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[DEV] read special png file

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This commit is contained in:
Edouard DUPIN 2014-10-20 21:28:23 +02:00
parent e07648a33c
commit aa66ac176f
1 changed files with 64 additions and 1 deletions
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65
egami/wrapperPNG.cpp
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@ -101,6 +101,36 @@ bool egami::loadPNG(const std::string& _inputFile, egami::Image& _ouputImage) {
int32_t bit_depth = png_get_bit_depth(png_ptr, info_ptr);
png_read_update_info(png_ptr, info_ptr);
setjmp(png_jmpbuf(png_ptr));
/* expand palette images to RGB, low-bit-depth grayscale images to 8 bits,
* transparency chunks to full alpha channel; strip 16-bit-per-sample
* images to 8 bits per sample; and convert grayscale to RGB[A] */
// TODO : TEMPORARY section : [START]
int32_t color_type = png_get_color_type(png_ptr, info_ptr);
if (color_type == PNG_COLOR_TYPE_PALETTE) {
png_set_expand(png_ptr);
}
if (color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) {
png_set_expand(png_ptr);
}
if (png_get_valid(png_ptr, info_ptr, PNG_INFO_tRNS)) {
png_set_expand(png_ptr);
}
if (bit_depth == 16) {
png_set_strip_16(png_ptr);
}
/*
if ( color_type == PNG_COLOR_TYPE_GRAY
|| color_type == PNG_COLOR_TYPE_GRAY_ALPHA) {
png_set_gray_to_rgb(png_ptr);
}
*/
// TODO : TEMPORARY section : [STOP]
bit_depth = png_get_bit_depth(png_ptr, info_ptr);
png_read_update_info(png_ptr, info_ptr);
row_pointers = (png_bytep*) malloc(sizeof(png_bytep) * height);
rowbytes = width * ((bit_depth == 16) ? 8 : 4);
@ -138,8 +168,41 @@ bool egami::loadPNG(const std::string& _inputFile, egami::Image& _ouputImage) {
delete row_pointers[y];
}
break;
case PNG_COLOR_TYPE_GRAY:
// Conversion to OpenGL texture
for (y = 0; y < height; y++) {
png_byte* row = row_pointers[y];
for (x = 0; x < width; x++) {
png_byte* ptr = &(row[x]);
tmpColor.set(ptr[0],ptr[0],ptr[0]);
_ouputImage.set(ivec2(x,y), tmpColor);
}
delete row_pointers[y];
}
break;
case PNG_COLOR_TYPE_GRAY_ALPHA:
// Conversion to OpenGL texture
for (y = 0; y < height; y++) {
png_byte* row = row_pointers[y];
for (x = 0; x < width; x++) {
png_byte* ptr = &(row[x*2]);
tmpColor.set(ptr[0],ptr[0],ptr[0],ptr[1]);
_ouputImage.set(ivec2(x,y), tmpColor);
}
delete row_pointers[y];
}
break;
default:
EGAMI_ERROR("Must be RGBA/RGB");
EGAMI_ERROR("Must be RGB+alpha?/GRAY+alpha? not supported : " << (int64_t)png_get_color_type(png_ptr, info_ptr));
if ((png_get_color_type(png_ptr, info_ptr) & PNG_COLOR_MASK_PALETTE) != 0) {
EGAMI_ERROR(" palette");
}
if ((png_get_color_type(png_ptr, info_ptr) & PNG_COLOR_MASK_COLOR) != 0) {
EGAMI_ERROR(" color");
}
if ((png_get_color_type(png_ptr, info_ptr) & PNG_COLOR_MASK_ALPHA) != 0) {
EGAMI_ERROR(" Alpha");
}
return false;
}
fileName.fileClose();