1 files changed, 425 insertions, 0 deletions
diff --git a/beos/beos_bitmap.cpp b/beos/beos_bitmap.cpp
new file mode 100644
index 000000000..6f950394f
--- /dev/null
+++ b/beos/beos_bitmap.cpp
@@ -0,0 +1,425 @@
+/*
+ * Copyright 2004 James Bursa <bursa@users.sourceforge.net>
+ *
+ * This file is part of NetSurf, http://www.netsurf-browser.org/
+ *
+ * NetSurf is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * NetSurf is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/** \file
+ * Generic bitmap handling (BeOS implementation).
+ *
+ * This implements the interface given by desktop/bitmap.h using BBitmap.
+ */
+
+#include <stdbool.h>
+#include <assert.h>
+#include <string.h>
+#include <Bitmap.h>
+#include <GraphicsDefs.h>
+extern "C" {
+#include "content/content.h"
+#include "image/bitmap.h"
+#include "utils/log.h"
+}
+#include "beos/beos_bitmap.h"
+#include "beos/beos_scaffolding.h"
+
+struct bitmap {
+  BBitmap *primary;
+  BBitmap *shadow; // in NetSurf's ABGR order
+  BBitmap *pretile_x;
+  BBitmap *pretile_y;
+  BBitmap *pretile_xy;
+  bool opaque;
+};
+
+#define MIN_PRETILE_WIDTH 256
+#define MIN_PRETILE_HEIGHT 256
+
+#warning TODO: check rgba order
+#warning TODO: add correct locking (not strictly required)
+
+
+/** Convert to BeOS RGBA32_LITTLE (strictly BGRA) from NetSurf's favoured ABGR format.
+ * Copies the converted data elsewhere.  Operation is rotate left 8 bits.
+ *
+ * \param pixels	Array of 32-bit values, in the form of ABGR.  This will
+ *			be overwritten with new data in the form of BGRA.
+ * \param width		Width of the bitmap
+ * \param height	Height of the bitmap
+ * \param rowstride	Number of bytes to skip after each row (this
+ *			implementation requires this to be a multiple of 4.)
+ */
+#if 0
+static inline void nsbeos_abgr_to_bgra(void *src, void *dst, int width, int height,
+				size_t rowstride)
+{
+	u_int32_t *from = (u_int32_t *)src;
+	u_int32_t *to = (u_int32_t *)dst;
+
+	rowstride >>= 2;
+
+	for (int y = 0; y < height; y++) {
+		for (int x = 0; x < width; x++) {
+			u_int32_t e = from[x];
+			to[x] = (e >> 24) | (e << 8);
+		}
+		from += rowstride;
+		to += rowstride;
+	}
+}
+#endif
+static inline void nsbeos_rgba_to_bgra(void *src, void *dst, int width, int height,
+				size_t rowstride)
+{
+	struct abgr { uint8 a, b, g, r; };
+	struct rgba { uint8 r, g, b ,a; };
+	struct bgra { uint8 b, g, r, a; };
+	struct rgba *from = (struct rgba *)src;
+	struct bgra *to = (struct bgra *)dst;
+
+	rowstride >>= 2;
+
+	for (int y = 0; y < height; y++) {
+		for (int x = 0; x < width; x++) {
+			to[x].b = from[x].b;
+			to[x].g = from[x].g;
+			to[x].r = from[x].r;
+			to[x].a = from[x].a;
+			if (from[x].a == 0)
+				*(rgb_color *)&to[x] = B_TRANSPARENT_32_BIT;
+		}
+		from += rowstride;
+		to += rowstride;
+	}
+}
+
+
+/**
+ * Create a bitmap.
+ *
+ * \param  width   width of image in pixels
+ * \param  height  width of image in pixels
+ * \param  state   a flag word indicating the initial state
+ * \return an opaque struct bitmap, or NULL on memory exhaustion
+ */
+
+struct bitmap *bitmap_create(int width, int height, unsigned int state)
+{
+	struct bitmap *bmp = (struct bitmap *)malloc(sizeof(struct bitmap));
+	if (bmp == NULL)
+		return NULL;
+
+	BRect frame(0, 0, width - 1, height - 1);
+	//XXX: bytes per row ?
+	bmp->primary = new BBitmap(frame, 0, B_RGBA32);
+	bmp->shadow = new BBitmap(frame, 0, B_RGBA32);
+
+	bmp->pretile_x = bmp->pretile_y = bmp->pretile_xy = NULL;
+
+	bmp->opaque = false;
+
+#if 0 /* GTK */
+	bmp->primary = gdk_pixbuf_new(GDK_COLORSPACE_RGB, true, 8,
+				      width, height);
+
+	/* fill the pixbuf in with 100% transparent black, as the memory
+	 * won't have been cleared.
