mirror of
https://github.com/aseprite/aseprite.git
synced 2025-03-18 16:21:07 +00:00
Fix loading some particular TGA files (multiple scanlines compressed, invalid alpha information, etc.)
This commit is contained in:
David Capello
parent
de1019342a
commit
1826d66f10
@ -1,12 +1,9 @@
|
||||
// Aseprite
|
||||
// Copyright (C) 2019 Igara Studio S.A.
|
||||
// Copyright (C) 2019-2020 Igara Studio S.A.
|
||||
// Copyright (C) 2001-2018 David Capello
|
||||
//
|
||||
// This program is distributed under the terms of
|
||||
// the End-User License Agreement for Aseprite.
|
||||
//
|
||||
// tga.c - Based on the code of Tim Gunn, Michal Mertl, Salvador
|
||||
// Eduardo Tropea and Peter Wang.
|
||||
|
||||
#ifdef HAVE_CONFIG_H
|
||||
#include "config.h"
|
||||
@ -59,150 +56,431 @@ FileFormat* CreateTgaFormat()
|
||||
return new TgaFormat;
|
||||
}
|
||||
|
||||
static void rle_tga_read8(FILE* f, uint8_t* address, int w, int type)
|
||||
{
|
||||
uint8_t* end = address + (w * (type == 1 ? 1: 2));
|
||||
uint8_t value;
|
||||
int count, g;
|
||||
int c = 0;
|
||||
namespace {
|
||||
|
||||
do {
|
||||
count = fgetc(f);
|
||||
if (count & 0x80) {
|
||||
count = (count & 0x7F) + 1;
|
||||
c += count;
|
||||
value = fgetc(f);
|
||||
while (count--) {
|
||||
if (type == 1) {
|
||||
if (address+1 < end)
|
||||
*(address++) = value;
|
||||
class TgaDecoder {
|
||||
struct Header {
|
||||
uint8_t idLength;
|
||||
uint8_t palType;
|
||||
uint8_t imageType;
|
||||
uint16_t palOrigin;
|
||||
uint16_t palLength;
|
||||
uint8_t palDepth;
|
||||
uint16_t xOrigin;
|
||||
uint16_t yOrigin;
|
||||
uint16_t width;
|
||||
uint16_t height;
|
||||
uint8_t bitsPerPixel;
|
||||
uint8_t imageDescriptor;
|
||||
};
|
||||
|
||||
enum ImageType {
|
||||
NoImage = 0,
|
||||
UncompressedIndexed = 1,
|
||||
UncompressedRgb = 2,
|
||||
UncompressedGray = 3,
|
||||
RleIndexed = 9,
|
||||
RleRgb = 10,
|
||||
RleGray = 11,
|
||||
};
|
||||
|
||||
public:
|
||||
TgaDecoder(FILE* f)
|
||||
: m_f(f)
|
||||
, m_palette(0, 0)
|
||||
, m_alphaHistogram(256) {
|
||||
readHeader();
|
||||
if (m_header.palType == 1)
|
||||
readPaletteData();
|
||||
}
|
||||
|
||||
int imageType() const { return m_header.imageType; }
|
||||
int bitsPerPixel() const { return m_header.bitsPerPixel; }
|
||||
bool hasPalette() const { return (m_header.palLength > 0); }
|
||||
const Palette& palette() const { return m_palette; }
|
||||
bool hasAlpha() const { return m_hasAlpha; }
|
||||
|
||||
bool isGray() const {
|
||||
return (m_header.imageType == UncompressedGray ||
|
||||
m_header.imageType == RleGray);
|
||||
}
|
||||
|
||||
bool validPalType() const {
|
||||
return
|
||||
// Indexed with palette
|
||||
((m_header.imageType == UncompressedIndexed || m_header.imageType == RleIndexed) &&
|
||||
m_header.bitsPerPixel == 8 &&
|
||||
m_header.palType == 1) ||
|
||||
// Grayscale without palette
|
||||
((m_header.imageType == UncompressedGray || m_header.imageType == RleGray) &&
|
||||
m_header.bitsPerPixel == 8 &&
|
||||
m_header.palType == 0) ||
|
||||
// Non-indexed without palette
|
||||
(m_header.bitsPerPixel > 8 &&
|
||||
m_header.palType == 0);
|
||||
}
|
||||
|
||||
bool getImageSpec(ImageSpec& spec) const {
|
||||
switch (m_header.imageType) {
|
||||
|
||||
case UncompressedIndexed:
|
||||
case RleIndexed:
|
||||
if (m_header.bitsPerPixel != 8)
|
||||
return false;
|
||||
spec = ImageSpec(ColorMode::INDEXED,
|
||||
m_header.width,
|
||||
