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Code Issues Releases Wiki Activity

reads images using libpng now (SDL_image available as optional compilation flag)

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This commit is contained in:
Zeno Rogue 2017-12-21 12:00:34 +01:00
parent 57a5337b9f
commit 91adb393b3
2 changed files with 68 additions and 14 deletions
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3
init.cpp
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@ -121,7 +121,7 @@
#endif
#ifndef CAP_TEXTURE
#define CAP_TEXTURE 0 // CAP_PNG
#define CAP_TEXTURE CAP_GL && CAP_PNG || CAP_SDL_IMG
#endif
#ifndef CAP_MODEL
@ -184,7 +184,6 @@
#define CAP_SDL_IMG 0
#endif
#ifndef CAP_SDLTTF
#define CAP_SDLTTF (CAP_SDL && !ISMOBILE && !ISWEB)
#endif

77
textures.cpp
View File

@ -1,4 +1,8 @@
#if CAP_SDL_IMG
#include <SDL/SDL_image.h>
#elif CAP_PNG
#include <png.h>
#endif
#if CAP_TEXTURE
namespace texture {
@ -93,25 +97,71 @@ bool whitetexture() {
bool readtexture() {
#if CAP_SDL_IMG
SDL_Surface *txt = IMG_Load(texturename.c_str());
if(!txt) {
addMessage(XLAT("Failed to load %1", texturename));
return false;
}
auto txt2 = convertSurface(txt);
int tx = txt->w, ty = txt->h;
SDL_FreeSurface(txt);
vector<int> half_expanded(twidth * ty);
texture_pixels.resize(twidth * twidth);
int tx = txt2->w, ty = txt2->h;
auto pix = [&] (int x, int y) { return qpixel(txt2, x, y); };
#elif CAP_PNG
FILE *f = fopen(texturename.c_str(), "r");
png_structp png = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(!png) return false;
if(setjmp(png_jmpbuf(png))) return false;
png_init_io(png, f);
// set the expected format
png_infop info = png_create_info_struct(png);
png_read_info(png, info);
int tx = png_get_image_width(png, info);
int ty = png_get_image_height(png, info);
png_byte color_type = png_get_color_type(png, info);
png_byte bit_depth = png_get_bit_depth(png, info);
if(bit_depth == 16) png_set_strip_16(png);
if(color_type == PNG_COLOR_TYPE_PALETTE) png_set_palette_to_rgb(png);
if(color_type == PNG_COLOR_TYPE_GRAY && bit_depth < 8) png_set_expand_gray_1_2_4_to_8(png);
if(png_get_valid(png, info, PNG_INFO_tRNS)) png_set_tRNS_to_alpha(png);
if(color_type == PNG_COLOR_TYPE_RGB ||
color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_PALETTE)
png_set_filler(png, 0xFF, PNG_FILLER_AFTER);
if(color_type == PNG_COLOR_TYPE_GRAY ||
color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
png_set_gray_to_rgb(png);
png_read_update_info(png, info);
// read png
vector<png_bytep> row_pointers(ty);
vector<int> origpixels(ty * tx);
for(int y = 0; y < ty; y++)
row_pointers[y] = (png_bytep) & origpixels[y * tx];
png_read_image(png, &row_pointers[0]);
fclose(f);
auto pix = [&] (int x, int y) {
if(x<0 || y<0 || x >= tx || y >= ty) return 0;
return origpixels[y*tx + x];
};
#endif
if(tx == twidth && ty == twidth) {
int i = 0;
for(int y=0; y<ty; y++)
for(int x=0; x<tx; x++)
texture_pixels[i++] = qpixel(txt2, x, y);
texture_pixels[i++] = pix(x, y);
}
else {
@ -126,20 +176,25 @@ bool readtexture() {
for(int x=0; x<twidth; x++)
texture_pixels[y*twidth+x] = qpixel(txt2, y%ty, x%tx); */
vector<int> half_expanded(twidth * ty);
for(int y=0; y<ty; y++)
scale_colorarray(origdim,
[&] (int x) { return pix(base_x + x,y); },
[&] (int x, int v) { half_expanded[twidth * y + x] = v; }
);
texture_pixels.resize(twidth * twidth);
for(int x=0; x<twidth; x++)
scale_colorarray(origdim,
[&] (int y) { return base_y+y < 0 || base_y+y >= ty ? 0 : half_expanded[x + (base_y + y) * twidth]; },
[&] (int y, int v) { texture_pixels[twidth * y + x] = v; }
);
for(int y=0; y<ty; y++)
scale_colorarray(origdim,
[&] (int x) { return qpixel(txt2, base_x + x, y); },
[&] (int x, int v) { half_expanded[twidth * y + x] = v; }
);
}
#if CAP_SDL_IMG
SDL_FreeSurface(txt2);
#endif
return true;
}