+	 */
+	gdk_pixbuf_fill(bmp->primary, 0);
+	bmp->pretile_x = bmp->pretile_y = bmp->pretile_xy = NULL;
+#endif
+	return bmp;
+}
+
+
+/**
+ * Sets whether a bitmap should be plotted opaque
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ * \param  opaque  whether the bitmap should be plotted opaque
+ */
+void bitmap_set_opaque(struct bitmap *bitmap, bool opaque)
+{
+	assert(bitmap);
+/* todo: set bitmap as opaque */
+	bitmap->opaque = true;
+}
+
+
+/**
+ * Tests whether a bitmap has an opaque alpha channel
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ * \return whether the bitmap is opaque
+ */
+bool bitmap_test_opaque(struct bitmap *bitmap)
+{
+	assert(bitmap);
+/* todo: test if bitmap as opaque */
+	return bitmap->opaque;
+}
+
+
+/**
+ * Gets whether a bitmap should be plotted opaque
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ */
+bool bitmap_get_opaque(struct bitmap *bitmap)
+{
+	assert(bitmap);
+/* todo: get whether bitmap is opaque */
+	return bitmap->opaque;
+}
+
+
+/**
+ * Return a pointer to the pixel data in a bitmap.
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ * \return pointer to the pixel buffer
+ *
+ * The pixel data is packed as BITMAP_FORMAT, possibly with padding at the end
+ * of rows. The width of a row in bytes is given by bitmap_get_rowstride().
+ */
+
+char *bitmap_get_buffer(struct bitmap *bitmap)
+{
+	assert(bitmap);
+	return (char *)(bitmap->shadow->Bits());
+}
+
+
+/**
+ * Find the width of a pixel row in bytes.
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ * \return width of a pixel row in the bitmap
+ */
+
+size_t bitmap_get_rowstride(struct bitmap *bitmap)
+{
+	assert(bitmap);
+	return (bitmap->primary->BytesPerRow());
+}
+
+
+static void
+nsbeos_bitmap_free_pretiles(struct bitmap *bitmap)
+{
+#define FREE_TILE(XY) if (bitmap->pretile_##XY) delete (bitmap->pretile_##XY); bitmap->pretile_##XY = NULL
+	FREE_TILE(x);
+	FREE_TILE(y);
+	FREE_TILE(xy);
+#undef FREE_TILE
+}
+
+/**
+ * Free a bitmap.
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ */
+
+void bitmap_destroy(struct bitmap *bitmap)
+{
+	assert(bitmap);
+	nsbeos_bitmap_free_pretiles(bitmap);
+	delete bitmap->primary;
+	delete bitmap->shadow;
+	free(bitmap);
+}
+
+
+/**
+ * Save a bitmap in the platform's native format.
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ * \param  path    pathname for file
+ * \param  flags   modify the behaviour of the save
+ * \return true on success, false on error and error reported
+ */
+
+bool bitmap_save(struct bitmap *bitmap, const char *path, unsigned flags)
+{
+#warning WRITEME
+#if 0 /* GTK */
+	GError *err = NULL;
+
+	gdk_pixbuf_save(bitmap->primary, path, "png", &err, NULL);
+
+	if (err == NULL)
+		/* TODO: report an error here */
+		return false;
+
+#endif
+	return true;
+}
+
+
+/**
+ * The bitmap image has changed, so flush any persistant cache.
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ */
+void bitmap_modified(struct bitmap *bitmap) {
+	// convert the shadow (ABGR) to into the primary bitmap
+	nsbeos_rgba_to_bgra(bitmap->shadow->Bits(), bitmap->primary->Bits(), 
+		bitmap->primary->Bounds().Width() + 1, 
+		bitmap->primary->Bounds().Height() + 1, 
+		bitmap->primary->BytesPerRow());
+	nsbeos_bitmap_free_pretiles(bitmap);
+}
+
+
+/**
+ * The bitmap image can be suspended.
