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Support loading paletted PNG images.

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This commit is contained in:
Pavel Krajcevski 2013-10-14 20:56:55 -04:00
parent d0260d3755
commit 0ecd678a58
1 changed files with 39 additions and 4 deletions
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43
IO/src/ImageLoaderPNG.cpp
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@ -43,8 +43,9 @@
#include "ImageLoaderPNG.h"
#include <stdio.h>
#include <assert.h>
#include <algorithm>
#include <cstdio>
#include <cassert>
#include <png.h>
@ -139,14 +140,45 @@ bool ImageLoaderPNG::ReadData() {
switch(colorType) {
default:
case PNG_COLOR_TYPE_PALETTE:
ReportError("PNG color type unsupported");
png_destroy_read_struct(&png_ptr, NULL, NULL);
return false;
case PNG_COLOR_TYPE_PALETTE:
{
m_RedChannelPrecision = bitDepth;
m_RedData = new unsigned char[numPixels];
m_GreenChannelPrecision = bitDepth;
m_GreenData = new unsigned char[numPixels];
m_BlueChannelPrecision = bitDepth;
m_BlueData = new unsigned char[numPixels];
png_colorp palette;
int nPaletteEntries;
png_uint_32 ret = png_get_PLTE(png_ptr, info_ptr, &palette, &nPaletteEntries);
assert(ret == PNG_INFO_PLTE);
for(uint32 i = 0; i < m_Height; i++) {
png_read_row(png_ptr, rowData, NULL);
unsigned int rowOffset = i * m_Width;
for(uint32 j = 0; j < m_Width; j++) {
assert(rowData[j] < nPaletteEntries);
const png_color &c = palette[::std::min<unsigned char>(rowData[j], nPaletteEntries - 1)];
m_RedData[rowOffset + j] = c.red;
m_GreenData[rowOffset + j] = c.green;
m_BlueData[rowOffset + j] = c.blue;
}
}
}
break;
case PNG_COLOR_TYPE_GRAY: {
m_RedChannelPrecision = bitDepth;
m_RedData = new unsigned char[numPixels];
m_GreenChannelPrecision = bitDepth;
m_GreenData = new unsigned char[numPixels];
m_BlueChannelPrecision = bitDepth;
m_BlueData = new unsigned char[numPixels];
for(uint32 i = 0; i < m_Height; i++) {
@ -156,7 +188,10 @@ bool ImageLoaderPNG::ReadData() {
unsigned int byteIdx = 0;
for(uint32 j = 0; j < m_Width; j++) {
m_RedData[rowOffset + j] = rowData[byteIdx++];
m_RedData[rowOffset + j] = rowData[byteIdx];
m_GreenData[rowOffset + j] = rowData[byteIdx];
m_BlueData[rowOffset + j] = rowData[byteIdx];
byteIdx++;
}
assert(byteIdx == bpr);