--- /dev/null
+#ifdef WITH_DEVIL
+#include <IL/il.h>
+#endif
+#ifdef WITH_LIBPNG
+#include <png.h>
+#include <msp/io/file.h>
+#include <msp/io/memory.h>
+#endif
+#include "image.h"
+
+using namespace std;
+
+namespace Msp {
+namespace Graphics {
+
+struct Image::Private
+{
+#ifdef WITH_DEVIL
+ unsigned id;
+#endif
+#ifdef WITH_LIBPNG
+ PixelFormat fmt;
+ unsigned width;
+ unsigned height;
+ char *data;
+#endif
+
+ Private();
+};
+
+Image::Private::Private()
+{
+#ifdef WITH_DEVIL
+ id = 0;
+#endif
+#ifdef WITH_LIBPNG
+ fmt = RGB;
+ width = 0;
+ height = 0;
+ data = 0;
+#endif
+}
+
+
+namespace {
+
+#ifdef WITH_LIBPNG
+void read(png_struct *png, png_byte *data, png_size_t size)
+{
+ IO::Base *in = reinterpret_cast<IO::Base *>(png_get_io_ptr(png));
+ in->read(reinterpret_cast<char *>(data), size);
+}
+
+void load_png(IO::Base &in, Image::Private &priv)
+{
+ png_struct *png = 0;
+ png_info *info = 0;
+ priv.data = 0;
+
+ try
+ {
+ png = png_create_read_struct(PNG_LIBPNG_VER_STRING, 0, 0, 0);
+ info = png_create_info_struct(png);
+
+ if(setjmp(png_jmpbuf(png)))
+ throw bad_image_data("PNG error");
+
+ png_set_read_fn(png, &in, read);
+ png_read_info(png, info);
+ png_uint_32 width;
+ png_uint_32 height;
+ int depth;
+ int color;
+ png_get_IHDR(png, info, &width, &height, &depth, &color, 0, 0, 0);
+ priv.width = width;
+ priv.height = height;
+ if(depth!=8)
+ throw unsupported_image_format("depth!=8");
+ switch(color)
+ {
+ case PNG_COLOR_TYPE_PALETTE: priv.fmt = COLOR_INDEX; break;
+ case PNG_COLOR_TYPE_GRAY: priv.fmt = LUMINANCE; break;
+ case PNG_COLOR_TYPE_GRAY_ALPHA: priv.fmt = LUMINANCE_ALPHA; break;
+ case PNG_COLOR_TYPE_RGB: priv.fmt = RGB; break;
+ case PNG_COLOR_TYPE_RGB_ALPHA: priv.fmt = RGBA; break;
+ default: throw unsupported_image_format("unknown color type");
+ }
+
+ unsigned nchans = png_get_channels(png, info);
+ if(nchans==4 && priv.fmt==RGB)
+ png_set_strip_alpha(png);
+
+ unsigned rowstride = priv.width*nchans;
+ priv.data = new char[rowstride*priv.height];
+ for(unsigned y=0; y<priv.height; ++y)
+ png_read_row(png, reinterpret_cast<png_byte *>(priv.data+rowstride*(priv.height-1-y)), 0);
+
+ png_read_end(png, 0);
+ png_destroy_read_struct(&png, &info, 0);
+ }
+ catch(...)