+ *
+ * \param  bitmap  	a bitmap, as returned by bitmap_create()
+ * \param  private_word	a private word to be returned later
+ * \param  suspend	the function to be called upon suspension
+ * \param  resume	the function to be called when resuming
+ */
+void bitmap_set_suspendable(struct bitmap *bitmap, void *private_word,
+		void (*invalidate)(struct bitmap *bitmap, void *private_word)) {
+}
+
+static BBitmap *
+nsbeos_bitmap_generate_pretile(BBitmap *primary, int repeat_x, int repeat_y)
+{
+	int width = primary->Bounds().Width() + 1;
+	int height = primary->Bounds().Height() + 1;
+	size_t primary_stride = primary->BytesPerRow();
+	BRect frame(0, 0, width * repeat_x - 1, height * repeat_y - 1);
+	BBitmap *result = new BBitmap(frame, 0, B_RGBA32);
+
+	char *target_buffer = (char *)result->Bits();
+	int x,y,row;
+	/* This algorithm won't work if the strides are not multiples */
+	assert((size_t)(result->BytesPerRow()) ==
+		(primary_stride * repeat_x));
+
+	if (repeat_x == 1 && repeat_y == 1) {
+		delete result;
+		// just return a copy
+		return new BBitmap(primary);
+	}
+
+	for (y = 0; y < repeat_y; ++y) {
+		char *primary_buffer = (char *)primary->Bits();
+		for (row = 0; row < height; ++row) {
+			for (x = 0; x < repeat_x; ++x) {
+				memcpy(target_buffer,
+				       primary_buffer, primary_stride);
+				target_buffer += primary_stride;
+			}
+			primary_buffer += primary_stride;
+		}
+	}
+	return result;
+
+#if 0 /* GTK */
+	BBitmap *result = gdk_pixbuf_new(GDK_COLORSPACE_RGB, true, 8,
+					   width * repeat_x, height * repeat_y);
+	char *target_buffer = (char *)gdk_pixbuf_get_pixels(result);
+	int x,y,row;
+	/* This algorithm won't work if the strides are not multiples */
+	assert((size_t)gdk_pixbuf_get_rowstride(result) ==
+		(primary_stride * repeat_x));
+
+	if (repeat_x == 1 && repeat_y == 1) {
+		g_object_ref(primary);
+		g_object_unref(result);
+		return primary;
+	}
+
+	for (y = 0; y < repeat_y; ++y) {
+		char *primary_buffer = (char *)gdk_pixbuf_get_pixels(primary);
+		for (row = 0; row < height; ++row) {
+			for (x = 0; x < repeat_x; ++x) {
+				memcpy(target_buffer,
+				       primary_buffer, primary_stride);
+				target_buffer += primary_stride;
+			}
+			primary_buffer += primary_stride;
+		}
+	}
+	return result;
+#endif
+}
+
+/**
+ * The primary image associated with this bitmap object.
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ */
+BBitmap *
+nsbeos_bitmap_get_primary(struct bitmap* bitmap)
+{
+  return bitmap->primary;
+}
+
+/**
+ * The X-pretiled image associated with this bitmap object.
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ */
+BBitmap *
+nsbeos_bitmap_get_pretile_x(struct bitmap* bitmap)
+{
+	if (!bitmap->pretile_x) {
+		int width = bitmap->primary->Bounds().Width() + 1;
+		int xmult = (MIN_PRETILE_WIDTH + width - 1)/width;
+		LOG(("Pretiling %p for X*%d", bitmap, xmult));
+		bitmap->pretile_x = nsbeos_bitmap_generate_pretile(bitmap->primary, xmult, 1);
+	}
+	return bitmap->pretile_x;
+
+}
+
+/**
+ * The Y-pretiled image associated with this bitmap object.
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ */
+BBitmap *
+nsbeos_bitmap_get_pretile_y(struct bitmap* bitmap)
+{
+	if (!bitmap->pretile_y) {
+		int height = bitmap->primary->Bounds().Height() + 1;
+		int ymult = (MIN_PRETILE_HEIGHT + height - 1)/height;
+		LOG(("Pretiling %p for Y*%d", bitmap, ymult));
+		bitmap->pretile_y = nsbeos_bitmap_generate_pretile(bitmap->primary, 1, ymult);
+	}
+  return bitmap->pretile_y;
+}
+
+/**
+ * The XY-pretiled image associated with this bitmap object.
+ *
+ * \param  bitmap  a bitmap, as returned by bitmap_create()
+ */
+BBitmap *
+nsbeos_bitmap_get_pretile_xy(struct bitmap* bitmap)
+{
+	if (!bitmap->pretile_xy) {
+		int width = bitmap->primary->Bounds().Width() + 1;
+		int height = bitmap->primary->Bounds().Height() + 1;
+		int xmult = (MIN_PRETILE_WIDTH + width - 1)/width;
+		int ymult = (MIN_PRETILE_HEIGHT + height - 1)/height;
+		LOG(("Pretiling %p for X*%d Y*%d", bitmap, xmult, ymult));
+		bitmap->pretile_xy = nsbeos_bitmap_generate_pretile(bitmap->primary, xmult, ymult);
+	}
+  return bitmap->pretile_xy;
+}