m_header.height);
|
||||
return true;
|
||||
|
||||
case UncompressedRgb:
|
||||
case RleRgb:
|
||||
if (m_header.bitsPerPixel != 15 &&
|
||||
m_header.bitsPerPixel != 16 &&
|
||||
m_header.bitsPerPixel != 24 &&
|
||||
m_header.bitsPerPixel != 32)
|
||||
return false;
|
||||
spec = ImageSpec(ColorMode::RGB,
|
||||
m_header.width,
|
||||
m_header.height);
|
||||
return true;
|
||||
|
||||
case UncompressedGray:
|
||||
case RleGray:
|
||||
if (m_header.bitsPerPixel != 8)
|
||||
return false;
|
||||
spec = ImageSpec(ColorMode::GRAYSCALE,
|
||||
m_header.width,
|
||||
m_header.height);
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
bool readImageData(FileOp* fop, Image* image) {
|
||||
// Bit 4 means right-to-left, else left-to-right
|
||||
// Bit 5 means top-to-bottom, else bottom-to-top
|
||||
m_iterator = ImageDataIterator(
|
||||
image,
|
||||
(m_header.imageDescriptor & 0x10) ? false: true,
|
||||
(m_header.imageDescriptor & 0x20) ? true: false,
|
||||
m_header.width,
|
||||
m_header.height);
|
||||
|
||||
for (int y=0; y<m_header.height; ++y) {
|
||||
switch (m_header.imageType) {
|
||||
|
||||
case UncompressedIndexed:
|
||||
ASSERT(m_header.bitsPerPixel == 8);
|
||||
if (readUncompressedData<uint8_t>(&TgaDecoder::fget8_as_index))
|
||||
return true;
|
||||
break;
|
||||
|
||||
case UncompressedRgb:
|
||||
switch (m_header.bitsPerPixel) {
|
||||
case 15:
|
||||
case 16:
|
||||
if (readUncompressedData<uint32_t>(&TgaDecoder::fget16_as_rgba))
|
||||
return true;
|
||||
break;
|
||||
case 24:
|
||||
if (readUncompressedData<uint32_t>(&TgaDecoder::fget24_as_rgba))
|
||||
return true;
|
||||
break;
|
||||
case 32:
|
||||
if (readUncompressedData<uint32_t>(&TgaDecoder::fget32_as_rgba))
|
||||
return true;
|
||||
break;
|
||||
default:
|
||||
ASSERT(false);
|
||||
break;
|
||||
}
|
||||
break;
|
||||
|
||||
case UncompressedGray:
|
||||
ASSERT(m_header.bitsPerPixel == 8);
|
||||
if (readUncompressedData<uint16_t>(&TgaDecoder::fget8_as_gray))
|
||||
return true;
|
||||
break;
|
||||
|
||||
case RleIndexed:
|
||||
ASSERT(m_header.bitsPerPixel == 8);
|
||||
if (readRleData<uint8_t>(&TgaDecoder::fget8_as_gray))
|
||||
return true;
|
||||
break;
|
||||
|
||||
case RleRgb:
|
||||
switch (m_header.bitsPerPixel) {
|
||||
case 15:
|
||||
case 16:
|
||||
if (readRleData<uint32_t>(&TgaDecoder::fget16_as_rgba))
|
||||
return true;
|
||||
break;
|
||||
case 24:
|
||||
if (readRleData<uint32_t>(&TgaDecoder::fget24_as_rgba))
|
||||
return true;
|
||||
break;
|
||||
case 32:
|
||||
if (readRleData<uint32_t>(&TgaDecoder::fget32_as_rgba))
|
||||
return true;
|
||||
break;
|
||||
default:
|
||||
ASSERT(false);
|
||||
break;
|
||||
}
|
||||
break;
|
||||
|
||||
case RleGray:
|
||||
ASSERT(m_header.bitsPerPixel == 8);
|
||||
if (readRleData<uint16_t>(&TgaDecoder::fget8_as_gray))
|
||||
return true;
|
||||
break;
|
||||
}
|
||||
fop->setProgress(float(y) / float(m_header.height));
|
||||
if (fop->isStop())
|
||||
break;
|
||||
}
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
// Fix alpha channel for images with invalid alpha channel values
|
||||
void postProcessImageData(Image* image) {
|
||||
if (image->colorMode() != ColorMode::RGB ||
|
||||
!m_hasAlpha)
|
||||
return;
|
||||
|
||||
int count = 0;
|
||||
for (int i=0; i<256; ++i)
|
||||
if (m_alphaHistogram[i] > 0)
|
||||
++count;
|
||||
|
||||
// If all pixels are transparent (alpha=0), make all pixels opaque
|
||||
// (alpha=255).
