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-rw-r--r--minui/resources.c167
1 files changed, 67 insertions, 100 deletions
diff --git a/minui/resources.c b/minui/resources.c
index 5beb6a6d9..7ecfeefce 100644
--- a/minui/resources.c
+++ b/minui/resources.c
@@ -29,97 +29,84 @@
#include <pixelflinger/pixelflinger.h>
+#include <png.h>
+
#include "minui.h"
-// File signature for BMP files.
-// The letters 'BM' as a little-endian unsigned short.
-
-#define BMP_SIGNATURE 0x4d42
-
-typedef struct {
- // constant, value should equal BMP_SIGNATURE
- unsigned short bfType;
- // size of the file in bytes.
- unsigned long bfSize;
- // must always be set to zero.
- unsigned short bfReserved1;
- // must always be set to zero.
- unsigned short bfReserved2;
- // offset from the beginning of the file to the bitmap data.
- unsigned long bfOffBits;
-
- // The BITMAPINFOHEADER:
- // size of the BITMAPINFOHEADER structure, in bytes.
- unsigned long biSize;
- // width of the image, in pixels.
- unsigned long biWidth;
- // height of the image, in pixels.
- unsigned long biHeight;
- // number of planes of the target device, must be set to 1.
- unsigned short biPlanes;
- // number of bits per pixel.
- unsigned short biBitCount;
- // type of compression, zero means no compression.
- unsigned long biCompression;
- // size of the image data, in bytes. If there is no compression,
- // it is valid to set this member to zero.
- unsigned long biSizeImage;
- // horizontal pixels per meter on the designated targer device,
- // usually set to zero.
- unsigned long biXPelsPerMeter;
- // vertical pixels per meter on the designated targer device,
- // usually set to zero.
- unsigned long biYPelsPerMeter;
- // number of colors used in the bitmap, if set to zero the
- // number of colors is calculated using the biBitCount member.
- unsigned long biClrUsed;
- // number of color that are 'important' for the bitmap,
- // if set to zero, all colors are important.
- unsigned long biClrImportant;
-} __attribute__((packed)) BitMapFileHeader;
+// libpng gives "undefined reference to 'pow'" errors, and I have no
+// idea how to convince the build system to link with -lm. We don't
+// need this functionality (it's used for gamma adjustment) so provide
+// a dummy implementation to satisfy the linker.
+double pow(double x, double y) {
+ return x;
+}
int res_create_surface(const char* name, gr_surface* pSurface) {
char resPath[256];
- BitMapFileHeader header;
GGLSurface* surface = NULL;
int result = 0;
-
- snprintf(resPath, sizeof(resPath)-1, "/res/images/%s.bmp", name);
+ unsigned char header[8];
+ png_structp png_ptr = NULL;
+ png_infop info_ptr = NULL;
+
+ snprintf(resPath, sizeof(resPath)-1, "/res/images/%s.png", name);
resPath[sizeof(resPath)-1] = '\0';
- int fd = open(resPath, O_RDONLY);
- if (fd == -1) {
+ FILE* fp = fopen(resPath, "rb");
+ if (fp == NULL) {
result = -1;
goto exit;
}
- size_t bytesRead = read(fd, &header, sizeof(header));
+
+ size_t bytesRead = fread(header, 1, sizeof(header), fp);
if (bytesRead != sizeof(header)) {
result = -2;
goto exit;
}
- if (header.bfType != BMP_SIGNATURE) {
- result = -3; // Not a legal header
+
+ if (png_sig_cmp(header, 0, sizeof(header))) {
+ result = -3;
goto exit;
}
- if (header.biPlanes != 1) {
+
