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-rw-r--r--plugingui/image.cc91
1 files changed, 43 insertions, 48 deletions
diff --git a/plugingui/image.cc b/plugingui/image.cc
index 1a0e73c..4864007 100644
--- a/plugingui/image.cc
+++ b/plugingui/image.cc
@@ -26,6 +26,8 @@
*/
#include "image.h"
+#include "resource.h"
+
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
@@ -42,27 +44,49 @@ void abort_(const char * s, ...)
abort();
}
+// http://blog.hammerian.net/2009/reading-png-images-from-memory/
+
+typedef struct {
+ size_t p;
+ size_t size;
+ const char *data;
+} data_io_t;
+
+static void dio_reader(png_structp png_ptr, png_bytep buf, png_size_t size)
+{
+ data_io_t *dio = (data_io_t *)png_get_io_ptr(png_ptr);
+
+ if(size > dio->size - dio->p) png_error(png_ptr, "Could not read bytes.");
+
+ memcpy(buf, (dio->data + dio->p), size);
+ dio->p += size;
+}
+
GUI::Image::Image(const char* data, size_t size)
{
+ load(data, size);
}
GUI::Image::Image(std::string filename)
{
- char header[8]; // 8 is the maximum size that can be checked
-
- /* open file and test for it being a png */
- FILE *fp = fopen(filename.c_str(), "rb");
- if (!fp)
- abort_("[read_png_file] File %s could not be opened for reading",
- filename.c_str());
- size_t r = fread(header, 1, 8, fp);
- (void)r;
+ GUI::Resource rc(filename);
+ load(rc.data(), rc.size());
+}
+
+GUI::Image::~Image()
+{
+}
+
+void GUI::Image::load(const char* data, size_t size)
+{
+ const char *header = data;
+
+ // test for it being a png:
if(png_sig_cmp((const png_byte*)header, 0, 8)) {
- abort_("[read_png_file] File %s is not recognized as a PNG file",
- filename.c_str());
+ abort_("[read_png_file] File is not recognized as a PNG file");
}
- /* initialize stuff */
+ // initialize stuff
png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
if(!png_ptr) {
@@ -78,7 +102,13 @@ GUI::Image::Image(std::string filename)
abort_("[read_png_file] Error during init_io");
}
- png_init_io(png_ptr, fp);
+ //png_init_io(png_ptr, fp);
+ data_io_t dio;
+ dio.data = data;
+ dio.size = size;
+ dio.p = 8; // skip header
+ png_set_read_fn(png_ptr, &dio, dio_reader);
+
png_set_sig_bytes(png_ptr, 8);
png_read_info(png_ptr, info_ptr);
@@ -104,41 +134,6 @@ GUI::Image::Image(std::string filename)
}
png_read_image(png_ptr, row_pointers);
-
- fclose(fp);
-}
-#if 0
-void process_file(void)
-{
- if(png_get_color_type(png_ptr, info_ptr) == PNG_COLOR_TYPE_RGB) {
- abort_("[process_file] input file is PNG_COLOR_TYPE_RGB but must be"
- " PNG_COLOR_TYPE_RGBA (lacks the alpha channel)");
- }
-
- if(png_get_color_type(png_ptr, info_ptr) != PNG_COLOR_TYPE_RGBA) {
- abort_("[process_file] color_type of input file must be "
- "PNG_COLOR_TYPE_RGBA (%d) (is %d)",
- PNG_COLOR_TYPE_RGBA, png_get_color_type(png_ptr, info_ptr));
- }
-
- size_t x, y;
- for(y = 0; y < height(); y++) {
- png_byte* row = row_pointers[y];
- for(x = 0; x < width; x++) {
- png_byte* ptr = &(row[x*4]);
- printf("Pixel at position [%d - %d] has RGBA values: %d - %d - %d - %d\n",
- x, y, ptr[0], ptr[1], ptr[2], ptr[3]);
-
- /* set red value to 0 and green value to the blue one */
- ptr[0] = 0;
- ptr[1] = ptr[2];
- }
- }
-}
-#endif
-
-GUI::Image::~Image()
-{
}
size_t GUI::Image::width()