|
||||
if (count == 1 && m_alphaHistogram[0] > 0) {
|
||||
LockImageBits<RgbTraits> bits(image);
|
||||
auto it = bits.begin(), end = bits.end();
|
||||
for (; it != end; ++it) {
|
||||
color_t c = *it;
|
||||
*it = rgba(rgba_getr(c),
|
||||
rgba_getg(c),
|
||||
rgba_getb(c), 255);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
private:
|
||||
class ImageDataIterator {
|
||||
public:
|
||||
ImageDataIterator() { }
|
||||
|
||||
ImageDataIterator(Image* image,
|
||||
bool leftToRight,
|
||||
bool topToBottom,
|
||||
int w, int h) {
|
||||
m_image = image;
|
||||
m_w = w;
|
||||
m_h = h;
|
||||
m_x = (leftToRight ? 0: w-1);
|
||||
m_y = (topToBottom ? 0: h-1);
|
||||
m_dx = (leftToRight ? +1: -1);
|
||||
m_dy = (topToBottom ? +1: -1);
|
||||
calcPtr();
|
||||
}
|
||||
|
||||
template<typename T>
|
||||
bool next(const T value) {
|
||||
*((T*)m_ptr) = value;
|
||||
|
||||
m_x += m_dx;
|
||||
m_ptr += m_dx*sizeof(T);
|
||||
|
||||
if ((m_dx < 0 && m_x < 0) ||
|
||||
(m_dx > 0 && m_x == m_w)) {
|
||||
m_x = (m_dx > 0 ? 0: m_w-1);
|
||||
m_y += m_dy;
|
||||
if ((m_dy < 0 && m_y < 0) ||
|
||||
(m_dy > 0 && m_y == m_h)) {
|
||||
return true;
|
||||
}
|
||||
else {
|
||||
if (address+2 < end)
|
||||
*((uint16_t*)address) = graya(value, 255);
|
||||
address += 2;
|
||||
calcPtr();
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
private:
|
||||
void calcPtr() {
|
||||
m_ptr = m_image->getPixelAddress(m_x, m_y);
|
||||
}
|
||||
|
||||
Image* m_image;
|
||||
int m_x, m_y;
|
||||
int m_w, m_h;
|
||||
int m_dx, m_dy;
|
||||
uint8_t* m_ptr;
|
||||
};
|
||||
|
||||
void readHeader() {
|
||||
m_header.idLength = fgetc(m_f);
|
||||
m_header.palType = fgetc(m_f);
|
||||
m_header.imageType = fgetc(m_f);
|
||||
m_header.palOrigin = fgetw(m_f);
|
||||
m_header.palLength = fgetw(m_f);
|
||||
m_header.palDepth = fgetc(m_f);
|
||||
m_header.xOrigin = fgetw(m_f);
|
||||
m_header.yOrigin = fgetw(m_f);
|
||||
m_header.width = fgetw(m_f);
|
||||
m_header.height = fgetw(m_f);
|
||||
m_header.bitsPerPixel = fgetc(m_f);
|
||||
m_header.imageDescriptor = fgetc(m_f);
|
||||
|
||||
char imageId[256];
|
||||
if (m_header.idLength > 0)
|
||||
fread(imageId, 1, m_header.idLength, m_f);
|
||||
|
||||
#if 0
|
||||
// In the best case the "alphaBits" should be valid, but there are
|
||||
// invalid TGA files out there which don't indicate the
|
||||
// "alphaBits" correctly, so they could be 0 and use the alpha
|
||||
// channel anyway on each pixel.
