1 /*************************************************************************/
2 /*  image_loader_webp.cpp                                                */
3 /*************************************************************************/
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30 #include "image_loader_webp.h"
31 
32 #include "io/marshalls.h"
33 #include "os/os.h"
34 #include "print_string.h"
35 
36 #include <stdlib.h>
37 #include <webp/decode.h>
38 #include <webp/encode.h>
39 
_webp_lossy_pack(const Image & p_image,float p_quality)40 static DVector<uint8_t> _webp_lossy_pack(const Image &p_image, float p_quality) {
41 
42 	ERR_FAIL_COND_V(p_image.empty(), DVector<uint8_t>());
43 
44 	Image img = p_image;
45 	if (img.detect_alpha())
46 		img.convert(Image::FORMAT_RGBA);
47 	else
48 		img.convert(Image::FORMAT_RGB);
49 
50 	Size2 s(img.get_width(), img.get_height());
51 	DVector<uint8_t> data = img.get_data();
52 	DVector<uint8_t>::Read r = data.read();
53 
54 	uint8_t *dst_buff = NULL;
55 	size_t dst_size = 0;
56 	if (img.get_format() == Image::FORMAT_RGB) {
57 
58 		dst_size = WebPEncodeRGB(r.ptr(), s.width, s.height, 3 * s.width, CLAMP(p_quality * 100.0, 0, 100.0), &dst_buff);
59 	} else {
60 		dst_size = WebPEncodeRGBA(r.ptr(), s.width, s.height, 4 * s.width, CLAMP(p_quality * 100.0, 0, 100.0), &dst_buff);
61 	}
62 
63 	ERR_FAIL_COND_V(dst_size == 0, DVector<uint8_t>());
64 	DVector<uint8_t> dst;
65 	dst.resize(4 + dst_size);
66 	DVector<uint8_t>::Write w = dst.write();
67 	w[0] = 'W';
68 	w[1] = 'E';
69 	w[2] = 'B';
70 	w[3] = 'P';
71 	copymem(&w[4], dst_buff, dst_size);
72 	free(dst_buff);
73 	w = DVector<uint8_t>::Write();
74 	return dst;
75 }
76 
_webp_lossy_unpack(const DVector<uint8_t> & p_buffer)77 static Image _webp_lossy_unpack(const DVector<uint8_t> &p_buffer) {
78 
79 	int size = p_buffer.size() - 4;
80 	ERR_FAIL_COND_V(size <= 0, Image());
81 	DVector<uint8_t>::Read r = p_buffer.read();
82 
83 	ERR_FAIL_COND_V(r[0] != 'W' || r[1] != 'E' || r[2] != 'B' || r[3] != 'P', Image());
84 	WebPBitstreamFeatures features;
85 	if (WebPGetFeatures(&r[4], size, &features) != VP8_STATUS_OK) {
86 		ERR_EXPLAIN("Error unpacking WEBP image:");
87 		ERR_FAIL_V(Image());
88 	}
89 
90 	//print_line("width: "+itos(features.width));
91 	//print_line("height: "+itos(features.height));
92 	//print_line("alpha: "+itos(features.has_alpha));
93 
94 	DVector<uint8_t> dst_image;
95 	int datasize = features.width * features.height * (features.has_alpha ? 4 : 3);
96 	dst_image.resize(datasize);
97 
98 	DVector<uint8_t>::Write dst_w = dst_image.write();
99 
100 	bool errdec = false;
101 	if (features.has_alpha) {
102 		errdec = WebPDecodeRGBAInto(&r[4], size, dst_w.ptr(), datasize, 4 * features.width) == NULL;
103 	} else {
104 		errdec = WebPDecodeRGBInto(&r[4], size, dst_w.ptr(), datasize, 3 * features.width) == NULL;
105 	}
106 
107 	//ERR_EXPLAIN("Error decoding webp! - "+p_file);
108 	ERR_FAIL_COND_V(errdec, Image());
109 
110 	dst_w = DVector<uint8_t>::Write();
111 
112 	return Image(features.width, features.height, 0, features.has_alpha ? Image::FORMAT_RGBA : Image::FORMAT_RGB, dst_image);
113 }
114 
load_image(Image * p_image,FileAccess * f)115 Error ImageLoaderWEBP::load_image(Image *p_image, FileAccess *f) {
116 
117 	uint32_t size = f->get_len();
118 	DVector<uint8_t> src_image;
119 	src_image.resize(size);
120 
121 	WebPBitstreamFeatures features;
122 
123 	DVector<uint8_t>::Write src_w = src_image.write();
124 	f->get_buffer(src_w.ptr(), size);
125 	ERR_FAIL_COND_V(f->eof_reached(), ERR_FILE_EOF);
126 
127 	if (WebPGetFeatures(src_w.ptr(), size, &features) != VP8_STATUS_OK) {
128 		f->close();
129 		//ERR_EXPLAIN("Error decoding WEBP image: "+p_file);
130 		ERR_FAIL_V(ERR_FILE_CORRUPT);
131 	}
132 
133 	print_line("width: " + itos(features.width));
134 	print_line("height: " + itos(features.height));
135 	print_line("alpha: " + itos(features.has_alpha));
136 
137 	src_w = DVector<uint8_t>::Write();
138 
139 	DVector<uint8_t> dst_image;
140 	int datasize = features.width * features.height * (features.has_alpha ? 4 : 3);
141 	dst_image.resize(datasize);
142 
143 	DVector<uint8_t>::Read src_r = src_image.read();
144 	DVector<uint8_t>::Write dst_w = dst_image.write();
145 
146 	bool errdec = false;
147 	if (features.has_alpha) {
148 		errdec = WebPDecodeRGBAInto(src_r.ptr(), size, dst_w.ptr(), datasize, 4 * features.width) == NULL;
149 	} else {
150 		errdec = WebPDecodeRGBInto(src_r.ptr(), size, dst_w.ptr(), datasize, 3 * features.width) == NULL;
151 	}
152 
153 	//ERR_EXPLAIN("Error decoding webp! - "+p_file);
154 	ERR_FAIL_COND_V(errdec, ERR_FILE_CORRUPT);
155 
156 	src_r = DVector<uint8_t>::Read();
157 	dst_w = DVector<uint8_t>::Write();
158 
159 	*p_image = Image(features.width, features.height, 0, features.has_alpha ? Image::FORMAT_RGBA : Image::FORMAT_RGB, dst_image);
160 
161 	return OK;
162 }
163 
get_recognized_extensions(List<String> * p_extensions) const164 void ImageLoaderWEBP::get_recognized_extensions(List<String> *p_extensions) const {
165 
166 	p_extensions->push_back("webp");
167 }
168 
ImageLoaderWEBP()169 ImageLoaderWEBP::ImageLoaderWEBP() {
170 
171 	Image::lossy_packer = _webp_lossy_pack;
172 	Image::lossy_unpacker = _webp_lossy_unpack;
173 }
174