+ png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+ if (!png_ptr) {
result = -4;
goto exit;
}
- if (!(header.biBitCount == 24 || header.biBitCount == 32)) {
+
+ info_ptr = png_create_info_struct(png_ptr);
+ if (!info_ptr) {
result = -5;
goto exit;
}
- if (header.biCompression != 0) {
+
+ if (setjmp(png_jmpbuf(png_ptr))) {
result = -6;
goto exit;
}
- size_t width = header.biWidth;
- size_t height = header.biHeight;
+
+ png_init_io(png_ptr, fp);
+ png_set_sig_bytes(png_ptr, sizeof(header));
+ png_read_info(png_ptr, info_ptr);
+
+ size_t width = info_ptr->width;
+ size_t height = info_ptr->height;
size_t stride = 4 * width;
size_t pixelSize = stride * height;
-
+
+ int color_type = info_ptr->color_type;
+ int bit_depth = info_ptr->bit_depth;
+ int channels = info_ptr->channels;
+ if (bit_depth != 8 || (channels != 3 && channels != 4) ||
+ (color_type != PNG_COLOR_TYPE_RGB &&
+ color_type != PNG_COLOR_TYPE_RGBA)) {
+ return -7;
+ goto exit;
+ }
+
surface = malloc(sizeof(GGLSurface) + pixelSize);
if (surface == NULL) {
- result = -7;
+ result = -8;
goto exit;
}
unsigned char* pData = (unsigned char*) (surface + 1);
@@ -128,63 +115,43 @@ int res_create_surface(const char* name, gr_surface* pSurface) {
surface->height = height;
surface->stride = width; /* Yes, pixels, not bytes */
surface->data = pData;
- surface->format = (header.biBitCount == 24) ?
+ surface->format = (channels == 3) ?
GGL_PIXEL_FORMAT_RGBX_8888 : GGL_PIXEL_FORMAT_RGBA_8888;
- // Source pixel bytes are stored B G R {A}
-
- lseek(fd, header.bfOffBits, SEEK_SET);
- size_t y;
- if (header.biBitCount == 24) { // RGB
- size_t inputStride = (((3 * width + 3) >> 2) << 2);
- for (y = 0; y < height; y++) {
- unsigned char* pRow = pData + (height - (y + 1)) * stride;
- bytesRead = read(fd, pRow, inputStride);
- if (bytesRead != inputStride) {
- result = -8;
- goto exit;
- }
+ int y;
+ if (channels == 3) {
+ for (y = 0; y < height; ++y) {
+ unsigned char* pRow = pData + y * stride;
+ png_read_row(png_ptr, pRow, NULL);
+
int x;
for(x = width - 1; x >= 0; x--) {
int sx = x * 3;
int dx = x * 4;
- unsigned char b = pRow[sx];
+ unsigned char r = pRow[sx];
unsigned char g = pRow[sx + 1];
- unsigned char r = pRow[sx + 2];
+ unsigned char b = pRow[sx + 2];
unsigned char a = 0xff;
pRow[dx ] = r; // r
pRow[dx + 1] = g; // g
- pRow[dx + 2] = b; // b;
+ pRow[dx + 2] = b; // b
pRow[dx + 3] = a;
}
}
- } else { // RGBA
- for (y = 0; y < height; y++) {
- unsigned char* pRow = pData + (height - (y + 1)) * stride;
- bytesRead = read(fd, pRow, stride);
- if (bytesRead != stride) {
- result = -9;
- goto exit;
- }
- size_t x;
- for(x = 0; x < width; x++) {
- size_t xx = x * 4;
- unsigned char b = pRow[xx];
- unsigned char g = pRow[xx + 1];
- unsigned char r = pRow[xx + 2];
- unsigned char a = pRow[xx + 3];
- pRow[xx ] = r;
- pRow[xx + 1] = g;
- pRow[xx + 2] = b;
- pRow[xx + 3] = a;
- }
+ } else {
+ for (y = 0; y < height; ++y) {
+ unsigned char* pRow = pData + y * stride;
+ png_read_row(png_ptr, pRow, NULL);
}
}
+
*pSurface = (gr_surface) surface;
exit:
- if (fd >= 0) {
- close(fd);
+ png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
+
+ if (fp != NULL) {
+ fclose(fp);
}
if (result < 0) {
if (surface) {
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-18 04:01:58 +0100