|
||||
int alphaBits = (m_header.imageDescriptor & 15);
|
||||
TRACEARGS("TGA: bitsPerPixel", (int)m_header.bitsPerPixel,
|
||||
"alphaBits", alphaBits);
|
||||
m_hasAlpha =
|
||||
(m_header.bitsPerPixel == 32 && alphaBits == 8) ||
|
||||
(m_header.bitsPerPixel == 16 && alphaBits == 1);
|
||||
#else
|
||||
// So to detect if a 32bpp or 16bpp TGA image has alpha, we'll use
|
||||
// the "m_alphaHistogram" to check if there are different alpha
|
||||
// values. If there is only one alpha value (all 0 or all 255),
|
||||
// we create an opaque image anyway.
|
||||
m_hasAlpha =
|
||||
(m_header.bitsPerPixel == 32) ||
|
||||
(m_header.bitsPerPixel == 16);
|
||||
#endif
|
||||
}
|
||||
|
||||
void readPaletteData() {
|
||||
m_palette.resize(m_header.palLength);
|
||||
|
||||
for (int i=0; i<m_header.palLength; ++i) {
|
||||
switch (m_header.palDepth) {
|
||||
|
||||
case 15:
|
||||
case 16: {
|
||||
const int c = fgetw(m_f);
|
||||
m_palette.setEntry(
|
||||
i,
|
||||
doc::rgba(scale_5bits_to_8bits((c >> 10) & 0x1F),
|
||||
scale_5bits_to_8bits((c >> 5) & 0x1F),
|
||||
scale_5bits_to_8bits(c & 0x1F), 255));
|
||||
break;
|
||||
}
|
||||
|
||||
case 24:
|
||||
case 32: {
|
||||
const int b = fgetc(m_f);
|
||||
const int g = fgetc(m_f);
|
||||
const int r = fgetc(m_f);
|
||||
int a;
|
||||
if (m_header.palDepth == 32)
|
||||
a = fgetc(m_f);
|
||||
else
|
||||
a = 255;
|
||||
m_palette.setEntry(i, doc::rgba(r, g, b, a));
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
else {
|
||||
count++;
|
||||
c += count;
|
||||
if (type == 1) {
|
||||
if (address+count < end)
|
||||
fread(address, 1, count, f);
|
||||
address += count;
|
||||
}
|
||||
|
||||
template<typename T>
|
||||
bool readUncompressedData(color_t (TgaDecoder::*readPixel)()) {
|
||||
for (int x=0; x<m_header.width; ++x) {
|
||||
if (m_iterator.next<T>((this->*readPixel)()))
|
||||
return true;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
// In the best case (TGA 2.0 spec) this should read just one
|
||||
// scanline, but in old TGA versions (1.0) it was possible to save
|
||||
// several scanlines with the same RLE data.
|
||||
//
|
||||
// Returns true when are are done.
|
||||
template<typename T>
|
||||
bool readRleData(color_t (TgaDecoder::*readPixel)()) {
|
||||
for (int x=0; x<m_header.width && !feof(m_f); ) {
|
||||
int c = fgetc(m_f);
|
||||
if (c & 0x80) {
|
||||
c = (c & 0x7f) + 1;
|
||||
x += c;
|
||||
const T pixel = (this->*readPixel)();
|
||||
while (c-- > 0)
|
||||
if (m_iterator.next<T>(pixel))
|
||||
return true;
|
||||
}
|
||||
else {
|
||||
for (g=0; g<count; g++) {
|
||||
int c = fgetc(f);
|
||||
if (address+2 < end)
|
||||
*((uint16_t*)address) = graya(c, 255);
|
||||
address += 2;
|
||||
++c;
|
||||
x += c;
|
||||
while (c-- > 0) {
|
||||
if (m_iterator.next<T>((this->*readPixel)()))
|
||||
return true;
|
||||
}
|
||||
}
|
||||
}
|
||||
} while (c < w);
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
static void rle_tga_read32(FILE* f, uint32_t* address, int w, bool withAlpha)
|
||||
{
|
||||
uint32_t* end = address + w;
|
||||
unsigned char value[4];
|
||||
int count;
|
||||
int c = 0;
|
||||
color_t fget8_as_index() {
|
||||
return fgetc(m_f);
|
||||
}
|
||||
|
||||
do {
|
||||
count = fgetc(f);
|
||||
if (count & 0x80) {
|
||||
count = (count & 0x7F) + 1;
|
||||
c += count;
|
||||
fread(value, 1, 4, f);
|
||||
while (count--) {
|
||||
if (address+1 < end)
|
||||
