = new byte[3 * _colorMapLength];
+ for (int i = 0; i < _colorMapLength * 3; i += 3) {
+ byte r, g, b;
+ if (_colorMapEntryLength == 32) {
+ byte a;
+ Graphics::PixelFormat format(4, 8, 8, 8, 0, 16, 8, 0, 24);
+ uint32 color = tga.readUint32LE();
+ format.colorToARGB(color, a, r, g, b);
+ } else if (_colorMapEntryLength == 24) {
+ r = tga.readByte();
+ g = tga.readByte();
+ b = tga.readByte();
+ } else if (_colorMapEntryLength == 16) {
+ byte a;
+ Graphics::PixelFormat format(2, 5, 5, 5, 0, 10, 5, 0, 15);
+ uint16 color = tga.readUint16LE();
+ format.colorToARGB(color, a, r, g, b);
+ } else {
+ warning("Unsupported image type: %d", imageType);
+ r = g = b = 0;
+ }
+#ifdef SCUMM_LITTLE_ENDIAN
+ _colorMap[i] = r;
+ _colorMap[i + 1] = g;
+ _colorMap[i + 2] = b;
+#else
+ _colorMap[i] = b;
+ _colorMap[i + 1] = g;
+ _colorMap[i + 2] = r;
+#endif
+ }
+ return true;
+}
+
+// Additional information found from http://paulbourke.net/dataformats/tga/
+// With some details from the link referenced in the header.
+bool TGADecoder::readData(Common::SeekableReadStream &tga, byte imageType, byte pixelDepth) {
+ // TrueColor
+ if (imageType == TYPE_TRUECOLOR) {
+ _surface.create(_surface.w, _surface.h, _format);
+
+ if (pixelDepth == 16) {
+ for (int i = 0; i < _surface.h; i++) {
+ uint16 *dst;
+ if (!_originTop) {
+ dst = (uint16 *)_surface.getBasePtr(0, _surface.h - i - 1);
+ } else {
+ dst = (uint16 *)_surface.getBasePtr(0, i);
+ }
+ for (int j = 0; j < _surface.w; j++) {
+ *dst++ = tga.readUint16LE();
+ }
+ }
+ } else if (pixelDepth == 32) {
+ for (int i = 0; i < _surface.h; i++) {
+ uint32 *dst;
+ if (!_originTop) {
+ dst = (uint32 *)_surface.getBasePtr(0, _surface.h - i - 1);
+ } else {
+ dst = (uint32 *)_surface.getBasePtr(0, i);
+ }
+ for (int j = 0; j < _surface.w; j++) {
+ *dst++ = tga.readUint32LE();
+ }
+ }
+ } else if (pixelDepth == 24) {
+ for (int i = 0; i < _surface.h; i++) {
+ byte *dst;
+ if (!_originTop) {
+ dst = (byte *)_surface.getBasePtr(0, _surface.h - i - 1);
+ } else {
+ dst = (byte *)_surface.getBasePtr(0, i);
+ }
+ for (int j = 0; j < _surface.w; j++) {
+ byte r = tga.readByte();
+ byte g = tga.readByte();
+ byte b = tga.readByte();
+#ifdef SCUMM_LITTLE_ENDIAN
+ *dst++ = r;
+ *dst++ = g;
+ *dst++ = b;
+#else
+ *dst++ = b;
+ *dst++ = g;
+ *dst++ = r;
+#endif
+ }
+ }
+ }
+ // Black/White
+ } else if (imageType == TYPE_BW) {
+ _surface.create(_surface.w, _surface.h, _format);
+
+ byte *data = (byte *)_surface.getPixels();
+ uint32 count = _surface.w * _surface.h;
+
+ while (count-- > 0) {
+ byte g = tga.readByte();
+ *data++ = g;
+ *data++ = g;
+ *data++ = g;
+ *data++ = g;
+ }
+ }
+ return true;
+}
+
+bool TGADecoder::readDataColorMapped(Common::SeekableReadStream &tga, byte imageType, byte indexDepth) {
+ // Color-mapped
+ if (imageType == TYPE_CMAP) {
+ _surface.create(_surface.w, _surface.h, _format);
+ if (indexDepth == 8) {
+ for (int i = 0; i < _surface.h; i++) {
+ byte *dst;
+ if (!_originTop) {
+ dst = (byte *)_surface.getBasePtr(0, _surface.h - i - 1);
