diff options
Diffstat (limited to 'core/image.cpp')
| -rw-r--r-- | core/image.cpp | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/core/image.cpp b/core/image.cpp index c31fa47847..06b7a78488 100644 --- a/core/image.cpp +++ b/core/image.cpp @@ -34,6 +34,33 @@ #include "print_string.h" #include <stdio.h> + +const char* Image::format_names[Image::FORMAT_MAX]={ + "Grayscale", + "Intensity", + "GrayscaleAlpha", + "RGB", + "RGBA", + "Indexed", + "IndexedAlpha", + "YUV422", + "YUV444", + "BC1", + "BC2", + "BC3", + "BC4", + "BC5", + "PVRTC2", + "PVRTC2Alpha", + "PVRTC4", + "PVRTC4Alpha", + "ETC", + "ATC", + "ATCAlphaExp", + "ATCAlphaInterp", + +}; + SavePNGFunc Image::save_png_func = NULL; void Image::_put_pixel(int p_x,int p_y, const BColor& p_color, unsigned char *p_data) { @@ -400,6 +427,102 @@ Image::Format Image::get_format() const{ return format; } +static double _bicubic_interp_kernel( double x ) { + + x = ABS(x); + + double bc = 0; + + if ( x <= 1 ) + bc = ( 1.5 * x - 2.5 ) * x * x + 1; + else if ( x < 2 ) + bc = ( ( -0.5 * x + 2.5 ) * x - 4 ) * x + 2; + + + return bc; +} + +template<int CC> +static void _scale_cubic(const uint8_t* p_src, uint8_t* p_dst, uint32_t p_src_width, uint32_t p_src_height, uint32_t p_dst_width, uint32_t p_dst_height) { + + + // get source image size + int width = p_src_width; + int height = p_src_height; + double xfac = (double) width / p_dst_width; + double yfac = (double) height / p_dst_height; + // coordinates of source points and cooefficiens + double ox, oy, dx, dy, k1, k2; + int ox1, oy1, ox2, oy2; + // destination pixel values + // width and height decreased by 1 + int ymax = height - 1; + int xmax = width - 1; + // temporary pointer + + for ( int y = 0; y < p_dst_height; y++ ) { + // Y coordinates + oy = (double) y * yfac - 0.5f; + oy1 = (int) oy; + dy = oy - (double) oy1; + + for ( int x = 0; x < p_dst_width; x++ ) { + // X coordinates + ox = (double) x * xfac - 0.5f; + ox1 = (int) ox; + dx = ox - (double) ox1; + + // initial pixel value + + uint8_t *dst=p_dst + (y*p_dst_width+x)*CC; + + double color[CC]; + for(int i=0;i<CC;i++) { + color[i]=0; + } + + + + for ( int n = -1; n < 3; n++ ) { + // get Y cooefficient + k1 = _bicubic_interp_kernel( dy - (double) n ); + + oy2 = oy1 + n; + if ( oy2 < 0 ) + oy2 = 0; + if ( oy2 > ymax ) + oy2 = ymax; + + for ( int m = -1; m < 3; m++ ) { + // get X cooefficient + k2 = k1 * _bicubic_interp_kernel( (double) m - dx ); + + ox2 = ox1 + m; + if ( ox2 < 0 ) + ox2 = 0; + if ( ox2 > xmax ) + ox2 = xmax; + + // get pixel of original image + const uint8_t *p = p_src + (oy2 * p_src_width + ox2)*CC; + + for(int i=0;i<CC;i++) { + + color[i]+=p[i]*k2; + } + } + } + + for(int i=0;i<CC;i++) { + dst[i]=CLAMP(Math::fast_ftoi(color[i]),0,255); + } + } + } +} + + + + template<int CC> static void _scale_bilinear(const uint8_t* p_src, uint8_t* p_dst, uint32_t p_src_width, uint32_t p_src_height, uint32_t p_dst_width, uint32_t p_dst_height) { @@ -559,6 +682,17 @@ void Image::resize( int p_width, int p_height, Interpolation p_interpolation ) { } } break; + case INTERPOLATE_CUBIC: { + + switch(get_format_pixel_size(format)) { + case 1: _scale_cubic<1>(r_ptr,w_ptr,width,height,p_width,p_height); break; + case 2: _scale_cubic<2>(r_ptr,w_ptr,width,height,p_width,p_height); break; + case 3: _scale_cubic<3>(r_ptr,w_ptr,width,height,p_width,p_height); break; + case 4: _scale_cubic<4>(r_ptr,w_ptr,width,height,p_width,p_height); break; + } + + } break; + } @@ -2248,6 +2382,12 @@ void Image::fix_alpha_edges() { } +String Image::get_format_name(Format p_format) { + + ERR_FAIL_INDEX_V(p_format,FORMAT_MAX,String()); + return format_names[p_format]; +} + Image::Image(const uint8_t* p_png,int p_len) { width=0; |