*(address++) = rgba(value[2], value[1], value[0],
|
||||
withAlpha ? value[3]: 255);
|
||||
}
|
||||
}
|
||||
color_t fget8_as_gray() {
|
||||
return doc::graya(fgetc(m_f), 255);
|
||||
}
|
||||
|
||||
color_t fget32_as_rgba() {
|
||||
int b = fgetc(m_f);
|
||||
int g = fgetc(m_f);
|
||||
int r = fgetc(m_f);
|
||||
uint8_t a = fgetc(m_f);
|
||||
if (!m_hasAlpha)
|
||||
a = 255;
|
||||
else {
|
||||
count++;
|
||||
c += count;
|
||||
while (count--) {
|
||||
fread(value, 1, 4, f);
|
||||
if (address+1 < end)
|
||||
*(address++) = rgba(value[2], value[1], value[0],
|
||||
withAlpha ? value[3]: 255);
|
||||
}
|
||||
++m_alphaHistogram[a];
|
||||
}
|
||||
} while (c < w);
|
||||
}
|
||||
return doc::rgba(r, g, b, a);
|
||||
}
|
||||
|
||||
static void rle_tga_read24(FILE* f, uint32_t* address, int w)
|
||||
{
|
||||
uint32_t* end = address + w;
|
||||
unsigned char value[4];
|
||||
int count;
|
||||
int c = 0;
|
||||
color_t fget24_as_rgba() {
|
||||
const int b = fgetc(m_f);
|
||||
const int g = fgetc(m_f);
|
||||
const int r = fgetc(m_f);
|
||||
return doc::rgba(r, g, b, 255);
|
||||
}
|
||||
|
||||
do {
|
||||
count = fgetc(f);
|
||||
if (count & 0x80) {
|
||||
count = (count & 0x7F) + 1;
|
||||
c += count;
|
||||
fread(value, 1, 3, f);
|
||||
while (count--) {
|
||||
if (address+1 < end)
|
||||
*(address++) = rgba(value[2], value[1], value[0], 255);
|
||||
}
|
||||
color_t fget16_as_rgba() {
|
||||
const uint16_t v = fgetw(m_f);
|
||||
uint8_t alpha = 255;
|
||||
if (m_hasAlpha) {
|
||||
if ((v & 0x8000) == 0)
|
||||
alpha = 0;
|
||||
++m_alphaHistogram[alpha];
|
||||
}
|
||||
else {
|
||||
count++;
|
||||
c += count;
|
||||
while (count--) {
|
||||
fread(value, 1, 3, f);
|
||||
if (address+1 < end)
|
||||
*(address++) = rgba(value[2], value[1], value[0], 255);
|
||||
}
|
||||
}
|
||||
} while (c < w);
|
||||
}
|
||||
return doc::rgba(scale_5bits_to_8bits((v >> 10) & 0x1F),
|
||||
scale_5bits_to_8bits((v >> 5) & 0x1F),
|
||||
scale_5bits_to_8bits(v & 0x1F),
|
||||
alpha);
|
||||
}
|
||||
|
||||
static void rle_tga_read16(uint32_t* address, int w, FILE *f)
|
||||
{
|
||||
uint32_t* end = address + w;
|
||||
unsigned int value;
|
||||
uint32_t color;
|
||||
int count;
|
||||
int c = 0;
|
||||
FILE* m_f;
|
||||
Header m_header;
|
||||
bool m_hasAlpha = false;
|
||||
Palette m_palette;
|
||||
ImageDataIterator m_iterator;
|
||||
std::vector<uint32_t> m_alphaHistogram;
|
||||
};
|
||||
|
||||
do {
|
||||
count = fgetc(f);
|
||||
if (count & 0x80) {
|
||||
count = (count & 0x7F) + 1;
|
||||
c += count;
|
||||
value = fgetw(f);
|
||||
color = rgba(scale_5bits_to_8bits((value >> 10) & 0x1F),
|
||||
scale_5bits_to_8bits((value >> 5) & 0x1F),
|
||||
scale_5bits_to_8bits(value & 0x1F), 255);
|
||||
|
||||
while (count--) {
|
||||
if (address+1 < end)
|
||||
*(address++) = color;
|
||||
}
|
||||
}
|
||||
else {
|
||||
count++;
|
||||
c += count;
|
||||
while (count--) {
|
||||
value = fgetw(f);
|
||||
color = rgba(scale_5bits_to_8bits((value >> 10) & 0x1F),
|
||||
scale_5bits_to_8bits((value >> 5) & 0x1F),
|
||||
scale_5bits_to_8bits(value & 0x1F), 255);
|
||||
|
||||
if (address+1 < end)
|
||||
*(address++) = color;
|
||||
}
|
||||
}
|
||||
} while (c < w);
|
||||
}
|
||||
|
||||
// Loads a 256 color or 24 bit uncompressed TGA file, returning a bitmap
|
||||
@ -210,192 +488,59 @@ static void rle_tga_read16(uint32_t* address, int w, FILE *f)
|
||||
// should be an array of at least 256 RGB structures).