+ {
+ png_destroy_read_struct(&png, &info, 0);
+ delete[] priv.data;
+ throw;
+ }
+}
+#endif
+
+#ifdef WITH_DEVIL
+void ensure_devil_image(unsigned &id)
+{
+ static bool init_done = false;
+
+ if(!init_done)
+ {
+ ilInit();
+ ilEnable(IL_ORIGIN_SET);
+ ilOriginFunc(IL_ORIGIN_LOWER_LEFT);
+ init_done = true;
+ }
+
+ if(!id)
+ ilGenImages(1, &id);
+}
+#endif
+
+}
+
+
+Image::Image():
+ priv(new Private)
+{
+#if !defined(WITH_DEVIL) && !defined(WITH_LIBPNG)
+ throw runtime_error("no image support");
+#endif
+}
+
+Image::~Image()
+{
+#ifdef WITH_DEVIL
+ if(priv->id)
+ ilDeleteImages(1, &priv->id);
+#endif
+#ifdef WITH_LIBPNG
+ delete[] priv->data;
+#endif
+ delete priv;
+}
+
+void Image::load_file(const string &fn)
+{
+#ifdef WITH_LIBPNG
+ if(fn.size()>4 && !fn.compare(fn.size()-4, 4, ".png"))
+ {
+ IO::BufferedFile file(fn);
+ load_png(file, *priv);
+ }
+ else
+#endif
+ {
+#ifdef WITH_DEVIL
+ ensure_devil_image(priv->id);
+ ilBindImage(priv->id);
+ if(!ilLoadImage(const_cast<char *>(fn.c_str())))
+ throw bad_image_data("IL error");
+#else
+ throw unsupported_image_format("DevIL needed for non-PNG images");
+#endif
+ }
+ (void)fn;
+}
+
+void Image::load_memory(const void *data, unsigned size)
+{
+#ifdef WITH_LIBPNG
+ if(!png_sig_cmp(reinterpret_cast<png_byte *>(const_cast<void *>(data)), 0, 8))
+ {
+ IO::Memory mem(reinterpret_cast<const char *>(data), size);
+ load_png(mem, *priv);
+ }
+ else
+#endif
+ {
+#ifdef WITH_DEVIL
+ ensure_devil_image(priv->id);
+ ilBindImage(priv->id);
+ if(!ilLoadL(IL_TYPE_UNKNOWN, const_cast<void *>(data), size))
+ throw bad_image_data("IL error");
+#else
+ throw unsupported_image_format("DevIL needed for non-PNG images");
+#endif
+ }
+ (void)data;
+ (void)size;
+}
+
+PixelFormat Image::get_format() const
+{
+#ifdef WITH_LIBPNG
+ if(priv->data)
+ return priv->fmt;
+#endif
+#ifdef WITH_DEVIL
+ if(priv->id)
+ {
+ ilBindImage(priv->id);
+ switch(ilGetInteger(IL_IMAGE_FORMAT))
+ {
+ case IL_COLOR_INDEX: return COLOR_INDEX;
+ case IL_LUMINANCE: return LUMINANCE;
+ case IL_LUMINANCE_ALPHA: return LUMINANCE_ALPHA;
+ case IL_RGB: return RGB;
+ case IL_RGBA: return RGBA;
+ case IL_BGR: return BGR;
+ case IL_BGRA: return BGRA;
+ // XXX bad, should throw when loading
+ default: throw invalid_argument("unknown pixel format in image");
+ }
+ }
+#endif
+ return RGB;
+}
+
+unsigned Image::get_width() const
+{
+#ifdef WITH_LIBPNG
+ if(priv->data)
+ return priv->width;
+#endif
+#ifdef WITH_DEVIL
+ if(priv->id)
+ {
+ ilBindImage(priv->id);
+ return ilGetInteger(IL_IMAGE_WIDTH);
+ }
+#endif
+ return 0;
+}
+
+unsigned Image::get_height() const
+{
+#ifdef WITH_LIBPNG
+ if(priv->data)
+ return priv->height;
+#endif
+#ifdef WITH_DEVIL
+ if(priv->id)
+ {
+ ilBindImage(priv->id);
+ return ilGetInteger(IL_IMAGE_HEIGHT);
+ }
+#endif
+ return 0;
+}
+
+const void *Image::get_data() const
+{
+#ifdef WITH_LIBPNG
+ if(priv->data)
+ return priv->data;
+#endif
+#ifdef WITH_DEVIL
+ if(priv->id)
+ {
+ ilBindImage(priv->id);
+ return ilGetData();
+ }
+#endif
+ return 0;
+}
+
+} // namespace Graphics
+} // namespace Msp
projects / libs / gui.git / blobdiff