+ } else {
+ dst = (byte *)_surface.getBasePtr(0, i);
+ }
+ for (int j = 0; j < _surface.w; j++) {
+ byte index = tga.readByte();
+ *dst++ = index;
+ }
+ }
+ } else if (indexDepth == 16) {
+ warning("16 bit indexes not supported");
+ return false;
+ }
+ } else {
+ return false;
+ }
+ return true;
+}
+
+bool TGADecoder::readDataRLE(Common::SeekableReadStream &tga, byte imageType, byte pixelDepth) {
+ // RLE-TrueColor / RLE-Black/White
+ if (imageType == TYPE_RLE_TRUECOLOR || imageType == TYPE_RLE_BW || imageType == TYPE_RLE_CMAP) {
+ _surface.create(_surface.w, _surface.h, _format);
+ uint32 count = _surface.w * _surface.h;
+ byte *data = (byte *)_surface.getPixels();
+
+ while (count > 0) {
+ uint32 header = tga.readByte();
+ byte type = (header & 0x80) >> 7;
+ uint32 rleCount = (header & 0x7F) + 1;
+
+ // RLE-packet
+ if (type == 1) {
+ if (pixelDepth == 32 && imageType == TYPE_RLE_TRUECOLOR) {
+ uint32 color = tga.readUint32LE();
+ while (rleCount-- > 0) {
+ *((uint32 *)data) = color;
+ data += 4;
+ count--;
+ }
+ } else if (pixelDepth == 24 && imageType == TYPE_RLE_TRUECOLOR) {
+ byte r = tga.readByte();
+ byte g = tga.readByte();
+ byte b = tga.readByte();
+ while (rleCount-- > 0) {
+#ifdef SCUMM_LITTLE_ENDIAN
+ *data++ = r;
+ *data++ = g;
+ *data++ = b;
+#else
+ *data++ = b;
+ *data++ = g;
+ *data++ = r;
+#endif
+ count--;
+ }
+ } else if (pixelDepth == 8 && imageType == TYPE_RLE_BW) {
+ byte color = tga.readByte();
+ while (rleCount-- > 0) {
+ *data++ = color;
+ *data++ = color;
+ *data++ = color;
+ *data++ = color;
+ count--;
+ }
+ } else if (pixelDepth == 8 && imageType == TYPE_RLE_CMAP) {
+ byte index = tga.readByte();
+ while (rleCount-- > 0) {
+ *data++ = index;
+ count--;
+ }
+ } else {
+ warning("Unhandled pixel-depth for image-type 10");
+ return false;
+ }
+ // Raw-packet
+ } else if (type == 0) {
+ if (pixelDepth == 32 && imageType == TYPE_RLE_TRUECOLOR) {
+ while (rleCount-- > 0) {
+ uint32 color = tga.readUint32LE();
+ *((uint32 *)data) = color;
+ data += 4;
+ count--;
+ }
+ } else if (pixelDepth == 24 && imageType == TYPE_RLE_TRUECOLOR) {
+ while (rleCount-- > 0) {
+ byte r = tga.readByte();
+ byte g = tga.readByte();
+ byte b = tga.readByte();
+#ifdef SCUMM_LITTLE_ENDIAN
+ *data++ = r;
+ *data++ = g;
+ *data++ = b;
+#else
+ *data++ = b;
+ *data++ = g;
+ *data++ = r;
+#endif
+ count--;
+ }
+ } else if (pixelDepth == 8 && imageType == TYPE_RLE_BW) {
+ while (rleCount-- > 0) {
+ byte color = tga.readByte();
+ *data++ = color;
+ *data++ = color;
+ *data++ = color;
+ *data++ = color;
+ count--;
+ }
+ } else if (pixelDepth == 8 && imageType == TYPE_RLE_CMAP) {
+ while (rleCount-- > 0) {
+ byte index = tga.readByte();
+ *data++ = index;
+ count--;
+ }
+ } else {
+ warning("Unhandled pixel-depth for image-type 10");
+ return false;
+ }
+ } else {
+ warning("Unknown header for RLE-packet %d", type);
+ return false;
+ }
+ }
+ } else {
+ return false;
+ }
+ return true;
+}
+
+} // End of namespace Image
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 23:44:04 +0000