|
||||
bool TgaFormat::onLoad(FileOp* fop)
|
||||
{
|
||||
unsigned char image_id[256], image_palette[256][3], rgb[4];
|
||||
unsigned char id_length, palette_type, image_type, palette_entry_size;
|
||||
unsigned char bpp, descriptor_bits;
|
||||
short unsigned int palette_colors;
|
||||
short unsigned int image_width, image_height;
|
||||
unsigned int c, i, x, y, yc;
|
||||
int compressed;
|
||||
|
||||
FileHandle handle(open_file_with_exception(fop->filename(), "rb"));
|
||||
FILE* f = handle.get();
|
||||
|
||||
id_length = fgetc(f);
|
||||
palette_type = fgetc(f);
|
||||
image_type = fgetc(f);
|
||||
fgetw(f); // first_color
|
||||
palette_colors = fgetw(f);
|
||||
palette_entry_size = fgetc(f);
|
||||
fgetw(f); // "left" field
|
||||
fgetw(f); // "top" field
|
||||
image_width = fgetw(f);
|
||||
image_height = fgetw(f);
|
||||
bpp = fgetc(f);
|
||||
descriptor_bits = fgetc(f);
|
||||
TgaDecoder decoder(f);
|
||||
|
||||
fread(image_id, 1, id_length, f);
|
||||
|
||||
if (palette_type == 1) {
|
||||
for (i=0; i<palette_colors; i++) {
|
||||
switch (palette_entry_size) {
|
||||
|
||||
case 16:
|
||||
c = fgetw(f);
|
||||
image_palette[i][0] = scale_5bits_to_8bits(c & 0x1F);
|
||||
image_palette[i][1] = scale_5bits_to_8bits((c >> 5) & 0x1F);
|
||||
image_palette[i][2] = scale_5bits_to_8bits((c >> 10) & 0x1F);
|
||||
break;
|
||||
|
||||
case 24:
|
||||
case 32:
|
||||
image_palette[i][0] = fgetc(f);
|
||||
image_palette[i][1] = fgetc(f);
|
||||
image_palette[i][2] = fgetc(f);
|
||||
if (palette_entry_size == 32)
|
||||
fgetc(f);
|
||||
break;
|
||||
}
|
||||
}
|
||||
}
|
||||
else if (palette_type != 0) {
|
||||
ImageSpec spec(ColorMode::RGB, 1, 1);
|
||||
if (!decoder.getImageSpec(spec)) {
|
||||
fop->setError("Unsupported color depth in TGA file: %d bpp, image type=%d.\n",
|
||||
decoder.bitsPerPixel(),
|
||||
decoder.imageType());
|
||||
return false;
|
||||
}
|
||||
|
||||
/* Image type:
|
||||
* 0 = no image data
|
||||
* 1 = uncompressed color mapped
|
||||
* 2 = uncompressed true color
|
||||
* 3 = grayscale
|
||||
* 9 = RLE color mapped
|
||||
* 10 = RLE true color
|
||||
* 11 = RLE grayscale
|
||||
*/
|
||||
compressed = (image_type & 8);
|
||||
image_type &= 7;
|
||||
|
||||
PixelFormat pixelFormat;
|
||||
bool withAlpha = false;
|
||||
|
||||
switch (image_type) {
|
||||
|
||||
/* paletted image */
|
||||
case 1:
|
||||
if ((palette_type != 1) || (bpp != 8)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
for (i=0; i<palette_colors; i++) {
|
||||
fop->sequenceSetColor(i,
|
||||
image_palette[i][2],
|
||||
image_palette[i][1],
|
||||
image_palette[i][0]);
|
||||
}
|
||||
|
||||
pixelFormat = IMAGE_INDEXED;
|
||||
break;
|
||||
|
||||
/* truecolor image */
|
||||
case 2:
|
||||
if ((palette_type != 0) ||
|
||||
((bpp != 15) && (bpp != 16) &&
|
||||
(bpp != 24) && (bpp != 32))) {
|
||||
return false;
|
||||
}
|
||||
withAlpha = ((descriptor_bits & 0xf) == 8);
|
||||
if (withAlpha)
|
||||
fop->sequenceSetHasAlpha(true);
|
||||
pixelFormat = IMAGE_RGB;
|
||||
break;
|
||||
|
||||
/* grayscale image */
|
||||
case 3:
|
||||
if ((palette_type != 0) || (bpp != 8)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
for (i=0; i<256; i++)
|
||||
fop->sequenceSetColor(i, i, i, i);
|
||||
|
||||
pixelFormat = IMAGE_GRAYSCALE;
|
||||
break;
|
||||
|
||||
default:
|
||||
/* TODO add support for more TGA types? */
|
||||
return false;
|
||||
if (!decoder.validPalType()) {
|
||||
fop->setError("Invalid palette type in TGA file.\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
Image* image = fop->sequenceImage(pixelFormat, image_width, image_height);
|
||||
// Palette from TGA file
|
||||
if (decoder.hasPalette()) {
|
||||
const Palette& pal = decoder.palette();
|
||||
for (int i=0; i<pal.size(); ++i) {
|
||||
color_t c = pal.getEntry(i);
|
||||
fop->sequenceSetColor(i,
|
||||
doc::rgba_getr(c),
|
||||
doc::rgba_getg(c),
|
||||
doc::rgba_getb(c));
|
||||
if (doc::rgba_geta(c) < 255)
|
||||
fop->sequenceSetAlpha(i, doc::rgba_geta(c));
|
||||
}
|
||||
}
|
||||
// Generate grayscale palette
|
||||
else if (decoder.isGray()) {
|
||||
for (int i=0; i<256; ++i)
|
||||
fop->sequenceSetColor(i, i, i, i);
|
||||
}
|
||||
|
||||
if (decoder.hasAlpha())
|
||||
fop->sequenceSetHasAlpha(true);
|
||||
|
||||
Image* image = fop->sequenceImage((doc::PixelFormat)spec.colorMode(),
|
||||
spec.width(),
|
||||
spec.height());
|
||||
if (!image)
|
||||
return false;
|
||||
|
||||
for (y=image_height; y; y--) {
|
||||
yc = (descriptor_bits & 0x20) ? image_height-y : y-1;
|
||||
|
||||
switch (image_type) {
|
||||
|
||||
case 1:
|
||||
case 3:
|
||||
if (compressed)
|
||||
rle_tga_read8(f, image->getPixelAddress(0, yc), image_width, image_type);
|
||||
else if (image_type == 1)
|
||||
fread(image->getPixelAddress(0, yc), 1, image_width, f);
|
||||
else {
|
||||
for (x=0; x<image_width; x++)
|
||||
put_pixel_fast<GrayscaleTraits>(image, x, yc, graya(fgetc(f), 255));
|
||||
}
|
||||
break;
|
||||
|
||||
case 2:
|
||||
if (bpp == 32) {
|
||||
if (compressed) {
|
||||
rle_tga_read32(f, (uint32_t*)image->getPixelAddress(0, yc), image_width,
|
||||
withAlpha);
|
||||
}
|
||||
else {
|
||||
for (x=0; x<image_width; x++) {
|
||||
fread(rgb, 1, 4, f);
|
||||
put_pixel_fast<RgbTraits>(image, x, yc,
|
||||
rgba(rgb[2], rgb[1], rgb[0],
|
||||
withAlpha ? rgb[3]: 255));
|
||||
}
|
||||
}
|
||||
}
|
||||
else if (bpp == 24) {
|
||||
if (compressed) {
|
||||
rle_tga_read24(f, (uint32_t*)image->getPixelAddress(0, yc), image_width);
|
||||
}
|
||||
else {
|
||||
for (x=0; x<image_width; x++) {
|
||||
fread(rgb, 1, 3, f);
|
||||
put_pixel_fast<RgbTraits>(image, x, yc, rgba(rgb[2], rgb[1], rgb[0], 255));
|
||||
}
|
||||
}
|
||||
}
|
||||
else {
|
||||
if (compressed) {
|
||||
rle_tga_read16((uint32_t*)image->getPixelAddress(0, yc), image_width, f);
|
||||
}
|
||||
else {
|
||||
for (x=0; x<image_width; x++) {
|
||||
c = fgetw(f);
|
||||
put_pixel_fast<RgbTraits>(
|
||||
image, x, yc, rgba(scale_5bits_to_8bits((c >> 10) & 0x1F),
|
||||
scale_5bits_to_8bits((c >> 5) & 0x1F),
|
||||
scale_5bits_to_8bits(c & 0x1F), 255));
|
||||
}
|
||||
}
|
||||
}
|
||||
break;
|
||||
}
|
||||
|
||||
if (image_height > 1) {
|
||||
fop->setProgress((float)(image_height-y) / (float)(image_height));
|
||||
if (fop->isStop())
|
||||
break;
|
||||
}
|
||||
if (!decoder.readImageData(fop, image)) {
|
||||
fop->setError("Error loading image data from TGA file.\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
decoder.postProcessImageData(image);
|
||||
|
||||
if (ferror(f)) {
|
||||
fop->setError("Error reading file.\n");
|
||||
return false;
|
||||
@ -419,24 +564,25 @@ bool TgaFormat::onSave(FileOp* fop)
|
||||
FileHandle handle(open_file_with_exception_sync_on_close(fop->filename(), "wb"));
|
||||
FILE* f = handle.get();
|
||||
|
||||
fputc(0, f); /* id length (no id saved) */
|
||||
fputc((need_pal) ? 1 : 0, f); /* palette type */
|
||||
/* image type */
|
||||
fputc(0, f); // id length (no id saved)
|
||||
fputc((need_pal) ? 1 : 0, f); // palette type
|
||||
// image type
|
||||
fputc((image->pixelFormat() == IMAGE_RGB ) ? 2 :
|
||||
(image->pixelFormat() == IMAGE_GRAYSCALE) ? 3 :
|
||||
(image->pixelFormat() == IMAGE_INDEXED ) ? 1 : 0, f);
|
||||
fputw(0, f); /* first colour */
|
||||
fputw((need_pal) ? 256 : 0, f); /* number of colours */
|
||||
fputc((need_pal) ? 24 : 0, f); /* palette entry size */
|
||||
fputw(0, f); /* left */
|
||||
fputw(0, f); /* top */
|
||||
fputw(image->width(), f); /* width */
|
||||
fputw(image->height(), f); /* height */
|
||||
fputc(depth, f); /* bits per pixel */
|
||||
fputw(0, f); // first colour
|
||||
fputw((need_pal) ? 256 : 0, f); // number of colours
|
||||
fputc((need_pal) ? 24 : 0, f); // palette entry size
|
||||
fputw(0, f); // left
|
||||
fputw(0, f); // top
|
||||
fputw(image->width(), f); // width
|
||||
fputw(image->height(), f); // height
|
||||
fputc(depth, f); // bits per pixel
|
||||
|
||||
/* descriptor (bottom to top, 8-bit alpha) */
|
||||
fputc(image->pixelFormat() == IMAGE_RGB &&
|
||||
!fop->document()->sprite()->isOpaque() ? 8: 0, f);
|
||||
// descriptor (bottom to top, 8-bit alpha)
|
||||
fputc(
|
||||
(image->pixelFormat() == IMAGE_RGB &&
|
||||
!fop->document()->sprite()->isOpaque() ? 8: 0), f);
|
||||
|
||||
if (need_pal) {
|
||||
for (y=0; y<256; y++) {
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user